Defer Revit work and remove Dynamo scripts

Further Revit exchange will use the CSV export/import of the Linear
plugin instead of Dynamo, as preferred by the internal Revit/CAD
steering committee. Mark the Revit documentation as deferred and remove
the Dynamo diagnostic scripts, which stay reachable through the tag
archive/dynamo-vorueberlegungen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -6,4 +6,3 @@ dist/
 data/*.db
 data/backups/*.db
 .codex/*.log
-dynamo/output/

AGENTS.md

@@ -284,8 +284,16 @@ not change the project revision or undo/redo stacks. Restoring a server-stored
 snapshot verifies its checksum and the current-state hash, replaces supported
 project data atomically and records a new `restore` revision with a complete
 inverse command. Restore can therefore be undone and redone after a restart.
-Current snapshot schema version 5 additionally stores the manual quantity share
+Current snapshot schema version 7 additionally stores the project buildings
-of every CircuitDeviceRow. Version 4 snapshots are upgraded with
+and `floors[].buildingId` (see `docs/building-structure.md`); versions 1 to 6
+are upgraded with no buildings and `buildingId = null`. Version 6 stores the
+distribution-board info fields `boardNumber`, `location`, `fedFrom` and
+`remark` and the project cover fields `siteAddress`, `workStage`,
+`projectLead` and `projectEditor`; all older supported versions are upgraded
+with `null` for these fields.
+Stored named and automatic snapshots of every supported version (1 to 7)
+remain restorable; they are upgraded while parsing. Version 5 stores
+the manual quantity share of every CircuitDeviceRow. Version 4 snapshots are upgraded with
 `manualQuantity = quantity`; they already contain the complete confirmed
 external-model source, import batches, room mappings and objects. Version 3
 snapshots are upgraded with an empty external-model state; version 2 snapshots
@@ -299,7 +307,7 @@ project graph.
 Project-wide Revit CSV configuration uses
 `external-csv-configuration.update`. Its complete expected/target snapshot is
 persisted through the shared project-command transaction, so create, update,
-delete, Undo and Redo are revision-safe. Snapshot schema 5, restore and portable
+delete, Undo and Redo are revision-safe. Snapshot schema 5-7, restore and portable
 project duplication preserve the configuration; duplication remaps its internal
 id and project link.
 The project page exposes the Revit CSV modal. It edits the complete
@@ -313,7 +321,7 @@ immutable import batches with original bytes plus the classified cell matrix,
 normalized source-room mappings and external objects unique by
 `(sourceId, ifcGuid)`. Source values, planning values and overrides are separate.
 The general external-model repository is read-only; runtime writes belong only
-to typed command adapters. Snapshot/restore and portable project transfer schema version 5
+to typed command adapters. Snapshot/restore and portable project transfer schema version 5/6
 capture the complete external state and remap every internal UUID and link while
 preserving IFCGUIDs, source values, original bytes and the classified matrix.
 Import batches additionally store the monotonic project CSV configuration
@@ -402,6 +410,10 @@ Project settings use the persistent `project.update-settings` command. Project
 metadata, the public-building classification, both voltage defaults and the
 enabled distribution-board supply types change in one revision and Undo/Redo
 restores them together; the project PUT route requires `expectedRevision`.
+Schema version 3 additionally carries the print cover fields `siteAddress`,
+`workStage`, `projectLead` and `projectEditor` (migration `0008`); version 2
+(without them) and baseline version 1 stay executable and keep the current
+cover values. The PUT route accepts the cover fields optionally.
 The public-building flag is the future sizing input for requiring halogen-free
 cables and lines. The system catalog is `AV`, `SV`, `EV`,
 `USV`, `MSR`, `SiBe`; at least one must be enabled and a type used by a board
@@ -456,6 +468,18 @@ the only supported circuit-protection source; no flat compatibility fields remai
 Distribution-board floor assignment and a project-enabled supply type use
 `distribution-board.update`; both values are snapshot/export fields and one
 persistent undo step.
+The same command (still schema version 1, additively extended) carries the
+board info-card fields `boardNumber`, `location`, `fedFrom` and `remark`
+(migration `0007`). They are nullable, trimmed planner values; the PUT route
+only includes submitted info fields in the command and its inverse. An empty
+board with info values is no longer an unchanged setup, so history deletion of
+it is rejected like a changed simultaneity factor. Populated-subtree commands
+stored before these fields existed are normalized to `null` values
+(`normalizeDistributionBoardSubtreeSnapshot`). `fedFrom` is deliberately free
+text: the logical link to the feeding board/circuit is an open design decision.
+These fields are intended to be prefillable from Revit parameters later, but
+only through the Phase 14 rules (preview, explicit confirmation, no silent
+overwrite).
 Floor and room setup uses persistent insert, update and delete commands with
 complete stable snapshots. Their inverses remove or restore only unchanged records and
 reject floors with assigned rooms/distribution boards or rooms referenced by
@@ -477,8 +501,49 @@ Required operations:
 - synchronization changes
 
 
+## Print View (Seitenansicht)
+
+- Route `src/app/projects/[projectId]/print/page.tsx`, opened from the project
+  page button "Seitenansicht". Read-only: it only uses existing GET endpoints.
+- Pure read model `src/frontend/print/print-document-model.ts` (tested in
+  `tests/print-document-model.test.ts`); React sheets in
+  `src/frontend/print/print-document.tsx`; styles scoped to `.print-view` in
+  `src/frontend/print/print-document.css`.
+- Pages: cover (A4 portrait, tabular), board overview with structure and
+  power sums, one plan per board (A4/A3 landscape) whose title block sits in
+  `<thead>` so it repeats on printed pages. PDF export uses the browser print
+  dialog; page size, margins and "Seite x von y" come from injected named
+  `@page` rules (`lb-portrait`, `lb-landscape`).
+- The board hierarchy and "Σ inkl. unterlagert" in the overview are
+  PRELIMINARY (text match of `fedFrom` against board number/name, plain sum,
+  no upstream simultaneity factor). Replace this once the feed link is modeled.
+- Colors/fonts follow the kbp corporate design (`--pd-*` variables in
+  `print-document.css`). Empty cover values are shown as
+  "[ergänzen]"; the Planstände editor column shows the project's current
+  `projectEditor` because snapshots do not record an editor.
+- The document logo and the office profile (office name/address on the
+  cover) are global office branding: tables `document_branding_assets`
+  (migration `0007`) and `document_branding_settings` (migration `0008`),
+  endpoints `GET|PUT|DELETE /api/document-branding/logo`,
+  `PUT /api/document-branding/office` and `GET /api/document-branding`.
+  It is intentionally outside project revisions, snapshots and transfer.
+  Uploads are PNG/JPEG/SVG up to 2 MB with a content signature check; the logo
+  is served with `nosniff` and a restrictive CSP.
+
 ## Revit / CSV External Model Work
 
+Status: further Revit work (editor assignment UI, follow-up import, return
+export) is deferred and will be tackled later. When it resumes, the exchange
+stays CSV-based and uses the CSV export/import of the Linear plugin in Revit.
+The internal Revit/CAD steering committee prefers this over manipulating the
+model directly through Dynamo. Do not start Dynamo, Revit API or JSON
+transport work. The Linear CSV layout is not yet known: check a sample export
+against the existing project CSV configuration before changing the parser.
+Earlier Dynamo considerations are archived in
+`docs/archive/revit-dynamo-leistungsbilanz-integration-konzept.md`; the
+removed diagnostic scripts remain reachable through the git tag
+`archive/dynamo-vorueberlegungen`.
+
 When explicitly working on Phase 14, use
 `docs/spec/revit-csv-integration-requirements.md` as the detailed source of
 truth together with the current architecture documents.
@@ -567,11 +632,15 @@ Users must be able to override sizing suggestions.
 
 ## Current Deferred Work
 
-- Revit/CSV/IFCGUID round-trip, except when Phase 14 is explicitly requested and
+- Revit/CSV/IFCGUID round-trip (deferred; later via Linear plugin CSV, never
+  Dynamo), except when Phase 14 is explicitly requested and
   `docs/spec/revit-csv-integration-requirements.md` is being followed
 - full electrical sizing
 - multi-user/PostgreSQL operation
 - supported production deployment
+- logical feed link between distribution boards (`fedFrom` stays free text
+  until the project owner decides whether it references a board, a feeding
+  circuit or both) and the resulting hierarchical power summation
 
 Do not implement these while working on an unrelated phase.
 

README.md

@@ -9,7 +9,9 @@ Docker-Server-Stack mit gebautem Anwendungscode und ein separater
 Entwicklungsstack bereit. Ein vollständig unterstütztes Produktionsdeployment
 und Mehrbenutzerbetrieb fehlen weiterhin. Revit-CSV-Konfiguration, Vorschau
 und bestätigter Erstimport sind implementiert; die Editoroberfläche zur
-Objektzuordnung, Folgeimporte und Rückexport stehen noch aus.
+Objektzuordnung, Folgeimporte und Rückexport stehen noch aus. Die weitere
+Revit-Arbeit ist zurückgestellt und erfolgt später über den CSV-Export/-Import
+des Linear-Plugins in Revit.
 
 ## Unterstützter Arbeitsablauf
 
@@ -27,6 +29,8 @@ Objektzuordnung, Folgeimporte und Rückexport stehen noch aus.
 - Änderungen projektweit und auch nach einem Reload rückgängig machen und wiederholen
 - benannte Sicherungspunkte anlegen, wiederherstellen und Revisionen einsehen
 - automatische Sicherungspunkte mit begrenzter Aufbewahrung nutzen
+- Seitenansicht mit Deckblatt, Verteilerübersicht und Verteilerplänen öffnen
+  und über den Browser als PDF drucken; Büroangaben und Logo zentral pflegen
 - Revit-CSV-Dateien konfigurieren, prüfen und nach expliziter Zuordnung von
   Räumen, Verteilungen und Projektgeräten erstmals importieren; dabei entstehen
   noch keine Stromkreise oder Gerätezeilen
@@ -147,6 +151,7 @@ vor der Baseline werden nicht unterstützt.
 - [Aktuelle Architektur](docs/current-architecture.md)
 - [Editor-Interaktionen](docs/circuit-list-editor-interactions.md)
 - [API des Stromkreislisten-Editors](docs/circuit-list-editor-api.md)
+- [Seitenansicht und PDF-Export](docs/print-view.md)
 - [Entwicklungs- und Contributor-Workflow](docs/development-workflow.md)
 - [Bekannte Einschränkungen](docs/circuit-list-editor-known-limitations.md)
 - [Roadmap](docs/spec/07-implementation-phases-todo.md)

docs/README.md

@@ -12,6 +12,10 @@ ausdrücklich getrennt und dürfen nicht als bereits implementiert verstanden we
   fachliches Modell und Grid-Aufteilung
 - [Editor-Interaktionen](circuit-list-editor-interactions.md) – Tastatur,
   Drag-and-drop, Sortierung, Filterung und Undo/Redo
+- [Seitenansicht und PDF-Export](print-view.md) – Deckblatt,
+  Verteilerübersicht, Verteilerpläne, Büro-Logo
+- [Gebäudestruktur](building-structure.md) – Gebäude → Etagen → Räume,
+  Befehle, Snapshot-Schema 7, eigene Seite
 - [Editor-API](circuit-list-editor-api.md) – unterstützte Circuit-First-Endpunkte
 - [Bekannte Einschränkungen](circuit-list-editor-known-limitations.md) –
   bewusst noch nicht implementierte oder begrenzte Funktionen
@@ -25,7 +29,8 @@ ausdrücklich getrennt und dürfen nicht als bereits implementiert verstanden we
 
 - [Projektversionen und externer Modellaustausch](project-history-and-external-model-architecture.md)
 - [LLM-Kontext für die Revit-Anforderungsplanung](revit-requirements-llm-context.md)
-- [Revit-CSV-Anforderungen](spec/revit-csv-integration-requirements.md)
+- [Revit-CSV-Anforderungen](spec/revit-csv-integration-requirements.md) –
+  zurückgestellt; später über den CSV-Export/-Import des Linear-Plugins
 - [Phase-14-Audit und Implementierungsplan](spec/revit-csv-phase-14-audit-and-plan.md)
 - [Zukünftige Dimensionierung](spec/06-future-sizing-and-calculations.md)
 - [Roadmap und Phasen](spec/07-implementation-phases-todo.md)
@@ -48,3 +53,6 @@ Limitierungen und Roadmap.
 
 - [Frühe Codex-Promptvorlagen](archive/initial-codex-prompts.md) – historischer
   Arbeitsstand, keine aktuelle Implementierungsanweisung
+- [Revit-/Dynamo-Anbindung](archive/revit-dynamo-leistungsbilanz-integration-konzept.md) –
+  nicht weiterverfolgte Vorüberlegung zur direkten Dynamo-/API-Anbindung;
+  Diagnoseskripte über den Git-Tag `archive/dynamo-vorueberlegungen`

docs/building-structure.md

@@ -0,0 +1,81 @@
+# Gebäudestruktur (Gebäude → Etagen → Räume)
+
+Projekte mit mehreren Gebäuden werden über eine eigene Ebene **Gebäude**
+gegliedert. Etagen können einem Gebäude zugeordnet sein, Räume und Verteilungen
+hängen wie bisher an der Etage. Das Gebäude eines Raums oder einer Verteilung
+ergibt sich also aus der Etage; eine zweite, konkurrierende Zuordnung gibt es
+nicht. Abstimmung mit Julian: Issue #6.
+
+## Datenmodell
+
+| Tabelle | Feld | Bedeutung |
+|---|---|---|
+| `buildings` | `id`, `project_id` (FK, cascade), `name`, `sort_order` | Gebäude eines Projekts |
+| `floors` | `building_id` (nullable FK → `buildings`, `ON DELETE set null`) | optionales übergeordnetes Gebäude |
+
+Migration `0009_buildings`. Bestehende Etagen behalten `building_id = null` und
+erscheinen in der Oberfläche als „Ohne Gebäude“. Es gibt keine Zwangsmigration
+und kein automatisch angelegtes Standardgebäude. Vor dem Anwenden der Migration
+auf eine bestehende Datenbank ist wie bei jeder Schemamigration eine separate
+Datenbanksicherung anzulegen.
+
+## Befehle, Undo/Redo
+
+Alle Änderungen laufen über die bestehende Orts-Struktur
+(`ProjectLocationStructureProjectCommandRepository`) mit Revision, Inverse und
+persistentem Undo/Redo:
+
+- `project-building.insert` / `project-building.delete` mit vollständigem
+  Gebäude-Snapshot (Schema-Version 1)
+- `project-building.update`: ändert nur den Namen
+- Löschen eines Gebäudes wird abgelehnt, solange Etagen zugeordnet sind
+  („Das Gebäude kann nicht gelöscht werden, solange Etagen zugeordnet sind.“)
+- Etagenbefehle `project-floor.insert/.update/.delete` haben seit
+  Schema-Version **2** das Feld `buildingId`. `project-floor.update` darf Name
+  und/oder Gebäude ändern, nicht aber `sortOrder`. Ein referenziertes Gebäude
+  muss zum Projekt gehören.
+- Version-1-Etagenbefehle aus bestehender Historie bleiben ausführbar. Sie
+  stammen aus der Zeit vor den Gebäuden und werden vor der Ausführung mit
+  `buildingId = null` auf Version 2 gehoben; auch die daraus neu gespeicherten
+  Vorwärts- und Inversbefehle sind Version 2. Das ist bei linearer Historie
+  exakt: Wird ein Gebäude später zugeordnet, liegt dieser neuere Befehl im
+  Undo-Stapel vor dem alten Befehl und wird zuerst zurückgenommen.
+- Raumbefehle bleiben unverändert (Version 1).
+
+## Snapshots und Transfer
+
+Projekt-Snapshot-Schema **7** enthält `buildings` und `floors[].buildingId`.
+Alle älteren unterstützten Versionen (1–6) werden beim Einlesen mit leerer
+Gebäudeliste und `buildingId = null` hochgestuft; gespeicherte Sicherungspunkte
+bleiben wiederherstellbar. Die Relationen werden geprüft (Gebäude gehört zum
+Projekt, `buildingId` verweist auf ein Gebäude des Snapshots). Restore löscht
+und schreibt Gebäude zusammen mit den Etagen; der Projekt-Transfer vergibt neue
+Gebäude-IDs und stellt die Etagenverweise um.
+
+## API
+
+- `GET /api/projects/:projectId/buildings` – Gebäude sortiert nach
+  `sortOrder`, Name
+- `POST /api/projects/:projectId/buildings` – `{ "name": "Haus A", "expectedRevision": 3 }`
+- `PUT /api/projects/:projectId/buildings/:buildingId` – `{ "name": "Haus B", "expectedRevision": 4 }`
+- `DELETE /api/projects/:projectId/buildings/:buildingId` – `{ "expectedRevision": 5 }`
+- `POST/PUT /api/projects/:projectId/floors[/:floorId]` akzeptieren zusätzlich
+  optional `buildingId` (`string | null`). Fehlt das Feld, bleibt beim Bearbeiten
+  das bisherige Gebäude erhalten; ältere Clients funktionieren unverändert.
+
+## Oberfläche
+
+Gebäude, Etagen und Räume werden auf der eigenen Seite
+`/projects/:projectId/struktur` („Gebäudestruktur“) gepflegt, erreichbar über
+die Seitenleiste und die Kennzahlen der Projektübersicht. Drei Spalten
+Gebäude → Etagen → Räume filtern sich gegenseitig: Klick auf ein Gebäude zeigt
+nur dessen Etagen, Klick auf eine Etage nur deren Räume, „Alle“ hebt den Filter
+auf. Hinzufügen, Bearbeiten und Löschen laufen über Icon-Buttons wie in der
+Stromkreisliste.
+
+## Offen
+
+- Revit: Das Gebäude kann später aus einem Revit-Parameter kommen und über die
+  bestehende CSV-Zuordnung gemappt werden (Frage an Julian in Issue #6).
+- Sortierung von Gebäuden per Drag-and-drop ist noch nicht umgesetzt; neue
+  Gebäude werden hinten angehängt.

docs/circuit-list-editor-api.md

@@ -74,8 +74,9 @@ Protected-board structure uses
 persisted inverse of a delete. The dispatcher also supports the documented
 project-device, project settings, distribution-board and project-location
 commands. The generic editor commands listed here use schema version `1`.
-`project.update-settings` uses version `2` and still accepts supported baseline
+`project.update-settings` uses version `3` (including the print cover fields)
-version `1` commands without changing the newer building classification.
+and still accepts version `2` and supported baseline version `1` commands
+without changing the newer cover fields or building classification.
 Pre-baseline formats remain unsupported. Unsupported types or schema versions
 are rejected. Insert commands contain the complete entity or circuit block
 with stable ids; delete commands include the expected parent identity. Circuit
@@ -173,6 +174,9 @@ synchronizes linked circuit rows implicitly.
 - `PUT /projects/:projectId`
   - request:
     `{ "expectedRevision": 12, "isPublicBuilding": true, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
+  - optional print cover fields `siteAddress` (max. 500), `workStage` (max.
+    100), `projectLead` and `projectEditor` (max. 200 each); omitted fields keep
+    their value, empty strings are stored as `null`
   - executes `project.update-settings` as one atomic revision
   - response:
     `{ "project": { ... }, "revision": { ... }, "history": { ... } }`
@@ -230,9 +234,13 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
   - stale revisions return `409 PROJECT_REVISION_CONFLICT`
 - `PUT /projects/:projectId/distribution-boards/:distributionBoardId`
   - body:
-    `{ "floorId": null, "supplyType": "AV", "expectedRevision": 13 }`
+    `{ "floorId": null, "supplyType": "AV", "simultaneityFactor": 1, "expectedRevision": 13 }`
-  - executes `distribution-board.update`; floor and supply type are restored
+  - optional info-card fields: `boardNumber` (max. 50), `location`,
-    together by persistent Undo/Redo
+    `fedFrom` (max. 200 each) and `remark` (max. 2000); strings are trimmed
+    and an empty string is stored as `null`
+  - executes `distribution-board.update`; all submitted values, including the
+    submitted info fields, are restored together by persistent Undo/Redo
+  - `fedFrom` is free text until the logical feed link is modeled
 - `POST /projects/:projectId/distribution-boards/:distributionBoardId/copy`
   - body: `{ "name": "UV-02 Kopie", "expectedRevision": 14 }`
   - duplicates the complete distribution-board subtree with new owning UUIDs
@@ -249,15 +257,27 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
   `distribution-board.delete-subtree`. Persistent Undo/Redo restores or
   removes the same complete subtree, including protection devices.
 
-### Project Floors and Rooms
+### Project Buildings, Floors and Rooms
 
+- `GET /projects/:projectId/buildings`
+- `POST /projects/:projectId/buildings`
+  - body: `{ "name": "Haus A", "expectedRevision": 12 }`
+  - executes `project-building.insert` with a stable building id
+  - response: `{ "building": { ... }, "revision": { ... }, "history": { ... } }`
+- `PUT /projects/:projectId/buildings/:buildingId`
+  - body: `{ "name": "Haus B", "expectedRevision": 13 }` (name only)
+- `DELETE /projects/:projectId/buildings/:buildingId`
+  - body: `{ "expectedRevision": 14 }`
+  - rejects buildings with assigned floors
 - `POST /projects/:projectId/floors`
-  - body: `{ "name": "EG", "expectedRevision": 13 }`
+  - body: `{ "name": "EG", "buildingId": "building_1", "expectedRevision": 13 }`
-  - executes `project-floor.insert` with a stable floor id
+    (`buildingId` optional, `null` = no building)
+  - executes `project-floor.insert` (command version 2) with a stable floor id
   - response: `{ "floor": { ... }, "revision": { ... }, "history": { ... } }`
 - `PUT /projects/:projectId/floors/:floorId`
-  - body: `{ "name": "1. OG", "expectedRevision": 14 }`
+  - body: `{ "name": "1. OG", "buildingId": null, "expectedRevision": 14 }`
-  - executes an exact persistent floor update
+  - executes an exact persistent floor update of name and/or building; a
+    missing `buildingId` keeps the current building
 - `DELETE /projects/:projectId/floors/:floorId`
   - body: `{ "expectedRevision": 15 }`
   - rejects floors with assigned rooms or distribution boards
@@ -425,3 +445,27 @@ project device never triggers synchronization implicitly.
 Parser errors expose stable codes such as `header-not-found`,
 `ambiguous-header`, `invalid-ifc-guid` and `duplicate-ifc-guid`. The confirmed
 import uploads and parses the file again and verifies its hash.
+
+## Document Branding (print view)
+
+Office-wide branding for the print view. These endpoints are mounted at
+`/api/document-branding`, outside `/api/projects`, because the data is global
+and intentionally not part of project revisions, snapshots or transfer.
+
+- `GET /document-branding`
+  - returns `{ "logo": { "mimeType", "fileName", "sizeBytes", "updatedAtIso" } | null, "office": { "officeName", "officeAddress" } }`
+- `GET /document-branding/logo`
+  - returns the stored image bytes with its media type, or `404` without logo
+  - responses carry `X-Content-Type-Options: nosniff` and a restrictive
+    Content-Security-Policy so an SVG logo cannot execute scripts
+- `PUT /document-branding/logo`
+  - request: `{ "fileName": "logo.png", "mimeType": "image/png", "contentBase64": "..." }`
+  - accepted types: `image/png`, `image/jpeg`, `image/svg+xml`; at most 2 MB
+    after decoding; the content signature must match the declared type
+  - replaces an existing logo; returns the logo metadata
+- `DELETE /document-branding/logo`
+  - removes the logo; returns `204`
+- `PUT /document-branding/office`
+  - request: `{ "officeName": "…" | null, "officeAddress": "…" | null }`
+    (at most 200 / 500 characters; empty text is stored as not set)
+  - returns `{ "office": { "officeName", "officeAddress" } }`

docs/circuit-list-editor-known-limitations.md

@@ -9,6 +9,8 @@
 - Named and automatic logical project snapshots can be listed and restored
   through the project page with persistent Undo/Redo. Automatic snapshots are
   created every 25 revisions and only their newest 12 entries are retained.
+- Further Revit work is deferred; it will later use the CSV export/import of
+  the Linear plugin in Revit, not Dynamo.
 - The Revit/CSV foundation and confirmed initial import are implemented.
   Existing-row assignment, move and detach plus creation of an external-only
   row in an existing or newly created circuit have atomic persistent commands.
@@ -27,3 +29,12 @@
 - Protection and cable values are planner-owned manual selections. The later
   sizing/warning engine does not yet validate them against load, length or
   voltage-drop rules.
+- Distribution-board `fedFrom` is free text. The print overview derives its
+  supply structure and "Σ inkl. unterlagert" only from exact text matches with
+  board numbers/names and adds values without an upstream simultaneity factor
+  (see `docs/print-view.md`).
+- The print view uses a kbp corporate design derived from logo and
+  presentation material. Snapshots do not record an editor, so the cover's
+  Planstände list shows the project's current editor for every entry. On screen, long
+  board plans are not split into pages; pagination happens in the browser print
+  dialog.

docs/current-architecture.md

@@ -241,8 +241,9 @@ und Historienstapel teilen dieselbe Transaktion. Create, Import aus der globalen
 Gerätebibliothek und Delete laufen über dieselbe Command-Grenze; ihre Antworten
 liefern Gerät und aktualisierten Historienstand an die Projektseite zurück.
 `project.update-settings` versioniert Projektname, interne und externe
-Projektnummer, Bauherr, Beschreibung, die Kennzeichnung als öffentliches
+Projektnummer, Bauherr, Beschreibung, die Deckblattangaben (Anschrift,
-Gebäude, beide Standardspannungen sowie die im Projekt freigeschalteten
+Leistungsphase, Projektleitung, Bearbeitung; Schema-Version 3, Migration
+`0008`), die Kennzeichnung als öffentliches Gebäude, beide Standardspannungen sowie die im Projekt freigeschalteten
 Verteiler-Netzarten als eine atomare Änderung. Die Gebäudekennzeichnung ist
 der spätere Eingang für die Auswahl halogenfreier Kabel und Leitungen. Der
 Systemkatalog besteht aus `AV`, `SV`, `EV`, `USV`, `MSR` und `SiBe`; mindestens
@@ -254,9 +255,11 @@ Werte, Revision und Historienstapel gemeinsam. `PUT /api/projects/:projectId`
 verlangt deshalb `expectedRevision`, liefert Projekt plus aktualisierten
 Historienstand und besitzt keinen separaten direkten Settings-Schreibweg mehr.
 Kommando- und Snapshot-Payloads müssen dem aktuellen Baseline-Schema entsprechen.
-Die Projektseite zeigt Verteilungen, Etagen und Räume als kompakte
+Die Projektseite zeigt Verteilungen als kompakte Bestandsübersicht; ihre
-Bestandsübersichten; ihre versionierten Erstellwege öffnen beschriftete Modals
+versionierten Erstellwege öffnen beschriftete Modals statt dauerhafter
-statt dauerhafter Eingabezeilen. Projektgeräte werden als durchsuchbare,
+Eingabezeilen. Gebäude, Etagen und Räume werden auf der eigenen Seite
+„Gebäudestruktur“ (`/projects/:projectId/struktur`) gepflegt; Etagen können
+einem Gebäude zugeordnet sein (`docs/building-structure.md`). Projektgeräte werden als durchsuchbare,
 fünfspaltige Übersicht dargestellt. Manuelle Anlage, Übernahme aus der globalen
 Bibliothek und vollständige Bearbeitung erfolgen in einem gemeinsamen Modal.
 Die anschließende Vorschau verknüpfter Stromkreiszeilen bleibt davon getrennt,
@@ -271,7 +274,8 @@ Die allgemeinen Anwendungskarten verwenden in `src/app/globals.css` einen
 gleichmäßigen Rahmen, 16-px-Rundungen und einen Schatten mit eigener
 Dark-Mode-Abstimmung. Bootstrap-Karten mit `shadow-sm` nutzen denselben
 Schatten; der Stromkreis-Grid bleibt eine eigenständige Komponente.
-Die Verteilersuche berücksichtigt aktuell Name und Etagenname; die Gerätesuche
+Die Verteilersuche berücksichtigt Name, Verteilernummer, Örtlichkeit und
+Etagenname; die Gerätesuche
 Name, Anzeigename, Kategorie einschließlich deutscher Bezeichnung, Anschlussart
 und Kostengruppe. Der Gerätefilter „Anschluss“ wählt zwischen 1- und 3-phasig.
 Mehrere Werte innerhalb eines Filters gelten alternativ, verschiedene Filter
@@ -450,7 +454,16 @@ wieder her.
 verteilerweiten Gleichzeitigkeitsfaktor gemeinsam und stellt alle Werte über
 dauerhaftes Undo/Redo wieder her. Der Faktor liegt zwischen `0` und `1` und
 ist für bestehende sowie neu angelegte Verteilungen standardmäßig `1`.
-Snapshot-Schema 5 enthält zusätzlich den manuellen Mengenanteil jeder
+Derselbe Befehl versioniert die Felder der Verteiler-Infokarte
+(`boardNumber`, `location`, `fedFrom`, `remark`, Migration `0007`). Die
+Infokarte liegt im Bearbeiten-Dialog der Verteilung; die Werte sind lokale
+Planungswerte und sollen später über den Revit-Abgleich nur nach Vorschau und
+ausdrücklicher Bestätigung vorbelegt werden. `fedFrom` ist vorerst Freitext.
+Snapshot-Schema 7 enthält zusätzlich die Gebäude und die Gebäudezuordnung
+der Etagen; ältere Versionen werden ohne Gebäude hochgestuft.
+Snapshot-Schema 6 enthält diese Felder und die Deckblattangaben des
+Projekts; ältere Versionen werden mit `null`
+hochgestuft. Snapshot-Schema 5 enthält zusätzlich den manuellen Mengenanteil jeder
 Gerätezeile. Version 4 wird mit `manualQuantity = quantity` hochgestuft und
 enthält bereits den vollständigen externen Modellzustand
 aus Quelle, Batches, Raum-Mappings und Objekten. Es enthält außerdem die
@@ -520,7 +533,7 @@ Kopieren in ein Projekt erzeugt ein eigenständiges Projektgerät.
   `toLowerCase()` gegen das vollständige Register der Stromkreisliste und wird
   von jedem Anlage-/Umbenennungspfad für Stromkreise und Verteilerkomponenten
   aufgerufen, auch dort, wo zuvor kein Vorab-Check existierte. Snapshot- und
-  Transfer-Integration verwenden aktuell Snapshot-Schema 5. Persistente
+  Transfer-Integration verwenden aktuell Snapshot-Schema 6. Persistente
   Insert/Delete/Update-Commands für veränderliche Verteilerkomponenten,
   Gruppen einschließlich befüllter Unterbäume sowie vollständige
   Gruppensortierung sind integriert. Der Editor zeigt die geschützte Struktur
@@ -539,6 +552,10 @@ bei einem späteren Wechsel trotzdem einen eigenen PostgreSQL-Adapter.
 
 ## Revit-CSV-Grundlage
 
+**Zurückgestellt:** Die weitere Revit-Arbeit wird später angegangen, dann
+über den CSV-Export/-Import des Linear-Plugins in Revit statt über Dynamo.
+Details: [Revit-CSV-Anforderungen, Abschnitt 1](spec/revit-csv-integration-requirements.md).
+
 Der reine Adapter unter `src/external-model/csv` validiert die projektweite
 Transport- und Mappingkonfiguration und parst UTF-8-CSV verlustarm in eine
 klassifizierte Zellmatrix. Er erkennt Metadaten, Header, Passthrough-, Objekt-
@@ -548,7 +565,7 @@ einschließlich BOM, CRLF und Quotierung bytegleich zurück. Der lokale Befehl
 
 `external_csv_configurations` enthält höchstens eine versionierte Konfiguration
 je Projekt. `external-csv-configuration.update` schreibt Anlage, Änderung oder
-Entfernung zusammen mit Revision und persistentem Undo/Redo. Snapshot-Schema 5,
+Entfernung zusammen mit Revision und persistentem Undo/Redo. Snapshot-Schema 6,
 Restore und portabler Projekttransfer enthalten diesen Zustand; beim Duplizieren
 werden Konfigurations-UUID und Projektlink remapped.
 

docs/print-view.md

@@ -0,0 +1,127 @@
+# Seitenansicht und PDF-Export
+
+Die Seitenansicht ist rein lesend und verändert keine Projektdaten.
+Die Aktionen für Büroangaben und Logo speichern dagegen globale Einstellungen.
+Projekt- und Verteilerangaben werden in den jeweiligen Bearbeitungsdialogen
+über Projektbefehle mit Undo/Redo gepflegt.
+
+Beim Laden werden die Projektrevisionen aller Stromkreislisten und ein
+abschließend erneut gelesener Projektstand verglichen. Ändert sich das Projekt
+währenddessen, wird statt eines gemischten Datenstands eine Aufforderung zum
+Neuladen angezeigt. Eine bereits geladene Seitenansicht aktualisiert sich nicht
+automatisch bei späteren Änderungen in einem anderen Tab.
+
+## Aufruf
+
+- Projektseite → Button **Seitenansicht** öffnet
+  `/projects/:projectId/print` in einem neuen Tab.
+- **Als PDF speichern / Drucken** nutzt den Druckdialog des Browsers
+  (Ziel „Als PDF speichern“). Der Dokumenttitel `Leistungsbilanz – <Projekt>`
+  wird als Dateiname vorgeschlagen.
+- **Planformat** schaltet die Verteilerpläne zwischen A4 quer und A3 quer um.
+  Deckblatt bleibt A4 hoch.
+- **Büroangaben** pflegt Büroname und Büroanschrift (Planverfasser, für alle
+  Projekte).
+- **Logo hinterlegen / ersetzen / entfernen** verwaltet das Büro-Logo.
+
+## Seiten
+
+1. **Deckblatt (A4 hoch)** – tabellarisch: Projekt, Planverfasser, Dokument,
+   Planstände (aus benannten Sicherungspunkten) und Inhalt. Leere Angaben
+   erscheinen als orangefarbenes „[ergänzen]“.
+2. **Verteilerübersicht (quer)** – Versorgungsstruktur und Tabelle je
+   Verteiler mit Stromkreisanzahl, P<sub>inst</sub> (Anzahl × Leistung je
+   Stück), P<sub>Geräte</sub> (mit Geräte-GZF), Verteiler-GZF,
+   P<sub>gl</sub>, I<sub>B</sub> und „Σ inkl. unterlagert“.
+3. **Verteilerpläne (quer, je Verteiler)** – Titelleiste mit
+   Verteilernummer, Bezeichnung, Örtlichkeit, Netzart, „Gespeist von“ und
+   P<sub>gl</sub>; darunter Kopfkomponenten, Gruppen, Stromkreise
+   (mehrzeilige mit Sammelzeile und eingerückten Gerätezeilen),
+   Gruppensummen und Verteilersumme. Fehlende Kabelangaben sind als „offen“
+   markiert. Die Titelleiste steht im Tabellenkopf und wiederholt sich beim
+   Drucken auf Folgeseiten.
+
+Seitenformat, Ränder und „Seite x von y“ kommen beim Drucken aus benannten
+`@page`-Regeln (`lb-portrait`, `lb-landscape`), die die Seite zur Laufzeit
+einfügt. Die Bildschirmansicht zeigt Blätter in Papiergröße; die exakte
+Seitenaufteilung langer Verteilerpläne entsteht erst beim Drucken.
+
+## Vorläufige Punkte
+
+- **Einspeisung / Hierarchie:** `fedFrom` ist Freitext. Die Übersicht ordnet
+  einen Verteiler nur dann unter, wenn der Text eindeutig der Nummer oder
+  Bezeichnung eines anderen Verteilers entspricht (ohne Beachtung von
+  Groß-/Kleinschreibung und äußeren Leerzeichen). Mehrdeutige Treffer bleiben
+  ohne Zuordnung; „Σ inkl. unterlagert“ ist
+  eine einfache Summe ohne übergeordneten GZF. Die fachliche Verknüpfung
+  (Verteiler und/oder speisender Stromkreis) und die Summierungslogik sind
+  offen.
+- **I<sub>B</sub>** ist ein symmetrischer Drehstromwert
+  S / (√3 · U<sub>3~</sub>) mit S aus P / cos φ je Gerätezeile
+  (fehlendes cos φ = 1) und Verteiler-GZF.
+- **Corporate Design:** Farben (`--pd-*` in
+  `src/frontend/print/print-document.css`) und Schrift (Arial) sind aus Logo
+  und kbp-Präsentationsmaterial abgeleitet und werden durch die offizielle
+  CD-Vorgabe ersetzt, falls diese abweicht.
+- **Planstände:** Die Spalte „Bearbeitung“ zeigt für jeden Planstand die
+  aktuelle Bearbeitung aus den Projekteinstellungen, weil Sicherungspunkte
+  (noch) keinen Bearbeiter speichern.
+
+## Datenquellen des Deckblatts
+
+| Feld | Quelle |
+|---|---|
+| Bauvorhaben, Bauherr, Projektnummern, Beschreibung | Projekteinstellungen |
+| Anschrift Bauvorhaben, Leistungsphase, Projektleitung, Bearbeitung | Projekteinstellungen → Abschnitt „Deckblatt“ (`siteAddress`, `workStage`, `projectLead`, `projectEditor`) |
+| Büro, Anschrift Büro | Seitenansicht → „Büroangaben“ (global) |
+| Stand, Datenstand, Anzahl Verteiler, Inhalt | automatisch |
+| Planstände | benannte Sicherungspunkte |
+
+Die vier Projektfelder laufen über `project.update-settings` (Schema-Version
+3, Migration `0008`) und sind Teil von Snapshot-Schema 6 und Projektexport.
+Im `PUT /api/projects/:projectId` sind sie optional; fehlende Felder behalten
+ihren Wert.
+
+## Büroangaben
+
+- Tabelle `document_branding_settings` (Schlüssel/Wert, Migration `0008`),
+  global wie das Logo.
+- `GET /api/document-branding` liefert zusätzlich
+  `office: { officeName, officeAddress }`.
+- `PUT /api/document-branding/office` mit `{ "officeName", "officeAddress" }`
+  (max. 200 / 500 Zeichen, leerer Text = nicht gesetzt).
+
+## Logo
+
+- Globale Büro-Einstellung, nicht Teil von Projekten, Revisionen, Snapshots
+  oder Projektexport.
+- Tabelle `document_branding_assets` (Migration `0007`).
+- `GET /api/document-branding` → `{ logo: { mimeType, fileName, sizeBytes, updatedAtIso } | null }`
+- `GET /api/document-branding/logo` → Bilddaten (`404` ohne Logo), mit
+  `X-Content-Type-Options: nosniff` und restriktiver CSP.
+- `PUT /api/document-branding/logo` mit
+  `{ "fileName", "mimeType": "image/png" | "image/jpeg" | "image/svg+xml", "contentBase64" }`,
+  maximal 2 MB; der Dateiinhalt wird gegen das Format geprüft.
+- `DELETE /api/document-branding/logo` → `204`.
+
+## Code
+
+- `src/app/projects/[projectId]/print/page.tsx` – Datenladen, Werkzeugleiste,
+  `@page`-Regeln
+- `src/frontend/print/print-document-model.ts` – reine Berechnungen und
+  Formatierung (Tests: `tests/print-document-model.test.ts`)
+- `src/frontend/print/print-document.tsx` – Blätter und Tabellen
+- `src/frontend/print/print-document.css` – Layout, auf `.print-view`
+  begrenzt
+- `src/frontend/components/distribution-board-info-card.tsx` – Infokarte im
+  Bearbeiten-Dialog der Verteilung
+
+## Bestehende Datenbanken
+
+Vor dem Anwenden der additiven Migrationen `0007` und `0008` eine verifizierte
+Datenbanksicherung mit `npm run db:backup` erstellen. Die neuen Projekt- und
+Verteilerfelder bleiben bei bestehenden Datensätzen zunächst leer (`null`).
+Snapshot-Schema 6 enthält beide Feldgruppen; die unterstützten Versionen 1–5
+werden beim Lesen hochgestuft. Restore und Projektkopie erhalten die neuen
+Angaben. Globale Büroangaben und Logo gehören zur Datenbanksicherung, nicht
+zum logischen Projektsnapshot oder Projekttransfer.

docs/project-history-and-external-model-architecture.md

@@ -113,6 +113,10 @@ Implemented automatic-snapshot policy:
 
 ## Revit / CSV / IFCGUID Round-Trip Direction
 
+**Deferred:** further Revit work will be tackled later, then through the
+CSV export/import of the Linear plugin in Revit instead of Dynamo. Details:
+[Revit-CSV requirements, section 1](spec/revit-csv-integration-requirements.md).
+
 External model exchange should use explicit staging and link entities instead of writing imported rows directly into circuits.
 
 Conceptual entities:
@@ -275,6 +279,10 @@ Completed foundation:
 - `project-floor.insert` and `project-room.insert` persist complete location
   records with stable ids; their inverses reject changed or referenced records
   so Undo never clears room assignments or device-row links implicitly
+- `project-building.insert/.update/.delete` persist complete building records;
+  deleting a building with assigned floors is rejected. Floor commands carry
+  `buildingId` since command version 2; version 1 floor commands from older
+  history are upgraded with `buildingId = null` before execution
 - the floor and room POST routes require the current expected revision and the
   project page tracks the returned history state
 

docs/revit-requirements-llm-context.md

@@ -1,5 +1,9 @@
 # Kontext für die Revit-Anforderungsplanung
 
+**Zurückgestellt:** Die weitere Revit-Arbeit wird später angegangen, dann
+über den CSV-Export/-Import des Linear-Plugins in Revit statt über Dynamo.
+Details: [Revit-CSV-Anforderungen, Abschnitt 1](spec/revit-csv-integration-requirements.md).
+
 ## Zweck dieser Datei
 
 Diese Datei ist eine kompakte Übergabe an ein anderes LLM. Sie soll dabei

docs/spec/07-implementation-phases-todo.md

@@ -532,6 +532,10 @@ Acceptance criteria:
 
 ## Phase 14: External Model Round-Trip
 
+**Zurückgestellt:** Die weitere Revit-Arbeit wird später angegangen, dann
+über den CSV-Export/-Import des Linear-Plugins in Revit statt über Dynamo.
+Details: [Revit-CSV-Anforderungen, Abschnitt 1](revit-csv-integration-requirements.md).
+
 Status: Phase 14.2 (persistente externe Objekte und bestätigter Erstimport) ist
 implementiert. Editor-Zuordnung, Rückexport und Folgeimport folgen. Siehe
 [Phase-14-Audit und Implementierungsplan](revit-csv-phase-14-audit-and-plan.md)
@@ -540,7 +544,7 @@ und die verbindlichen
 
 Goal:
 
-Exchange model objects and planning parameters with Revit or comparable tools through CSV or another agreed format.
+Exchange model objects and planning parameters with Revit through CSV (Linear plugin export/import).
 
 Tasks:
 

docs/spec/08-current-product-backlog.md

@@ -141,4 +141,5 @@ The pre-release cleanup established the following compatibility boundary:
 
 The Revit/CSV/IFCGUID round-trip follows the distribution-board component
 foundation as a separate jointly planned phase and must not be inferred from
-these tasks.
+these tasks. It is currently deferred and will later use the CSV
+export/import of the Linear plugin in Revit, not Dynamo.

docs/spec/revit-csv-integration-requirements.md

@@ -2,6 +2,19 @@
 
 ## 1. Status und Verbindlichkeit
 
+> **Zurückgestellt (September 2026).** Die weitere Revit-Arbeit
+> (Editor-Oberfläche zur Objektzuordnung, Folgeimport, Rückexport) wird später
+> angegangen. Wenn sie wieder aufgenommen wird, bleibt der Austausch
+> CSV-basiert: Export und Import laufen über das Linear-Plugin in Revit. Das
+> entspricht der Vorgabe des internen Revit/CAD-Lenkungskreises, weil dabei
+> nicht direkt per Dynamo im Modell gearbeitet wird. Eine Dynamo- oder
+> API-Anbindung ist nicht vorgesehen; die früheren Vorüberlegungen liegen unter
+> [docs/archive](../archive/revit-dynamo-leistungsbilanz-integration-konzept.md).
+> Der Aufbau der Linear-CSV ist noch offen. Vor der Wiederaufnahme wird ein
+> Musterexport gegen die bestehende projektweite CSV-Konfiguration und den
+> Parser geprüft; erst danach wird entschieden, was anzupassen ist. Die bereits
+> umgesetzten Schritte bleiben unverändert nutzbar.
+
 Dieses Dokument ist die verbindliche fachliche und technische Arbeitsgrundlage für **Phase 14: External Model Round-Trip**.
 
 Es unterscheidet ausdrücklich zwischen:
@@ -1338,7 +1351,7 @@ Diese Punkte blockieren die Erstellung dieser Spezifikation nicht.
 - automatische raumbezogene Stromkreisvorschläge;
 - projektübergreifend wiederverwendbare Mappingprofile;
 - Teilmodelle und mehrere externe Quellen;
-- Dynamo/API/JSON-Transportadapter;
+- Dynamo/API/JSON-Transportadapter (nicht vorgesehen, siehe Abschnitt 1);
 - Rollen und Berechtigungen;
 - Hintergrundjobs;
 - PostgreSQL.

docs/spec/revit-csv-phase-14-audit-and-plan.md

@@ -2,6 +2,10 @@
 
 ## Status
 
+**Zurückgestellt:** Die weitere Revit-Arbeit wird später angegangen, dann
+über den CSV-Export/-Import des Linear-Plugins in Revit statt über Dynamo.
+Details: [Revit-CSV-Anforderungen, Abschnitt 1](revit-csv-integration-requirements.md).
+
 Phase 14.0 ist abgeschlossen und freigegeben. Dieses Dokument beschreibt den
 gegen den aktuellen Code geprüften Zielzuschnitt. Phase 14.1 ist abgeschlossen.
 Phase 14.2 hat mit den externen Domänenverträgen, Identitätsregeln und dem

dynamo/01_check_model_identity.py

@@ -1,385 +0,0 @@
-"""Read-only Revit 2026 model-identity diagnostics for a Dynamo Python node.
-
-Optional Dynamo input:
-    IN[0]: output directory or complete .json file path
-
-The script intentionally performs no Revit transaction and changes no model
-data. OUT contains a compact summary plus the complete report.
-"""
-
-import datetime
-import json
-import os
-import platform
-import sys
-import tempfile
-import traceback
-
-import clr
-
-clr.AddReference("RevitAPI")
-clr.AddReference("RevitServices")
-
-from Autodesk.Revit.DB import ModelPathUtils, StorageType  # noqa: E402
-from RevitServices.Persistence import DocumentManager  # noqa: E402
-
-
-CHECKED_PARAMETER_NAMES = ("LB_ModelId", "LB_ProjectId")
-
-
-def safe_text(value):
-    if value is None:
-        return None
-    try:
-        return str(value)
-    except Exception:
-        return None
-
-
-def element_id_text(element_id):
-    if element_id is None:
-        return None
-    try:
-        return str(element_id.Value)
-    except Exception:
-        try:
-            return str(element_id.IntegerValue)
-        except Exception:
-            return safe_text(element_id)
-
-
-def forge_type_id_text(value):
-    if value is None:
-        return None
-    try:
-        return value.TypeId
-    except Exception:
-        return safe_text(value)
-
-
-def parameter_value(parameter):
-    result = {
-        "hasValue": False,
-        "raw": None,
-        "display": None,
-    }
-    try:
-        result["hasValue"] = bool(parameter.HasValue)
-    except Exception:
-        pass
-
-    try:
-        storage_type = parameter.StorageType
-        if storage_type == StorageType.String:
-            result["raw"] = parameter.AsString()
-        elif storage_type == StorageType.Integer:
-            result["raw"] = int(parameter.AsInteger())
-        elif storage_type == StorageType.Double:
-            result["raw"] = float(parameter.AsDouble())
-        elif storage_type == StorageType.ElementId:
-            result["raw"] = element_id_text(parameter.AsElementId())
-    except Exception as error:
-        result["readError"] = safe_text(error)
-
-    try:
-        result["display"] = parameter.AsValueString()
-    except Exception:
-        pass
-    return result
-
-
-def describe_parameter(parameter):
-    definition = None
-    try:
-        definition = parameter.Definition
-    except Exception:
-        pass
-
-    name = None
-    if definition is not None:
-        try:
-            name = definition.Name
-        except Exception:
-            pass
-
-    is_shared = False
-    try:
-        is_shared = bool(parameter.IsShared)
-    except Exception:
-        pass
-
-    shared_guid = None
-    if is_shared:
-        try:
-            shared_guid = str(parameter.GUID)
-        except Exception:
-            pass
-
-    data_type = None
-    group_type = None
-    if definition is not None:
-        try:
-            data_type = forge_type_id_text(definition.GetDataType())
-        except Exception:
-            pass
-        try:
-            group_type = forge_type_id_text(definition.GetGroupTypeId())
-        except Exception:
-            pass
-
-    unit_type = None
-    try:
-        unit_type = forge_type_id_text(parameter.GetUnitTypeId())
-    except Exception:
-        pass
-
-    try:
-        storage_type = str(parameter.StorageType)
-    except Exception:
-        storage_type = None
-
-    try:
-        is_read_only = bool(parameter.IsReadOnly)
-    except Exception:
-        is_read_only = None
-
-    try:
-        user_modifiable = bool(parameter.UserModifiable)
-    except Exception:
-        user_modifiable = None
-
-    return {
-        "name": name,
-        "parameterId": element_id_text(getattr(parameter, "Id", None)),
-        "isShared": is_shared,
-        "sharedGuid": shared_guid,
-        "storageType": storage_type,
-        "dataTypeId": data_type,
-        "groupTypeId": group_type,
-        "unitTypeId": unit_type,
-        "isReadOnly": is_read_only,
-        "userModifiable": user_modifiable,
-        "value": parameter_value(parameter),
-    }
-
-
-def sorted_parameters(element):
-    parameters = []
-    try:
-        parameters = [describe_parameter(parameter) for parameter in element.Parameters]
-    except Exception:
-        return []
-    return sorted(
-        parameters,
-        key=lambda parameter: (
-            (parameter.get("name") or "").casefold(),
-            parameter.get("parameterId") or "",
-        ),
-    )
-
-
-def named_parameter_occurrences(element, parameter_name):
-    result = []
-    try:
-        parameters = element.GetParameters(parameter_name)
-        if parameters is not None:
-            result = [describe_parameter(parameter) for parameter in parameters]
-    except Exception:
-        parameter = None
-        try:
-            parameter = element.LookupParameter(parameter_name)
-        except Exception:
-            pass
-        if parameter is not None:
-            result = [describe_parameter(parameter)]
-    return result
-
-
-def loaded_assembly_versions():
-    result = {}
-    try:
-        from System import AppDomain
-
-        for assembly in AppDomain.CurrentDomain.GetAssemblies():
-            try:
-                name = assembly.GetName()
-                simple_name = str(name.Name)
-                if simple_name in (
-                    "DynamoCore",
-                    "DynamoCoreWpf",
-                    "DynamoRevitDS",
-                    "RevitAPI",
-                    "RevitServices",
-                ):
-                    result[simple_name] = str(name.Version)
-            except Exception:
-                continue
-    except Exception:
-        pass
-    return dict(sorted(result.items()))
-
-
-def get_cloud_identity(document):
-    result = {"isModelInCloud": False}
-    try:
-        result["isModelInCloud"] = bool(document.IsModelInCloud)
-    except Exception:
-        return result
-    if not result["isModelInCloud"]:
-        return result
-
-    try:
-        model_path = document.GetCloudModelPath()
-        result["userVisiblePath"] = ModelPathUtils.ConvertModelPathToUserVisiblePath(
-            model_path
-        )
-        for property_name, output_name in (
-            ("GetProjectGUID", "projectGuid"),
-            ("GetModelGUID", "modelGuid"),
-        ):
-            try:
-                result[output_name] = str(getattr(model_path, property_name)())
-            except Exception:
-                pass
-    except Exception as error:
-        result["readError"] = safe_text(error)
-    return result
-
-
-def get_worksharing_identity(document):
-    result = {"isWorkshared": False}
-    try:
-        result["isWorkshared"] = bool(document.IsWorkshared)
-    except Exception:
-        return result
-    if not result["isWorkshared"]:
-        return result
-
-    try:
-        model_path = document.GetWorksharingCentralModelPath()
-        result["centralModelPath"] = ModelPathUtils.ConvertModelPathToUserVisiblePath(
-            model_path
-        )
-    except Exception as error:
-        result["readError"] = safe_text(error)
-    return result
-
-
-def resolve_output_path(configured_path, report_name):
-    timestamp = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
-    default_directory = os.path.join(tempfile.gettempdir(), "leistungsbilanz-dynamo")
-    raw_path = safe_text(configured_path)
-    if raw_path is None or not raw_path.strip():
-        directory = default_directory
-        file_path = os.path.join(directory, report_name + "-" + timestamp + ".json")
-    else:
-        expanded = os.path.abspath(os.path.expandvars(os.path.expanduser(raw_path.strip())))
-        if expanded.lower().endswith(".json"):
-            file_path = expanded
-            directory = os.path.dirname(file_path)
-        else:
-            directory = expanded
-            file_path = os.path.join(directory, report_name + "-" + timestamp + ".json")
-    if not directory:
-        directory = os.getcwd()
-    if not os.path.isdir(directory):
-        os.makedirs(directory)
-    return file_path
-
-
-def write_json(file_path, payload):
-    temporary_path = file_path + ".tmp"
-    with open(temporary_path, "w", encoding="utf-8", newline="\n") as output:
-        json.dump(payload, output, ensure_ascii=False, indent=2, sort_keys=True)
-        output.write("\n")
-    os.replace(temporary_path, file_path)
-
-
-def get_input(index, default=None):
-    values = globals().get("IN", [])
-    try:
-        value = values[index]
-        return default if value is None else value
-    except Exception:
-        return default
-
-
-def build_report():
-    document = DocumentManager.Instance.CurrentDBDocument
-    if document is None:
-        raise RuntimeError("No active Revit document is available.")
-
-    project_information = document.ProjectInformation
-    if project_information is None:
-        raise RuntimeError("The active document has no Project Information element.")
-
-    application = document.Application
-    checked_parameters = {
-        name: named_parameter_occurrences(project_information, name)
-        for name in CHECKED_PARAMETER_NAMES
-    }
-    warnings = []
-    for name in CHECKED_PARAMETER_NAMES:
-        occurrences = checked_parameters[name]
-        populated = [
-            parameter
-            for parameter in occurrences
-            if parameter.get("value", {}).get("raw") not in (None, "")
-        ]
-        if not occurrences:
-            warnings.append(name + " is not bound to Project Information.")
-        elif not populated:
-            warnings.append(name + " exists but has no value on Project Information.")
-        elif len(occurrences) > 1:
-            warnings.append(name + " occurs more than once; use a shared-parameter GUID later.")
-
-    return {
-        "reportSchemaVersion": 1,
-        "generatedAt": datetime.datetime.now(datetime.timezone.utc).isoformat(),
-        "readOnly": True,
-        "environment": {
-            "revitVersionNumber": safe_text(getattr(application, "VersionNumber", None)),
-            "revitVersionName": safe_text(getattr(application, "VersionName", None)),
-            "revitSubVersionNumber": safe_text(
-                getattr(application, "SubVersionNumber", None)
-            ),
-            "pythonImplementation": safe_text(getattr(sys.implementation, "name", None)),
-            "pythonVersion": platform.python_version(),
-            "assemblies": loaded_assembly_versions(),
-        },
-        "document": {
-            "title": safe_text(document.Title),
-            "pathName": safe_text(document.PathName),
-            "isFamilyDocument": bool(document.IsFamilyDocument),
-            "cloud": get_cloud_identity(document),
-            "worksharing": get_worksharing_identity(document),
-        },
-        "modelIdentityCandidates": {
-            "projectInformationUniqueId": safe_text(project_information.UniqueId),
-            "projectInformationElementId": element_id_text(project_information.Id),
-            "checkedProjectParameters": checked_parameters,
-        },
-        "projectInformationParameters": sorted_parameters(project_information),
-        "warnings": warnings,
-    }
-
-
-try:
-    report = build_report()
-    output_path = resolve_output_path(get_input(0), "model-identity")
-    write_json(output_path, report)
-    OUT = {
-        "ok": True,
-        "filePath": output_path,
-        "projectInformationUniqueId": report["modelIdentityCandidates"][
-            "projectInformationUniqueId"
-        ],
-        "warnings": report["warnings"],
-        "report": report,
-    }
-except Exception as error:
-    OUT = {
-        "ok": False,
-        "error": safe_text(error),
-        "traceback": traceback.format_exc(),
-    }

dynamo/02_export_electrical_fixture_parameter_inventory.py

@@ -1,517 +0,0 @@
-"""Export all Electrical Fixtures instance/type parameters from Revit 2026.
-
-Optional Dynamo inputs:
-    IN[0]: output directory or complete .json file path
-    IN[1]: include empty parameters (default True)
-    IN[2]: maximum aggregated sample values (default 5)
-
-The script is read-only and performs no Revit transaction.
-"""
-
-import datetime
-import json
-import os
-import platform
-import sys
-import tempfile
-import traceback
-
-import clr
-
-clr.AddReference("RevitAPI")
-clr.AddReference("RevitServices")
-
-from Autodesk.Revit.DB import (  # noqa: E402
-    BuiltInCategory,
-    FilteredElementCollector,
-    ModelPathUtils,
-    StorageType,
-)
-from RevitServices.Persistence import DocumentManager  # noqa: E402
-
-
-def safe_text(value):
-    if value is None:
-        return None
-    try:
-        return str(value)
-    except Exception:
-        return None
-
-
-def element_id_text(element_id):
-    if element_id is None:
-        return None
-    try:
-        return str(element_id.Value)
-    except Exception:
-        try:
-            return str(element_id.IntegerValue)
-        except Exception:
-            return safe_text(element_id)
-
-
-def forge_type_id_text(value):
-    if value is None:
-        return None
-    try:
-        return value.TypeId
-    except Exception:
-        return safe_text(value)
-
-
-def parameter_value(parameter):
-    result = {"hasValue": False, "raw": None, "display": None}
-    try:
-        result["hasValue"] = bool(parameter.HasValue)
-    except Exception:
-        pass
-
-    try:
-        storage_type = parameter.StorageType
-        if storage_type == StorageType.String:
-            result["raw"] = parameter.AsString()
-        elif storage_type == StorageType.Integer:
-            result["raw"] = int(parameter.AsInteger())
-        elif storage_type == StorageType.Double:
-            result["raw"] = float(parameter.AsDouble())
-        elif storage_type == StorageType.ElementId:
-            result["raw"] = element_id_text(parameter.AsElementId())
-    except Exception as error:
-        result["readError"] = safe_text(error)
-
-    try:
-        result["display"] = parameter.AsValueString()
-    except Exception:
-        pass
-    return result
-
-
-def describe_parameter(parameter, scope):
-    definition = None
-    try:
-        definition = parameter.Definition
-    except Exception:
-        pass
-
-    name = None
-    data_type = None
-    group_type = None
-    if definition is not None:
-        try:
-            name = definition.Name
-        except Exception:
-            pass
-        try:
-            data_type = forge_type_id_text(definition.GetDataType())
-        except Exception:
-            pass
-        try:
-            group_type = forge_type_id_text(definition.GetGroupTypeId())
-        except Exception:
-            pass
-
-    is_shared = False
-    try:
-        is_shared = bool(parameter.IsShared)
-    except Exception:
-        pass
-
-    shared_guid = None
-    if is_shared:
-        try:
-            shared_guid = str(parameter.GUID)
-        except Exception:
-            pass
-
-    unit_type = None
-    try:
-        unit_type = forge_type_id_text(parameter.GetUnitTypeId())
-    except Exception:
-        pass
-
-    try:
-        storage_type = str(parameter.StorageType)
-    except Exception:
-        storage_type = None
-
-    try:
-        is_read_only = bool(parameter.IsReadOnly)
-    except Exception:
-        is_read_only = None
-
-    try:
-        user_modifiable = bool(parameter.UserModifiable)
-    except Exception:
-        user_modifiable = None
-
-    return {
-        "scope": scope,
-        "name": name,
-        "parameterId": element_id_text(getattr(parameter, "Id", None)),
-        "isShared": is_shared,
-        "sharedGuid": shared_guid,
-        "storageType": storage_type,
-        "dataTypeId": data_type,
-        "groupTypeId": group_type,
-        "unitTypeId": unit_type,
-        "isReadOnly": is_read_only,
-        "userModifiable": user_modifiable,
-        "value": parameter_value(parameter),
-    }
-
-
-def has_meaningful_value(parameter_description):
-    value = parameter_description.get("value", {})
-    return bool(value.get("hasValue")) or value.get("raw") not in (None, "") or value.get(
-        "display"
-    ) not in (None, "")
-
-
-def read_parameters(element, scope, include_empty):
-    result = []
-    try:
-        for parameter in element.Parameters:
-            description = describe_parameter(parameter, scope)
-            if include_empty or has_meaningful_value(description):
-                result.append(description)
-    except Exception as error:
-        return [], [safe_text(error)]
-    result.sort(
-        key=lambda parameter: (
-            (parameter.get("name") or "").casefold(),
-            parameter.get("parameterId") or "",
-        )
-    )
-    return result, []
-
-
-def read_space(element, document):
-    try:
-        space = element.Space
-    except Exception as error:
-        return None, safe_text(error)
-    if space is None:
-        return None, None
-
-    level_name = None
-    try:
-        level = document.GetElement(space.LevelId)
-        level_name = None if level is None else safe_text(level.Name)
-    except Exception:
-        pass
-
-    return {
-        "uniqueId": safe_text(space.UniqueId),
-        "elementId": element_id_text(space.Id),
-        "number": safe_text(getattr(space, "Number", None)),
-        "name": safe_text(getattr(space, "Name", None)),
-        "levelName": level_name,
-    }, None
-
-
-def read_family_identity(element, document):
-    symbol = None
-    try:
-        symbol = element.Symbol
-    except Exception:
-        try:
-            symbol = document.GetElement(element.GetTypeId())
-        except Exception:
-            pass
-
-    family_name = None
-    type_name = None
-    type_unique_id = None
-    type_element_id = None
-    if symbol is not None:
-        try:
-            family_name = safe_text(symbol.Family.Name)
-        except Exception:
-            family_name = safe_text(getattr(symbol, "FamilyName", None))
-        type_name = safe_text(getattr(symbol, "Name", None))
-        type_unique_id = safe_text(getattr(symbol, "UniqueId", None))
-        type_element_id = element_id_text(getattr(symbol, "Id", None))
-
-    return {
-        "familyName": family_name,
-        "typeName": type_name,
-        "typeUniqueId": type_unique_id,
-        "typeElementId": type_element_id,
-    }, symbol
-
-
-def parameter_inventory_key(parameter):
-    stable_id = parameter.get("sharedGuid") or parameter.get("parameterId") or ""
-    return "|".join(
-        (
-            parameter.get("scope") or "",
-            stable_id,
-            parameter.get("name") or "",
-            parameter.get("dataTypeId") or "",
-        )
-    )
-
-
-def sample_value_key(value):
-    return json.dumps(value, ensure_ascii=False, sort_keys=True, separators=(",", ":"))
-
-
-def add_to_inventory(inventory, parameter, max_samples):
-    key = parameter_inventory_key(parameter)
-    entry = inventory.get(key)
-    if entry is None:
-        entry = {
-            "scope": parameter.get("scope"),
-            "name": parameter.get("name"),
-            "parameterId": parameter.get("parameterId"),
-            "isShared": parameter.get("isShared"),
-            "sharedGuid": parameter.get("sharedGuid"),
-            "storageType": parameter.get("storageType"),
-            "dataTypeId": parameter.get("dataTypeId"),
-            "groupTypeId": parameter.get("groupTypeId"),
-            "unitTypeId": parameter.get("unitTypeId"),
-            "occurrenceCount": 0,
-            "populatedCount": 0,
-            "sampleValues": [],
-            "_sampleKeys": set(),
-        }
-        inventory[key] = entry
-    entry["occurrenceCount"] += 1
-    if has_meaningful_value(parameter):
-        entry["populatedCount"] += 1
-    value = parameter.get("value")
-    value_key = sample_value_key(value)
-    if len(entry["sampleValues"]) < max_samples and value_key not in entry["_sampleKeys"]:
-        entry["_sampleKeys"].add(value_key)
-        entry["sampleValues"].append(value)
-
-
-def finalize_inventory(inventory):
-    result = []
-    for entry in inventory.values():
-        clean_entry = dict(entry)
-        clean_entry.pop("_sampleKeys", None)
-        result.append(clean_entry)
-    return sorted(
-        result,
-        key=lambda entry: (
-            entry.get("scope") or "",
-            (entry.get("name") or "").casefold(),
-            entry.get("sharedGuid") or entry.get("parameterId") or "",
-        ),
-    )
-
-
-def loaded_assembly_versions():
-    result = {}
-    try:
-        from System import AppDomain
-
-        for assembly in AppDomain.CurrentDomain.GetAssemblies():
-            try:
-                name = assembly.GetName()
-                simple_name = str(name.Name)
-                if simple_name in (
-                    "DynamoCore",
-                    "DynamoCoreWpf",
-                    "DynamoRevitDS",
-                    "RevitAPI",
-                    "RevitServices",
-                ):
-                    result[simple_name] = str(name.Version)
-            except Exception:
-                continue
-    except Exception:
-        pass
-    return dict(sorted(result.items()))
-
-
-def resolve_output_path(configured_path):
-    timestamp = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
-    default_directory = os.path.join(tempfile.gettempdir(), "leistungsbilanz-dynamo")
-    raw_path = safe_text(configured_path)
-    if raw_path is None or not raw_path.strip():
-        directory = default_directory
-        file_path = os.path.join(
-            directory, "electrical-fixture-parameters-" + timestamp + ".json"
-        )
-    else:
-        expanded = os.path.abspath(os.path.expandvars(os.path.expanduser(raw_path.strip())))
-        if expanded.lower().endswith(".json"):
-            file_path = expanded
-            directory = os.path.dirname(file_path)
-        else:
-            directory = expanded
-            file_path = os.path.join(
-                directory, "electrical-fixture-parameters-" + timestamp + ".json"
-            )
-    if not directory:
-        directory = os.getcwd()
-    if not os.path.isdir(directory):
-        os.makedirs(directory)
-    return file_path
-
-
-def write_json(file_path, payload):
-    temporary_path = file_path + ".tmp"
-    with open(temporary_path, "w", encoding="utf-8", newline="\n") as output:
-        json.dump(payload, output, ensure_ascii=False, indent=2, sort_keys=True)
-        output.write("\n")
-    os.replace(temporary_path, file_path)
-
-
-def get_input(index, default=None):
-    values = globals().get("IN", [])
-    try:
-        value = values[index]
-        return default if value is None else value
-    except Exception:
-        return default
-
-
-def build_report(include_empty, max_samples):
-    document = DocumentManager.Instance.CurrentDBDocument
-    if document is None:
-        raise RuntimeError("No active Revit document is available.")
-    if document.IsFamilyDocument:
-        raise RuntimeError("Open a Revit project document, not a family document.")
-
-    application = document.Application
-    collector = (
-        FilteredElementCollector(document)
-        .OfCategory(BuiltInCategory.OST_ElectricalFixtures)
-        .WhereElementIsNotElementType()
-    )
-    source_elements = list(collector)
-    source_elements.sort(key=lambda element: safe_text(element.UniqueId) or "")
-
-    elements = []
-    types_by_unique_id = {}
-    inventory = {}
-    errors = []
-    elements_without_space = 0
-
-    for element in source_elements:
-        element_errors = []
-        try:
-            family_identity, symbol = read_family_identity(element, document)
-            instance_parameters, parameter_errors = read_parameters(
-                element, "instance", include_empty
-            )
-            element_errors.extend(parameter_errors)
-            for parameter in instance_parameters:
-                add_to_inventory(inventory, parameter, max_samples)
-
-            type_unique_id = family_identity.get("typeUniqueId")
-            if symbol is not None and type_unique_id and type_unique_id not in types_by_unique_id:
-                type_parameters, type_errors = read_parameters(symbol, "type", include_empty)
-                element_errors.extend(type_errors)
-                for parameter in type_parameters:
-                    add_to_inventory(inventory, parameter, max_samples)
-                types_by_unique_id[type_unique_id] = {
-                    **family_identity,
-                    "parameters": type_parameters,
-                }
-
-            space, space_error = read_space(element, document)
-            if space_error:
-                element_errors.append("MEP Space: " + space_error)
-            if space is None:
-                elements_without_space += 1
-
-            elements.append(
-                {
-                    "uniqueId": safe_text(element.UniqueId),
-                    "elementId": element_id_text(element.Id),
-                    "categoryName": safe_text(
-                        None if element.Category is None else element.Category.Name
-                    ),
-                    "family": family_identity,
-                    "space": space,
-                    "instanceParameters": instance_parameters,
-                    "warnings": element_errors,
-                }
-            )
-        except Exception as error:
-            errors.append(
-                {
-                    "uniqueId": safe_text(getattr(element, "UniqueId", None)),
-                    "elementId": element_id_text(getattr(element, "Id", None)),
-                    "error": safe_text(error),
-                }
-            )
-
-    return {
-        "reportSchemaVersion": 1,
-        "generatedAt": datetime.datetime.now(datetime.timezone.utc).isoformat(),
-        "readOnly": True,
-        "complete": len(errors) == 0,
-        "scope": {
-            "builtInCategory": "OST_ElectricalFixtures",
-            "wholeDocument": True,
-            "elementTypesExcluded": True,
-            "includeEmptyParameters": include_empty,
-        },
-        "environment": {
-            "revitVersionNumber": safe_text(getattr(application, "VersionNumber", None)),
-            "revitVersionName": safe_text(getattr(application, "VersionName", None)),
-            "revitSubVersionNumber": safe_text(
-                getattr(application, "SubVersionNumber", None)
-            ),
-            "pythonImplementation": safe_text(getattr(sys.implementation, "name", None)),
-            "pythonVersion": platform.python_version(),
-            "assemblies": loaded_assembly_versions(),
-        },
-        "document": {
-            "title": safe_text(document.Title),
-            "pathName": safe_text(document.PathName),
-            "projectInformationUniqueId": safe_text(document.ProjectInformation.UniqueId),
-        },
-        "summary": {
-            "elementCount": len(source_elements),
-            "exportedElementCount": len(elements),
-            "typeCount": len(types_by_unique_id),
-            "parameterDefinitionCount": len(inventory),
-            "elementsWithoutMepSpace": elements_without_space,
-            "elementErrorCount": len(errors),
-        },
-        "parameterInventory": finalize_inventory(inventory),
-        "types": sorted(
-            types_by_unique_id.values(),
-            key=lambda entry: (
-                (entry.get("familyName") or "").casefold(),
-                (entry.get("typeName") or "").casefold(),
-                entry.get("typeUniqueId") or "",
-            ),
-        ),
-        "elements": elements,
-        "errors": errors,
-    }
-
-
-try:
-    include_empty_input = get_input(1, True)
-    include_empty = bool(include_empty_input)
-    try:
-        max_samples = int(get_input(2, 5))
-    except Exception:
-        max_samples = 5
-    max_samples = max(0, min(max_samples, 50))
-
-    report = build_report(include_empty, max_samples)
-    output_path = resolve_output_path(get_input(0))
-    write_json(output_path, report)
-    OUT = {
-        "ok": True,
-        "filePath": output_path,
-        "complete": report["complete"],
-        "summary": report["summary"],
-        "errors": report["errors"],
-    }
-except Exception as error:
-    OUT = {
-        "ok": False,
-        "error": safe_text(error),
-        "traceback": traceback.format_exc(),
-    }

dynamo/README.md

@@ -1,69 +0,0 @@
-# Revit 2026 / Dynamo diagnostics
-
-This directory contains self-contained Python scripts for a Dynamo **Python
-Script** node. They use only Dynamo's built-in Revit integration, the Revit API
-and the Python standard library. No Dynamo package is required.
-
-The scripts are read-only. They do not start a Revit transaction and do not
-change the open model.
-
-## Python engine
-
-Use the built-in `CPython3` engine in Revit 2026. Autodesk ships Dynamo with
-Revit; optional PythonNet3 packages are not required by these diagnostics.
-
-## 01 - Check model identity
-
-File: `01_check_model_identity.py`
-
-The script reports:
-
-- Revit, Dynamo and Python versions;
-- `ProjectInformation.UniqueId` as a native model-identity candidate;
-- all occurrences and values of `LB_ModelId` and `LB_ProjectId` on Project
-  Information;
-- all Project Information parameters;
-- optional cloud/worksharing identity information when the API exposes it.
-
-Input `IN[0]` is optional. It may be either an output directory or a complete
-`.json` file path. With no input, the report is written below the current
-Windows temporary directory in `leistungsbilanz-dynamo`.
-
-## 02 - Inventory Electrical Fixtures parameters
-
-File: `02_export_electrical_fixture_parameter_inventory.py`
-
-The script reads every instance of
-`BuiltInCategory.OST_ElectricalFixtures` in the complete current document. It
-exports:
-
-- element, family, type and MEP Space identities;
-- every instance parameter and value;
-- every unique family-type parameter and value;
-- an aggregated parameter inventory with occurrence counts and sample values;
-- per-element warnings instead of aborting at the first unreadable element.
-
-Inputs:
-
-- `IN[0]` (optional): output directory or complete `.json` path;
-- `IN[1]` (optional): include empty parameters, default `true`;
-- `IN[2]` (optional): maximum sample values per aggregated parameter, default
-  `5`.
-
-The default output location is again the Windows temporary directory. The
-generated report can contain model paths and project-specific parameter values;
-review it before sharing or committing it.
-
-## Running a script
-
-1. Open the target model in Revit 2026.
-2. Open Dynamo from **Manage > Visual Programming > Dynamo**.
-3. Create a graph and add a **Python Script** node.
-4. Select the `CPython3` engine for the node.
-5. Copy the complete content of the desired `.py` file into the node.
-6. Optionally connect a String node containing the output path to `IN[0]`.
-7. Run the graph and inspect `OUT` for status, counts and the generated path.
-
-For the first test, run `01_check_model_identity.py` in the Revit main model.
-Then run the parameter inventory. Keep both generated JSON files so their
-structure can be checked before the production snapshot DTO is finalized.

scripts/db-verify-circuit-schema.js

@@ -5,6 +5,7 @@ const dbPath = path.resolve("data", "leistungsbilanz.db");
 const db = new Database(dbPath, { readonly: true });
 
 const requiredTables = [
+  "buildings",
   "circuit_sections",
   "circuits",
   "circuit_device_rows",
@@ -12,6 +13,8 @@ const requiredTables = [
   "circuit_protection_devices",
   "distribution_board_components",
   "distribution_board_component_protection_devices",
+  "document_branding_assets",
+  "document_branding_settings",
 ];
 
 const tablePlaceholders = requiredTables.map(() => "?").join(", ");
@@ -87,6 +90,10 @@ const requiredProjectColumns = [
   "description",
   "is_public_building",
   "enabled_distribution_board_supply_types",
+  "site_address",
+  "work_stage",
+  "project_lead",
+  "project_editor",
 ];
 const projectColumns = new Set(
   db.prepare("PRAGMA table_info(projects)").all().map((column) => column.name)
@@ -94,10 +101,21 @@ const projectColumns = new Set(
 const missingProjectColumns = requiredProjectColumns.filter(
   (name) => !projectColumns.has(name)
 );
+const requiredFloorColumns = ["building_id"];
+const floorColumns = new Set(
+  db.prepare("PRAGMA table_info(floors)").all().map((column) => column.name)
+);
+const missingFloorColumns = requiredFloorColumns.filter(
+  (name) => !floorColumns.has(name)
+);
 const requiredDistributionBoardColumns = [
   "floor_id",
   "supply_type",
   "simultaneity_factor",
+  "board_number",
+  "location",
+  "fed_from",
+  "remark",
 ];
 const distributionBoardColumns = new Set(
   db
@@ -145,6 +163,7 @@ console.log(
   requiredCircuitSectionColumns.join(", ")
 );
 console.log("Required project columns:", requiredProjectColumns.join(", "));
+console.log("Required floor columns:", requiredFloorColumns.join(", "));
 console.log(
   "Required distribution-board columns:",
   requiredDistributionBoardColumns.join(", ")
@@ -161,6 +180,11 @@ if (missing.length > 0) {
   process.exit(1);
 }
 
+if (missingFloorColumns.length > 0) {
+  console.error("Missing floor columns:", missingFloorColumns.join(", "));
+  process.exit(1);
+}
+
 if (missingProjectDeviceColumns.length > 0) {
   console.error("Missing project-device columns:", missingProjectDeviceColumns.join(", "));
   process.exit(1);

src/app/globals.css

@@ -220,7 +220,7 @@ a {
   --bs-alert-border-color: #205a38;
 }
 
-/* ── App-Shell / Seitenleiste (nur auf der Projektseite) ────────────────── */
+/* ── App-Shell / Seitenleiste (alle Seiten außer der Seitenansicht) ──── */
 
 .app-shell {
   display: grid;
@@ -1861,3 +1861,144 @@ a.kpi:hover {
 .sidebar-collapsed .sidebar-label {
   display: none;
 }
+
+/* ── Gebäudestruktur (Gebäude → Etagen → Räume) ─────────────────────── */
+
+.structure-columns {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: var(--space-md);
+  align-items: start;
+}
+
+@media (min-width: 992px) {
+  .structure-columns {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
+}
+
+.structure-column-title {
+  font-size: 1rem;
+  font-weight: 700;
+  margin: 0;
+  display: flex;
+  align-items: center;
+}
+
+.structure-icon-button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0.25rem 0.4rem;
+  line-height: 1;
+}
+
+.structure-back-link {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0.35rem 0.45rem;
+  margin-top: 0.1rem;
+}
+
+.structure-list {
+  max-height: 70vh;
+  overflow-y: auto;
+}
+
+.structure-entry {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  padding: 0;
+}
+
+.structure-entry-main {
+  flex: 1 1 auto;
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-sm);
+  padding: 0.55rem 0.75rem;
+  border: 0;
+  background: transparent;
+  color: inherit;
+  text-align: left;
+  font: inherit;
+}
+
+button.structure-entry-main {
+  cursor: pointer;
+}
+
+button.structure-entry-main:hover {
+  background: var(--surface-hover);
+}
+
+button.structure-entry-main:focus-visible {
+  outline: 2px solid var(--accent-blue);
+  outline-offset: -2px;
+}
+
+.structure-entry.is-selected {
+  background: var(--surface-selected);
+  box-shadow: inset 3px 0 0 var(--color-signal);
+}
+
+.structure-entry.is-selected .structure-entry-label {
+  font-weight: 600;
+}
+
+.structure-entry.is-selected button.structure-entry-main:hover {
+  background: transparent;
+}
+
+.structure-entry-text {
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+}
+
+.structure-entry-label {
+  overflow-wrap: anywhere;
+}
+
+.structure-entry-hint {
+  font-size: 0.78rem;
+  color: var(--color-ink-soft);
+}
+
+.structure-entry-meta {
+  flex: 0 0 auto;
+  font-size: 0.78rem;
+  color: var(--color-ink-soft);
+  white-space: nowrap;
+}
+
+.structure-entry-actions {
+  flex: 0 0 auto;
+  display: inline-flex;
+  gap: 4px;
+  padding-right: 0.75rem;
+}
+
+.structure-room-number {
+  font-weight: 600;
+  font-variant-numeric: tabular-nums;
+}
+
+.structure-group-label {
+  font-size: 0.66rem;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  font-weight: 600;
+  color: var(--color-accent);
+  background: var(--panel-bg-subtle);
+  padding: 0.35rem 0.75rem;
+}
+
+.structure-empty {
+  color: var(--color-ink-soft);
+  font-size: 0.9rem;
+}

src/app/projects/[projectId]/page.tsx

@@ -49,17 +49,15 @@ import {
   copyDistributionBoard,
   copyProjectDeviceToGlobal,
   createDistributionBoard,
-  createFloor,
   createProjectDevice,
   createRoom,
-  deleteFloor,
   deleteProjectDevice,
-  deleteRoom,
   deleteDistributionBoard,
   disconnectProjectDeviceRows,
   exportProjectTransfer,
   getProject,
   getProjectDeviceSyncPreview,
+  listBuildings,
   listCircuitLists,
   listDistributionBoards,
   listFloors,
@@ -69,12 +67,11 @@ import {
   importProjectTransfer,
   synchronizeProjectDeviceRows,
   updateDistributionBoard,
-  updateFloor,
   updateProjectDevice,
   updateProjectSettings,
-  updateRoom,
 } from "../../../frontend/utils/api";
 import type {
+  BuildingDto,
   CircuitListDto,
   CreateRoomInput,
   CreateProjectDeviceInput,
@@ -95,6 +92,13 @@ import {
   type DistributionBoardSupplyType,
 } from "../../../shared/constants/distribution-board";
 import { ProjectVersionHistory } from "../../../frontend/components/project-version-history";
+import {
+  DistributionBoardInfoCard,
+  fromDistributionBoardInfoDraft,
+  toDistributionBoardInfoDraft,
+  type DistributionBoardInfoDraft,
+} from "../../../frontend/components/distribution-board-info-card";
+import { Printer } from "lucide-react";
 import {
   ProjectSettingsModal,
   type ProjectSettingsInput,
@@ -102,7 +106,7 @@ import {
 import { FormModal } from "../../../frontend/components/form-modal";
 import { ProjectDeviceModal } from "../../../frontend/components/project-device-modal";
 import { RevitCsvModal } from "../../../frontend/components/revit-csv-modal";
-import { RoomModal } from "../../../frontend/components/room-modal";
+import { FloorSelectOptions } from "../../../frontend/components/floor-select-options";
 
 const projectDeviceSyncFieldLabels: Record<ProjectDeviceSyncField, string> = {
   name: "Technischer Name",
@@ -147,6 +151,7 @@ export default function ProjectDetailPage() {
   const [project, setProject] = useState<ProjectDto | null>(null);
   const [boards, setBoards] = useState<DistributionBoardDto[]>([]);
   const [circuitLists, setCircuitLists] = useState<CircuitListDto[]>([]);
+  const [buildings, setBuildings] = useState<BuildingDto[]>([]);
   const [floors, setFloors] = useState<FloorDto[]>([]);
   const [rooms, setRooms] = useState<RoomDto[]>([]);
   const [projectDevices, setProjectDevices] = useState<ProjectDeviceDto[]>([]);
@@ -165,14 +170,18 @@ export default function ProjectDetailPage() {
     setEditingBoardSimultaneityFactor,
   ] = useState("1");
   const [editingBoardCopyName, setEditingBoardCopyName] = useState("");
-  const [floorName, setFloorName] = useState("");
+  const [editingBoardInfo, setEditingBoardInfo] =
-  const [editingFloor, setEditingFloor] = useState<FloorDto | null>(null);
+    useState<DistributionBoardInfoDraft>(
-  const [editingRoom, setEditingRoom] = useState<RoomDto | null>(null);
+      toDistributionBoardInfoDraft({
+        boardNumber: null,
+        location: null,
+        fedFrom: null,
+        remark: null,
+      })
+    );
   const [isProjectSettingsOpen, setIsProjectSettingsOpen] = useState(false);
   const [isRevitCsvOpen, setIsRevitCsvOpen] = useState(false);
-  const [structureModal, setStructureModal] = useState<
+  const [structureModal, setStructureModal] = useState<"board" | null>(null);
-    "board" | "floor" | "room" | null
-  >(null);
   const [isProjectDeviceModalOpen, setIsProjectDeviceModalOpen] =
     useState(false);
   const [editingProjectDevice, setEditingProjectDevice] =
@@ -200,6 +209,7 @@ export default function ProjectDetailPage() {
       getProject(projectId),
       listDistributionBoards(projectId),
       listCircuitLists(projectId),
+      listBuildings(projectId),
       listFloors(projectId),
       listRooms(projectId),
       listProjectDevices(projectId),
@@ -209,6 +219,7 @@ export default function ProjectDetailPage() {
         currentProject,
         distributionBoards,
         loadedCircuitLists,
+        loadedBuildings,
         loadedFloors,
         loadedRooms,
         loadedProjectDevices,
@@ -217,6 +228,7 @@ export default function ProjectDetailPage() {
         setProject(currentProject);
         setBoards(distributionBoards);
         setCircuitLists(loadedCircuitLists);
+        setBuildings(loadedBuildings);
         setFloors(loadedFloors);
         setRooms(loadedRooms);
         setProjectDevices(loadedProjectDevices);
@@ -229,6 +241,7 @@ export default function ProjectDetailPage() {
   }, [projectId]);
 
   const boardCount = useMemo(() => boards.length, [boards.length]);
+  const buildingCount = useMemo(() => buildings.length, [buildings.length]);
   const floorCount = useMemo(() => floors.length, [floors.length]);
   const roomCount = useMemo(() => rooms.length, [rooms.length]);
   const projectDeviceCount = useMemo(() => projectDevices.length, [projectDevices.length]);
@@ -358,74 +371,6 @@ export default function ProjectDetailPage() {
     }
   }
 
-  async function handleSaveFloor(event: FormEvent<HTMLFormElement>) {
-    event.preventDefault();
-    if (!projectId || !project || !floorName.trim()) {
-      return;
-    }
-    setIsSaving(true);
-    setError(null);
-    try {
-      const result = editingFloor
-        ? await updateFloor(
-            projectId,
-            editingFloor.id,
-            { name: floorName.trim() },
-            project.currentRevision
-          )
-        : await createFloor(
-            projectId,
-            { name: floorName.trim() },
-            project.currentRevision
-          );
-      setFloors((current) =>
-        editingFloor
-          ? current.map((floor) =>
-              floor.id === result.floor.id ? result.floor : floor
-            )
-          : [...current, result.floor]
-      );
-      applyProjectRevision(result.history.currentRevision);
-      setFloorName("");
-      setEditingFloor(null);
-      setStructureModal(null);
-    } catch (err) {
-      setError(err instanceof Error ? err.message : "Etage konnte nicht gespeichert werden.");
-    } finally {
-      setIsSaving(false);
-    }
-  }
-
-  async function handleSaveRoom(input: CreateRoomInput) {
-    if (!projectId || !project) return;
-    setIsSaving(true);
-    setError(null);
-    try {
-      const result = editingRoom
-        ? await updateRoom(
-            projectId,
-            editingRoom.id,
-            input,
-            project.currentRevision
-          )
-        : await createRoom(projectId, input, project.currentRevision);
-      setRooms((current) =>
-        editingRoom
-          ? current.map((room) =>
-              room.id === result.room.id ? result.room : room
-            )
-          : [...current, result.room]
-      );
-      applyProjectRevision(result.history.currentRevision);
-      setEditingRoom(null);
-      setStructureModal(null);
-    } catch (err) {
-      setError(err instanceof Error ? err.message : "Raum konnte nicht gespeichert werden.");
-    } finally {
-      setIsSaving(false);
-    }
-  }
-
   async function handleSaveProjectSettings(input: ProjectSettingsInput) {
     if (!projectId || !project) {
       return;
@@ -542,6 +487,7 @@ export default function ProjectDetailPage() {
       String(board.simultaneityFactor)
     );
     setEditingBoardCopyName(`${board.name} Kopie`);
+    setEditingBoardInfo(toDistributionBoardInfoDraft(board));
   }
 
   function openBoardCreator() {
@@ -577,6 +523,7 @@ export default function ProjectDetailPage() {
           floorId: editingBoardFloorId || null,
           supplyType: editingBoardSupplyType,
           simultaneityFactor,
+          ...fromDistributionBoardInfoDraft(editingBoardInfo),
         },
         project.currentRevision
       );
@@ -616,65 +563,6 @@ export default function ProjectDetailPage() {
     return result;
   }
 
-  function openCreateFloor() {
-    setEditingFloor(null);
-    setFloorName("");
-    setStructureModal("floor");
-  }
-
-  function openEditFloor(floor: FloorDto) {
-    setEditingFloor(floor);
-    setFloorName(floor.name);
-    setStructureModal("floor");
-  }
-
-  function openCreateRoom() {
-    setEditingRoom(null);
-    setStructureModal("room");
-  }
-
-  function openEditRoom(room: RoomDto) {
-    setEditingRoom(room);
-    setStructureModal("room");
-  }
-
-  async function handleDeleteFloor() {
-    if (!projectId || !project || !editingFloor) return;
-    if (!window.confirm(`Etage „${editingFloor.name}“ wirklich löschen?`)) return;
-    setIsSaving(true);
-    setError(null);
-    try {
-      const result = await deleteFloor(projectId, editingFloor.id, project.currentRevision);
-      setFloors((current) => current.filter((floor) => floor.id !== editingFloor.id));
-      applyProjectRevision(result.history.currentRevision);
-      setEditingFloor(null);
-      setFloorName("");
-      setStructureModal(null);
-    } catch (err) {
-      setError(err instanceof Error ? err.message : "Etage konnte nicht gelöscht werden.");
-    } finally {
-      setIsSaving(false);
-    }
-  }
-
-  async function handleDeleteRoom() {
-    if (!projectId || !project || !editingRoom) return;
-    if (!window.confirm(`Raum „${editingRoom.roomNumber} ${editingRoom.roomName}“ wirklich löschen?`)) return;
-    setIsSaving(true);
-    setError(null);
-    try {
-      const result = await deleteRoom(projectId, editingRoom.id, project.currentRevision);
-      setRooms((current) => current.filter((room) => room.id !== editingRoom.id));
-      applyProjectRevision(result.history.currentRevision);
-      setEditingRoom(null);
-      setStructureModal(null);
-    } catch (err) {
-      setError(err instanceof Error ? err.message : "Raum konnte nicht gelöscht werden.");
-    } finally {
-      setIsSaving(false);
-    }
-  }
-
   async function handleCopyBoard() {
     if (
       !projectId ||
@@ -967,6 +855,14 @@ export default function ProjectDetailPage() {
           </p>
         </div>
         <div className="d-flex gap-2">
+          <Link
+            className="btn btn-primary d-inline-flex align-items-center gap-2"
+            href={`/projects/${projectId}/print`}
+            target="_blank"
+          >
+            <Printer aria-hidden="true" size={16} />
+            Seitenansicht
+          </Link>
           <button
             className="btn btn-outline-primary btn-with-icon"
             disabled={!project}
@@ -1002,14 +898,18 @@ export default function ProjectDetailPage() {
           <div className="kpi-label">Verteilungen</div>
           <div className="kpi-value">{boardCount}</div>
         </a>
-        <a className="kpi" href="#etagen">
+        <Link className="kpi" href={`/projects/${projectId}/struktur`}>
+          <div className="kpi-label">Gebäude</div>
+          <div className="kpi-value">{buildingCount}</div>
+        </Link>
+        <Link className="kpi" href={`/projects/${projectId}/struktur`}>
           <div className="kpi-label">Etagen</div>
           <div className="kpi-value">{floorCount}</div>
-        </a>
+        </Link>
-        <a className="kpi" href="#raeume">
+        <Link className="kpi" href={`/projects/${projectId}/struktur`}>
           <div className="kpi-label">Räume</div>
           <div className="kpi-value">{roomCount}</div>
-        </a>
+        </Link>
         <a className="kpi" href="#projektgeraete">
           <div className="kpi-label">Projektgeräte</div>
           <div className="kpi-value">{projectDeviceCount}</div>
@@ -1084,7 +984,9 @@ export default function ProjectDetailPage() {
               <table className="table table-hover align-middle mb-0">
                 <thead>
                   <tr>
+                    <th>Nr.</th>
                     <th>Verteilung</th>
+                    <th>Örtlichkeit</th>
                     <th>Etage</th>
                     <th>Netzart</th>
                     <th>GZF</th>
@@ -1096,7 +998,11 @@ export default function ProjectDetailPage() {
                     const circuitList = circuitListByBoardId.get(board.id);
                     return (
                       <tr key={board.id}>
+                        <td className="fw-semibold">
+                          {board.boardNumber ?? "–"}
+                        </td>
                         <td>{board.name}</td>
+                        <td>{board.location ?? "–"}</td>
                         <td>
                           {board.floorId
                             ? floorById.get(board.floorId)?.name ?? "Unbekannt"
@@ -1146,7 +1052,7 @@ export default function ProjectDetailPage() {
                   })}
                   {!boards.length ? (
                     <tr>
-                      <td colSpan={5} className="text-center text-secondary py-4">
+                      <td colSpan={7} className="text-center text-secondary py-4">
                         Noch keine Verteilungen vorhanden.
                       </td>
                     </tr>
@@ -1161,88 +1067,6 @@ export default function ProjectDetailPage() {
             </div>
           </div>
         </section>
-
-        <section className="col-12 col-lg-5" id="etagen">
-          <div className="card shadow-sm h-100">
-            <div className="card-header d-flex justify-content-between align-items-center">
-              <div>
-                <span>Etagen</span>
-                <span className="badge text-bg-secondary ms-2">{floorCount}</span>
-              </div>
-              <button
-                className="btn btn-sm btn-outline-primary"
-                onClick={openCreateFloor}
-                type="button"
-              >
-                Hinzufügen
-              </button>
-            </div>
-            <ul className="list-group list-group-flush">
-              {floors.map((floor) => (
-                <li className="list-group-item d-flex justify-content-between align-items-center gap-2" key={floor.id}>
-                  <span>{floor.name}</span>
-                  <button className="btn btn-sm btn-outline-secondary" onClick={() => openEditFloor(floor)} type="button">
-                    Bearbeiten
-                  </button>
-                </li>
-              ))}
-              {!floors.length ? (
-                <li className="list-group-item text-secondary">Noch keine Etagen vorhanden.</li>
-              ) : null}
-            </ul>
-          </div>
-        </section>
-
-        <section className="col-12 col-lg-7" id="raeume">
-          <div className="card shadow-sm">
-            <div className="card-header d-flex justify-content-between align-items-center">
-              <div>
-                <span>Räume</span>
-                <span className="badge text-bg-secondary ms-2">{roomCount}</span>
-              </div>
-              <button
-                className="btn btn-sm btn-outline-primary"
-                onClick={openCreateRoom}
-                type="button"
-              >
-                Hinzufügen
-              </button>
-            </div>
-            <div className="table-responsive">
-              <table className="table table-hover align-middle mb-0">
-                <thead>
-                  <tr>
-                    <th>Raumnummer</th>
-                    <th>Raumname</th>
-                    <th>Etage</th>
-                    <th className="text-end">Aktionen</th>
-                  </tr>
-                </thead>
-                <tbody>
-                  {rooms.map((room) => (
-                    <tr key={room.id}>
-                      <td>{room.roomNumber}</td>
-                      <td>{room.roomName}</td>
-                      <td>{room.floorId ? floorById.get(room.floorId)?.name ?? "-" : "-"}</td>
-                      <td className="text-end">
-                        <button className="btn btn-sm btn-outline-secondary" onClick={() => openEditRoom(room)} type="button">
-                          Bearbeiten
-                        </button>
-                      </td>
-                    </tr>
-                  ))}
-                  {!rooms.length ? (
-                    <tr>
-                      <td colSpan={4} className="text-center text-secondary py-4">
-                        Noch keine Räume vorhanden.
-                      </td>
-                    </tr>
-                  ) : null}
-                </tbody>
-              </table>
-            </div>
-          </div>
-        </section>
       </div>
 
       <section className="card shadow-sm mt-4" id="projektgeraete">
@@ -1535,11 +1359,7 @@ export default function ProjectDetailPage() {
                 value={boardFloorId}
               >
                 <option value="">Ohne Etage</option>
-                {floors.map((floor) => (
+                <FloorSelectOptions buildings={buildings} floors={floors} />
-                  <option key={floor.id} value={floor.id}>
-                    {floor.name}
-                  </option>
-                ))}
               </select>
             </div>
             <div className="col-12 col-md-6">
@@ -1605,11 +1425,7 @@ export default function ProjectDetailPage() {
                 value={editingBoardFloorId}
               >
                 <option value="">Ohne Etage</option>
-                {floors.map((floor) => (
+                <FloorSelectOptions buildings={buildings} floors={floors} />
-                  <option key={floor.id} value={floor.id}>
-                    {floor.name}
-                  </option>
-                ))}
               </select>
             </div>
             <div className="col-12 col-md-6">
@@ -1663,6 +1479,12 @@ export default function ProjectDetailPage() {
               </div>
             </div>
           </div>
+          <div className="mt-4">
+            <DistributionBoardInfoCard
+              draft={editingBoardInfo}
+              onChange={setEditingBoardInfo}
+            />
+          </div>
           <hr className="my-4" />
           <section aria-labelledby="copy-distribution-board-heading">
             <h3
@@ -1735,57 +1557,6 @@ export default function ProjectDetailPage() {
         </FormModal>
       ) : null}
 
-      {structureModal === "floor" ? (
-        <FormModal
-          isSaving={isSaving}
-          onClose={() => {
-            setStructureModal(null);
-            setEditingFloor(null);
-          }}
-          onSubmit={handleSaveFloor}
-          submitDisabled={!floorName.trim()}
-          submitLabel={editingFloor ? "Änderungen speichern" : "Etage hinzufügen"}
-          title={editingFloor ? "Etage bearbeiten" : "Etage hinzufügen"}
-        >
-          <label className="form-label" htmlFor="floor-name">
-            Bezeichnung
-          </label>
-          <input
-            autoFocus
-            className="form-control"
-            id="floor-name"
-            onChange={(event) => setFloorName(event.target.value)}
-            placeholder="z. B. EG"
-            required
-            value={floorName}
-          />
-          {editingFloor ? (
-            <div className="border-top mt-4 pt-3">
-              <p className="text-secondary small mb-2">
-                Etagen mit zugeordneten Räumen oder Verteilungen können nicht gelöscht werden.
-              </p>
-              <button className="btn btn-outline-danger" disabled={isSaving} onClick={() => void handleDeleteFloor()} type="button">
-                Etage löschen
-              </button>
-            </div>
-          ) : null}
-        </FormModal>
-      ) : null}
-
-      {structureModal === "room" ? (
-        <RoomModal
-          floors={floors}
-          initialRoom={editingRoom ?? undefined}
-          isSaving={isSaving}
-          onClose={() => {
-            setStructureModal(null);
-            setEditingRoom(null);
-          }}
-          onDelete={editingRoom ? () => void handleDeleteRoom() : undefined}
-          onSave={handleSaveRoom}
-        />
-      ) : null}
-
       {isProjectDeviceModalOpen ? (
         <ProjectDeviceModal
           globalDevices={globalDevices}

src/app/projects/[projectId]/print/page.tsx

@@ -0,0 +1,360 @@
+"use client";
+
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { ChangeEvent, FormEvent, useEffect, useMemo, useState } from "react";
+import "../../../../frontend/print/print-document.css";
+import {
+  deleteDocumentLogo,
+  documentLogoUrl,
+  getCircuitTree,
+  getDocumentBranding,
+  getProject,
+  listCircuitLists,
+  listDistributionBoards,
+  listFloors,
+  listProjectSnapshots,
+  updateOfficeProfile,
+  uploadDocumentLogo,
+} from "../../../../frontend/utils/api";
+import type {
+  DocumentLogoMetadataDto,
+  OfficeProfileDto,
+  ProjectDto,
+  ProjectSnapshotMetadataDto,
+} from "../../../../frontend/types";
+import { FormModal } from "../../../../frontend/components/form-modal";
+import {
+  officeProfileFieldLabels,
+  officeProfileFieldMaxLengths,
+} from "../../../../shared/constants/project-cover";
+import { PrintDocument } from "../../../../frontend/print/print-document";
+import {
+  assertPrintRevisionConsistency,
+  buildPreliminaryBoardHierarchy,
+  summarizePrintBoard,
+  type PrintBoardSummary,
+} from "../../../../frontend/print/print-document-model";
+import {
+  documentLogoMimeTypes,
+  maxDocumentLogoBytes,
+} from "../../../../shared/constants/document-branding";
+
+type PlanFormat = "a4" | "a3";
+
+interface PrintData {
+  project: ProjectDto;
+  summaries: PrintBoardSummary[];
+  namedSnapshots: ProjectSnapshotMetadataDto[];
+}
+
+const boardSortCollator = new Intl.Collator("de", { numeric: true });
+
+function cssString(value: string) {
+  return JSON.stringify(value.replace(/[<>\r\n]/g, " "));
+}
+
+function pageRules(project: ProjectDto, stand: string, format: PlanFormat) {
+  const marginBoxes = `
+    @bottom-left { content: ${cssString(`${project.name} · Leistungsbilanz`)}; font: 7.5pt Arial, sans-serif; color: #6b7280; }
+    @bottom-center { content: ${cssString(`Stand ${stand} · Datenstand Rev. ${project.currentRevision}`)}; font: 7.5pt Arial, sans-serif; color: #6b7280; }
+    @bottom-right { content: "Seite " counter(page) " von " counter(pages); font: 7.5pt Arial, sans-serif; color: #6b7280; }`;
+  return `
+    @page lb-portrait { size: A4 portrait; margin: 14mm 16mm 16mm; ${marginBoxes} }
+    @page lb-landscape { size: ${format === "a3" ? "A3" : "A4"} landscape; margin: 10mm 10mm 13mm; ${marginBoxes} }`;
+}
+
+export default function ProjectPrintPage() {
+  const params = useParams<{ projectId: string }>();
+  const projectId = params.projectId;
+  const [data, setData] = useState<PrintData | null>(null);
+  const [logo, setLogo] = useState<DocumentLogoMetadataDto | null>(null);
+  const [office, setOffice] = useState<OfficeProfileDto>({
+    officeName: null,
+    officeAddress: null,
+  });
+  const [officeDraft, setOfficeDraft] = useState<{
+    officeName: string;
+    officeAddress: string;
+  } | null>(null);
+  const [format, setFormat] = useState<PlanFormat>("a4");
+  const [error, setError] = useState<string | null>(null);
+  const [message, setMessage] = useState<string | null>(null);
+  const [isBusy, setIsBusy] = useState(false);
+  const [printedAt] = useState(() => new Date());
+
+  useEffect(() => {
+    if (!projectId) {
+      return;
+    }
+    let cancelled = false;
+    async function load() {
+      const [project, boards, circuitLists, floors, snapshots, branding] =
+        await Promise.all([
+          getProject(projectId),
+          listDistributionBoards(projectId),
+          listCircuitLists(projectId),
+          listFloors(projectId),
+          listProjectSnapshots(projectId),
+          getDocumentBranding(),
+        ]);
+      const floorNameById = new Map(floors.map((floor) => [floor.id, floor.name]));
+      const summaries = await Promise.all(
+        [...boards]
+          .sort(
+            (left, right) =>
+              boardSortCollator.compare(left.boardNumber ?? "", right.boardNumber ?? "") ||
+              boardSortCollator.compare(left.name, right.name)
+          )
+          .flatMap((board) => {
+            const circuitList = circuitLists.find(
+              (list) => list.distributionBoardId === board.id
+            );
+            return circuitList ? [{ board, circuitList }] : [];
+          })
+          .map(async ({ board, circuitList }) =>
+            summarizePrintBoard({
+              board,
+              circuitListId: circuitList.id,
+              tree: await getCircuitTree(projectId, circuitList.id),
+              floorName: board.floorId ? floorNameById.get(board.floorId) ?? null : null,
+            })
+          )
+      );
+      const finalProject = await getProject(projectId);
+      assertPrintRevisionConsistency(project.currentRevision, summaries, finalProject.currentRevision);
+      if (cancelled) {
+        return;
+      }
+      setData({
+        project,
+        summaries,
+        namedSnapshots: snapshots
+          .filter((snapshot) => snapshot.kind === "named")
+          .sort((left, right) => left.createdAtIso.localeCompare(right.createdAtIso)),
+      });
+      setLogo(branding.logo);
+      setOffice(branding.office);
+      document.title = `Leistungsbilanz – ${project.name}`;
+    }
+    load().catch((err: unknown) => {
+      if (!cancelled) {
+        setError(err instanceof Error ? err.message : "Die Seitenansicht konnte nicht geladen werden.");
+      }
+    });
+    return () => {
+      cancelled = true;
+    };
+  }, [projectId]);
+
+  const entries = useMemo(
+    () => (data ? buildPreliminaryBoardHierarchy(data.summaries) : []),
+    [data]
+  );
+  const stand = useMemo(
+    () =>
+      new Intl.DateTimeFormat("de-DE", {
+        day: "2-digit",
+        month: "2-digit",
+        year: "numeric",
+      }).format(printedAt),
+    [printedAt]
+  );
+  const logoSrc = logo
+    ? `${documentLogoUrl}?v=${encodeURIComponent(logo.updatedAtIso)}`
+    : null;
+
+  async function handleLogoUpload(event: ChangeEvent<HTMLInputElement>) {
+    const file = event.target.files?.[0];
+    event.target.value = "";
+    if (!file) {
+      return;
+    }
+    if (!(documentLogoMimeTypes as readonly string[]).includes(file.type)) {
+      setError("Bitte ein PNG-, JPG- oder SVG-Bild wählen.");
+      return;
+    }
+    if (file.size > maxDocumentLogoBytes) {
+      setError("Das Logo darf höchstens 2 MB groß sein.");
+      return;
+    }
+    setIsBusy(true);
+    setError(null);
+    try {
+      const result = await uploadDocumentLogo(file);
+      setLogo(result.logo);
+      setMessage("Logo hinterlegt. Es gilt für alle Projekte.");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Das Logo konnte nicht gespeichert werden.");
+    } finally {
+      setIsBusy(false);
+    }
+  }
+
+  async function handleOfficeSave(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (!officeDraft) {
+      return;
+    }
+    setIsBusy(true);
+    setError(null);
+    try {
+      const result = await updateOfficeProfile({
+        officeName: officeDraft.officeName.trim() || null,
+        officeAddress: officeDraft.officeAddress.trim() || null,
+      });
+      setOffice(result.office);
+      setOfficeDraft(null);
+      setMessage("Büroangaben gespeichert. Sie gelten für alle Projekte.");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Die Büroangaben konnten nicht gespeichert werden.");
+    } finally {
+      setIsBusy(false);
+    }
+  }
+
+  async function handleLogoDelete() {
+    if (!window.confirm("Hinterlegtes Logo für alle Projekte entfernen?")) {
+      return;
+    }
+    setIsBusy(true);
+    setError(null);
+    try {
+      await deleteDocumentLogo();
+      setLogo(null);
+      setMessage("Logo entfernt.");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Das Logo konnte nicht entfernt werden.");
+    } finally {
+      setIsBusy(false);
+    }
+  }
+
+  return (
+    // Paper output: always light, independent of the app's dark mode.
+    <div
+      className={format === "a3" ? "print-view pd-a3" : "print-view"}
+      data-bs-theme="light"
+    >
+      {data ? <style>{pageRules(data.project, stand, format)}</style> : null}
+      <div className="pd-toolbar">
+        <span className="pd-toolbar-title">
+          Seitenansicht{data ? ` · ${data.project.name}` : ""}
+        </span>
+        {message ? <span className="pd-toolbar-message">{message}</span> : null}
+        {error ? <span className="pd-toolbar-error">{error}</span> : null}
+        <label className="d-flex align-items-center gap-2">
+          Planformat
+          <select
+            className="form-select form-select-sm w-auto"
+            onChange={(event) => setFormat(event.target.value as PlanFormat)}
+            value={format}
+          >
+            <option value="a4">A4 quer</option>
+            <option value="a3">A3 quer</option>
+          </select>
+        </label>
+        <button
+          className="btn btn-sm btn-outline-primary"
+          disabled={isBusy}
+          onClick={() =>
+            setOfficeDraft({
+              officeName: office.officeName ?? "",
+              officeAddress: office.officeAddress ?? "",
+            })
+          }
+          type="button"
+        >
+          Büroangaben
+        </button>
+        <label className={`btn btn-sm btn-outline-primary mb-0${isBusy ? " disabled" : ""}`}>
+          {logo ? "Logo ersetzen" : "Logo hinterlegen"}
+          <input
+            accept={documentLogoMimeTypes.join(",")}
+            disabled={isBusy}
+            hidden
+            onChange={(event) => void handleLogoUpload(event)}
+            type="file"
+          />
+        </label>
+        {logo ? (
+          <button
+            className="btn btn-sm btn-outline-secondary"
+            disabled={isBusy}
+            onClick={() => void handleLogoDelete()}
+            type="button"
+          >
+            Logo entfernen
+          </button>
+        ) : null}
+        <button
+          className="btn btn-sm btn-primary"
+          disabled={!data}
+          onClick={() => window.print()}
+          type="button"
+        >
+          Als PDF speichern / Drucken
+        </button>
+        <Link className="btn btn-sm btn-outline-secondary" href={`/projects/${projectId}`}>
+          Zum Projekt
+        </Link>
+      </div>
+      {officeDraft ? (
+        <FormModal
+          description="Planverfasser auf dem Deckblatt. Gilt für alle Projekte."
+          isSaving={isBusy}
+          onClose={() => setOfficeDraft(null)}
+          onSubmit={handleOfficeSave}
+          submitLabel="Büroangaben speichern"
+          title="Büroangaben"
+        >
+          <div className="row g-3">
+            <div className="col-12">
+              <label className="form-label" htmlFor="office-name">
+                {officeProfileFieldLabels.officeName}
+              </label>
+              <input
+                autoFocus
+                className="form-control"
+                id="office-name"
+                maxLength={officeProfileFieldMaxLengths.officeName}
+                onChange={(event) =>
+                  setOfficeDraft({ ...officeDraft, officeName: event.target.value })
+                }
+                value={officeDraft.officeName}
+              />
+            </div>
+            <div className="col-12">
+              <label className="form-label" htmlFor="office-address">
+                {officeProfileFieldLabels.officeAddress}
+              </label>
+              <textarea
+                className="form-control"
+                id="office-address"
+                maxLength={officeProfileFieldMaxLengths.officeAddress}
+                onChange={(event) =>
+                  setOfficeDraft({ ...officeDraft, officeAddress: event.target.value })
+                }
+                placeholder={"Straße Nr.\nPLZ Ort"}
+                rows={3}
+                value={officeDraft.officeAddress}
+              />
+            </div>
+          </div>
+        </FormModal>
+      ) : null}
+      {data ? (
+        <PrintDocument
+          entries={entries}
+          logoSrc={logoSrc}
+          namedSnapshots={data.namedSnapshots}
+          office={office}
+          printedAt={printedAt}
+          project={data.project}
+        />
+      ) : error ? null : (
+        <p className="p-4 text-secondary">Seitenansicht wird geladen …</p>
+      )}
+    </div>
+  );
+}

src/app/projects/[projectId]/struktur/page.tsx

@@ -0,0 +1,792 @@
+"use client";
+
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import {
+  type FormEvent,
+  type ReactNode,
+  useCallback,
+  useEffect,
+  useMemo,
+  useState,
+} from "react";
+import { ArrowLeft, Pencil, Plus, Trash2 } from "lucide-react";
+import {
+  createBuilding,
+  createFloor,
+  createRoom,
+  deleteBuilding,
+  deleteFloor,
+  deleteRoom,
+  getProject,
+  listBuildings,
+  listFloors,
+  listRooms,
+  updateBuilding,
+  updateFloor,
+  updateRoom,
+} from "../../../../frontend/utils/api";
+import type {
+  BuildingDto,
+  CreateRoomInput,
+  FloorDto,
+  ProjectCommandResultDto,
+  ProjectDto,
+  RoomDto,
+} from "../../../../frontend/types";
+import {
+  ALL_SELECTION,
+  UNASSIGNED_BUILDING_LABEL,
+  UNASSIGNED_FLOOR_LABEL,
+  UNASSIGNED_SELECTION,
+  countFloorsByBuilding,
+  countRoomsByFloor,
+  defaultBuildingIdForNewFloor,
+  defaultFloorIdForNewRoom,
+  describeRoomLocation,
+  filterFloorsByBuilding,
+  filterRooms,
+  groupFloorsByBuilding,
+  hasFloorsWithoutBuilding,
+  normalizeBuildingSelection,
+  normalizeFloorSelection,
+  showsRoomsWithoutFloorEntry,
+  type StructureSelection,
+} from "../../../../frontend/utils/building-structure";
+import { FormModal } from "../../../../frontend/components/form-modal";
+import { RoomModal } from "../../../../frontend/components/room-modal";
+
+const BUILDING_HAS_FLOORS_MESSAGE =
+  "Das Gebäude kann nicht gelöscht werden, solange Etagen zugeordnet sind.";
+
+type StructureDialog =
+  | { kind: "building"; building: BuildingDto | null }
+  | { kind: "floor"; floor: FloorDto | null }
+  | { kind: "room"; room: RoomDto | null; defaultFloorId: string };
+
+function formatCount(count: number, singular: string, plural: string) {
+  return `${count} ${count === 1 ? singular : plural}`;
+}
+
+function compareRooms(left: RoomDto, right: RoomDto) {
+  return (
+    left.roomNumber.localeCompare(right.roomNumber, "de", { numeric: true }) ||
+    left.roomName.localeCompare(right.roomName, "de")
+  );
+}
+
+interface StructureColumnProps {
+  addLabel: string;
+  children: ReactNode;
+  count: number;
+  headingId: string;
+  isAddDisabled: boolean;
+  onAdd: () => void;
+  title: string;
+}
+
+function StructureColumn({
+  addLabel,
+  children,
+  count,
+  headingId,
+  isAddDisabled,
+  onAdd,
+  title,
+}: StructureColumnProps) {
+  return (
+    <section aria-labelledby={headingId} className="card shadow-sm structure-column">
+      <div className="card-header d-flex justify-content-between align-items-center gap-2">
+        <h2 className="structure-column-title" id={headingId}>
+          {title}
+          <span className="badge text-bg-secondary ms-2">{count}</span>
+        </h2>
+        <button
+          aria-label={addLabel}
+          className="btn btn-sm btn-outline-primary structure-icon-button"
+          disabled={isAddDisabled}
+          onClick={onAdd}
+          title={addLabel}
+          type="button"
+        >
+          <Plus aria-hidden="true" size={16} />
+        </button>
+      </div>
+      <ul className="list-group list-group-flush structure-list">{children}</ul>
+    </section>
+  );
+}
+
+interface StructureEntryProps {
+  actions?: ReactNode;
+  hint?: string;
+  isSelected?: boolean;
+  label: ReactNode;
+  meta?: string;
+  onSelect?: () => void;
+}
+
+function StructureEntry({
+  actions,
+  hint,
+  isSelected = false,
+  label,
+  meta,
+  onSelect,
+}: StructureEntryProps) {
+  const content = (
+    <>
+      <span className="structure-entry-text">
+        <span className="structure-entry-label">{label}</span>
+        {hint ? <span className="structure-entry-hint">{hint}</span> : null}
+      </span>
+      {meta ? <span className="structure-entry-meta">{meta}</span> : null}
+    </>
+  );
+  return (
+    <li
+      className={
+        isSelected
+          ? "list-group-item structure-entry is-selected"
+          : "list-group-item structure-entry"
+      }
+    >
+      {onSelect ? (
+        <button
+          aria-pressed={isSelected}
+          className="structure-entry-main"
+          onClick={onSelect}
+          type="button"
+        >
+          {content}
+        </button>
+      ) : (
+        <div className="structure-entry-main">{content}</div>
+      )}
+      {actions ? <div className="structure-entry-actions">{actions}</div> : null}
+    </li>
+  );
+}
+
+interface EntryActionsProps {
+  deleteLabel: string;
+  editLabel: string;
+  isDisabled: boolean;
+  onDelete: () => void;
+  onEdit: () => void;
+}
+
+function EntryActions({
+  deleteLabel,
+  editLabel,
+  isDisabled,
+  onDelete,
+  onEdit,
+}: EntryActionsProps) {
+  return (
+    <>
+      <button
+        aria-label={editLabel}
+        className="btn btn-sm btn-outline-secondary structure-icon-button"
+        disabled={isDisabled}
+        onClick={onEdit}
+        title={editLabel}
+        type="button"
+      >
+        <Pencil aria-hidden="true" size={14} />
+      </button>
+      <button
+        aria-label={deleteLabel}
+        className="btn btn-sm btn-outline-danger structure-icon-button"
+        disabled={isDisabled}
+        onClick={onDelete}
+        title={deleteLabel}
+        type="button"
+      >
+        <Trash2 aria-hidden="true" size={14} />
+      </button>
+    </>
+  );
+}
+
+export default function BuildingStructurePage() {
+  const params = useParams<{ projectId: string }>();
+  const projectId = params.projectId;
+  const [project, setProject] = useState<ProjectDto | null>(null);
+  const [buildings, setBuildings] = useState<BuildingDto[]>([]);
+  const [floors, setFloors] = useState<FloorDto[]>([]);
+  const [rooms, setRooms] = useState<RoomDto[]>([]);
+  const [buildingSelection, setBuildingSelection] =
+    useState<StructureSelection>(ALL_SELECTION);
+  const [floorSelection, setFloorSelection] =
+    useState<StructureSelection>(ALL_SELECTION);
+  const [dialog, setDialog] = useState<StructureDialog | null>(null);
+  const [dialogName, setDialogName] = useState("");
+  const [dialogBuildingId, setDialogBuildingId] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+  const [isSaving, setIsSaving] = useState(false);
+
+  const reloadStructure = useCallback(async () => {
+    const [currentProject, loadedBuildings, loadedFloors, loadedRooms] =
+      await Promise.all([
+        getProject(projectId),
+        listBuildings(projectId),
+        listFloors(projectId),
+        listRooms(projectId),
+      ]);
+    setProject(currentProject);
+    setBuildings(loadedBuildings);
+    setFloors(loadedFloors);
+    setRooms(loadedRooms);
+  }, [projectId]);
+
+  useEffect(() => {
+    if (!projectId) {
+      return;
+    }
+    setIsLoading(true);
+    reloadStructure()
+      .then(() => setError(null))
+      .catch((err: unknown) =>
+        setError(
+          err instanceof Error
+            ? err.message
+            : "Gebäudestruktur konnte nicht geladen werden."
+        )
+      )
+      .finally(() => setIsLoading(false));
+  }, [projectId, reloadStructure]);
+
+  const effectiveBuildingSelection = normalizeBuildingSelection(
+    buildingSelection,
+    floors,
+    buildings
+  );
+  const effectiveFloorSelection = normalizeFloorSelection(
+    floorSelection,
+    rooms,
+    floors,
+    buildings,
+    effectiveBuildingSelection
+  );
+
+  const visibleFloors = useMemo(
+    () => filterFloorsByBuilding(floors, buildings, effectiveBuildingSelection),
+    [buildings, effectiveBuildingSelection, floors]
+  );
+  const visibleFloorGroups = useMemo(
+    () =>
+      effectiveBuildingSelection === ALL_SELECTION && buildings.length
+        ? groupFloorsByBuilding(visibleFloors, buildings)
+        : [{ buildingId: null, label: "", floors: visibleFloors }],
+    [buildings, effectiveBuildingSelection, visibleFloors]
+  );
+  const visibleRooms = useMemo(
+    () =>
+      filterRooms(
+        rooms,
+        floors,
+        buildings,
+        effectiveBuildingSelection,
+        effectiveFloorSelection
+      ).sort(compareRooms),
+    [buildings, effectiveBuildingSelection, effectiveFloorSelection, floors, rooms]
+  );
+  const roomsInBuildingSelection = useMemo(
+    () =>
+      filterRooms(rooms, floors, buildings, effectiveBuildingSelection, ALL_SELECTION)
+        .length,
+    [buildings, effectiveBuildingSelection, floors, rooms]
+  );
+  const floorCountByBuilding = useMemo(
+    () => countFloorsByBuilding(floors, buildings),
+    [buildings, floors]
+  );
+  const roomCountByFloor = useMemo(
+    () => countRoomsByFloor(rooms, floors),
+    [floors, rooms]
+  );
+  const showUnassignedBuilding = hasFloorsWithoutBuilding(floors, buildings);
+  const showUnassignedFloor = showsRoomsWithoutFloorEntry(
+    rooms,
+    floors,
+    effectiveBuildingSelection
+  );
+  const isBusy = isSaving || !project;
+
+  function selectBuilding(selection: StructureSelection) {
+    setBuildingSelection(selection);
+    setFloorSelection(ALL_SELECTION);
+  }
+
+  async function runCommand<TResult extends ProjectCommandResultDto>(
+    execute: (expectedRevision: number) => Promise<TResult>,
+    fallbackMessage: string
+  ): Promise<boolean> {
+    if (!project) {
+      return false;
+    }
+    setIsSaving(true);
+    setError(null);
+    try {
+      const result = await execute(project.currentRevision);
+      setProject((current) =>
+        current
+          ? { ...current, currentRevision: result.history.currentRevision }
+          : current
+      );
+      await reloadStructure();
+      return true;
+    } catch (err) {
+      setError(err instanceof Error ? err.message : fallbackMessage);
+      // Refresh the revision and lists so a stale state does not block the
+      // next attempt; the command error stays visible.
+      await reloadStructure().catch(() => undefined);
+      return false;
+    } finally {
+      setIsSaving(false);
+    }
+  }
+
+  function openBuildingDialog(building: BuildingDto | null) {
+    setDialogName(building?.name ?? "");
+    setDialog({ kind: "building", building });
+  }
+
+  function openFloorDialog(floor: FloorDto | null) {
+    setDialogName(floor?.name ?? "");
+    setDialogBuildingId(
+      floor
+        ? floor.buildingId ?? ""
+        : defaultBuildingIdForNewFloor(effectiveBuildingSelection)
+    );
+    setDialog({ kind: "floor", floor });
+  }
+
+  function openRoomDialog(room: RoomDto | null) {
+    setDialog({
+      kind: "room",
+      room,
+      defaultFloorId: defaultFloorIdForNewRoom(effectiveFloorSelection),
+    });
+  }
+
+  async function handleSaveBuilding(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (dialog?.kind !== "building" || !dialogName.trim()) {
+      return;
+    }
+    const editingBuilding = dialog.building;
+    const name = dialogName.trim();
+    // An unchanged dialog is not a command; the backend rejects no-op updates.
+    if (editingBuilding && editingBuilding.name === name) {
+      setDialog(null);
+      return;
+    }
+    const saved = await runCommand(
+      (expectedRevision) =>
+        editingBuilding
+          ? updateBuilding(projectId, editingBuilding.id, { name }, expectedRevision)
+          : createBuilding(projectId, { name }, expectedRevision),
+      "Gebäude konnte nicht gespeichert werden."
+    );
+    if (saved) {
+      setDialog(null);
+    }
+  }
+
+  async function handleSaveFloor(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (dialog?.kind !== "floor" || !dialogName.trim()) {
+      return;
+    }
+    const editingFloor = dialog.floor;
+    const input = {
+      name: dialogName.trim(),
+      buildingId: dialogBuildingId || null,
+    };
+    if (
+      editingFloor &&
+      editingFloor.name === input.name &&
+      editingFloor.buildingId === input.buildingId
+    ) {
+      setDialog(null);
+      return;
+    }
+    const saved = await runCommand(
+      (expectedRevision) =>
+        editingFloor
+          ? updateFloor(projectId, editingFloor.id, input, expectedRevision)
+          : createFloor(projectId, input, expectedRevision),
+      "Etage konnte nicht gespeichert werden."
+    );
+    if (saved) {
+      setDialog(null);
+    }
+  }
+
+  async function handleSaveRoom(input: CreateRoomInput) {
+    if (dialog?.kind !== "room") {
+      return;
+    }
+    const editingRoom = dialog.room;
+    if (
+      editingRoom &&
+      editingRoom.roomNumber === input.roomNumber.trim() &&
+      editingRoom.roomName === input.roomName.trim() &&
+      editingRoom.floorId === (input.floorId || null)
+    ) {
+      setDialog(null);
+      return;
+    }
+    const saved = await runCommand(
+      (expectedRevision) =>
+        editingRoom
+          ? updateRoom(projectId, editingRoom.id, input, expectedRevision)
+          : createRoom(projectId, input, expectedRevision),
+      "Raum konnte nicht gespeichert werden."
+    );
+    if (saved) {
+      setDialog(null);
+    }
+  }
+
+  async function handleDeleteBuilding(building: BuildingDto) {
+    if ((floorCountByBuilding.get(building.id) ?? 0) > 0) {
+      setError(BUILDING_HAS_FLOORS_MESSAGE);
+      return;
+    }
+    if (!window.confirm(`Gebäude „${building.name}“ wirklich löschen?`)) {
+      return;
+    }
+    await runCommand(
+      (expectedRevision) =>
+        deleteBuilding(projectId, building.id, expectedRevision),
+      "Gebäude konnte nicht gelöscht werden."
+    );
+  }
+
+  async function handleDeleteFloor(floor: FloorDto) {
+    if (!window.confirm(`Etage „${floor.name}“ wirklich löschen?`)) {
+      return;
+    }
+    await runCommand(
+      (expectedRevision) => deleteFloor(projectId, floor.id, expectedRevision),
+      "Etage konnte nicht gelöscht werden."
+    );
+  }
+
+  async function handleDeleteRoom(room: RoomDto) {
+    if (
+      !window.confirm(
+        `Raum „${room.roomNumber} ${room.roomName}“ wirklich löschen?`
+      )
+    ) {
+      return;
+    }
+    await runCommand(
+      (expectedRevision) => deleteRoom(projectId, room.id, expectedRevision),
+      "Raum konnte nicht gelöscht werden."
+    );
+  }
+
+  return (
+    <main className="container py-4">
+      <div className="page-header">
+        <div className="d-flex align-items-start gap-3">
+          <Link
+            aria-label="Zurück zur Projektübersicht"
+            className="btn btn-outline-secondary btn-sm structure-back-link"
+            href={`/projects/${projectId}`}
+            title="Zurück zur Projektübersicht"
+          >
+            <ArrowLeft aria-hidden="true" size={18} />
+          </Link>
+          <div>
+            <div className="kicker">{project?.name ?? "Projekt"}</div>
+            <h1>Gebäudestruktur</h1>
+            <p className="text-secondary mb-0">
+              Gebäude, Etagen und Räume des Projekts gliedern und pflegen.
+            </p>
+          </div>
+        </div>
+      </div>
+
+      {error ? (
+        <div className="alert alert-warning" role="alert">
+          {error}
+        </div>
+      ) : null}
+      {isLoading ? (
+        <p className="text-secondary" role="status">
+          Gebäudestruktur wird geladen …
+        </p>
+      ) : null}
+
+      <div className="structure-columns">
+        <StructureColumn
+          addLabel="Gebäude hinzufügen"
+          count={buildings.length}
+          headingId="structure-buildings-heading"
+          isAddDisabled={isBusy}
+          onAdd={() => openBuildingDialog(null)}
+          title="Gebäude"
+        >
+          <StructureEntry
+            isSelected={effectiveBuildingSelection === ALL_SELECTION}
+            label="Alle"
+            meta={formatCount(floors.length, "Etage", "Etagen")}
+            onSelect={() => selectBuilding(ALL_SELECTION)}
+          />
+          {buildings.map((building) => (
+            <StructureEntry
+              actions={
+                <EntryActions
+                  deleteLabel={`Gebäude „${building.name}“ löschen`}
+                  editLabel={`Gebäude „${building.name}“ bearbeiten`}
+                  isDisabled={isBusy}
+                  onDelete={() => void handleDeleteBuilding(building)}
+                  onEdit={() => openBuildingDialog(building)}
+                />
+              }
+              isSelected={effectiveBuildingSelection === building.id}
+              key={building.id}
+              label={building.name}
+              meta={formatCount(
+                floorCountByBuilding.get(building.id) ?? 0,
+                "Etage",
+                "Etagen"
+              )}
+              onSelect={() => selectBuilding(building.id)}
+            />
+          ))}
+          {showUnassignedBuilding ? (
+            <StructureEntry
+              isSelected={effectiveBuildingSelection === UNASSIGNED_SELECTION}
+              label={<em>{UNASSIGNED_BUILDING_LABEL}</em>}
+              meta={formatCount(
+                floorCountByBuilding.get(null) ?? 0,
+                "Etage",
+                "Etagen"
+              )}
+              onSelect={() => selectBuilding(UNASSIGNED_SELECTION)}
+            />
+          ) : null}
+          {!buildings.length && !isLoading ? (
+            <li className="list-group-item structure-empty">
+              Noch keine Gebäude vorhanden.
+            </li>
+          ) : null}
+        </StructureColumn>
+
+        <StructureColumn
+          addLabel="Etage hinzufügen"
+          count={visibleFloors.length}
+          headingId="structure-floors-heading"
+          isAddDisabled={isBusy}
+          onAdd={() => openFloorDialog(null)}
+          title="Etagen"
+        >
+          <StructureEntry
+            isSelected={effectiveFloorSelection === ALL_SELECTION}
+            label="Alle"
+            meta={formatCount(roomsInBuildingSelection, "Raum", "Räume")}
+            onSelect={() => setFloorSelection(ALL_SELECTION)}
+          />
+          {visibleFloorGroups.map((group) => (
+            <FloorGroupEntries
+              key={group.buildingId ?? "unassigned"}
+              label={group.label}
+            >
+              {group.floors.map((floor) => (
+                <StructureEntry
+                  actions={
+                    <EntryActions
+                      deleteLabel={`Etage „${floor.name}“ löschen`}
+                      editLabel={`Etage „${floor.name}“ bearbeiten`}
+                      isDisabled={isBusy}
+                      onDelete={() => void handleDeleteFloor(floor)}
+                      onEdit={() => openFloorDialog(floor)}
+                    />
+                  }
+                  isSelected={effectiveFloorSelection === floor.id}
+                  key={floor.id}
+                  label={floor.name}
+                  meta={formatCount(
+                    roomCountByFloor.get(floor.id) ?? 0,
+                    "Raum",
+                    "Räume"
+                  )}
+                  onSelect={() => setFloorSelection(floor.id)}
+                />
+              ))}
+            </FloorGroupEntries>
+          ))}
+          {showUnassignedFloor ? (
+            <StructureEntry
+              isSelected={effectiveFloorSelection === UNASSIGNED_SELECTION}
+              label={<em>{UNASSIGNED_FLOOR_LABEL}</em>}
+              meta={formatCount(roomCountByFloor.get(null) ?? 0, "Raum", "Räume")}
+              onSelect={() => setFloorSelection(UNASSIGNED_SELECTION)}
+            />
+          ) : null}
+          {!visibleFloors.length && !isLoading ? (
+            <li className="list-group-item structure-empty">
+              {floors.length
+                ? "Keine Etagen in dieser Auswahl."
+                : "Noch keine Etagen vorhanden."}
+            </li>
+          ) : null}
+        </StructureColumn>
+
+        <StructureColumn
+          addLabel="Raum hinzufügen"
+          count={visibleRooms.length}
+          headingId="structure-rooms-heading"
+          isAddDisabled={isBusy}
+          onAdd={() => openRoomDialog(null)}
+          title="Räume"
+        >
+          {visibleRooms.map((room) => (
+            <StructureEntry
+              actions={
+                <EntryActions
+                  deleteLabel={`Raum „${room.roomNumber} ${room.roomName}“ löschen`}
+                  editLabel={`Raum „${room.roomNumber} ${room.roomName}“ bearbeiten`}
+                  isDisabled={isBusy}
+                  onDelete={() => void handleDeleteRoom(room)}
+                  onEdit={() => openRoomDialog(room)}
+                />
+              }
+              hint={
+                effectiveFloorSelection === ALL_SELECTION
+                  ? describeRoomLocation(room, floors, buildings)
+                  : undefined
+              }
+              key={room.id}
+              label={
+                <>
+                  <span className="structure-room-number">{room.roomNumber}</span>{" "}
+                  {room.roomName}
+                </>
+              }
+            />
+          ))}
+          {!visibleRooms.length && !isLoading ? (
+            <li className="list-group-item structure-empty">
+              {rooms.length
+                ? "Keine Räume in dieser Auswahl."
+                : "Noch keine Räume vorhanden."}
+            </li>
+          ) : null}
+        </StructureColumn>
+      </div>
+
+      {dialog?.kind === "building" ? (
+        <FormModal
+          isSaving={isSaving}
+          onClose={() => setDialog(null)}
+          onSubmit={handleSaveBuilding}
+          submitDisabled={!dialogName.trim()}
+          submitLabel={dialog.building ? "Änderungen speichern" : "Gebäude hinzufügen"}
+          title={dialog.building ? "Gebäude bearbeiten" : "Gebäude hinzufügen"}
+        >
+          <label className="form-label" htmlFor="building-name">
+            Bezeichnung
+          </label>
+          <input
+            autoFocus
+            className="form-control"
+            id="building-name"
+            maxLength={200}
+            onChange={(event) => setDialogName(event.target.value)}
+            placeholder="z. B. Haus A"
+            required
+            value={dialogName}
+          />
+        </FormModal>
+      ) : null}
+
+      {dialog?.kind === "floor" ? (
+        <FormModal
+          isSaving={isSaving}
+          onClose={() => setDialog(null)}
+          onSubmit={handleSaveFloor}
+          submitDisabled={!dialogName.trim()}
+          submitLabel={dialog.floor ? "Änderungen speichern" : "Etage hinzufügen"}
+          title={dialog.floor ? "Etage bearbeiten" : "Etage hinzufügen"}
+        >
+          <div className="row g-3">
+            <div className="col-12 col-md-6">
+              <label className="form-label" htmlFor="floor-name">
+                Bezeichnung
+              </label>
+              <input
+                autoFocus
+                className="form-control"
+                id="floor-name"
+                maxLength={200}
+                onChange={(event) => setDialogName(event.target.value)}
+                placeholder="z. B. EG"
+                required
+                value={dialogName}
+              />
+            </div>
+            <div className="col-12 col-md-6">
+              <label className="form-label" htmlFor="floor-building">
+                Gebäude
+              </label>
+              <select
+                className="form-select"
+                id="floor-building"
+                onChange={(event) => setDialogBuildingId(event.target.value)}
+                value={dialogBuildingId}
+              >
+                <option value="">{UNASSIGNED_BUILDING_LABEL}</option>
+                {buildings.map((building) => (
+                  <option key={building.id} value={building.id}>
+                    {building.name}
+                  </option>
+                ))}
+              </select>
+            </div>
+          </div>
+        </FormModal>
+      ) : null}
+
+      {dialog?.kind === "room" ? (
+        <RoomModal
+          buildings={buildings}
+          floors={floors}
+          initialRoom={dialog.room ?? undefined}
+          initialValues={
+            dialog.defaultFloorId ? { floorId: dialog.defaultFloorId } : undefined
+          }
+          isSaving={isSaving}
+          onClose={() => setDialog(null)}
+          onSave={handleSaveRoom}
+        />
+      ) : null}
+    </main>
+  );
+}
+
+function FloorGroupEntries({
+  children,
+  label,
+}: {
+  children: ReactNode;
+  label: string;
+}) {
+  return (
+    <>
+      {label ? (
+        <li className="list-group-item structure-group-label">
+          {label}
+        </li>
+      ) : null}
+      {children}
+    </>
+  );
+}

src/db/migrations/0007_board_info_and_document_logo.sql

@@ -0,0 +1,12 @@
+CREATE TABLE `document_branding_assets` (
+	`key` text PRIMARY KEY NOT NULL,
+	`mime_type` text NOT NULL,
+	`file_name` text,
+	`data` blob NOT NULL,
+	`updated_at` integer DEFAULT (unixepoch()) NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE `distribution_boards` ADD `board_number` text;--> statement-breakpoint
+ALTER TABLE `distribution_boards` ADD `location` text;--> statement-breakpoint
+ALTER TABLE `distribution_boards` ADD `fed_from` text;--> statement-breakpoint
+ALTER TABLE `distribution_boards` ADD `remark` text;

src/db/migrations/0008_project_cover_and_office_profile.sql

@@ -0,0 +1,10 @@
+CREATE TABLE `document_branding_settings` (
+	`key` text PRIMARY KEY NOT NULL,
+	`value` text NOT NULL,
+	`updated_at` integer DEFAULT (unixepoch()) NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE `projects` ADD `site_address` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `work_stage` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `project_lead` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `project_editor` text;

src/db/migrations/0009_buildings.sql

@@ -0,0 +1,9 @@
+CREATE TABLE `buildings` (
+	`id` text PRIMARY KEY NOT NULL,
+	`project_id` text NOT NULL,
+	`name` text NOT NULL,
+	`sort_order` integer DEFAULT 0 NOT NULL,
+	FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+ALTER TABLE `floors` ADD `building_id` text REFERENCES buildings(id) ON DELETE set null;

src/db/migrations/meta/_journal.json

@@ -50,6 +50,27 @@
       "when": 1786043080323,
       "tag": "0006_damp_skrulls",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "6",
+      "when": 1790411540872,
+      "tag": "0007_board_info_and_document_logo",
+      "breakpoints": true
+    },
+    {
+      "idx": 8,
+      "version": "6",
+      "when": 1790411560953,
+      "tag": "0008_project_cover_and_office_profile",
+      "breakpoints": true
+    },
+    {
+      "idx": 9,
+      "version": "6",
+      "when": 1790419185882,
+      "tag": "0009_buildings",
+      "breakpoints": true
     }
   ]
 }

src/db/repositories/building.repository.ts

@@ -0,0 +1,27 @@
+import { and, asc, eq } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import { buildings } from "../schema/buildings.js";
+
+export class BuildingRepository {
+  constructor(private readonly database: AppDatabase) {}
+
+  async listByProject(projectId: string) {
+    return this.database
+      .select()
+      .from(buildings)
+      .where(eq(buildings.projectId, projectId))
+      .orderBy(asc(buildings.sortOrder), asc(buildings.name));
+  }
+
+  async findById(projectId: string, buildingId: string) {
+    return (
+      this.database
+        .select()
+        .from(buildings)
+        .where(
+          and(eq(buildings.projectId, projectId), eq(buildings.id, buildingId))
+        )
+        .get() ?? null
+    );
+  }
+}

src/db/repositories/distribution-board-structure-project-command.repository.ts

@@ -388,10 +388,15 @@ function structureMatches(
 ) {
   const {
     simultaneityFactor,
+    boardNumber,
+    location,
+    fedFrom,
+    remark,
     ...actualDistributionBoard
   } = actual.board;
   if (
     simultaneityFactor !== 1 ||
+    [boardNumber, location, fedFrom, remark].some((value) => value !== null) ||
     !sameRecord(
       expected.distributionBoard,
       actualDistributionBoard

src/db/repositories/distribution-board-subtree-project-command.repository.ts

@@ -10,6 +10,7 @@ import {
 } from "../../domain/models/distribution-board-subtree-project-command.model.js";
 import {
   assertDistributionBoardSubtreeSnapshot,
+  normalizeDistributionBoardSubtreeSnapshot,
   type DistributionBoardSubtreeSnapshot,
 } from "../../domain/models/distribution-board-subtree-snapshot.model.js";
 import type {
@@ -63,19 +64,20 @@ export class DistributionBoardSubtreeProjectCommandRepository
     projectId: string,
     command: DistributionBoardSubtreeProjectCommand
   ) {
-    if (command.type === distributionBoardInsertSubtreeCommandType) {
+    const snapshot = normalizeDistributionBoardSubtreeSnapshot(
-      this.insert(database, projectId, command.payload.snapshot);
-      return createDistributionBoardDeleteSubtreeProjectCommand(
       command.payload.snapshot
     );
+    if (command.type === distributionBoardInsertSubtreeCommandType) {
+      this.insert(database, projectId, snapshot);
+      return createDistributionBoardDeleteSubtreeProjectCommand(snapshot);
     }
     if (command.type === distributionBoardDeleteSubtreeCommandType) {
       const current = this.captureFrom(
         database,
         projectId,
-        command.payload.snapshot.distributionBoard.id
+        snapshot.distributionBoard.id
       );
-      if (!sameSnapshot(current, command.payload.snapshot)) {
+      if (!sameSnapshot(current, snapshot)) {
         throw new Error(
           "Distribution-board subtree changed before deletion."
         );
@@ -97,9 +99,7 @@ export class DistributionBoardSubtreeProjectCommandRepository
           "Distribution-board subtree could not be deleted."
         );
       }
-      return createDistributionBoardInsertSubtreeProjectCommand(
+      return createDistributionBoardInsertSubtreeProjectCommand(snapshot);
-        command.payload.snapshot
-      );
     }
     throw new Error("Unsupported distribution-board subtree command.");
   }

src/db/repositories/document-branding.repository.ts

@@ -0,0 +1,86 @@
+import { eq, inArray } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import {
+  documentBrandingAssets,
+  type DocumentBrandingAsset,
+} from "../schema/document-branding-assets.js";
+import { documentBrandingSettings } from "../schema/document-branding-settings.js";
+
+// Plain repository without revision semantics: branding is global office
+// configuration, not a project mutation.
+export class DocumentBrandingRepository {
+  constructor(private readonly db: AppDatabase) {}
+
+  get(key: string): DocumentBrandingAsset | undefined {
+    return this.db
+      .select()
+      .from(documentBrandingAssets)
+      .where(eq(documentBrandingAssets.key, key))
+      .get();
+  }
+
+  upsert(asset: {
+    key: string;
+    mimeType: string;
+    fileName: string | null;
+    data: Buffer;
+  }): DocumentBrandingAsset {
+    const updatedAt = new Date();
+    return this.db
+      .insert(documentBrandingAssets)
+      .values({ ...asset, updatedAt })
+      .onConflictDoUpdate({
+        target: documentBrandingAssets.key,
+        set: {
+          mimeType: asset.mimeType,
+          fileName: asset.fileName,
+          data: asset.data,
+          updatedAt,
+        },
+      })
+      .returning()
+      .get();
+  }
+
+  delete(key: string): boolean {
+    return (
+      this.db
+        .delete(documentBrandingAssets)
+        .where(eq(documentBrandingAssets.key, key))
+        .run().changes > 0
+    );
+  }
+
+  getSettings<TKey extends string>(keys: readonly TKey[]): Record<TKey, string | null> {
+    const rows = this.db
+      .select()
+      .from(documentBrandingSettings)
+      .where(inArray(documentBrandingSettings.key, [...keys]))
+      .all();
+    return Object.fromEntries(
+      keys.map((key) => [key, rows.find((row) => row.key === key)?.value ?? null])
+    ) as Record<TKey, string | null>;
+  }
+
+  /** Stores the given values atomically; `null` removes a setting. */
+  setSettings(values: Record<string, string | null>) {
+    const updatedAt = new Date();
+    this.db.transaction((tx) => {
+      for (const [key, value] of Object.entries(values)) {
+        if (value === null) {
+          tx.delete(documentBrandingSettings)
+            .where(eq(documentBrandingSettings.key, key))
+            .run();
+        } else {
+          tx.insert(documentBrandingSettings)
+            .values({ key, value, updatedAt })
+            .onConflictDoUpdate({
+              target: documentBrandingSettings.key,
+              set: { value, updatedAt },
+            })
+            .run();
+        }
+      }
+    });
+  }
+}

src/db/repositories/project-location-structure-project-command.repository.ts

@@ -1,23 +1,34 @@
 import { and, eq } from "drizzle-orm";
 import {
+  assertProjectBuildingDeleteProjectCommand,
+  assertProjectBuildingInsertProjectCommand,
+  assertProjectBuildingUpdateProjectCommand,
   assertProjectFloorDeleteProjectCommand,
   assertProjectFloorInsertProjectCommand,
   assertProjectFloorUpdateProjectCommand,
   assertProjectRoomDeleteProjectCommand,
   assertProjectRoomInsertProjectCommand,
   assertProjectRoomUpdateProjectCommand,
+  createProjectBuildingDeleteProjectCommand,
+  createProjectBuildingInsertProjectCommand,
+  createProjectBuildingUpdateProjectCommand,
   createProjectFloorDeleteProjectCommand,
   createProjectFloorInsertProjectCommand,
   createProjectFloorUpdateProjectCommand,
   createProjectRoomDeleteProjectCommand,
   createProjectRoomInsertProjectCommand,
   createProjectRoomUpdateProjectCommand,
+  projectBuildingDeleteCommandType,
+  projectBuildingInsertCommandType,
+  projectBuildingUpdateCommandType,
   projectFloorDeleteCommandType,
   projectFloorInsertCommandType,
   projectFloorUpdateCommandType,
   projectRoomDeleteCommandType,
   projectRoomInsertCommandType,
   projectRoomUpdateCommandType,
+  upgradeProjectFloorCommand,
+  type ProjectBuildingSnapshot,
   type ProjectFloorSnapshot,
   type ProjectLocationStructureProjectCommand,
   type ProjectRoomSnapshot,
@@ -27,6 +38,7 @@ import type {
   ProjectLocationStructureProjectCommandStore,
 } from "../../domain/ports/project-location-structure-project-command.store.js";
 import type { AppDatabase } from "../database-context.js";
+import { buildings } from "../schema/buildings.js";
 import { circuitDeviceRows } from "../schema/circuit-device-rows.js";
 import { floors } from "../schema/floors.js";
 import { distributionBoards } from "../schema/distribution-boards.js";
@@ -40,11 +52,14 @@ export class ProjectLocationStructureProjectCommandRepository
   constructor(private readonly database: AppDatabase) {}
 
   execute(input: ExecuteProjectLocationStructureCommandInput) {
+    // Forward and inverse are persisted with one schema version, so a
+    // version 1 floor command from older history is upgraded first.
+    const command = toCurrentCommandVersion(input.command);
     return executeProjectCommandTransaction(
       this.database,
-      input,
+      { ...input, command },
       (tx) =>
-        this.applyCommand(tx, input.projectId, input.command)
+        this.applyCommand(tx, input.projectId, command)
     );
   }
 
@@ -54,23 +69,43 @@ export class ProjectLocationStructureProjectCommandRepository
     command: ProjectLocationStructureProjectCommand
   ): ProjectLocationStructureProjectCommand {
     switch (command.type) {
-      case projectFloorInsertCommandType:
+      case projectBuildingInsertCommandType:
+        assertProjectBuildingInsertProjectCommand(command);
+        return this.insertBuilding(database, projectId, command.payload.building);
+      case projectBuildingDeleteCommandType:
+        assertProjectBuildingDeleteProjectCommand(command);
+        return this.deleteBuilding(database, projectId, command.payload.building);
+      case projectBuildingUpdateCommandType:
+        assertProjectBuildingUpdateProjectCommand(command);
+        return this.updateBuilding(
+          database,
+          projectId,
+          command.payload.expected,
+          command.payload.target
+        );
+      case projectFloorInsertCommandType: {
         assertProjectFloorInsertProjectCommand(command);
+        const current = upgradeProjectFloorCommand(command);
         return this.insertFloor(
           database,
           projectId,
-          command.payload.floor
+          current.payload.floor
         );
-      case projectFloorDeleteCommandType:
+      }
+      case projectFloorDeleteCommandType: {
         assertProjectFloorDeleteProjectCommand(command);
+        const current = upgradeProjectFloorCommand(command);
         return this.deleteFloor(
           database,
           projectId,
-          command.payload.floor
+          current.payload.floor
         );
-      case projectFloorUpdateCommandType:
+      }
+      case projectFloorUpdateCommandType: {
         assertProjectFloorUpdateProjectCommand(command);
-        return this.updateFloor(database, projectId, command.payload.expected, command.payload.target);
+        const current = upgradeProjectFloorCommand(command);
+        return this.updateFloor(database, projectId, current.payload.expected, current.payload.target);
+      }
       case projectRoomInsertCommandType:
         assertProjectRoomInsertProjectCommand(command);
         return this.insertRoom(
@@ -100,6 +135,7 @@ export class ProjectLocationStructureProjectCommandRepository
     if (floor.projectId !== projectId) {
       throw new Error("Project-floor snapshot does not belong to project.");
     }
+    this.assertBuildingInProject(database, projectId, floor.buildingId);
     const existing = database
       .select({ id: floors.id })
       .from(floors)
@@ -167,6 +203,104 @@ export class ProjectLocationStructureProjectCommandRepository
     return createProjectFloorInsertProjectCommand(expected);
   }
 
+  private insertBuilding(
+    database: AppDatabase,
+    projectId: string,
+    building: ProjectBuildingSnapshot
+  ) {
+    this.assertProjectExists(database, projectId);
+    if (building.projectId !== projectId) {
+      throw new Error("Project-building snapshot does not belong to project.");
+    }
+    const existing = database
+      .select({ id: buildings.id })
+      .from(buildings)
+      .where(eq(buildings.id, building.id))
+      .get();
+    if (existing) {
+      throw new Error("Project-building id already exists.");
+    }
+    database.insert(buildings).values(building).run();
+    return createProjectBuildingDeleteProjectCommand(building);
+  }
+
+  private deleteBuilding(
+    database: AppDatabase,
+    projectId: string,
+    expected: ProjectBuildingSnapshot
+  ) {
+    const persisted = database
+      .select()
+      .from(buildings)
+      .where(and(eq(buildings.id, expected.id), eq(buildings.projectId, projectId)))
+      .get();
+    if (!persisted || !sameRecord(expected, persisted)) {
+      throw new Error("Project building changed before deletion.");
+    }
+    const referencedFloor = database
+      .select({ id: floors.id })
+      .from(floors)
+      .where(eq(floors.buildingId, expected.id))
+      .limit(1)
+      .get();
+    if (referencedFloor) {
+      throw new Error(
+        "Das Gebäude kann nicht gelöscht werden, solange Etagen zugeordnet sind."
+      );
+    }
+    const deleted = database
+      .delete(buildings)
+      .where(and(eq(buildings.id, expected.id), eq(buildings.projectId, projectId)))
+      .run();
+    if (deleted.changes !== 1) {
+      throw new Error("Project building could not be deleted.");
+    }
+    return createProjectBuildingInsertProjectCommand(expected);
+  }
+
+  private updateBuilding(
+    database: AppDatabase,
+    projectId: string,
+    expected: ProjectBuildingSnapshot,
+    target: ProjectBuildingSnapshot
+  ) {
+    const persisted = database
+      .select()
+      .from(buildings)
+      .where(and(eq(buildings.id, expected.id), eq(buildings.projectId, projectId)))
+      .get();
+    if (!persisted || !sameRecord(expected, persisted)) {
+      throw new Error("Project building changed before update.");
+    }
+    const updated = database
+      .update(buildings)
+      .set({ name: target.name })
+      .where(and(eq(buildings.id, expected.id), eq(buildings.projectId, projectId)))
+      .run();
+    if (updated.changes !== 1) {
+      throw new Error("Das Gebäude konnte nicht aktualisiert werden.");
+    }
+    return createProjectBuildingUpdateProjectCommand(target, expected);
+  }
+
+  private assertBuildingInProject(
+    database: AppDatabase,
+    projectId: string,
+    buildingId: string | null
+  ) {
+    if (buildingId === null) {
+      return;
+    }
+    const building = database
+      .select({ id: buildings.id })
+      .from(buildings)
+      .where(and(eq(buildings.id, buildingId), eq(buildings.projectId, projectId)))
+      .get();
+    if (!building) {
+      throw new Error("Project floor references a foreign building.");
+    }
+  }
+
   private insertRoom(
     database: AppDatabase,
     projectId: string,
@@ -217,9 +351,10 @@ export class ProjectLocationStructureProjectCommandRepository
     if (!persisted || !sameRecord(expected, persisted)) {
       throw new Error("Project floor changed before update.");
     }
+    this.assertBuildingInProject(database, projectId, target.buildingId);
     const updated = database
       .update(floors)
-      .set({ name: target.name })
+      .set({ name: target.name, buildingId: target.buildingId })
       .where(and(eq(floors.id, expected.id), eq(floors.projectId, projectId)))
       .run();
     if (updated.changes !== 1) {
@@ -326,6 +461,24 @@ export class ProjectLocationStructureProjectCommandRepository
   }
 }
 
+function toCurrentCommandVersion(
+  command: ProjectLocationStructureProjectCommand
+): ProjectLocationStructureProjectCommand {
+  switch (command.type) {
+    case projectFloorInsertCommandType:
+      assertProjectFloorInsertProjectCommand(command);
+      return upgradeProjectFloorCommand(command);
+    case projectFloorDeleteCommandType:
+      assertProjectFloorDeleteProjectCommand(command);
+      return upgradeProjectFloorCommand(command);
+    case projectFloorUpdateCommandType:
+      assertProjectFloorUpdateProjectCommand(command);
+      return upgradeProjectFloorCommand(command);
+    default:
+      return command;
+  }
+}
+
 function sameRecord(
   expected: object,
   actual: object

src/db/repositories/project-settings-project-command.repository.ts

@@ -1,9 +1,12 @@
 import { and, eq, isNotNull } from "drizzle-orm";
 import {
   assertProjectSettingsUpdateProjectCommand,
+  baselineProjectSettingsUpdateCommandSchemaVersion,
   createProjectSettingsUpdateProjectCommand,
+  withoutCoverProjectSettingsUpdateCommandSchemaVersion,
   type ProjectSettingsValues,
 } from "../../domain/models/project-settings-project-command.model.js";
+import { projectCoverFields } from "../../shared/constants/project-cover.js";
 import type {
   ExecuteProjectSettingsUpdateCommandInput,
   ProjectSettingsProjectCommandStore,
@@ -40,13 +43,27 @@ export class ProjectSettingsProjectCommandRepository
     if (!current) {
       throw new Error("Project not found.");
     }
+    const currentCoverValues = {
+      siteAddress: current.siteAddress,
+      workStage: current.workStage,
+      projectLead: current.projectLead,
+      projectEditor: current.projectEditor,
+    };
+    // Older command versions do not carry every value; missing values keep
+    // the current project state and are therefore also absent from the
+    // inverse of the same version.
+    const command = input.command;
     const target: ProjectSettingsValues =
-      input.command.schemaVersion === 1
+      command.schemaVersion === baselineProjectSettingsUpdateCommandSchemaVersion
         ? {
-            ...input.command.payload,
+            ...command.payload,
             isPublicBuilding: current.isPublicBuilding,
+            ...currentCoverValues,
           }
-        : input.command.payload;
+        : command.schemaVersion ===
+            withoutCoverProjectSettingsUpdateCommandSchemaVersion
+          ? { ...command.payload, ...currentCoverValues }
+          : command.payload;
     if (projectSettingsEqual(current, target)) {
       throw new Error("Project settings did not change.");
     }
@@ -62,10 +79,14 @@ export class ProjectSettingsProjectCommandRepository
       threePhaseVoltageV: current.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         current.enabledDistributionBoardSupplyTypes,
+      ...currentCoverValues,
     };
     const inverse =
-      input.command.schemaVersion === 1
+      command.schemaVersion === baselineProjectSettingsUpdateCommandSchemaVersion
         ? createBaselineProjectSettingsUpdateCommand(inverseValues)
+        : command.schemaVersion ===
+            withoutCoverProjectSettingsUpdateCommandSchemaVersion
+          ? createWithoutCoverProjectSettingsUpdateCommand(inverseValues)
           : createProjectSettingsUpdateProjectCommand(inverseValues);
     assertDisabledSupplyTypesAreUnused(tx, input.projectId, target);
     const updated = tx
@@ -82,11 +103,32 @@ export class ProjectSettingsProjectCommandRepository
   }
 }
 
+function createWithoutCoverProjectSettingsUpdateCommand(
+  values: ProjectSettingsValues
+) {
+  return {
+    schemaVersion: withoutCoverProjectSettingsUpdateCommandSchemaVersion,
+    type: "project.update-settings" as const,
+    payload: {
+      name: values.name,
+      internalProjectNumber: values.internalProjectNumber,
+      externalProjectNumber: values.externalProjectNumber,
+      buildingOwner: values.buildingOwner,
+      description: values.description,
+      isPublicBuilding: values.isPublicBuilding,
+      singlePhaseVoltageV: values.singlePhaseVoltageV,
+      threePhaseVoltageV: values.threePhaseVoltageV,
+      enabledDistributionBoardSupplyTypes:
+        values.enabledDistributionBoardSupplyTypes,
+    },
+  };
+}
+
 function createBaselineProjectSettingsUpdateCommand(
   values: ProjectSettingsValues
 ) {
   return {
-    schemaVersion: 1 as const,
+    schemaVersion: baselineProjectSettingsUpdateCommandSchemaVersion,
     type: "project.update-settings" as const,
     payload: {
       name: values.name,
@@ -114,8 +156,9 @@ function projectSettingsEqual(
     current.description === target.description &&
     current.isPublicBuilding === target.isPublicBuilding &&
     current.singlePhaseVoltageV === target.singlePhaseVoltageV &&
-    current.threePhaseVoltageV === target.threePhaseVoltageV
+    current.threePhaseVoltageV === target.threePhaseVoltageV &&
-    && sameSupplyTypes(
+    projectCoverFields.every((field) => current[field] === target[field]) &&
+    sameSupplyTypes(
       current.enabledDistributionBoardSupplyTypes,
       target.enabledDistributionBoardSupplyTypes
     )

src/db/repositories/project-snapshot.repository.ts

@@ -5,6 +5,7 @@ import { ProjectSnapshotNameConflictError } from "../../domain/errors/project-sn
 import { createProjectStateRestoreCommand } from "../../domain/models/project-state-restore-command.model.js";
 import {
   deserializeProjectStateSnapshot,
+  isSupportedProjectStateSnapshotSchemaVersion,
   projectStateSnapshotSchemaVersion,
 } from "../../domain/models/project-state-snapshot.model.js";
 import type {
@@ -138,7 +139,7 @@ export class ProjectSnapshotRepository implements ProjectSnapshotStore {
     if (actualChecksum !== stored.payloadSha256) {
       throw new Error("Project snapshot checksum verification failed.");
     }
-    if (stored.schemaVersion !== projectStateSnapshotSchemaVersion) {
+    if (!isSupportedProjectStateSnapshotSchemaVersion(stored.schemaVersion)) {
       throw new Error("Project snapshot schema version is not supported.");
     }
     const targetState = deserializeProjectStateSnapshot(stored.payloadJson);

src/db/repositories/project-state-restore-command.repository.ts

@@ -21,6 +21,7 @@ import { circuits } from "../schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../schema/distribution-board-components.js";
 import { distributionBoards } from "../schema/distribution-boards.js";
+import { buildings } from "../schema/buildings.js";
 import { floors } from "../schema/floors.js";
 import { projectDevices } from "../schema/project-devices.js";
 import { projectChangeSets } from "../schema/project-change-sets.js";
@@ -164,6 +165,7 @@ function canonicalProjectState(state: ProjectStateSnapshot) {
       }))
     ),
     projectDevices: byId(state.projectDevices),
+    buildings: byId(state.buildings),
     floors: byId(state.floors),
     rooms: byId(state.rooms),
     externalCsvConfiguration: state.externalCsvConfiguration,
@@ -219,6 +221,10 @@ function replaceProjectState(
     .delete(floors)
     .where(eq(floors.projectId, state.project.id))
     .run();
+  database
+    .delete(buildings)
+    .where(eq(buildings.projectId, state.project.id))
+    .run();
 
   database
     .update(projects)
@@ -233,10 +239,15 @@ function replaceProjectState(
       threePhaseVoltageV: state.project.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         state.project.enabledDistributionBoardSupplyTypes,
+      siteAddress: state.project.siteAddress,
+      workStage: state.project.workStage,
+      projectLead: state.project.projectLead,
+      projectEditor: state.project.projectEditor,
     })
     .where(eq(projects.id, state.project.id))
     .run();
 
+  insertMany(database, buildings, state.buildings);
   insertMany(database, floors, state.floors);
   if (state.externalCsvConfiguration !== null) {
     database

src/db/repositories/project-state-snapshot.persistence.ts

@@ -15,6 +15,7 @@ import { circuits } from "../schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../schema/distribution-board-components.js";
 import { distributionBoards } from "../schema/distribution-boards.js";
+import { buildings } from "../schema/buildings.js";
 import { floors } from "../schema/floors.js";
 import { projectDevices } from "../schema/project-devices.js";
 import { projects } from "../schema/projects.js";
@@ -46,6 +47,10 @@ export function readProjectStateSnapshot(
       threePhaseVoltageV: projects.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         projects.enabledDistributionBoardSupplyTypes,
+      siteAddress: projects.siteAddress,
+      workStage: projects.workStage,
+      projectLead: projects.projectLead,
+      projectEditor: projects.projectEditor,
       currentRevision: projects.currentRevision,
     })
     .from(projects)
@@ -215,6 +220,12 @@ export function readProjectStateSnapshot(
     .where(eq(projectDevices.projectId, projectId))
     .orderBy(asc(projectDevices.displayName), asc(projectDevices.id))
     .all();
+  const buildingRows = database
+    .select()
+    .from(buildings)
+    .where(eq(buildings.projectId, projectId))
+    .orderBy(asc(buildings.sortOrder), asc(buildings.id))
+    .all();
   const floorRows = database
     .select()
     .from(floors)
@@ -249,6 +260,10 @@ export function readProjectStateSnapshot(
       threePhaseVoltageV: project.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         project.enabledDistributionBoardSupplyTypes,
+      siteAddress: project.siteAddress,
+      workStage: project.workStage,
+      projectLead: project.projectLead,
+      projectEditor: project.projectEditor,
     },
     distributionBoards: boardRows,
     externalCsvConfiguration,
@@ -265,6 +280,7 @@ export function readProjectStateSnapshot(
       deviceRows: deviceRowsByCircuit.get(circuit.id) ?? [],
     })),
     projectDevices: projectDeviceRows,
+    buildings: buildingRows,
     floors: floorRows,
     rooms: roomRows,
   });

src/db/repositories/project-transfer.repository.ts

@@ -16,6 +16,7 @@ import { circuits } from "../schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../schema/distribution-board-components.js";
 import { distributionBoards } from "../schema/distribution-boards.js";
+import { buildings } from "../schema/buildings.js";
 import { floors } from "../schema/floors.js";
 import { projectDevices } from "../schema/project-devices.js";
 import { projects } from "../schema/projects.js";
@@ -127,6 +128,7 @@ function insertProjectState(
       .values(state.externalCsvConfiguration)
       .run();
   }
+  insertMany(database, buildings, state.buildings);
   insertMany(database, floors, state.floors);
   insertMany(database, rooms, state.rooms);
   insertMany(database, projectDevices, state.projectDevices);

src/db/repositories/project.repository.ts

@@ -31,6 +31,10 @@ export class ProjectRepository {
       enabledDistributionBoardSupplyTypes: [
         ...defaultDistributionBoardSupplyTypes,
       ],
+      siteAddress: null,
+      workStage: null,
+      projectLead: null,
+      projectEditor: null,
       currentRevision: 0,
     };
     await db.insert(projects).values(project);

src/db/schema/buildings.ts

@@ -0,0 +1,11 @@
+import { integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
+import { projects } from "./projects.js";
+
+export const buildings = sqliteTable("buildings", {
+  id: text("id").primaryKey(),
+  projectId: text("project_id")
+    .notNull()
+    .references(() => projects.id, { onDelete: "cascade" }),
+  name: text("name").notNull(),
+  sortOrder: integer("sort_order").notNull().default(0),
+});

src/db/schema/distribution-boards.ts

@@ -16,5 +16,9 @@ export const distributionBoards = sqliteTable("distribution_boards", {
   simultaneityFactor: real("simultaneity_factor")
     .notNull()
     .default(1),
+  boardNumber: text("board_number"),
+  location: text("location"),
+  fedFrom: text("fed_from"),
+  remark: text("remark"),
 });
 

src/db/schema/document-branding-assets.ts

@@ -0,0 +1,18 @@
+import { sql } from "drizzle-orm";
+import { blob, integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
+
+// Office-wide branding for printed documents (currently only the logo shown
+// on the cover page and plan title blocks). Global application data, not part
+// of any project: it is deliberately outside project revisions, logical
+// project snapshots and project transfer.
+export const documentBrandingAssets = sqliteTable("document_branding_assets", {
+  key: text("key").primaryKey(),
+  mimeType: text("mime_type").notNull(),
+  fileName: text("file_name"),
+  data: blob("data", { mode: "buffer" }).notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" })
+    .notNull()
+    .default(sql`(unixepoch())`),
+});
+
+export type DocumentBrandingAsset = typeof documentBrandingAssets.$inferSelect;

src/db/schema/document-branding-settings.ts

@@ -0,0 +1,13 @@
+import { sql } from "drizzle-orm";
+import { integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
+
+// Office-wide text settings for printed documents (e.g. office name and
+// address on the cover page). Global application data like
+// document_branding_assets: outside project revisions, snapshots and transfer.
+export const documentBrandingSettings = sqliteTable("document_branding_settings", {
+  key: text("key").primaryKey(),
+  value: text("value").notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" })
+    .notNull()
+    .default(sql`(unixepoch())`),
+});

src/db/schema/floors.ts

@@ -1,4 +1,5 @@
 import { integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
+import { buildings } from "./buildings.js";
 import { projects } from "./projects.js";
 
 export const floors = sqliteTable("floors", {
@@ -8,4 +9,9 @@ export const floors = sqliteTable("floors", {
     .references(() => projects.id, { onDelete: "cascade" }),
   name: text("name").notNull(),
   sortOrder: integer("sort_order").notNull().default(0),
+  // Optional parent building. Floors created before buildings existed stay
+  // without one and are shown as "Ohne Gebäude".
+  buildingId: text("building_id").references(() => buildings.id, {
+    onDelete: "set null",
+  }),
 });

src/db/schema/projects.ts

@@ -21,5 +21,9 @@ export const projects = sqliteTable("projects", {
     .$type<DistributionBoardSupplyType[]>()
     .notNull()
     .default(sql`'["AV","SV","EV","USV","MSR","SiBe"]'`),
+  siteAddress: text("site_address"),
+  workStage: text("work_stage"),
+  projectLead: text("project_lead"),
+  projectEditor: text("project_editor"),
   currentRevision: integer("current_revision").notNull().default(0),
 });

src/domain/models/distribution-board-project-command.model.ts

@@ -1,14 +1,21 @@
 import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardInfoFields,
   distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
   type DistributionBoardSupplyType,
 } from "../../shared/constants/distribution-board.js";
 import type { SerializedProjectCommand } from "./project-command.model.js";
 
 export const distributionBoardUpdateCommandType =
   "distribution-board.update" as const;
+// The info-card fields were added additively to schema version 1: every
+// previously stored command remains valid, and the inverse is still derived
+// from the persisted row for exactly the changed fields.
 export const distributionBoardUpdateCommandSchemaVersion = 1 as const;
 
-export interface DistributionBoardUpdateValues {
+export interface DistributionBoardUpdateValues
+  extends Record<DistributionBoardInfoField, string | null> {
   floorId: string | null;
   supplyType: DistributionBoardSupplyType | null;
   simultaneityFactor: number;
@@ -82,16 +89,20 @@ export function assertDistributionBoardUpdateProjectCommand(
   for (const change of changes) {
     if (
       !isPlainObject(change) ||
+      typeof change.field !== "string" ||
       (change.field !== "floorId" &&
         change.field !== "supplyType" &&
-        change.field !== "simultaneityFactor") ||
+        change.field !== "simultaneityFactor" &&
+        !isInfoField(change.field)) ||
       seen.has(change.field)
     ) {
       throw new Error(
         "Distribution-board update contains an invalid or duplicate field."
       );
     }
-    if (change.field === "floorId") {
+    if (isInfoField(change.field)) {
+      assertInfoFieldValue(change.field, change.value);
+    } else if (change.field === "floorId") {
       if (
         change.value !== null &&
         (typeof change.value !== "string" || !change.value.trim())
@@ -121,6 +132,29 @@ export function assertDistributionBoardUpdateProjectCommand(
   }
 }
 
+function isInfoField(field: string): field is DistributionBoardInfoField {
+  return (distributionBoardInfoFields as readonly string[]).includes(field);
+}
+
+function assertInfoFieldValue(
+  field: DistributionBoardInfoField,
+  value: unknown
+) {
+  if (value === null) {
+    return;
+  }
+  if (
+    typeof value !== "string" ||
+    !value.trim() ||
+    value !== value.trim() ||
+    value.length > distributionBoardInfoFieldMaxLengths[field]
+  ) {
+    throw new Error(
+      `${field} must be a trimmed, non-empty string of at most ${distributionBoardInfoFieldMaxLengths[field]} characters or null.`
+    );
+  }
+}
+
 function isPlainObject(value: unknown): value is Record<string, unknown> {
   return value !== null && typeof value === "object" && !Array.isArray(value);
 }

src/domain/models/distribution-board-subtree-snapshot.model.ts

@@ -10,7 +10,9 @@ import {
   type DistributionBoardComponentRole,
 } from "../../shared/constants/distribution-board-component.js";
 import {
+  distributionBoardInfoFields,
   distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
   type DistributionBoardSupplyType,
 } from "../../shared/constants/distribution-board.js";
 import type {
@@ -72,7 +74,7 @@ export interface DistributionBoardSubtreeSnapshot {
     floorId: string | null;
     supplyType: DistributionBoardSupplyType | null;
     simultaneityFactor: number;
-  };
+  } & Record<DistributionBoardInfoField, string | null>;
   circuitList: {
     id: string;
     projectId: string;
@@ -169,6 +171,22 @@ export function cloneDistributionBoardSubtree(
   return clone;
 }
 
+/**
+ * Subtree commands stored before the board info fields existed carry no
+ * info values. They are equivalent to a board whose info fields are empty,
+ * so comparisons against a freshly captured subtree and re-inserts stay
+ * exact.
+ */
+export function normalizeDistributionBoardSubtreeSnapshot(
+  snapshot: DistributionBoardSubtreeSnapshot
+): DistributionBoardSubtreeSnapshot {
+  const board = { ...snapshot.distributionBoard };
+  for (const field of distributionBoardInfoFields) {
+    board[field] = board[field] ?? null;
+  }
+  return { ...snapshot, distributionBoard: board };
+}
+
 export function assertDistributionBoardSubtreeSnapshot(
   value: unknown
 ): asserts value is DistributionBoardSubtreeSnapshot {
@@ -204,6 +222,11 @@ export function assertDistributionBoardSubtreeSnapshot(
   if (board.simultaneityFactor < 0 || board.simultaneityFactor > 1) {
     throw new Error("Distribution-board simultaneity factor is invalid.");
   }
+  for (const field of distributionBoardInfoFields) {
+    if (board[field] !== undefined) {
+      assertNullableString(board[field], `distributionBoard.${field}`);
+    }
+  }
   for (const field of [
     "id",
     "projectId",

src/domain/models/project-location-structure-project-command.model.ts

@@ -1,21 +1,42 @@
 import crypto from "node:crypto";
 import type { SerializedProjectCommand } from "./project-command.model.js";
 
+export const projectBuildingInsertCommandType = "project-building.insert" as const;
+export const projectBuildingDeleteCommandType = "project-building.delete" as const;
+export const projectBuildingUpdateCommandType = "project-building.update" as const;
 export const projectFloorInsertCommandType = "project-floor.insert" as const;
 export const projectFloorDeleteCommandType = "project-floor.delete" as const;
 export const projectFloorUpdateCommandType = "project-floor.update" as const;
 export const projectRoomInsertCommandType = "project-room.insert" as const;
 export const projectRoomDeleteCommandType = "project-room.delete" as const;
 export const projectRoomUpdateCommandType = "project-room.update" as const;
+/** Room commands, building commands and legacy floor commands. */
 export const projectLocationStructureCommandSchemaVersion = 1 as const;
+/**
+ * Floor commands carry `buildingId` since version 2. Version 1 floor
+ * commands stay executable from persisted history: they were recorded before
+ * buildings existed, so they are upgraded with `buildingId = null`.
+ */
+export const projectFloorCommandSchemaVersion = 2 as const;
+const legacyProjectFloorCommandSchemaVersion = 1 as const;
+
+export interface ProjectBuildingSnapshot {
+  id: string;
+  projectId: string;
+  name: string;
+  sortOrder: number;
+}
 
 export interface ProjectFloorSnapshot {
   id: string;
   projectId: string;
   name: string;
   sortOrder: number;
+  buildingId: string | null;
 }
 
+export type LegacyProjectFloorSnapshot = Omit<ProjectFloorSnapshot, "buildingId">;
+
 export interface ProjectRoomSnapshot {
   id: string;
   projectId: string;
@@ -24,39 +45,93 @@ export interface ProjectRoomSnapshot {
   roomName: string;
 }
 
+interface ProjectBuildingStructureCommandPayload {
+  building: ProjectBuildingSnapshot;
+}
+
 interface ProjectFloorStructureCommandPayload {
   floor: ProjectFloorSnapshot;
 }
 
+interface LegacyProjectFloorStructureCommandPayload {
+  floor: LegacyProjectFloorSnapshot;
+}
+
 interface ProjectRoomStructureCommandPayload {
   room: ProjectRoomSnapshot;
 }
 
+interface ProjectBuildingUpdateCommandPayload {
+  expected: ProjectBuildingSnapshot;
+  target: ProjectBuildingSnapshot;
+}
+
 interface ProjectFloorUpdateCommandPayload {
   expected: ProjectFloorSnapshot;
   target: ProjectFloorSnapshot;
 }
 
+interface LegacyProjectFloorUpdateCommandPayload {
+  expected: LegacyProjectFloorSnapshot;
+  target: LegacyProjectFloorSnapshot;
+}
+
 interface ProjectRoomUpdateCommandPayload {
   expected: ProjectRoomSnapshot;
   target: ProjectRoomSnapshot;
 }
 
+export interface ProjectBuildingInsertProjectCommand
+  extends SerializedProjectCommand<ProjectBuildingStructureCommandPayload> {
+  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  type: typeof projectBuildingInsertCommandType;
+}
+
+export interface ProjectBuildingDeleteProjectCommand
+  extends SerializedProjectCommand<ProjectBuildingStructureCommandPayload> {
+  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  type: typeof projectBuildingDeleteCommandType;
+}
+
+export interface ProjectBuildingUpdateProjectCommand
+  extends SerializedProjectCommand<ProjectBuildingUpdateCommandPayload> {
+  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  type: typeof projectBuildingUpdateCommandType;
+}
+
 export interface ProjectFloorInsertProjectCommand
   extends SerializedProjectCommand<ProjectFloorStructureCommandPayload> {
-  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  schemaVersion: typeof projectFloorCommandSchemaVersion;
   type: typeof projectFloorInsertCommandType;
 }
 
 export interface ProjectFloorDeleteProjectCommand
   extends SerializedProjectCommand<ProjectFloorStructureCommandPayload> {
-  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  schemaVersion: typeof projectFloorCommandSchemaVersion;
   type: typeof projectFloorDeleteCommandType;
 }
 
 export interface ProjectFloorUpdateProjectCommand
   extends SerializedProjectCommand<ProjectFloorUpdateCommandPayload> {
-  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
+  schemaVersion: typeof projectFloorCommandSchemaVersion;
+  type: typeof projectFloorUpdateCommandType;
+}
+
+export interface LegacyProjectFloorInsertProjectCommand
+  extends SerializedProjectCommand<LegacyProjectFloorStructureCommandPayload> {
+  schemaVersion: typeof legacyProjectFloorCommandSchemaVersion;
+  type: typeof projectFloorInsertCommandType;
+}
+
+export interface LegacyProjectFloorDeleteProjectCommand
+  extends SerializedProjectCommand<LegacyProjectFloorStructureCommandPayload> {
+  schemaVersion: typeof legacyProjectFloorCommandSchemaVersion;
+  type: typeof projectFloorDeleteCommandType;
+}
+
+export interface LegacyProjectFloorUpdateProjectCommand
+  extends SerializedProjectCommand<LegacyProjectFloorUpdateCommandPayload> {
+  schemaVersion: typeof legacyProjectFloorCommandSchemaVersion;
   type: typeof projectFloorUpdateCommandType;
 }
 
@@ -79,23 +154,46 @@ export interface ProjectRoomUpdateProjectCommand
 }
 
 export type ProjectLocationStructureProjectCommand =
+  | ProjectBuildingInsertProjectCommand
+  | ProjectBuildingDeleteProjectCommand
+  | ProjectBuildingUpdateProjectCommand
   | ProjectFloorInsertProjectCommand
   | ProjectFloorDeleteProjectCommand
   | ProjectFloorUpdateProjectCommand
+  | LegacyProjectFloorInsertProjectCommand
+  | LegacyProjectFloorDeleteProjectCommand
+  | LegacyProjectFloorUpdateProjectCommand
   | ProjectRoomInsertProjectCommand
   | ProjectRoomDeleteProjectCommand
   | ProjectRoomUpdateProjectCommand;
 
-export function createProjectFloorSnapshot(
+export function createProjectBuildingSnapshot(
   projectId: string,
   name: string,
   sortOrder: number
+): ProjectBuildingSnapshot {
+  const building: ProjectBuildingSnapshot = {
+    id: crypto.randomUUID(),
+    projectId,
+    name: name.trim(),
+    sortOrder,
+  };
+  assertProjectBuildingSnapshot(building);
+  return building;
+}
+
+export function createProjectFloorSnapshot(
+  projectId: string,
+  name: string,
+  sortOrder: number,
+  buildingId: string | null = null
 ): ProjectFloorSnapshot {
   const floor: ProjectFloorSnapshot = {
     id: crypto.randomUUID(),
     projectId,
     name: name.trim(),
     sortOrder,
+    buildingId: buildingId?.trim() || null,
   };
   assertProjectFloorSnapshot(floor);
   return floor;
@@ -120,12 +218,46 @@ export function createProjectRoomSnapshot(
   return room;
 }
 
+export function createProjectBuildingInsertProjectCommand(
+  building: ProjectBuildingSnapshot
+): ProjectBuildingInsertProjectCommand {
+  assertProjectBuildingSnapshot(building);
+  return {
+    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    type: projectBuildingInsertCommandType,
+    payload: { building },
+  };
+}
+
+export function createProjectBuildingDeleteProjectCommand(
+  building: ProjectBuildingSnapshot
+): ProjectBuildingDeleteProjectCommand {
+  assertProjectBuildingSnapshot(building);
+  return {
+    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    type: projectBuildingDeleteCommandType,
+    payload: { building },
+  };
+}
+
+export function createProjectBuildingUpdateProjectCommand(
+  expected: ProjectBuildingSnapshot,
+  target: ProjectBuildingSnapshot
+): ProjectBuildingUpdateProjectCommand {
+  assertMatchingBuildingUpdate(expected, target);
+  return {
+    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    type: projectBuildingUpdateCommandType,
+    payload: { expected, target },
+  };
+}
+
 export function createProjectFloorInsertProjectCommand(
   floor: ProjectFloorSnapshot
 ): ProjectFloorInsertProjectCommand {
   assertProjectFloorSnapshot(floor);
   return {
-    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    schemaVersion: projectFloorCommandSchemaVersion,
     type: projectFloorInsertCommandType,
     payload: { floor },
   };
@@ -136,7 +268,7 @@ export function createProjectFloorDeleteProjectCommand(
 ): ProjectFloorDeleteProjectCommand {
   assertProjectFloorSnapshot(floor);
   return {
-    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    schemaVersion: projectFloorCommandSchemaVersion,
     type: projectFloorDeleteCommandType,
     payload: { floor },
   };
@@ -170,7 +302,7 @@ export function createProjectFloorUpdateProjectCommand(
 ): ProjectFloorUpdateProjectCommand {
   assertMatchingFloorUpdate(expected, target);
   return {
-    schemaVersion: projectLocationStructureCommandSchemaVersion,
+    schemaVersion: projectFloorCommandSchemaVersion,
     type: projectFloorUpdateCommandType,
     payload: { expected, target },
   };
@@ -188,9 +320,43 @@ export function createProjectRoomUpdateProjectCommand(
   };
 }
 
+export function assertProjectBuildingInsertProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is ProjectBuildingInsertProjectCommand {
+  assertProjectBuildingStructureProjectCommand(
+    command,
+    projectBuildingInsertCommandType
+  );
+}
+
+export function assertProjectBuildingDeleteProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is ProjectBuildingDeleteProjectCommand {
+  assertProjectBuildingStructureProjectCommand(
+    command,
+    projectBuildingDeleteCommandType
+  );
+}
+
+export function assertProjectBuildingUpdateProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is ProjectBuildingUpdateProjectCommand {
+  if (
+    command.schemaVersion !== projectLocationStructureCommandSchemaVersion ||
+    command.type !== projectBuildingUpdateCommandType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 2
+  ) {
+    throw new Error("Unsupported project-building update command.");
+  }
+  assertMatchingBuildingUpdate(command.payload.expected, command.payload.target);
+}
+
 export function assertProjectFloorInsertProjectCommand(
   command: SerializedProjectCommand<unknown>
-): asserts command is ProjectFloorInsertProjectCommand {
+): asserts command is
+  | ProjectFloorInsertProjectCommand
+  | LegacyProjectFloorInsertProjectCommand {
   assertProjectFloorStructureProjectCommand(
     command,
     projectFloorInsertCommandType
@@ -199,7 +365,9 @@ export function assertProjectFloorInsertProjectCommand(
 
 export function assertProjectFloorDeleteProjectCommand(
   command: SerializedProjectCommand<unknown>
-): asserts command is ProjectFloorDeleteProjectCommand {
+): asserts command is
+  | ProjectFloorDeleteProjectCommand
+  | LegacyProjectFloorDeleteProjectCommand {
   assertProjectFloorStructureProjectCommand(
     command,
     projectFloorDeleteCommandType
@@ -226,15 +394,26 @@ export function assertProjectRoomDeleteProjectCommand(
 
 export function assertProjectFloorUpdateProjectCommand(
   command: SerializedProjectCommand<unknown>
-): asserts command is ProjectFloorUpdateProjectCommand {
+): asserts command is
+  | ProjectFloorUpdateProjectCommand
+  | LegacyProjectFloorUpdateProjectCommand {
   if (
-    command.schemaVersion !== projectLocationStructureCommandSchemaVersion ||
     command.type !== projectFloorUpdateCommandType ||
     !isPlainObject(command.payload) ||
     Object.keys(command.payload).length !== 2
   ) {
     throw new Error("Unsupported project-floor update command.");
   }
+  if (command.schemaVersion === legacyProjectFloorCommandSchemaVersion) {
+    assertMatchingFloorUpdate(
+      upgradeLegacyFloorSnapshot(command.payload.expected),
+      upgradeLegacyFloorSnapshot(command.payload.target)
+    );
+    return;
+  }
+  if (command.schemaVersion !== projectFloorCommandSchemaVersion) {
+    throw new Error("Unsupported project-floor update command.");
+  }
   assertMatchingFloorUpdate(command.payload.expected, command.payload.target);
 }
 
@@ -252,6 +431,68 @@ export function assertProjectRoomUpdateProjectCommand(
   assertMatchingRoomUpdate(command.payload.expected, command.payload.target);
 }
 
+/**
+ * Upgrades a (validated) floor command of any supported version to the
+ * current version. Version 1 commands predate buildings; their floors had no
+ * building, so `buildingId` becomes null.
+ */
+export function upgradeProjectFloorCommand(
+  command:
+    | ProjectFloorInsertProjectCommand
+    | LegacyProjectFloorInsertProjectCommand
+): ProjectFloorInsertProjectCommand;
+export function upgradeProjectFloorCommand(
+  command:
+    | ProjectFloorDeleteProjectCommand
+    | LegacyProjectFloorDeleteProjectCommand
+): ProjectFloorDeleteProjectCommand;
+export function upgradeProjectFloorCommand(
+  command:
+    | ProjectFloorUpdateProjectCommand
+    | LegacyProjectFloorUpdateProjectCommand
+): ProjectFloorUpdateProjectCommand;
+export function upgradeProjectFloorCommand(
+  command:
+    | ProjectFloorInsertProjectCommand
+    | ProjectFloorDeleteProjectCommand
+    | ProjectFloorUpdateProjectCommand
+    | LegacyProjectFloorInsertProjectCommand
+    | LegacyProjectFloorDeleteProjectCommand
+    | LegacyProjectFloorUpdateProjectCommand
+) {
+  if (command.schemaVersion === projectFloorCommandSchemaVersion) {
+    return command;
+  }
+  switch (command.type) {
+    case projectFloorInsertCommandType:
+      return createProjectFloorInsertProjectCommand(
+        upgradeLegacyFloorSnapshot(command.payload.floor)
+      );
+    case projectFloorDeleteCommandType:
+      return createProjectFloorDeleteProjectCommand(
+        upgradeLegacyFloorSnapshot(command.payload.floor)
+      );
+    case projectFloorUpdateCommandType:
+      return createProjectFloorUpdateProjectCommand(
+        upgradeLegacyFloorSnapshot(command.payload.expected),
+        upgradeLegacyFloorSnapshot(command.payload.target)
+      );
+  }
+}
+
+function assertMatchingBuildingUpdate(expected: unknown, target: unknown) {
+  assertProjectBuildingSnapshot(expected);
+  assertProjectBuildingSnapshot(target);
+  if (
+    expected.id !== target.id ||
+    expected.projectId !== target.projectId ||
+    expected.sortOrder !== target.sortOrder ||
+    expected.name === target.name
+  ) {
+    throw new Error("Project-building update must change only the name.");
+  }
+}
+
 function assertMatchingFloorUpdate(expected: unknown, target: unknown) {
   assertProjectFloorSnapshot(expected);
   assertProjectFloorSnapshot(target);
@@ -259,9 +500,11 @@ function assertMatchingFloorUpdate(expected: unknown, target: unknown) {
     expected.id !== target.id ||
     expected.projectId !== target.projectId ||
     expected.sortOrder !== target.sortOrder ||
-    expected.name === target.name
+    (expected.name === target.name && expected.buildingId === target.buildingId)
   ) {
-    throw new Error("Project-floor update must change only the name.");
+    throw new Error(
+      "Project-floor update must change only the name or the building."
+    );
   }
 }
 
@@ -277,22 +520,49 @@ function assertMatchingRoomUpdate(expected: unknown, target: unknown) {
   }
 }
 
+export function assertProjectBuildingSnapshot(
+  building: unknown
+): asserts building is ProjectBuildingSnapshot {
+  if (!isPlainObject(building) || Object.keys(building).length !== 4) {
+    throw new Error("Project-building snapshot is invalid.");
+  }
+  assertNormalizedNonEmptyString(building.id, "building.id");
+  assertNormalizedNonEmptyString(building.projectId, "building.projectId");
+  assertNormalizedNonEmptyString(building.name, "building.name");
+  assertSortOrder(building.sortOrder, "building.sortOrder");
+}
+
 export function assertProjectFloorSnapshot(
   floor: unknown
 ): asserts floor is ProjectFloorSnapshot {
+  if (!isPlainObject(floor) || Object.keys(floor).length !== 5) {
+    throw new Error("Project-floor snapshot is invalid.");
+  }
+  assertLegacyFloorFields(floor);
+  if (floor.buildingId !== null) {
+    assertNormalizedNonEmptyString(floor.buildingId, "floor.buildingId");
+  }
+}
+
+function assertLegacyProjectFloorSnapshot(
+  floor: unknown
+): asserts floor is LegacyProjectFloorSnapshot {
   if (!isPlainObject(floor) || Object.keys(floor).length !== 4) {
     throw new Error("Project-floor snapshot is invalid.");
   }
+  assertLegacyFloorFields(floor);
+}
+
+function assertLegacyFloorFields(floor: Record<string, unknown>) {
   assertNormalizedNonEmptyString(floor.id, "floor.id");
   assertNormalizedNonEmptyString(floor.projectId, "floor.projectId");
   assertNormalizedNonEmptyString(floor.name, "floor.name");
-  if (
+  assertSortOrder(floor.sortOrder, "floor.sortOrder");
-    typeof floor.sortOrder !== "number" ||
-    !Number.isSafeInteger(floor.sortOrder) ||
-    floor.sortOrder < 0
-  ) {
-    throw new Error("floor.sortOrder must be a non-negative integer.");
 }
+
+function upgradeLegacyFloorSnapshot(floor: unknown): ProjectFloorSnapshot {
+  assertLegacyProjectFloorSnapshot(floor);
+  return { ...floor, buildingId: null };
 }
 
 export function assertProjectRoomSnapshot(
@@ -310,11 +580,11 @@ export function assertProjectRoomSnapshot(
   assertNormalizedNonEmptyString(room.roomName, "room.roomName");
 }
 
-function assertProjectFloorStructureProjectCommand(
+function assertProjectBuildingStructureProjectCommand(
   command: SerializedProjectCommand<unknown>,
   expectedType:
-    | typeof projectFloorInsertCommandType
+    | typeof projectBuildingInsertCommandType
-    | typeof projectFloorDeleteCommandType
+    | typeof projectBuildingDeleteCommandType
 ) {
   if (
     command.schemaVersion !== projectLocationStructureCommandSchemaVersion ||
@@ -322,6 +592,29 @@ function assertProjectFloorStructureProjectCommand(
     !isPlainObject(command.payload) ||
     Object.keys(command.payload).length !== 1
   ) {
+    throw new Error("Unsupported project-building structure command.");
+  }
+  assertProjectBuildingSnapshot(command.payload.building);
+}
+
+function assertProjectFloorStructureProjectCommand(
+  command: SerializedProjectCommand<unknown>,
+  expectedType:
+    | typeof projectFloorInsertCommandType
+    | typeof projectFloorDeleteCommandType
+) {
+  if (
+    command.type !== expectedType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 1
+  ) {
+    throw new Error("Unsupported project-floor structure command.");
+  }
+  if (command.schemaVersion === legacyProjectFloorCommandSchemaVersion) {
+    assertLegacyProjectFloorSnapshot(command.payload.floor);
+    return;
+  }
+  if (command.schemaVersion !== projectFloorCommandSchemaVersion) {
     throw new Error("Unsupported project-floor structure command.");
   }
   assertProjectFloorSnapshot(command.payload.floor);
@@ -344,6 +637,16 @@ function assertProjectRoomStructureProjectCommand(
   assertProjectRoomSnapshot(command.payload.room);
 }
 
+function assertSortOrder(value: unknown, field: string) {
+  if (
+    typeof value !== "number" ||
+    !Number.isSafeInteger(value) ||
+    value < 0
+  ) {
+    throw new Error(`${field} must be a non-negative integer.`);
+  }
+}
+
 function assertNormalizedNonEmptyString(
   value: unknown,
   field: string

src/domain/models/project-settings-project-command.model.ts

@@ -3,13 +3,23 @@ import {
   distributionBoardSupplyTypes,
   type DistributionBoardSupplyType,
 } from "../../shared/constants/distribution-board.js";
+import {
+  projectCoverFieldMaxLengths,
+  projectCoverFields,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover.js";
 
 export const projectSettingsUpdateCommandType =
   "project.update-settings" as const;
-export const projectSettingsUpdateCommandSchemaVersion = 2 as const;
+// Version 3 adds the print cover fields. Versions 2 (without cover fields)
-const previousProjectSettingsUpdateCommandSchemaVersion = 1 as const;
+// and 1 (additionally without the public-building flag) stay executable;
+// their missing values keep the current project values.
+export const projectSettingsUpdateCommandSchemaVersion = 3 as const;
+export const withoutCoverProjectSettingsUpdateCommandSchemaVersion = 2 as const;
+export const baselineProjectSettingsUpdateCommandSchemaVersion = 1 as const;
 
-export interface ProjectSettingsValues {
+export interface ProjectSettingsValues
+  extends Record<ProjectCoverField, string | null> {
   name: string;
   internalProjectNumber: string | null;
   externalProjectNumber: string | null;
@@ -21,8 +31,13 @@ export interface ProjectSettingsValues {
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
 }
 
-type PreviousProjectSettingsValues = Omit<
+export type WithoutCoverProjectSettingsValues = Omit<
   ProjectSettingsValues,
+  ProjectCoverField
+>;
+
+export type BaselineProjectSettingsValues = Omit<
+  WithoutCoverProjectSettingsValues,
   "isPublicBuilding"
 >;
 
@@ -32,15 +47,22 @@ export interface CurrentProjectSettingsUpdateProjectCommand
   type: typeof projectSettingsUpdateCommandType;
 }
 
-interface PreviousProjectSettingsUpdateProjectCommand
+export interface WithoutCoverProjectSettingsUpdateProjectCommand
-  extends SerializedProjectCommand<PreviousProjectSettingsValues> {
+  extends SerializedProjectCommand<WithoutCoverProjectSettingsValues> {
-  schemaVersion: typeof previousProjectSettingsUpdateCommandSchemaVersion;
+  schemaVersion: typeof withoutCoverProjectSettingsUpdateCommandSchemaVersion;
+  type: typeof projectSettingsUpdateCommandType;
+}
+
+export interface BaselineProjectSettingsUpdateProjectCommand
+  extends SerializedProjectCommand<BaselineProjectSettingsValues> {
+  schemaVersion: typeof baselineProjectSettingsUpdateCommandSchemaVersion;
   type: typeof projectSettingsUpdateCommandType;
 }
 
 export type ProjectSettingsUpdateProjectCommand =
   | CurrentProjectSettingsUpdateProjectCommand
-  | PreviousProjectSettingsUpdateProjectCommand;
+  | WithoutCoverProjectSettingsUpdateProjectCommand
+  | BaselineProjectSettingsUpdateProjectCommand;
 
 export function createProjectSettingsUpdateProjectCommand(
   values: ProjectSettingsValues
@@ -60,7 +82,10 @@ export function assertProjectSettingsUpdateProjectCommand(
   if (
     command.type !== projectSettingsUpdateCommandType ||
     (command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion &&
-      command.schemaVersion !== previousProjectSettingsUpdateCommandSchemaVersion)
+      command.schemaVersion !==
+        withoutCoverProjectSettingsUpdateCommandSchemaVersion &&
+      command.schemaVersion !==
+        baselineProjectSettingsUpdateCommandSchemaVersion)
   ) {
     throw new Error("Unsupported project settings update command.");
   }
@@ -91,13 +116,23 @@ export function assertProjectSettingsUpdateProjectCommand(
       "Project settings update command contains invalid supply types."
     );
   }
-  const isPreviousSchema =
+  const payload = command.payload;
-    command.schemaVersion === previousProjectSettingsUpdateCommandSchemaVersion;
+  const expectedKeyCount =
+    command.schemaVersion === baselineProjectSettingsUpdateCommandSchemaVersion
+      ? 8
+      : command.schemaVersion ===
+          withoutCoverProjectSettingsUpdateCommandSchemaVersion
+        ? 9
+        : 9 + projectCoverFields.length;
   if (
-    (isPreviousSchema && Object.keys(command.payload).length !== 8) ||
+    Object.keys(payload).length !== expectedKeyCount ||
-    (!isPreviousSchema &&
+    (command.schemaVersion !==
-      (typeof command.payload.isPublicBuilding !== "boolean" ||
+      baselineProjectSettingsUpdateCommandSchemaVersion &&
-        Object.keys(command.payload).length !== 9))
+      typeof payload.isPublicBuilding !== "boolean") ||
+    (command.schemaVersion === projectSettingsUpdateCommandSchemaVersion &&
+      !projectCoverFields.every((field) =>
+        isNullableTrimmedString(payload[field], projectCoverFieldMaxLengths[field])
+      ))
   ) {
     throw new Error(
       "Project settings update command contains invalid values."

src/domain/models/project-state-snapshot.model.ts

@@ -1,5 +1,13 @@
 import { z } from "zod";
-import { distributionBoardSupplyTypes } from "../../shared/constants/distribution-board.js";
+import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
+} from "../../shared/constants/distribution-board.js";
+import {
+  projectCoverFieldMaxLengths,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover.js";
 import {
   circuitGroupCategories,
 } from "../../shared/constants/circuit-group.js";
@@ -27,7 +35,9 @@ import {
   type ExternalModelStateSnapshot,
 } from "../../external-model/domain/external-model-contracts.js";
 
-export const projectStateSnapshotSchemaVersion = 5 as const;
+export const projectStateSnapshotSchemaVersion = 7 as const;
+const coverProjectStateSnapshotSchemaVersion = 6 as const;
+const boardInfoProjectStateSnapshotSchemaVersion = 5 as const;
 const previousProjectStateSnapshotSchemaVersion = 4 as const;
 const externalModelProjectStateSnapshotSchemaVersion = 3 as const;
 const legacyProjectStateSnapshotSchemaVersion = 2 as const;
@@ -58,11 +68,31 @@ const previousProjectSchema = z
   })
   .strict();
 
-const projectSchema = previousProjectSchema
+const publicBuildingProjectSchema = previousProjectSchema
   .extend({ isPublicBuilding: z.boolean() })
   .strict();
 
-const distributionBoardSchema = z
+const projectCoverValueSchema = (field: ProjectCoverField) =>
+  z.string().trim().min(1).max(projectCoverFieldMaxLengths[field]).nullable();
+
+// Schema version 6 adds the print cover fields.
+const projectSchema = publicBuildingProjectSchema
+  .extend({
+    siteAddress: projectCoverValueSchema("siteAddress"),
+    workStage: projectCoverValueSchema("workStage"),
+    projectLead: projectCoverValueSchema("projectLead"),
+    projectEditor: projectCoverValueSchema("projectEditor"),
+  })
+  .strict();
+
+const emptyProjectCoverValues = {
+  siteAddress: null,
+  workStage: null,
+  projectLead: null,
+  projectEditor: null,
+};
+
+const legacyDistributionBoardSchema = z
   .object({
     id: idSchema,
     projectId: idSchema,
@@ -73,6 +103,35 @@ const distributionBoardSchema = z
   })
   .strict();
 
+const distributionBoardInfoValueSchema = (field: DistributionBoardInfoField) =>
+  z
+    .string()
+    .trim()
+    .min(1)
+    .max(distributionBoardInfoFieldMaxLengths[field])
+    .nullable();
+
+const distributionBoardSchema = legacyDistributionBoardSchema
+  .extend({
+    boardNumber: distributionBoardInfoValueSchema("boardNumber"),
+    location: distributionBoardInfoValueSchema("location"),
+    fedFrom: distributionBoardInfoValueSchema("fedFrom"),
+    remark: distributionBoardInfoValueSchema("remark"),
+  })
+  .strict();
+
+function withEmptyDistributionBoardInfo(
+  boards: Array<z.infer<typeof legacyDistributionBoardSchema>>
+) {
+  return boards.map((board) => ({
+    ...board,
+    boardNumber: null,
+    location: null,
+    fedFrom: null,
+    remark: null,
+  }));
+}
+
 const circuitListSchema = z
   .object({
     id: idSchema,
@@ -179,7 +238,7 @@ const projectDeviceSchema = z
   })
   .strict();
 
-const floorSchema = z
+const buildingSchema = z
   .object({
     id: idSchema,
     projectId: idSchema,
@@ -188,6 +247,19 @@ const floorSchema = z
   })
   .strict();
 
+const legacyFloorSchema = z
+  .object({
+    id: idSchema,
+    projectId: idSchema,
+    name: z.string().trim().min(1),
+    sortOrder: finiteNumberSchema,
+  })
+  .strict();
+
+const floorSchema = legacyFloorSchema
+  .extend({ buildingId: idSchema.nullable() })
+  .strict();
+
 const roomSchema = z
   .object({
     id: idSchema,
@@ -432,11 +504,24 @@ export function parseExternalModelStateSnapshot(
   return externalModelStateSchema.parse(value);
 }
 
-const projectStateSnapshotContents = {
+// Versions 1-6 have floors without a building and no building list.
+const previousProjectStateSnapshotContents = {
   circuitLists: z.array(circuitListSchema),
   circuitSections: z.array(circuitSectionSchema),
   circuits: z.array(circuitSchema),
   projectDevices: z.array(projectDeviceSchema),
+  floors: z.array(legacyFloorSchema),
+  rooms: z.array(roomSchema),
+  distributionBoardComponents: z.array(distributionBoardComponentSchema),
+  circuitProtectionDevices: z.array(circuitProtectionDeviceSchema),
+  distributionBoardComponentProtectionDevices: z.array(
+    componentProtectionDeviceSchema
+  ),
+};
+
+const projectStateSnapshotContents = {
+  ...previousProjectStateSnapshotContents,
+  buildings: z.array(buildingSchema),
   floors: z.array(floorSchema),
   rooms: z.array(roomSchema),
   distributionBoardComponents: z.array(distributionBoardComponentSchema),
@@ -457,33 +542,55 @@ export const projectStateSnapshotSchema = z
   })
   .strict();
 
-const previousProjectStateSnapshotSchema = z
+const coverProjectStateSnapshotSchema = z
   .object({
-    schemaVersion: z.literal(previousProjectStateSnapshotSchemaVersion),
+    schemaVersion: z.literal(coverProjectStateSnapshotSchemaVersion),
     project: projectSchema,
     distributionBoards: z.array(distributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     externalModel: externalModelStateSchema,
-    ...projectStateSnapshotContents,
+    ...previousProjectStateSnapshotContents,
+  })
+  .strict();
+
+const boardInfoProjectStateSnapshotSchema = z
+  .object({
+    schemaVersion: z.literal(boardInfoProjectStateSnapshotSchemaVersion),
+    project: publicBuildingProjectSchema,
+    distributionBoards: z.array(legacyDistributionBoardSchema),
+    externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
+    externalModel: externalModelStateSchema,
+    ...previousProjectStateSnapshotContents,
+  })
+  .strict();
+
+const previousProjectStateSnapshotSchema = z
+  .object({
+    schemaVersion: z.literal(previousProjectStateSnapshotSchemaVersion),
+    project: publicBuildingProjectSchema,
+    distributionBoards: z.array(legacyDistributionBoardSchema),
+    externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
+    externalModel: externalModelStateSchema,
+    ...previousProjectStateSnapshotContents,
   })
   .strict();
 
 const externalModelProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(externalModelProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
-    ...projectStateSnapshotContents,
+    ...previousProjectStateSnapshotContents,
   })
   .strict();
 
 const legacyProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(legacyProjectStateSnapshotSchemaVersion),
-    project: projectSchema,
+    project: publicBuildingProjectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
-    ...projectStateSnapshotContents,
+    ...previousProjectStateSnapshotContents,
   })
   .strict();
 
@@ -491,8 +598,8 @@ const baselineProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(baselineProjectStateSnapshotSchemaVersion),
     project: previousProjectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
-    ...projectStateSnapshotContents,
+    ...previousProjectStateSnapshotContents,
   })
   .strict();
 
@@ -500,6 +607,20 @@ export type ProjectStateSnapshot = z.infer<
   typeof projectStateSnapshotSchema
 >;
 
+/**
+ * Stored snapshots of every supported version can be restored: they are
+ * upgraded to the current version while parsing.
+ */
+export function isSupportedProjectStateSnapshotSchemaVersion(
+  schemaVersion: number
+): boolean {
+  return (
+    Number.isInteger(schemaVersion) &&
+    schemaVersion >= baselineProjectStateSnapshotSchemaVersion &&
+    schemaVersion <= projectStateSnapshotSchemaVersion
+  );
+}
+
 export function parseProjectStateSnapshot(
   value: unknown
 ): ProjectStateSnapshot {
@@ -512,6 +633,28 @@ export function parseProjectStateSnapshot(
 }
 
 function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
+  const cover = upgradeToCoverProjectStateSnapshot(value);
+  if (
+    cover === null ||
+    typeof cover !== "object" ||
+    Array.isArray(cover) ||
+    (cover as { schemaVersion?: unknown }).schemaVersion !==
+      coverProjectStateSnapshotSchemaVersion
+  ) {
+    return cover;
+  }
+  // Every supported version before 7 lacks buildings; its floors had no
+  // building.
+  const previous = coverProjectStateSnapshotSchema.parse(cover);
+  return {
+    ...previous,
+    schemaVersion: projectStateSnapshotSchemaVersion,
+    buildings: [],
+    floors: previous.floors.map((floor) => ({ ...floor, buildingId: null })),
+  };
+}
+
+function upgradeToCoverProjectStateSnapshot(value: unknown): unknown {
   if (
     value === null ||
     typeof value !== "object" ||
@@ -521,18 +664,40 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return value;
   }
   const schemaVersion = (value as { schemaVersion: number }).schemaVersion;
+  // Every supported version before 6 lacks the distribution-board info
+  // fields and the project cover fields; they are upgraded as empty (null)
+  // values.
+  if (schemaVersion === boardInfoProjectStateSnapshotSchemaVersion) {
+    const previous = boardInfoProjectStateSnapshotSchema.parse(value);
+    return {
+      ...previous,
+      schemaVersion: coverProjectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
+    };
+  }
   if (schemaVersion === previousProjectStateSnapshotSchemaVersion) {
     const previous = previousProjectStateSnapshotSchema.parse(value);
     return {
       ...previous,
-      schemaVersion: projectStateSnapshotSchemaVersion,
+      schemaVersion: coverProjectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
     };
   }
   if (schemaVersion === externalModelProjectStateSnapshotSchemaVersion) {
     const previous = externalModelProjectStateSnapshotSchema.parse(value);
     return {
       ...previous,
-      schemaVersion: projectStateSnapshotSchemaVersion,
+      schemaVersion: coverProjectStateSnapshotSchemaVersion,
+      project: { ...previous.project, ...emptyProjectCoverValues },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
       externalModel: emptyExternalModelState(),
     };
   }
@@ -540,7 +705,11 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     const legacy = legacyProjectStateSnapshotSchema.parse(value);
     return {
       ...legacy,
-      schemaVersion: projectStateSnapshotSchemaVersion,
+      schemaVersion: coverProjectStateSnapshotSchemaVersion,
+      project: { ...legacy.project, ...emptyProjectCoverValues },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        legacy.distributionBoards
+      ),
       externalCsvConfiguration: null,
       externalModel: emptyExternalModelState(),
     };
@@ -549,8 +718,15 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     const baseline = baselineProjectStateSnapshotSchema.parse(value);
     return {
       ...baseline,
-      schemaVersion: projectStateSnapshotSchemaVersion,
+      schemaVersion: coverProjectStateSnapshotSchemaVersion,
-      project: { ...baseline.project, isPublicBuilding: false },
+      project: {
+        ...baseline.project,
+        isPublicBuilding: false,
+        ...emptyProjectCoverValues,
+      },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        baseline.distributionBoards
+      ),
       externalCsvConfiguration: null,
       externalModel: emptyExternalModelState(),
     };
@@ -649,6 +825,7 @@ function assertProjectStateSnapshotRelations(
     snapshot.projectDevices,
     "project device"
   );
+  const buildingIds = uniqueIds(snapshot.buildings, "building");
   const floorIds = uniqueIds(snapshot.floors, "floor");
   const roomIds = uniqueIds(snapshot.rooms, "room");
   const circuitIds = uniqueIds(snapshot.circuits, "circuit");
@@ -727,8 +904,14 @@ function assertProjectStateSnapshotRelations(
       );
     }
   }
+  for (const building of snapshot.buildings) {
+    assertProjectOwnership(building.projectId, projectId, "building");
+  }
   for (const floor of snapshot.floors) {
     assertProjectOwnership(floor.projectId, projectId, "floor");
+    if (floor.buildingId !== null) {
+      assertReference(buildingIds, floor.buildingId, "floor building");
+    }
   }
   for (const room of snapshot.rooms) {
     assertProjectOwnership(room.projectId, projectId, "room");

src/domain/models/project-transfer.model.ts

@@ -84,6 +84,7 @@ export function remapProjectState(
     createId
   );
   const deviceIds = idMap(source.projectDevices, createId);
+  const buildingIds = idMap(source.buildings, createId);
   const floorIds = idMap(source.floors, createId);
   const roomIds = idMap(source.rooms, createId);
   const rowIds = new Map(
@@ -242,10 +243,19 @@ export function remapProjectState(
       id: requiredId(deviceIds, device.id),
       projectId: targetProjectId,
     })),
+    buildings: source.buildings.map((building) => ({
+      ...building,
+      id: requiredId(buildingIds, building.id),
+      projectId: targetProjectId,
+    })),
     floors: source.floors.map((floor) => ({
       ...floor,
       id: requiredId(floorIds, floor.id),
       projectId: targetProjectId,
+      buildingId:
+        floor.buildingId === null
+          ? null
+          : requiredId(buildingIds, floor.buildingId),
     })),
     rooms: source.rooms.map((room) => ({
       ...room,

src/domain/services/project-command.service.ts

@@ -70,12 +70,18 @@ import {
   type SerializedProjectCommand,
 } from "../models/project-command.model.js";
 import {
+  assertProjectBuildingDeleteProjectCommand,
+  assertProjectBuildingInsertProjectCommand,
+  assertProjectBuildingUpdateProjectCommand,
   assertProjectFloorDeleteProjectCommand,
   assertProjectFloorInsertProjectCommand,
   assertProjectFloorUpdateProjectCommand,
   assertProjectRoomDeleteProjectCommand,
   assertProjectRoomInsertProjectCommand,
   assertProjectRoomUpdateProjectCommand,
+  projectBuildingDeleteCommandType,
+  projectBuildingInsertCommandType,
+  projectBuildingUpdateCommandType,
   projectFloorDeleteCommandType,
   projectFloorInsertCommandType,
   projectFloorUpdateCommandType,
@@ -492,6 +498,18 @@ export class ProjectCommandService implements ProjectCommandExecutor {
           command: input.command,
         }).revision;
       }
+      case projectBuildingInsertCommandType: {
+        assertProjectBuildingInsertProjectCommand(input.command);
+        return this.projectLocationStructureStore.execute({ ...input, command: input.command }).revision;
+      }
+      case projectBuildingDeleteCommandType: {
+        assertProjectBuildingDeleteProjectCommand(input.command);
+        return this.projectLocationStructureStore.execute({ ...input, command: input.command }).revision;
+      }
+      case projectBuildingUpdateCommandType: {
+        assertProjectBuildingUpdateProjectCommand(input.command);
+        return this.projectLocationStructureStore.execute({ ...input, command: input.command }).revision;
+      }
       case projectFloorInsertCommandType: {
         assertProjectFloorInsertProjectCommand(input.command);
         return this.projectLocationStructureStore.execute({

src/frontend/components/AppShell.tsx

@@ -4,12 +4,14 @@ import { useEffect, useState } from "react";
 import { usePathname } from "next/navigation";
 import { Sidebar } from "./Sidebar";
 
-const PROJECT_AREA_PATTERN = /^\/projects(\/[^/]+)?$/;
+// Every page shows the (collapsible) sidebar except the print view, which is
+// a stand-alone document opened in its own tab and printed as PDF.
+const PRINT_VIEW_PATTERN = /^\/projects\/[^/]+\/print(\/|$)/;
 const SIDEBAR_COLLAPSED_STORAGE_KEY = "leistungsbilanz:sidebar-collapsed";
 
 export function AppShell({ children }: { children: React.ReactNode }) {
   const pathname = usePathname();
-  const showSidebar = PROJECT_AREA_PATTERN.test(pathname ?? "");
+  const showSidebar = !PRINT_VIEW_PATTERN.test(pathname ?? "");
   const [isSidebarCollapsed, setIsSidebarCollapsed] = useState(false);
 
   useEffect(() => {

src/frontend/components/Sidebar.tsx

@@ -7,14 +7,21 @@ import { listProjects } from "../utils/api";
 import type { ProjectDto } from "../types";
 import { ThemeToggle } from "./ThemeToggle";
 
+// Anchors on the project overview page (/projects/[id]).
 const PROJECT_SECTIONS = [
   { id: "verlauf", label: "Verlauf", icon: "↺" },
   { id: "verteilungen", label: "Verteilungen", icon: "⌁" },
-  { id: "etagen", label: "Etagen", icon: "▥" },
-  { id: "raeume", label: "Räume", icon: "⌂" },
   { id: "projektgeraete", label: "Projektgeräte", icon: "⚙" },
 ] as const;
 
+// Separate project sub-routes (/projects/[id]/<segment>).
+const PROJECT_ROUTES = [
+  { segment: "struktur", label: "Gebäudestruktur", icon: "▥" },
+] as const;
+
+// Matches the project overview and all of its sub-routes (group 2 = rest).
+const PROJECT_PATH_PATTERN = /^\/projects\/([^/]+)(\/.*)?$/;
+
 interface SidebarProps {
   isCollapsed: boolean;
   onToggleCollapsed: () => void;
@@ -22,8 +29,14 @@ interface SidebarProps {
 
 export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
   const pathname = usePathname();
-  const projectMatch = pathname?.match(/^\/projects\/([^/]+)$/);
+  const projectMatch = pathname?.match(PROJECT_PATH_PATTERN);
   const activeProjectId = projectMatch ? projectMatch[1] : null;
+  const projectSubPath = projectMatch?.[2] ?? "";
+  // Section anchors only exist (and are observed) on the overview itself.
+  const overviewProjectId =
+    activeProjectId && (projectSubPath === "" || projectSubPath === "/")
+      ? activeProjectId
+      : null;
 
   const [projects, setProjects] = useState<ProjectDto[]>([]);
   const [activeSection, setActiveSection] = useState<string | null>(null);
@@ -42,7 +55,7 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
   }, []);
 
   useEffect(() => {
-    if (!activeProjectId) {
+    if (!overviewProjectId) {
       setActiveSection(null);
       return;
     }
@@ -69,7 +82,7 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
 
     elements.forEach((element) => observer.observe(element));
     return () => observer.disconnect();
-  }, [activeProjectId]);
+  }, [overviewProjectId]);
 
   return (
     <aside className={isCollapsed ? "sidebar sidebar-collapsed" : "sidebar"}>
@@ -122,7 +135,8 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
         {activeProjectId && (
           <>
             <div className="sidebar-section-label">In diesem Projekt</div>
-            {PROJECT_SECTIONS.map(({ id, label, icon }) => (
+            {PROJECT_SECTIONS.map(({ id, label, icon }) =>
+              overviewProjectId ? (
                 <a
                   key={id}
                   href={`#${id}`}
@@ -132,7 +146,35 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
                   <span className="sidebar-icon">{icon}</span>
                   <span className="sidebar-label">{label}</span>
                 </a>
-            ))}
+              ) : (
+                <Link
+                  key={id}
+                  href={`/projects/${activeProjectId}#${id}`}
+                  className="sidebar-link"
+                  title={label}
+                >
+                  <span className="sidebar-icon">{icon}</span>
+                  <span className="sidebar-label">{label}</span>
+                </Link>
+              )
+            )}
+            {PROJECT_ROUTES.map(({ segment, label, icon }) => {
+              const href = `/projects/${activeProjectId}/${segment}`;
+              const isActive =
+                pathname === href || Boolean(pathname?.startsWith(`${href}/`));
+              return (
+                <Link
+                  key={segment}
+                  href={href}
+                  aria-current={isActive ? "page" : undefined}
+                  className={isActive ? "sidebar-link active" : "sidebar-link"}
+                  title={label}
+                >
+                  <span className="sidebar-icon">{icon}</span>
+                  <span className="sidebar-label">{label}</span>
+                </Link>
+              );
+            })}
           </>
         )}
       </nav>

src/frontend/components/distribution-board-info-card.tsx

@@ -0,0 +1,110 @@
+"use client";
+
+import {
+  distributionBoardInfoFieldLabels,
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardInfoFields,
+  type DistributionBoardInfoField,
+} from "../../shared/constants/distribution-board";
+import type { DistributionBoardInfoDto } from "../types";
+
+export type DistributionBoardInfoDraft = Record<DistributionBoardInfoField, string>;
+
+const placeholders: Record<DistributionBoardInfoField, string> = {
+  boardNumber: "z. B. UV 1.1",
+  location: "z. B. Raum 003 Technik",
+  fedFrom: "z. B. HV 0.1 oder HAK / Zähleranlage",
+  remark: "",
+};
+
+export function toDistributionBoardInfoDraft(
+  info: DistributionBoardInfoDto
+): DistributionBoardInfoDraft {
+  return {
+    boardNumber: info.boardNumber ?? "",
+    location: info.location ?? "",
+    fedFrom: info.fedFrom ?? "",
+    remark: info.remark ?? "",
+  };
+}
+
+export function fromDistributionBoardInfoDraft(
+  draft: DistributionBoardInfoDraft
+): DistributionBoardInfoDto {
+  const value = (field: DistributionBoardInfoField) =>
+    draft[field].trim() ? draft[field].trim() : null;
+  return {
+    boardNumber: value("boardNumber"),
+    location: value("location"),
+    fedFrom: value("fedFrom"),
+    remark: value("remark"),
+  };
+}
+
+/**
+ * Descriptive board data used by the print view title block. The values are
+ * local planning values; a later Revit import may prefill them only through
+ * an explicit, previewed decision.
+ */
+export function DistributionBoardInfoCard({
+  draft,
+  onChange,
+}: {
+  draft: DistributionBoardInfoDraft;
+  onChange: (draft: DistributionBoardInfoDraft) => void;
+}) {
+  return (
+    <section
+      aria-labelledby="distribution-board-info-heading"
+      className="card"
+    >
+      <div className="card-header" id="distribution-board-info-heading">
+        Infokarte
+      </div>
+      <div className="card-body row g-3">
+        {distributionBoardInfoFields.map((field) => (
+          <div
+            className={field === "remark" ? "col-12" : "col-12 col-md-6"}
+            key={field}
+          >
+            <label
+              className="form-label"
+              htmlFor={`distribution-board-info-${field}`}
+            >
+              {distributionBoardInfoFieldLabels[field]}
+            </label>
+            {field === "remark" ? (
+              <textarea
+                className="form-control"
+                id={`distribution-board-info-${field}`}
+                maxLength={distributionBoardInfoFieldMaxLengths[field]}
+                onChange={(event) =>
+                  onChange({ ...draft, [field]: event.target.value })
+                }
+                rows={2}
+                value={draft[field]}
+              />
+            ) : (
+              <input
+                className="form-control"
+                id={`distribution-board-info-${field}`}
+                maxLength={distributionBoardInfoFieldMaxLengths[field]}
+                onChange={(event) =>
+                  onChange({ ...draft, [field]: event.target.value })
+                }
+                placeholder={placeholders[field]}
+                value={draft[field]}
+              />
+            )}
+            {field === "fedFrom" ? (
+              <div className="form-text">
+                Vorerst Freitext. Die logische Verknüpfung mit dem
+                speisenden Verteiler folgt.
+              </div>
+            ) : null}
+          </div>
+        ))}
+      </div>
+    </section>
+  );
+}

src/frontend/components/floor-select-options.tsx

@@ -0,0 +1,49 @@
+"use client";
+
+import React from "react";
+import type { BuildingDto, FloorDto } from "../types";
+import { groupFloorsByBuilding } from "../utils/building-structure";
+
+export type FloorOption = Pick<FloorDto, "id" | "name"> & {
+  buildingId?: string | null;
+};
+
+interface FloorSelectOptionsProps {
+  buildings?: ReadonlyArray<Pick<BuildingDto, "id" | "name">>;
+  floors: ReadonlyArray<FloorOption>;
+}
+
+/**
+ * Floor <option>s for a <select>, grouped by building via <optgroup> as soon
+ * as the project has buildings. The caller renders its own empty option
+ * ("Ohne Etage") before these.
+ */
+export function FloorSelectOptions({
+  buildings = [],
+  floors,
+}: FloorSelectOptionsProps) {
+  if (!buildings.length) {
+    return (
+      <>
+        {floors.map((floor) => (
+          <option key={floor.id} value={floor.id}>
+            {floor.name}
+          </option>
+        ))}
+      </>
+    );
+  }
+  return (
+    <>
+      {groupFloorsByBuilding(floors, buildings).map((group) => (
+        <optgroup key={group.buildingId ?? "unassigned"} label={group.label}>
+          {group.floors.map((floor) => (
+            <option key={floor.id} value={floor.id}>
+              {floor.name}
+            </option>
+          ))}
+        </optgroup>
+      ))}
+    </>
+  );
+}

src/frontend/components/project-settings-modal.tsx

@@ -7,9 +7,16 @@ import {
   distributionBoardSupplyTypes,
   type DistributionBoardSupplyType,
 } from "../../shared/constants/distribution-board";
+import {
+  projectCoverFieldLabels,
+  projectCoverFieldMaxLengths,
+  projectCoverFields,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover";
 import { FormModal } from "./form-modal";
 
-export interface ProjectSettingsInput {
+export interface ProjectSettingsInput
+  extends Record<ProjectCoverField, string | null> {
   name: string;
   internalProjectNumber: string | null;
   externalProjectNumber: string | null;
@@ -21,6 +28,13 @@ export interface ProjectSettingsInput {
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
 }
 
+const coverFieldPlaceholders: Record<ProjectCoverField, string> = {
+  siteAddress: "Straße Nr.\nPLZ Ort",
+  workStage: "z. B. LPH 5 – Ausführungsplanung",
+  projectLead: "",
+  projectEditor: "",
+};
+
 interface ProjectSettingsModalProps {
   isSaving: boolean;
   onClose: () => void;
@@ -71,6 +85,14 @@ export function ProjectSettingsModal({
   ] = useState<DistributionBoardSupplyType[]>(
     project.enabledDistributionBoardSupplyTypes
   );
+  const [coverValues, setCoverValues] = useState<
+    Record<ProjectCoverField, string>
+  >({
+    siteAddress: project.siteAddress ?? "",
+    workStage: project.workStage ?? "",
+    projectLead: project.projectLead ?? "",
+    projectEditor: project.projectEditor ?? "",
+  });
   const [transfer, setTransfer] = useState<unknown>(null);
   const [transferFilename, setTransferFilename] = useState("");
   const [importMode, setImportMode] = useState<"replace" | "duplicate">(
@@ -91,6 +113,10 @@ export function ProjectSettingsModal({
       singlePhaseVoltageV: Number(singlePhaseVoltageV),
       threePhaseVoltageV: Number(threePhaseVoltageV),
       enabledDistributionBoardSupplyTypes,
+      siteAddress: toNullableString(coverValues.siteAddress),
+      workStage: toNullableString(coverValues.workStage),
+      projectLead: toNullableString(coverValues.projectLead),
+      projectEditor: toNullableString(coverValues.projectEditor),
     });
   }
 
@@ -309,6 +335,57 @@ export function ProjectSettingsModal({
             value={threePhaseVoltageV}
           />
         </div>
+        <div className="col-12">
+          <hr className="my-2" />
+          <h3 className="h6">Deckblatt</h3>
+          <p className="text-secondary small">
+            Angaben für das Deckblatt der Seitenansicht. Büroname und
+            Büroanschrift werden projektübergreifend in der Seitenansicht
+            gepflegt.
+          </p>
+          <div className="row g-3">
+            {projectCoverFields.map((field) => (
+              <div
+                className={field === "siteAddress" ? "col-12" : "col-12 col-md-6"}
+                key={field}
+              >
+                <label className="form-label" htmlFor={`project-cover-${field}`}>
+                  {projectCoverFieldLabels[field]}
+                </label>
+                {field === "siteAddress" ? (
+                  <textarea
+                    className="form-control"
+                    id={`project-cover-${field}`}
+                    maxLength={projectCoverFieldMaxLengths[field]}
+                    onChange={(event) =>
+                      setCoverValues((current) => ({
+                        ...current,
+                        [field]: event.target.value,
+                      }))
+                    }
+                    placeholder={coverFieldPlaceholders[field]}
+                    rows={2}
+                    value={coverValues[field]}
+                  />
+                ) : (
+                  <input
+                    className="form-control"
+                    id={`project-cover-${field}`}
+                    maxLength={projectCoverFieldMaxLengths[field]}
+                    onChange={(event) =>
+                      setCoverValues((current) => ({
+                        ...current,
+                        [field]: event.target.value,
+                      }))
+                    }
+                    placeholder={coverFieldPlaceholders[field]}
+                    value={coverValues[field]}
+                  />
+                )}
+              </div>
+            ))}
+          </div>
+        </div>
         <div className="col-12">
           <hr className="my-2" />
           <h3 className="h6">Projekt importieren oder exportieren</h3>

src/frontend/components/room-modal.tsx

@@ -1,11 +1,14 @@
 "use client";
 
 import React, { type FormEvent, useState } from "react";
-import type { CreateRoomInput, FloorDto, RoomDto } from "../types";
+import type { BuildingDto, CreateRoomInput, RoomDto } from "../types";
+import { FloorSelectOptions, type FloorOption } from "./floor-select-options";
 import { FormModal } from "./form-modal";
 
 interface RoomModalProps {
-  floors: FloorDto[];
+  /** When given, the floor select groups floors by building. */
+  buildings?: ReadonlyArray<Pick<BuildingDto, "id" | "name">>;
+  floors: ReadonlyArray<FloorOption>;
   initialRoom?: RoomDto;
   initialValues?: Partial<CreateRoomInput>;
   isSaving: boolean;
@@ -15,6 +18,7 @@ interface RoomModalProps {
 }
 
 export function RoomModal({
+  buildings,
   floors,
   initialRoom,
   initialValues,
@@ -83,7 +87,7 @@ export function RoomModal({
             value={floorId}
           >
             <option value="">Ohne Etage</option>
-            {floors.map((floor) => <option key={floor.id} value={floor.id}>{floor.name}</option>)}
+            <FloorSelectOptions buildings={buildings} floors={floors} />
           </select>
         </div>
       </div>

src/frontend/print/print-document-model.ts

@@ -0,0 +1,191 @@
+import { protectionDeviceTypeLabels } from "../../shared/constants/protection-device";
+import type {
+  CircuitTreeCircuitDto,
+  CircuitTreeProtectionDeviceDto,
+  CircuitTreeResponseDto,
+  DistributionBoardDto,
+} from "../types";
+
+/**
+ * Pure read model for the print view (cover page, board overview and board
+ * plans). It only derives display values from the existing circuit-tree
+ * responses and never changes project data.
+ */
+export interface PrintBoardSummary {
+  board: DistributionBoardDto;
+  circuitListId: string;
+  tree: CircuitTreeResponseDto;
+  floorName: string | null;
+  circuitCount: number;
+  /** Σ quantity × power per unit, without any simultaneity factor. */
+  installedPowerKw: number;
+  /** Σ row totals, i.e. with the device-row simultaneity factors. */
+  devicePowerKw: number;
+  simultaneityFactor: number;
+  /** Device power with the board simultaneity factor applied. */
+  demandPowerKw: number;
+  /**
+   * Symmetrical three-phase design current from the apparent power
+   * S = Σ(row total / cos φ) × board GZF. A missing cos φ counts as 1.
+   */
+  designCurrentA: number;
+}
+
+export function summarizePrintBoard(input: {
+  board: DistributionBoardDto;
+  circuitListId: string;
+  tree: CircuitTreeResponseDto;
+  floorName: string | null;
+}): PrintBoardSummary {
+  const { tree } = input;
+  let circuitCount = 0;
+  let installedPowerKw = 0;
+  let apparentPowerKva = 0;
+  for (const section of tree.sections) {
+    for (const circuit of section.circuits) {
+      circuitCount += 1;
+      for (const row of circuit.deviceRows) {
+        installedPowerKw += row.quantity * row.powerPerUnit;
+        apparentPowerKva += row.rowTotalPower / (row.cosPhi || 1);
+      }
+    }
+  }
+  const simultaneityFactor = tree.distributionBoardSimultaneityFactor;
+  return {
+    ...input,
+    circuitCount,
+    installedPowerKw,
+    devicePowerKw: tree.distributionBoardTotalPower,
+    simultaneityFactor,
+    demandPowerKw: tree.distributionBoardTotalPowerWithSimultaneityFactor,
+    designCurrentA:
+      (apparentPowerKva * simultaneityFactor * 1000) /
+      (Math.sqrt(3) * tree.threePhaseVoltageV),
+  };
+}
+
+export interface PrintBoardHierarchyEntry {
+  summary: PrintBoardSummary;
+  depth: number;
+  parentBoardId: string | null;
+  /** Own demand plus the plain sum of all resolved downstream boards. */
+  cumulatedDemandPowerKw: number;
+}
+
+export function assertPrintRevisionConsistency(
+  revision: number,
+  summaries: readonly PrintBoardSummary[],
+  finalRevision: number
+) {
+  if (finalRevision !== revision || summaries.some(({ tree }) => tree.currentRevision !== revision)) {
+    throw new Error("Das Projekt wurde während des Ladens geändert. Bitte die Seitenansicht neu laden.");
+  }
+}
+
+/**
+ * PRELIMINARY: `fedFrom` is free text until the logical feed link is
+ * decided. A board is shown below another board only when its `fedFrom`
+ * text equals that board's number or name (case-insensitive). The
+ * cumulated value is a plain sum without an upstream simultaneity factor.
+ * Unresolved texts and cycles keep a board at the top level.
+ */
+export function buildPreliminaryBoardHierarchy(
+  summaries: PrintBoardSummary[]
+): PrintBoardHierarchyEntry[] {
+  const normalize = (value: string | null) =>
+    value?.trim().toLocaleLowerCase("de") || null;
+  const parentById = new Map<string, string | null>();
+  for (const summary of summaries) {
+    const fedFrom = normalize(summary.board.fedFrom);
+    const candidates = fedFrom
+      ? summaries.filter(
+          (candidate) =>
+            candidate !== summary &&
+            (normalize(candidate.board.boardNumber) === fedFrom ||
+              normalize(candidate.board.name) === fedFrom)
+        )
+      : [];
+    const parent = candidates.length === 1 ? candidates[0] : undefined;
+    parentById.set(summary.board.id, parent?.board.id ?? null);
+  }
+  for (const summary of summaries) {
+    const visited = new Set<string>([summary.board.id]);
+    let current = parentById.get(summary.board.id) ?? null;
+    while (current !== null) {
+      if (visited.has(current)) {
+        parentById.set(summary.board.id, null);
+        break;
+      }
+      visited.add(current);
+      current = parentById.get(current) ?? null;
+    }
+  }
+
+  const childrenOf = (boardId: string | null) =>
+    summaries.filter(
+      (summary) => parentById.get(summary.board.id) === boardId
+    );
+  const cumulated = (summary: PrintBoardSummary): number =>
+    summary.demandPowerKw +
+    childrenOf(summary.board.id).reduce(
+      (sum, child) => sum + cumulated(child),
+      0
+    );
+
+  const entries: PrintBoardHierarchyEntry[] = [];
+  const walk = (summary: PrintBoardSummary, depth: number) => {
+    entries.push({
+      summary,
+      depth,
+      parentBoardId: parentById.get(summary.board.id) ?? null,
+      cumulatedDemandPowerKw: cumulated(summary),
+    });
+    childrenOf(summary.board.id).forEach((child) => walk(child, depth + 1));
+  };
+  childrenOf(null).forEach((root) => walk(root, 0));
+  return entries;
+}
+
+const kilowattFormat = new Intl.NumberFormat("de-DE", {
+  minimumFractionDigits: 2,
+  maximumFractionDigits: 2,
+});
+const unitPowerFormat = new Intl.NumberFormat("de-DE", {
+  minimumFractionDigits: 3,
+  maximumFractionDigits: 3,
+});
+const currentFormat = new Intl.NumberFormat("de-DE", {
+  minimumFractionDigits: 1,
+  maximumFractionDigits: 1,
+});
+
+export const formatKilowatt = (value: number) => kilowattFormat.format(value);
+export const formatUnitPower = (value: number) => unitPowerFormat.format(value);
+export const formatFactor = (value: number) => kilowattFormat.format(value);
+export const formatCurrent = (value: number) => currentFormat.format(value);
+
+export function formatProtectionDevice(
+  protection: CircuitTreeProtectionDeviceDto | undefined
+): string | null {
+  if (!protection) {
+    return null;
+  }
+  const parts = [
+    protectionDeviceTypeLabels[protection.type],
+    protection.tripCharacteristic,
+    `${protection.ratedCurrentA} A`,
+    protection.fuseUtilizationCategory,
+  ].filter(Boolean);
+  let text = parts.join(" ");
+  if (protection.ratedResidualCurrentMa !== undefined) {
+    text += `, ${protection.ratedResidualCurrentMa} mA`;
+    if (protection.rcdType) {
+      text += ` Typ ${protection.rcdType}`;
+    }
+  }
+  return text;
+}
+
+export function formatCircuitCable(circuit: CircuitTreeCircuitDto): string | null {
+  return [circuit.cableType, circuit.cableCrossSection].filter(Boolean).join(" · ") || null;
+}

src/frontend/print/print-document.css

@@ -0,0 +1,481 @@
+/* Print view (Seitenansicht) in the kbp corporate design. Colors are
+   derived from the kbp logo and presentation material; change them only
+   here.
+   All selectors are scoped to .print-view. The @page rules (format, margins,
+   page numbers) are injected by the print page because they need project
+   data. */
+.print-view {
+  --pd-blue: #476088;
+  --pd-lilac: #9198c4;
+  --pd-line: #d6dae5;
+  --pd-tint: #f5f6fa;
+  --pd-text: #2b2b2b;
+  --pd-muted: #6b7280;
+  --pd-accent: #c9782a;
+  --pd-font: Arial, "Helvetica Neue", Helvetica, sans-serif;
+  --pd-landscape-width: 297mm;
+  --pd-landscape-height: 210mm;
+  min-height: 100vh;
+  background: #e7e9ef;
+  color: var(--pd-text);
+  font-family: var(--pd-font);
+  color-scheme: light;
+}
+.print-view.pd-a3 {
+  --pd-landscape-width: 420mm;
+  --pd-landscape-height: 297mm;
+}
+
+.pd-toolbar {
+  position: sticky;
+  top: 0;
+  z-index: 5;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+  align-items: center;
+  padding: 10px 16px;
+  background: #fff;
+  border-bottom: 1px solid var(--pd-line);
+  font-size: 14px;
+}
+.pd-toolbar-title {
+  margin-right: auto;
+  color: var(--pd-blue);
+  font-weight: bold;
+}
+.pd-toolbar .pd-toolbar-message {
+  color: var(--pd-muted);
+  font-size: 13px;
+}
+.pd-toolbar .pd-toolbar-error {
+  color: #b04035;
+  font-size: 13px;
+}
+
+.pd-pages {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 24px;
+  padding: 24px 16px 48px;
+  overflow-x: auto;
+}
+.pd-sheet {
+  position: relative;
+  flex: none;
+  background: #fff;
+  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
+  font-size: 9pt;
+  line-height: 1.3;
+}
+.pd-portrait {
+  width: 210mm;
+  min-height: 297mm;
+  padding: 18mm 18mm 22mm;
+  page: lb-portrait;
+}
+.pd-landscape {
+  width: var(--pd-landscape-width);
+  min-height: var(--pd-landscape-height);
+  padding: 12mm 12mm 18mm;
+  page: lb-landscape;
+}
+.pd-a3 .pd-landscape {
+  font-size: 10pt;
+}
+
+.print-view table {
+  border-collapse: collapse;
+  width: 100%;
+}
+.print-view caption {
+  caption-side: top;
+  padding: 0 0 1.5mm;
+  color: var(--pd-blue);
+  font-size: 10pt;
+  font-weight: bold;
+  letter-spacing: 0.04em;
+  text-align: left;
+  text-transform: uppercase;
+}
+.print-view sub {
+  font-size: 0.75em;
+}
+.pd-r {
+  text-align: right !important;
+}
+.pd-placeholder {
+  color: var(--pd-accent);
+  font-style: italic;
+}
+.pd-open {
+  color: var(--pd-accent);
+  font-weight: bold;
+}
+.pd-multiline {
+  white-space: pre-line;
+}
+.pd-logo {
+  display: block;
+  max-width: 100%;
+  object-fit: contain;
+}
+.pd-logo-missing {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px dashed var(--pd-line);
+  color: var(--pd-muted);
+  font-size: 8pt;
+}
+
+/* Cover */
+.pd-cover-head {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  border-bottom: 2px solid var(--pd-blue);
+  padding-bottom: 6mm;
+}
+.pd-cover-kicker {
+  margin-top: 3mm;
+  color: var(--pd-muted);
+  font-size: 10pt;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+}
+.pd-cover-logo {
+  height: 15mm;
+  width: auto;
+  max-width: 60mm;
+}
+span.pd-cover-logo {
+  width: 40mm;
+}
+.pd-cover-title {
+  margin: 14mm 0 10mm;
+}
+.pd-cover-title h1 {
+  margin: 0;
+  color: var(--pd-blue);
+  font-size: 30pt;
+  font-weight: bold;
+}
+.pd-cover-title p {
+  margin: 2mm 0 0;
+  color: var(--pd-muted);
+  font-size: 13pt;
+}
+.pd-kv {
+  margin-bottom: 7mm;
+}
+.pd-kv th,
+.pd-kv td {
+  border: 1px solid var(--pd-line);
+  padding: 2mm 3mm;
+  font-size: 9.5pt;
+  text-align: left;
+  vertical-align: top;
+}
+.pd-kv th {
+  width: 42mm;
+  background: var(--pd-tint);
+  color: var(--pd-muted);
+  font-weight: normal;
+}
+.pd-cover-cols {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 6mm;
+}
+.pd-cover-cols .pd-kv th {
+  width: 30mm;
+}
+.pd-block {
+  margin-bottom: 7mm;
+}
+.pd-col-index {
+  width: 14mm;
+}
+
+/* Generic grid tables */
+.pd-grid th,
+.pd-grid td {
+  border: 1px solid var(--pd-line);
+  padding: 1.3mm 2mm;
+  text-align: left;
+  vertical-align: top;
+}
+.pd-grid > thead > tr > th:not(.pd-tb-cell) {
+  background: var(--pd-blue);
+  border-color: var(--pd-blue);
+  color: #fff;
+  font-weight: bold;
+  vertical-align: bottom;
+}
+
+/* Footer (screen only; printed pages use @page margin boxes) */
+.pd-sheet-footer {
+  position: absolute;
+  left: 12mm;
+  right: 12mm;
+  bottom: 7mm;
+  display: flex;
+  justify-content: space-between;
+  border-top: 1px solid var(--pd-line);
+  padding-top: 2mm;
+  color: var(--pd-muted);
+  font-size: 7.5pt;
+}
+.pd-portrait .pd-sheet-footer {
+  left: 18mm;
+  right: 18mm;
+  bottom: 10mm;
+}
+
+/* Title block */
+.pd-grid th.pd-tb-cell {
+  border: none;
+  padding: 0 0 4mm;
+  background: none;
+  font-weight: normal;
+}
+.pd-titleblock {
+  display: grid;
+  grid-template-columns: 28mm 1fr auto auto;
+  border: 1.5px solid var(--pd-blue);
+  margin-bottom: 4mm;
+  background: #fff;
+  font-size: 9pt;
+}
+.pd-grid .pd-titleblock {
+  margin-bottom: 0;
+}
+.pd-titleblock > * {
+  padding: 2.5mm 3.5mm;
+  border-left: 1px solid var(--pd-line);
+}
+.pd-titleblock > :first-child {
+  border-left: none;
+}
+.pd-tb-logo {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 17mm;
+}
+.pd-tb-logo-image {
+  max-height: 10mm;
+}
+span.pd-tb-logo-image {
+  width: 100%;
+  height: 10mm;
+}
+.pd-tb-kicker {
+  color: var(--pd-muted);
+  font-size: 7.5pt;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+}
+.pd-tb-title {
+  display: flex;
+  align-items: baseline;
+  gap: 4mm;
+  margin-top: 1mm;
+}
+.pd-tb-number {
+  color: var(--pd-blue);
+  font-size: 18pt;
+  font-weight: bold;
+}
+.pd-tb-name {
+  font-size: 14pt;
+  font-weight: bold;
+}
+.pd-tb-grid {
+  display: grid;
+  grid-template-columns: auto auto;
+  gap: 0.8mm 4mm;
+  align-content: center;
+  margin: 0;
+  font-size: 8pt;
+}
+.pd-tb-grid div {
+  display: contents;
+}
+.pd-tb-grid dt {
+  color: var(--pd-muted);
+  font-weight: normal;
+}
+.pd-tb-grid dd {
+  margin: 0;
+  font-weight: bold;
+}
+.pd-tb-meta {
+  background: var(--pd-tint);
+}
+
+/* Board plan table */
+.pd-plan {
+  font-size: 7.6pt;
+  line-height: 1.2;
+}
+.pd-a3 .pd-plan {
+  font-size: 9pt;
+}
+.pd-plan th,
+.pd-plan td {
+  padding: 0.75mm 1.6mm;
+}
+.pd-plan td.pd-bmk {
+  color: var(--pd-blue);
+  font-weight: bold;
+  white-space: nowrap;
+}
+.pd-plan tr.pd-group td {
+  background: var(--pd-tint);
+  border-top: 1.5px solid var(--pd-lilac);
+  font-weight: bold;
+}
+.pd-plan tr.pd-component td,
+.pd-plan tr.pd-component td.pd-bmk,
+.pd-plan tr.pd-device td {
+  color: var(--pd-muted);
+}
+.pd-plan tr.pd-device td:nth-child(2) {
+  padding-left: 6mm;
+}
+.pd-plan tr.pd-reserve td {
+  color: var(--pd-muted);
+  font-style: italic;
+}
+.pd-plan tr.pd-subtotal td {
+  border-bottom: 1.5px solid var(--pd-line);
+  font-weight: bold;
+}
+.pd-plan .pd-sub {
+  color: var(--pd-muted);
+  font-size: 0.9em;
+}
+.pd-plan tfoot td {
+  background: var(--pd-tint);
+  font-weight: bold;
+}
+.pd-plan tfoot tr.pd-grand td {
+  background: var(--pd-blue);
+  border-color: var(--pd-blue);
+  color: #fff;
+}
+.pd-plan tr {
+  break-inside: avoid;
+}
+
+/* Overview */
+.pd-overview {
+  display: grid;
+  grid-template-columns: 62mm 1fr;
+  gap: 6mm;
+}
+.pd-a3 .pd-overview {
+  grid-template-columns: 90mm 1fr;
+}
+.pd-structure h2 {
+  margin: 0 0 3mm;
+  color: var(--pd-blue);
+  font-size: 10pt;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+}
+.pd-tree,
+.pd-tree ul {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+.pd-tree ul {
+  margin-left: 5mm;
+  padding-left: 4mm;
+  border-left: 1.5px solid var(--pd-lilac);
+}
+.pd-tree li {
+  position: relative;
+  margin: 2.5mm 0;
+}
+.pd-tree ul > li::before {
+  content: "";
+  position: absolute;
+  left: -4mm;
+  top: 5mm;
+  width: 4mm;
+  border-top: 1.5px solid var(--pd-lilac);
+}
+.pd-node {
+  display: grid;
+  gap: 0.3mm;
+  padding: 1.5mm 2.5mm;
+  border: 1px solid var(--pd-line);
+  border-left: 3px solid var(--pd-blue);
+  background: #fff;
+}
+.pd-node.pd-feed {
+  border-left-color: var(--pd-accent);
+}
+.pd-node span {
+  color: var(--pd-muted);
+  font-size: 8pt;
+}
+.pd-node em {
+  color: var(--pd-blue);
+  font-size: 8.5pt;
+  font-style: normal;
+  font-weight: bold;
+}
+.pd-note {
+  margin: 4mm 0 1mm;
+  padding: 2.5mm 3mm;
+  border-left: 3px solid var(--pd-accent);
+  background: #fbf4ec;
+  font-size: 8pt;
+}
+.pd-legend {
+  margin: 1mm 0 0;
+  color: var(--pd-muted);
+  font-size: 7.5pt;
+}
+
+@media print {
+  html,
+  body,
+  .print-view {
+    background: #fff !important;
+  }
+  /* The dark theme sets color-scheme: dark on the root; Chrome then paints
+     the page margins dark. Printing always uses the light scheme. */
+  html:has(.print-view) {
+    color-scheme: light !important;
+  }
+  .pd-toolbar,
+  .pd-sheet-footer {
+    display: none !important;
+  }
+  .pd-pages {
+    display: block;
+    padding: 0;
+    overflow: visible;
+  }
+  .pd-sheet {
+    width: auto;
+    min-height: 0;
+    padding: 0;
+    box-shadow: none;
+    break-after: page;
+  }
+  .pd-sheet:last-child {
+    break-after: auto;
+  }
+  .print-view * {
+    -webkit-print-color-adjust: exact;
+    print-color-adjust: exact;
+  }
+}

src/frontend/print/print-document.tsx

@@ -0,0 +1,625 @@
+"use client";
+
+import type { ReactNode } from "react";
+import type {
+  CircuitTreeCircuitDto,
+  CircuitTreeComponentDto,
+  CircuitTreeDeviceRowDto,
+  OfficeProfileDto,
+  ProjectDto,
+  ProjectSnapshotMetadataDto,
+} from "../types";
+import {
+  formatCircuitCable,
+  formatCurrent,
+  formatFactor,
+  formatKilowatt,
+  formatProtectionDevice,
+  formatUnitPower,
+  type PrintBoardHierarchyEntry,
+} from "./print-document-model";
+
+export interface PrintDocumentProps {
+  project: ProjectDto;
+  office: OfficeProfileDto;
+  entries: PrintBoardHierarchyEntry[];
+  namedSnapshots: ProjectSnapshotMetadataDto[];
+  logoSrc: string | null;
+  printedAt: Date;
+}
+
+/** Shows a value or the orange "[ergänzen]" marker for missing data. */
+function Value({ value, multiline = false }: { value: string | null; multiline?: boolean }) {
+  if (!value) {
+    return <Placeholder />;
+  }
+  return multiline ? <span className="pd-multiline">{value}</span> : <>{value}</>;
+}
+
+const dateFormat = new Intl.DateTimeFormat("de-DE", {
+  day: "2-digit",
+  month: "2-digit",
+  year: "numeric",
+});
+
+function Placeholder({ label = "ergänzen" }: { label?: string }) {
+  return <span className="pd-placeholder">[{label}]</span>;
+}
+
+function Open() {
+  return <span className="pd-open">offen</span>;
+}
+
+function Logo({ src, className }: { src: string | null; className: string }) {
+  return src ? (
+    // eslint-disable-next-line @next/next/no-img-element
+    <img alt="Logo" className={`pd-logo ${className}`} src={src} />
+  ) : (
+    <span className={`pd-logo-missing ${className}`}>Logo</span>
+  );
+}
+
+function SheetFooter({ project, stand }: { project: ProjectDto; stand: string }) {
+  return (
+    <div className="pd-sheet-footer" aria-hidden="true">
+      <span>{project.name} · Leistungsbilanz</span>
+      <span>
+        Stand {stand} · Datenstand Rev. {project.currentRevision}
+      </span>
+    </div>
+  );
+}
+
+function TitleBlock({
+  kicker,
+  number,
+  name,
+  rows,
+  project,
+  stand,
+  logoSrc,
+}: {
+  kicker: string;
+  number?: string | null;
+  name: string;
+  rows: Array<[ReactNode, ReactNode]>;
+  project: ProjectDto;
+  stand: string;
+  logoSrc: string | null;
+}) {
+  return (
+    <div className="pd-titleblock">
+      <div className="pd-tb-logo">
+        <Logo className="pd-tb-logo-image" src={logoSrc} />
+      </div>
+      <div className="pd-tb-main">
+        <div className="pd-tb-kicker">{kicker}</div>
+        <div className="pd-tb-title">
+          {number ? <span className="pd-tb-number">{number}</span> : null}
+          <span className="pd-tb-name">{name}</span>
+        </div>
+      </div>
+      <dl className="pd-tb-grid">
+        {rows.map(([label, value], index) => (
+          <div key={index}>
+            <dt>{label}</dt>
+            <dd>{value}</dd>
+          </div>
+        ))}
+      </dl>
+      <dl className="pd-tb-grid pd-tb-meta">
+        <div>
+          <dt>Projekt</dt>
+          <dd>{project.name}</dd>
+        </div>
+        <div>
+          <dt>Projekt-Nr.</dt>
+          <dd>{project.internalProjectNumber ?? "–"}</dd>
+        </div>
+        <div>
+          <dt>Stand</dt>
+          <dd>{stand}</dd>
+        </div>
+        <div>
+          <dt>Datenstand</dt>
+          <dd>Rev. {project.currentRevision}</dd>
+        </div>
+      </dl>
+    </div>
+  );
+}
+
+function boardLabel(entry: PrintBoardHierarchyEntry) {
+  const { board } = entry.summary;
+  return board.boardNumber ? `${board.boardNumber} – ${board.name}` : board.name;
+}
+
+function CoverSheet({
+  project,
+  office,
+  entries,
+  namedSnapshots,
+  logoSrc,
+  stand,
+}: Omit<PrintDocumentProps, "printedAt"> & { stand: string }) {
+  return (
+    <section className="pd-sheet pd-portrait pd-cover">
+      <div className="pd-cover-head">
+        <div className="pd-cover-kicker">Projektdokumentation Elektrotechnik</div>
+        <Logo className="pd-cover-logo" src={logoSrc} />
+      </div>
+      <div className="pd-cover-title">
+        <h1>Leistungsbilanz</h1>
+        <p>Verteilerübersicht und Verteilerpläne</p>
+      </div>
+
+      <table className="pd-kv">
+        <caption>Projekt</caption>
+        <tbody>
+          <tr><th>Bauvorhaben</th><td>{project.name}</td></tr>
+          <tr><th>Anschrift</th><td><Value multiline value={project.siteAddress} /></td></tr>
+          <tr><th>Bauherr</th><td><Value value={project.buildingOwner} /></td></tr>
+          <tr><th>Projektnummer intern</th><td><Value value={project.internalProjectNumber} /></td></tr>
+          <tr><th>Projektnummer extern</th><td><Value value={project.externalProjectNumber} /></td></tr>
+          <tr><th>Leistungsphase</th><td><Value value={project.workStage} /></td></tr>
+          <tr><th>Gewerk</th><td>KG 440 – Starkstromanlagen</td></tr>
+          <tr><th>Beschreibung</th><td>{project.description ?? "–"}</td></tr>
+        </tbody>
+      </table>
+
+      <div className="pd-cover-cols">
+        <table className="pd-kv">
+          <caption>Planverfasser</caption>
+          <tbody>
+            <tr><th>Büro</th><td><Value value={office.officeName} /></td></tr>
+            <tr><th>Anschrift</th><td><Value multiline value={office.officeAddress} /></td></tr>
+            <tr><th>Projektleitung</th><td><Value value={project.projectLead} /></td></tr>
+            <tr><th>Bearbeitung</th><td><Value value={project.projectEditor} /></td></tr>
+          </tbody>
+        </table>
+        <table className="pd-kv">
+          <caption>Dokument</caption>
+          <tbody>
+            <tr><th>Dokumentart</th><td>Leistungsbilanz</td></tr>
+            <tr><th>Stand</th><td>{stand}</td></tr>
+            <tr><th>Datenstand</th><td>Revision {project.currentRevision}</td></tr>
+            <tr><th>Verteiler</th><td>{entries.length}</td></tr>
+          </tbody>
+        </table>
+      </div>
+
+      <table className="pd-grid pd-block">
+        <caption>Planstände</caption>
+        <thead>
+          <tr><th className="pd-col-index">Index</th><th>Datum</th><th>Änderung</th><th>Bearbeitung</th></tr>
+        </thead>
+        <tbody>
+          {namedSnapshots.length ? (
+            namedSnapshots.map((snapshot, index) => (
+              <tr key={snapshot.id}>
+                <td>{String.fromCharCode(97 + (index % 26))}</td>
+                <td>{dateFormat.format(new Date(snapshot.createdAtIso))}</td>
+                <td>{snapshot.name}</td>
+                {/* Snapshots do not record an editor yet; the project's
+                    current editor is shown for every entry. */}
+                <td><Value value={project.projectEditor} /></td>
+              </tr>
+            ))
+          ) : (
+            <tr><td colSpan={4}>–</td></tr>
+          )}
+        </tbody>
+      </table>
+
+      <table className="pd-grid pd-block">
+        <caption>Inhalt</caption>
+        <tbody>
+          <tr><td className="pd-col-index">1</td><td>Verteilerübersicht und Leistungssummen</td></tr>
+          {entries.map((entry, index) => (
+            <tr key={entry.summary.board.id}>
+              <td className="pd-col-index">2.{index + 1}</td>
+              <td>Verteilerplan {boardLabel(entry)}</td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+      <SheetFooter project={project} stand={stand} />
+    </section>
+  );
+}
+
+function StructureNode({
+  entry,
+  entries,
+}: {
+  entry: PrintBoardHierarchyEntry;
+  entries: PrintBoardHierarchyEntry[];
+}) {
+  const children = entries.filter(
+    (candidate) => candidate.parentBoardId === entry.summary.board.id
+  );
+  const { board } = entry.summary;
+  return (
+    <li>
+      <div className="pd-node">
+        <strong>{board.boardNumber ?? board.name}</strong>
+        {board.boardNumber ? <span>{board.name}</span> : null}
+        <em>{formatKilowatt(entry.summary.demandPowerKw)} kW</em>
+      </div>
+      {children.length ? (
+        <ul>
+          {children.map((child) => (
+            <StructureNode entries={entries} entry={child} key={child.summary.board.id} />
+          ))}
+        </ul>
+      ) : null}
+    </li>
+  );
+}
+
+function OverviewSheet({
+  project,
+  entries,
+  logoSrc,
+  stand,
+}: {
+  project: ProjectDto;
+  entries: PrintBoardHierarchyEntry[];
+  logoSrc: string | null;
+  stand: string;
+}) {
+  const roots = entries.filter((entry) => entry.parentBoardId === null);
+  // Top-level boards whose "fed from" text names no other board are grouped
+  // below that text as an external feed (e.g. "HAK / Zähleranlage").
+  const feedGroups = new Map<string, PrintBoardHierarchyEntry[]>();
+  for (const root of roots) {
+    const feed = root.summary.board.fedFrom ?? "";
+    feedGroups.set(feed, [...(feedGroups.get(feed) ?? []), root]);
+  }
+  const sum =(pick: (entry: PrintBoardHierarchyEntry) => number) =>
+    entries.reduce((total, entry) => total + pick(entry), 0);
+  return (
+    <section className="pd-sheet pd-landscape">
+      <TitleBlock
+        kicker="Übersicht"
+        logoSrc={logoSrc}
+        name="Verteilerübersicht und Leistungssummen"
+        project={project}
+        rows={[
+          ["Verteiler", String(entries.length)],
+          ["Netz", `${project.threePhaseVoltageV} / ${project.singlePhaseVoltageV} V`],
+        ]}
+        stand={stand}
+      />
+      <div className="pd-overview">
+        <div className="pd-structure">
+          <h2>Versorgungsstruktur</h2>
+          <ul className="pd-tree">
+            {[...feedGroups].map(([feed, feedRoots]) => {
+              const nodes = feedRoots.map((root) => (
+                <StructureNode entries={entries} entry={root} key={root.summary.board.id} />
+              ));
+              return feed ? (
+                <li key={`feed:${feed}`}>
+                  <div className="pd-node pd-feed">
+                    <strong>Einspeisung</strong>
+                    <span>{feed}</span>
+                  </div>
+                  <ul>{nodes}</ul>
+                </li>
+              ) : (
+                nodes
+              );
+            })}
+          </ul>
+        </div>
+        <div>
+          <table className="pd-grid pd-plan">
+            <thead>
+              <tr>
+                <th>Nr.</th><th>Bezeichnung</th><th>Örtlichkeit</th><th>Etage</th><th>Netz</th><th>Gespeist von</th>
+                <th className="pd-r">SK</th>
+                <th className="pd-r">P<sub>inst</sub><br />[kW]</th>
+                <th className="pd-r">P<sub>Geräte</sub><br />[kW]</th>
+                <th className="pd-r">GZF<br />Vert.</th>
+                <th className="pd-r">P<sub>gl</sub><br />[kW]</th>
+                <th className="pd-r">I<sub>B</sub><br />[A]</th>
+                <th className="pd-r">Σ inkl.<br />unterlagert [kW]</th>
+              </tr>
+            </thead>
+            <tbody>
+              {entries.map((entry) => {
+                const { board } = entry.summary;
+                return (
+                  <tr key={board.id}>
+                    <td style={{ paddingLeft: `${1.6 + entry.depth * 3.5}mm` }}>
+                      {entry.depth ? "└ " : ""}
+                      <strong>{board.boardNumber ?? "–"}</strong>
+                    </td>
+                    <td>{board.name}</td>
+                    <td>{board.location ?? "–"}</td>
+                    <td>{entry.summary.floorName ?? "–"}</td>
+                    <td>{board.supplyType ?? "–"}</td>
+                    <td>{board.fedFrom ?? "–"}</td>
+                    <td className="pd-r">{entry.summary.circuitCount}</td>
+                    <td className="pd-r">{formatKilowatt(entry.summary.installedPowerKw)}</td>
+                    <td className="pd-r">{formatKilowatt(entry.summary.devicePowerKw)}</td>
+                    <td className="pd-r">{formatFactor(entry.summary.simultaneityFactor)}</td>
+                    <td className="pd-r"><strong>{formatKilowatt(entry.summary.demandPowerKw)}</strong></td>
+                    <td className="pd-r">{formatCurrent(entry.summary.designCurrentA)}</td>
+                    <td className="pd-r">{formatKilowatt(entry.cumulatedDemandPowerKw)}</td>
+                  </tr>
+                );
+              })}
+            </tbody>
+            <tfoot>
+              <tr>
+                <td colSpan={7}>Summe aller Verteiler (ohne übergeordneten GZF)</td>
+                <td className="pd-r">{formatKilowatt(sum((entry) => entry.summary.installedPowerKw))}</td>
+                <td className="pd-r">{formatKilowatt(sum((entry) => entry.summary.devicePowerKw))}</td>
+                <td />
+                <td className="pd-r">{formatKilowatt(sum((entry) => entry.summary.demandPowerKw))}</td>
+                <td />
+                <td />
+              </tr>
+            </tfoot>
+          </table>
+          <p className="pd-note">
+            <strong>Vorläufig:</strong> „Gespeist von“ ist noch ein Freitextfeld. Struktur und
+            „Σ inkl. unterlagert“ werden nur über eindeutig passende Verteilernummern bzw.
+            -bezeichnungen zugeordnet und einfach addiert (kein übergeordneter GZF).
+            Mehrdeutige Angaben bleiben ohne Zuordnung. Die fachliche
+            Verknüpfung und Summierung folgt.
+          </p>
+          <p className="pd-legend">
+            P<sub>inst</sub> = Anzahl × Leistung je Stück · P<sub>Geräte</sub> = mit Geräte-GZF ·
+            P<sub>gl</sub> = mit Verteiler-GZF · I<sub>B</sub> = S / (√3 · {project.threePhaseVoltageV} V),
+            S aus cos φ je Gerätezeile
+          </p>
+        </div>
+      </div>
+      <SheetFooter project={project} stand={stand} />
+    </section>
+  );
+}
+
+const planColumnCount = 11;
+
+function roomLabel(row: CircuitTreeDeviceRowDto) {
+  return row.roomNumberSnapshot
+    ? `${row.roomNumberSnapshot} ${row.roomNameSnapshot ?? ""}`.trim()
+    : "–";
+}
+
+function ComponentRow({ component }: { component: CircuitTreeComponentDto }) {
+  return (
+    <tr className="pd-component">
+      <td className="pd-bmk">{component.equipmentIdentifier}</td>
+      <td colSpan={6}>{component.name}</td>
+      <td>{formatProtectionDevice(component.protectionDevice) ?? "–"}</td>
+      <td colSpan={3} />
+    </tr>
+  );
+}
+
+function CircuitRows({ circuit }: { circuit: CircuitTreeCircuitDto }) {
+  const rows = circuit.deviceRows;
+  const circuitCells = (
+    <>
+      <td>{formatProtectionDevice(circuit.protectionDevice) ?? <Open />}</td>
+      <td>{formatCircuitCable(circuit) ?? (circuit.isReserve ? "–" : <Open />)}</td>
+      <td className="pd-r">
+        {circuit.cableLength ?? (circuit.isReserve ? "–" : <Open />)}
+      </td>
+      <td>{circuit.remark ?? ""}</td>
+    </>
+  );
+  if (rows.length === 0) {
+    return (
+      <tr className="pd-circuit pd-reserve">
+        <td className="pd-bmk">{circuit.equipmentIdentifier}</td>
+        <td>{circuit.displayName ?? "Reserve"}</td>
+        <td>–</td>
+        <td /><td /><td />
+        <td className="pd-r">–</td>
+        {circuitCells}
+      </tr>
+    );
+  }
+  if (rows.length === 1) {
+    const row = rows[0];
+    const title = circuit.displayName ?? row.displayName;
+    return (
+      <tr className="pd-circuit">
+        <td className="pd-bmk">{circuit.equipmentIdentifier}</td>
+        <td>
+          {title}
+          {title !== row.displayName ? (
+            <span className="pd-sub"> · {row.displayName}</span>
+          ) : null}
+        </td>
+        <td>{roomLabel(row)}</td>
+        <td className="pd-r">{row.quantity}</td>
+        <td className="pd-r">{formatUnitPower(row.powerPerUnit)}</td>
+        <td className="pd-r">{formatFactor(row.simultaneityFactor)}</td>
+        <td className="pd-r"><strong>{formatKilowatt(circuit.circuitTotalPower)}</strong></td>
+        {circuitCells}
+      </tr>
+    );
+  }
+  return (
+    <>
+      <tr className="pd-circuit">
+        <td className="pd-bmk">{circuit.equipmentIdentifier}</td>
+        <td>{circuit.displayName ?? ""}</td>
+        <td /><td /><td /><td />
+        <td className="pd-r"><strong>{formatKilowatt(circuit.circuitTotalPower)}</strong></td>
+        {circuitCells}
+      </tr>
+      {rows.map((row) => (
+        <tr className="pd-device" key={row.id}>
+          <td />
+          <td>{row.displayName}</td>
+          <td>{roomLabel(row)}</td>
+          <td className="pd-r">{row.quantity}</td>
+          <td className="pd-r">{formatUnitPower(row.powerPerUnit)}</td>
+          <td className="pd-r">{formatFactor(row.simultaneityFactor)}</td>
+          <td className="pd-r">{formatKilowatt(row.rowTotalPower)}</td>
+          <td colSpan={4} />
+        </tr>
+      ))}
+    </>
+  );
+}
+
+function BoardPlanSheet({
+  entry,
+  project,
+  logoSrc,
+  stand,
+}: {
+  entry: PrintBoardHierarchyEntry;
+  project: ProjectDto;
+  logoSrc: string | null;
+  stand: string;
+}) {
+  const { summary } = entry;
+  const { board, tree } = summary;
+  return (
+    <section className="pd-sheet pd-landscape">
+      <table className="pd-grid pd-plan">
+        {/* The title block lives in <thead> so it repeats on every printed page. */}
+        <thead>
+          <tr>
+            <th className="pd-tb-cell" colSpan={planColumnCount}>
+              <TitleBlock
+                kicker="Verteilerplan"
+                logoSrc={logoSrc}
+                name={board.name}
+                number={board.boardNumber}
+                project={project}
+                rows={[
+                  ["Örtlichkeit", [board.location, summary.floorName].filter(Boolean).join(" · ") || "–"],
+                  ["Netzart", board.supplyType ?? "–"],
+                  ["Gespeist von", board.fedFrom ?? "–"],
+                  [
+                    <>P<sub>gl</sub></>,
+                    <>
+                      {formatKilowatt(summary.demandPowerKw)} kW · I<sub>B</sub>{" "}
+                      {formatCurrent(summary.designCurrentA)} A
+                    </>,
+                  ],
+                ]}
+                stand={stand}
+              />
+            </th>
+          </tr>
+          <tr className="pd-head">
+            <th>SK-Nr.</th><th>Bezeichnung</th><th>Raum</th>
+            <th className="pd-r">Anz.</th>
+            <th className="pd-r">P/Stk.<br />[kW]</th>
+            <th className="pd-r">GZF</th>
+            <th className="pd-r">P<br />[kW]</th>
+            <th>Schutz</th><th>Kabel</th>
+            <th className="pd-r">Länge<br />[m]</th>
+            <th>Bemerkung</th>
+          </tr>
+        </thead>
+        <tbody>
+          {tree.headerComponents.map((component) => (
+            <ComponentRow component={component} key={component.id} />
+          ))}
+          {tree.sections.map((section) => (
+            <SectionRows key={section.id} section={section} />
+          ))}
+          {tree.footerComponents.map((component) => (
+            <ComponentRow component={component} key={component.id} />
+          ))}
+        </tbody>
+        <tfoot>
+          <tr>
+            <td />
+            <td colSpan={5}>
+              Summe Verteiler (P<sub>inst</sub> {formatKilowatt(summary.installedPowerKw)} kW)
+            </td>
+            <td className="pd-r">{formatKilowatt(summary.devicePowerKw)}</td>
+            <td colSpan={4} />
+          </tr>
+          <tr>
+            <td />
+            <td colSpan={5}>Gleichzeitigkeitsfaktor Verteiler</td>
+            <td className="pd-r">{formatFactor(summary.simultaneityFactor)}</td>
+            <td colSpan={4} />
+          </tr>
+          <tr className="pd-grand">
+            <td />
+            <td colSpan={5}>Gleichzeitige Leistung P<sub>gl</sub></td>
+            <td className="pd-r">{formatKilowatt(summary.demandPowerKw)}</td>
+            <td colSpan={4}>I<sub>B</sub> ≈ {formatCurrent(summary.designCurrentA)} A</td>
+          </tr>
+        </tfoot>
+      </table>
+      <SheetFooter project={project} stand={stand} />
+    </section>
+  );
+}
+
+function SectionRows({
+  section,
+}: {
+  section: PrintBoardHierarchyEntry["summary"]["tree"]["sections"][number];
+}) {
+  return (
+    <>
+      <tr className="pd-group">
+        <td className="pd-bmk">{section.prefix}</td>
+        <td colSpan={planColumnCount - 1}>{section.displayName}</td>
+      </tr>
+      {section.components.map((component) => (
+        <ComponentRow component={component} key={component.id} />
+      ))}
+      {section.circuits.map((circuit) => (
+        <CircuitRows circuit={circuit} key={circuit.id} />
+      ))}
+      <tr className="pd-subtotal">
+        <td />
+        <td colSpan={5}>Summe {section.displayName}</td>
+        <td className="pd-r">{formatKilowatt(section.sectionTotalPower)}</td>
+        <td colSpan={4} />
+      </tr>
+    </>
+  );
+}
+
+export function PrintDocument({
+  project,
+  office,
+  entries,
+  namedSnapshots,
+  logoSrc,
+  printedAt,
+}: PrintDocumentProps) {
+  const stand = dateFormat.format(printedAt);
+  return (
+    <div className="pd-pages">
+      <CoverSheet
+        entries={entries}
+        logoSrc={logoSrc}
+        namedSnapshots={namedSnapshots}
+        office={office}
+        project={project}
+        stand={stand}
+      />
+      <OverviewSheet entries={entries} logoSrc={logoSrc} project={project} stand={stand} />
+      {entries.map((entry) => (
+        <BoardPlanSheet
+          entry={entry}
+          key={entry.summary.board.id}
+          logoSrc={logoSrc}
+          project={project}
+          stand={stand}
+        />
+      ))}
+    </div>
+  );
+}

src/frontend/types.ts

@@ -93,9 +93,18 @@ export interface ProjectDto {
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
+  siteAddress: string | null;
+  workStage: string | null;
+  projectLead: string | null;
+  projectEditor: string | null;
   currentRevision: number;
 }
 
+export interface OfficeProfileDto {
+  officeName: string | null;
+  officeAddress: string | null;
+}
+
 export interface ProjectHistoryStateDto {
   projectId: string;
   currentRevision: number;
@@ -172,7 +181,14 @@ export interface ProjectCommandResultDto {
   history: ProjectHistoryStateDto;
 }
 
-export interface DistributionBoardDto {
+export interface DistributionBoardInfoDto {
+  boardNumber: string | null;
+  location: string | null;
+  fedFrom: string | null;
+  remark: string | null;
+}
+
+export interface DistributionBoardDto extends DistributionBoardInfoDto {
   id: string;
   projectId: string;
   name: string;
@@ -181,6 +197,13 @@ export interface DistributionBoardDto {
   simultaneityFactor: number;
 }
 
+export interface DocumentLogoMetadataDto {
+  mimeType: string;
+  fileName: string | null;
+  sizeBytes: number;
+  updatedAtIso: string;
+}
+
 export interface DistributionBoardCommandResultDto
   extends ProjectCommandResultDto {
   distributionBoard: DistributionBoardDto;
@@ -203,11 +226,24 @@ export interface CircuitListDto {
   name: string;
 }
 
+export interface BuildingDto {
+  id: string;
+  projectId: string;
+  name: string;
+  sortOrder: number;
+}
+
+export interface ProjectBuildingCommandResultDto
+  extends ProjectCommandResultDto {
+  building: BuildingDto;
+}
+
 export interface FloorDto {
   id: string;
   projectId: string;
   name: string;
   sortOrder: number;
+  buildingId: string | null;
 }
 
 export interface ProjectFloorCommandResultDto
@@ -265,8 +301,14 @@ export interface ProjectDeviceCommandResultDto
   projectDevice: ProjectDeviceDto;
 }
 
+export interface CreateBuildingInput {
+  name: string;
+}
+
 export interface CreateFloorInput {
   name: string;
+  /** Omitted = keep the current assignment on update; null = no building. */
+  buildingId?: string | null;
 }
 
 export interface CreateRoomInput {

src/frontend/utils/api.ts

@@ -1,5 +1,7 @@
 import type {
+  BuildingDto,
   CircuitListDto,
+  CreateBuildingInput,
   CreateFloorInput,
   CreateProjectDeviceInput,
   CreateRoomInput,
@@ -8,12 +10,16 @@ import type {
   DistributionBoardCommandResultDto,
   DistributionBoardCopyCommandResultDto,
   DistributionBoardDeleteCommandResultDto,
+  DistributionBoardInfoDto,
+  DocumentLogoMetadataDto,
   FloorDto,
+  OfficeProfileDto,
   GlobalDeviceDto,
   ProjectCommandDto,
   ProjectCommandResultDto,
   ProjectDeviceCommandResultDto,
   ProjectDeviceDto,
+  ProjectBuildingCommandResultDto,
   ProjectFloorCommandResultDto,
   ProjectHistoryStateDto,
   ProjectRevisionPageDto,
@@ -256,7 +262,7 @@ export function updateProjectSettings(
     singlePhaseVoltageV: number;
     threePhaseVoltageV: number;
     enabledDistributionBoardSupplyTypes: ProjectDto["enabledDistributionBoardSupplyTypes"];
-  }
+  } & Partial<Pick<ProjectDto, "siteAddress" | "workStage" | "projectLead" | "projectEditor">>
 ) {
   return request<ProjectSettingsCommandResultDto>(
     `/api/projects/${projectId}`,
@@ -329,7 +335,7 @@ export function updateDistributionBoard(
     floorId: string | null;
     supplyType: NonNullable<DistributionBoardDto["supplyType"]>;
     simultaneityFactor: number;
-  },
+  } & Partial<DistributionBoardInfoDto>,
   expectedRevision: number
 ) {
   return request<DistributionBoardCommandResultDto>(
@@ -341,6 +347,42 @@ export function updateDistributionBoard(
   );
 }
 
+export const documentLogoUrl = "/api/document-branding/logo";
+
+export function getDocumentBranding() {
+  return request<{
+    logo: DocumentLogoMetadataDto | null;
+    office: OfficeProfileDto;
+  }>("/api/document-branding");
+}
+
+export function updateOfficeProfile(office: OfficeProfileDto) {
+  return request<{ office: OfficeProfileDto }>("/api/document-branding/office", {
+    method: "PUT",
+    body: JSON.stringify(office),
+  });
+}
+
+export async function uploadDocumentLogo(file: File) {
+  const bytes = new Uint8Array(await file.arrayBuffer());
+  let binary = "";
+  for (let index = 0; index < bytes.length; index += 0x8000) {
+    binary += String.fromCharCode(...bytes.subarray(index, index + 0x8000));
+  }
+  return request<{ logo: DocumentLogoMetadataDto }>(documentLogoUrl, {
+    method: "PUT",
+    body: JSON.stringify({
+      fileName: file.name,
+      mimeType: file.type,
+      contentBase64: btoa(binary),
+    }),
+  });
+}
+
+export function deleteDocumentLogo() {
+  return request<void>(documentLogoUrl, { method: "DELETE" });
+}
+
 export function getExternalCsvConfiguration(projectId: string) {
   return request<{ configuration: ExternalCsvConfigurationSnapshotDto | null }>(
     `/api/projects/${projectId}/external-csv/configuration`
@@ -842,6 +884,61 @@ export function renumberCircuitSectionCommand(
   );
 }
 
+export function listBuildings(projectId: string) {
+  return request<BuildingDto[]>(`/api/projects/${projectId}/buildings`);
+}
+
+export function createBuilding(
+  projectId: string,
+  input: CreateBuildingInput,
+  expectedRevision: number
+) {
+  return request<ProjectBuildingCommandResultDto>(
+    `/api/projects/${projectId}/buildings`,
+    {
+      method: "POST",
+      body: JSON.stringify({ name: input.name, expectedRevision }),
+    }
+  );
+}
+
+export function updateBuilding(
+  projectId: string,
+  buildingId: string,
+  input: CreateBuildingInput,
+  expectedRevision: number
+) {
+  return request<ProjectBuildingCommandResultDto>(
+    `/api/projects/${projectId}/buildings/${buildingId}`,
+    {
+      method: "PUT",
+      body: JSON.stringify({ name: input.name, expectedRevision }),
+    }
+  );
+}
+
+export function deleteBuilding(
+  projectId: string,
+  buildingId: string,
+  expectedRevision: number
+) {
+  return request<ProjectCommandResultDto>(
+    `/api/projects/${projectId}/buildings/${buildingId}`,
+    {
+      method: "DELETE",
+      body: JSON.stringify({ expectedRevision }),
+    }
+  );
+}
+
+// buildingId is only sent when the caller passes it (string or null);
+// an omitted buildingId keeps the current assignment on update.
+function toFloorRequestBody(input: CreateFloorInput, expectedRevision: number) {
+  return input.buildingId === undefined
+    ? { name: input.name, expectedRevision }
+    : { name: input.name, buildingId: input.buildingId, expectedRevision };
+}
+
 export function listFloors(projectId: string) {
   return request<FloorDto[]>(`/api/projects/${projectId}/floors`);
 }
@@ -855,7 +952,7 @@ export function createFloor(
     `/api/projects/${projectId}/floors`,
     {
       method: "POST",
-      body: JSON.stringify({ ...input, expectedRevision }),
+      body: JSON.stringify(toFloorRequestBody(input, expectedRevision)),
     }
   );
 }
@@ -868,7 +965,7 @@ export function updateFloor(
 ) {
   return request<ProjectFloorCommandResultDto>(`/api/projects/${projectId}/floors/${floorId}`, {
     method: "PUT",
-    body: JSON.stringify({ ...input, expectedRevision }),
+    body: JSON.stringify(toFloorRequestBody(input, expectedRevision)),
   });
 }
 

src/frontend/utils/building-structure.ts

@@ -0,0 +1,284 @@
+// Pure selection, filtering and grouping rules for the building structure
+// view (Gebäude → Etagen → Räume) and grouped floor selects.
+import type { BuildingDto, FloorDto, RoomDto } from "../types";
+
+/** Selection key for "Alle" in the building and floor columns. */
+export const ALL_SELECTION = "__all__";
+/** Selection key for "Ohne Gebäude" / "Ohne Etage". */
+export const UNASSIGNED_SELECTION = "__unassigned__";
+
+/** ALL_SELECTION, UNASSIGNED_SELECTION or a building/floor id. */
+export type StructureSelection = string;
+
+export const UNASSIGNED_BUILDING_LABEL = "Ohne Gebäude";
+export const UNASSIGNED_FLOOR_LABEL = "Ohne Etage";
+
+type BuildingLike = Pick<BuildingDto, "id" | "name">;
+type FloorLike = Pick<FloorDto, "id" | "name"> & {
+  buildingId?: string | null;
+};
+type RoomLike = Pick<RoomDto, "floorId">;
+
+export interface FloorGroup<TFloor extends FloorLike = FloorLike> {
+  /** null for floors without (known) building. */
+  buildingId: string | null;
+  label: string;
+  floors: TFloor[];
+}
+
+/**
+ * The building a floor belongs to, or null when it has none or references a
+ * building that is not (or no longer) loaded.
+ */
+export function resolveFloorBuildingId(
+  floor: FloorLike,
+  buildingIds: ReadonlySet<string>
+): string | null {
+  const buildingId = floor.buildingId ?? null;
+  return buildingId !== null && buildingIds.has(buildingId)
+    ? buildingId
+    : null;
+}
+
+function toIdSet(entries: ReadonlyArray<{ id: string }>) {
+  return new Set(entries.map((entry) => entry.id));
+}
+
+export function hasFloorsWithoutBuilding(
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>
+): boolean {
+  const buildingIds = toIdSet(buildings);
+  return floors.some(
+    (floor) => resolveFloorBuildingId(floor, buildingIds) === null
+  );
+}
+
+export function hasRoomsWithoutFloor(
+  rooms: ReadonlyArray<RoomLike>,
+  floors: ReadonlyArray<FloorLike>
+): boolean {
+  const floorIds = toIdSet(floors);
+  return rooms.some(
+    (room) => room.floorId === null || !floorIds.has(room.floorId)
+  );
+}
+
+/**
+ * Groups floors by building in building order; floors without a known
+ * building come last under "Ohne Gebäude". Empty groups are omitted and the
+ * floor order inside a group is preserved.
+ */
+export function groupFloorsByBuilding<TFloor extends FloorLike>(
+  floors: ReadonlyArray<TFloor>,
+  buildings: ReadonlyArray<BuildingLike>
+): FloorGroup<TFloor>[] {
+  const buildingIds = toIdSet(buildings);
+  const floorsByBuilding = new Map<string | null, TFloor[]>();
+  for (const floor of floors) {
+    const buildingId = resolveFloorBuildingId(floor, buildingIds);
+    const group = floorsByBuilding.get(buildingId) ?? [];
+    group.push(floor);
+    floorsByBuilding.set(buildingId, group);
+  }
+  const groups: FloorGroup<TFloor>[] = [];
+  for (const building of buildings) {
+    const groupFloors = floorsByBuilding.get(building.id);
+    if (groupFloors?.length) {
+      groups.push({
+        buildingId: building.id,
+        label: building.name,
+        floors: groupFloors,
+      });
+    }
+  }
+  const unassigned = floorsByBuilding.get(null);
+  if (unassigned?.length) {
+    groups.push({
+      buildingId: null,
+      label: UNASSIGNED_BUILDING_LABEL,
+      floors: unassigned,
+    });
+  }
+  return groups;
+}
+
+/** Floors shown in the floor column for a building selection. */
+export function filterFloorsByBuilding<TFloor extends FloorLike>(
+  floors: ReadonlyArray<TFloor>,
+  buildings: ReadonlyArray<BuildingLike>,
+  buildingSelection: StructureSelection
+): TFloor[] {
+  if (buildingSelection === ALL_SELECTION) {
+    return [...floors];
+  }
+  const buildingIds = toIdSet(buildings);
+  const targetBuildingId =
+    buildingSelection === UNASSIGNED_SELECTION ? null : buildingSelection;
+  return floors.filter(
+    (floor) => resolveFloorBuildingId(floor, buildingIds) === targetBuildingId
+  );
+}
+
+/**
+ * "Ohne Etage" is offered only when rooms without floor exist and the
+ * building selection can contain them ("Alle" or "Ohne Gebäude"), because a
+ * room without floor has no building either.
+ */
+export function showsRoomsWithoutFloorEntry(
+  rooms: ReadonlyArray<RoomLike>,
+  floors: ReadonlyArray<FloorLike>,
+  buildingSelection: StructureSelection
+): boolean {
+  return (
+    (buildingSelection === ALL_SELECTION ||
+      buildingSelection === UNASSIGNED_SELECTION) &&
+    hasRoomsWithoutFloor(rooms, floors)
+  );
+}
+
+/** Rooms shown in the room column for the current selections. */
+export function filterRooms<TRoom extends RoomLike>(
+  rooms: ReadonlyArray<TRoom>,
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>,
+  buildingSelection: StructureSelection,
+  floorSelection: StructureSelection
+): TRoom[] {
+  const floorIds = toIdSet(floors);
+  const isWithoutFloor = (room: RoomLike) =>
+    room.floorId === null || !floorIds.has(room.floorId);
+
+  if (floorSelection === UNASSIGNED_SELECTION) {
+    return showsRoomsWithoutFloorEntry(rooms, floors, buildingSelection)
+      ? rooms.filter(isWithoutFloor)
+      : [];
+  }
+  if (floorSelection !== ALL_SELECTION) {
+    return rooms.filter((room) => room.floorId === floorSelection);
+  }
+  if (buildingSelection === ALL_SELECTION) {
+    return [...rooms];
+  }
+  const visibleFloorIds = toIdSet(
+    filterFloorsByBuilding(floors, buildings, buildingSelection)
+  );
+  return rooms.filter(
+    (room) =>
+      (room.floorId !== null && visibleFloorIds.has(room.floorId)) ||
+      (buildingSelection === UNASSIGNED_SELECTION && isWithoutFloor(room))
+  );
+}
+
+/** Falls back to "Alle" when a selected building vanished. */
+export function normalizeBuildingSelection(
+  selection: StructureSelection,
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>
+): StructureSelection {
+  if (selection === ALL_SELECTION) {
+    return selection;
+  }
+  if (selection === UNASSIGNED_SELECTION) {
+    return hasFloorsWithoutBuilding(floors, buildings)
+      ? selection
+      : ALL_SELECTION;
+  }
+  return buildings.some((building) => building.id === selection)
+    ? selection
+    : ALL_SELECTION;
+}
+
+/** Falls back to "Alle" when a selected floor is no longer visible. */
+export function normalizeFloorSelection(
+  selection: StructureSelection,
+  rooms: ReadonlyArray<RoomLike>,
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>,
+  buildingSelection: StructureSelection
+): StructureSelection {
+  if (selection === ALL_SELECTION) {
+    return selection;
+  }
+  if (selection === UNASSIGNED_SELECTION) {
+    return showsRoomsWithoutFloorEntry(rooms, floors, buildingSelection)
+      ? selection
+      : ALL_SELECTION;
+  }
+  return filterFloorsByBuilding(floors, buildings, buildingSelection).some(
+    (floor) => floor.id === selection
+  )
+    ? selection
+    : ALL_SELECTION;
+}
+
+/** Building preselected in the floor dialog ("" = Ohne Gebäude). */
+export function defaultBuildingIdForNewFloor(
+  buildingSelection: StructureSelection
+): string {
+  return buildingSelection === ALL_SELECTION ||
+    buildingSelection === UNASSIGNED_SELECTION
+    ? ""
+    : buildingSelection;
+}
+
+/** Floor preselected in the room dialog ("" = Ohne Etage). */
+export function defaultFloorIdForNewRoom(
+  floorSelection: StructureSelection
+): string {
+  return floorSelection === ALL_SELECTION ||
+    floorSelection === UNASSIGNED_SELECTION
+    ? ""
+    : floorSelection;
+}
+
+export function countFloorsByBuilding(
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>
+): Map<string | null, number> {
+  const buildingIds = toIdSet(buildings);
+  const counts = new Map<string | null, number>();
+  for (const floor of floors) {
+    const buildingId = resolveFloorBuildingId(floor, buildingIds);
+    counts.set(buildingId, (counts.get(buildingId) ?? 0) + 1);
+  }
+  return counts;
+}
+
+/** Room counts per floor id; rooms without known floor count under null. */
+export function countRoomsByFloor(
+  rooms: ReadonlyArray<RoomLike>,
+  floors: ReadonlyArray<FloorLike>
+): Map<string | null, number> {
+  const floorIds = toIdSet(floors);
+  const counts = new Map<string | null, number>();
+  for (const room of rooms) {
+    const floorId =
+      room.floorId !== null && floorIds.has(room.floorId)
+        ? room.floorId
+        : null;
+    counts.set(floorId, (counts.get(floorId) ?? 0) + 1);
+  }
+  return counts;
+}
+
+/** "EG · Haus A", "EG" (floor without building) or "Ohne Etage". */
+export function describeRoomLocation(
+  room: RoomLike,
+  floors: ReadonlyArray<FloorLike>,
+  buildings: ReadonlyArray<BuildingLike>
+): string {
+  const floor =
+    room.floorId === null
+      ? undefined
+      : floors.find((entry) => entry.id === room.floorId);
+  if (!floor) {
+    return UNASSIGNED_FLOOR_LABEL;
+  }
+  const buildingId = resolveFloorBuildingId(floor, toIdSet(buildings));
+  const building =
+    buildingId === null
+      ? undefined
+      : buildings.find((entry) => entry.id === buildingId);
+  return building ? `${floor.name} · ${building.name}` : floor.name;
+}

src/frontend/utils/project-version-history.ts

@@ -46,6 +46,9 @@ const commandTypeLabels: Record<string, string> = {
   "circuit.move-group": "Stromkreis in andere Gruppe verschoben",
   "circuit-group.delete-subtree": "Stromkreisgruppe vollständig entfernt",
   "circuit-group.restore-subtree": "Stromkreisgruppe vollständig wiederhergestellt",
+  "project-building.insert": "Gebäude angelegt",
+  "project-building.update": "Gebäude bearbeitet",
+  "project-building.delete": "Gebäude entfernt",
   "project-floor.insert": "Geschoss angelegt",
   "project-floor.update": "Geschoss bearbeitet",
   "project-floor.delete": "Geschoss entfernt",

src/server/composition/application-repositories.ts

@@ -6,6 +6,7 @@ import { CircuitRepository } from "../../db/repositories/circuit.repository.js";
 import { CircuitProtectionDeviceRepository } from "../../db/repositories/circuit-protection-device.repository.js";
 import { DistributionBoardComponentRepository } from "../../db/repositories/distribution-board-component.repository.js";
 import { DistributionBoardRepository } from "../../db/repositories/distribution-board.repository.js";
+import { BuildingRepository } from "../../db/repositories/building.repository.js";
 import { FloorRepository } from "../../db/repositories/floor.repository.js";
 import { GlobalDeviceRepository } from "../../db/repositories/global-device.repository.js";
 import { ProjectDeviceRepository } from "../../db/repositories/project-device.repository.js";
@@ -13,6 +14,7 @@ import { ProjectRepository } from "../../db/repositories/project.repository.js";
 import { RoomRepository } from "../../db/repositories/room.repository.js";
 import { ExternalCsvConfigurationRepository } from "../../db/repositories/external-csv-configuration.repository.js";
 import { ExternalModelStateRepository } from "../../db/repositories/external-model-state.repository.js";
+import { DocumentBrandingRepository } from "../../db/repositories/document-branding.repository.js";
 
 export const circuitDeviceRowRepository =
   new CircuitDeviceRowRepository(db);
@@ -25,6 +27,7 @@ export const distributionBoardComponentRepository =
   new DistributionBoardComponentRepository(db);
 export const distributionBoardRepository =
   new DistributionBoardRepository(db);
+export const buildingRepository = new BuildingRepository(db);
 export const floorRepository = new FloorRepository(db);
 export const globalDeviceRepository = new GlobalDeviceRepository(db);
 export const projectDeviceRepository = new ProjectDeviceRepository(db);
@@ -33,3 +36,4 @@ export const roomRepository = new RoomRepository(db);
 export const externalCsvConfigurationRepository =
   new ExternalCsvConfigurationRepository(db);
 export const externalModelStateRepository = new ExternalModelStateRepository(db);
+export const documentBrandingRepository = new DocumentBrandingRepository(db);

src/server/controllers/building.controller.ts

@@ -0,0 +1,111 @@
+import type { Request, Response } from "express";
+import {
+  createProjectBuildingDeleteProjectCommand,
+  createProjectBuildingInsertProjectCommand,
+  createProjectBuildingSnapshot,
+  createProjectBuildingUpdateProjectCommand,
+} from "../../domain/models/project-location-structure-project-command.model.js";
+import {
+  createBuildingSchema,
+  deleteProjectLocationSchema,
+  updateBuildingSchema,
+} from "../../shared/validation/project-structure.schemas.js";
+import { projectCommandService } from "../composition/project-command-stores.js";
+import { buildingRepository } from "../composition/application-repositories.js";
+import { respondWithProjectCommandError } from "./project-command.controller.js";
+
+export async function listBuildingsByProject(req: Request, res: Response) {
+  const { projectId } = req.params;
+  if (typeof projectId !== "string") {
+    return res.status(400).json({ error: "Invalid projectId" });
+  }
+
+  const result = await buildingRepository.listByProject(projectId);
+  return res.json(result);
+}
+
+export async function createBuilding(req: Request, res: Response) {
+  const { projectId } = req.params;
+  if (typeof projectId !== "string") {
+    return res.status(400).json({ error: "Invalid projectId" });
+  }
+
+  const parsed = createBuildingSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+
+  const existingBuildings = await buildingRepository.listByProject(projectId);
+  const nextSortOrder = existingBuildings.length
+    ? Math.max(...existingBuildings.map((building) => building.sortOrder)) + 1
+    : 0;
+  const building = createProjectBuildingSnapshot(
+    projectId,
+    parsed.data.name,
+    nextSortOrder
+  );
+  try {
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Gebäude anlegen",
+      command: createProjectBuildingInsertProjectCommand(building),
+    });
+    return res.status(201).json({ ...result, building });
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export async function updateBuilding(req: Request, res: Response) {
+  const { projectId, buildingId } = req.params;
+  if (typeof projectId !== "string" || typeof buildingId !== "string") {
+    return res.status(400).json({ error: "Invalid parameters" });
+  }
+  const parsed = updateBuildingSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  const current = await buildingRepository.findById(projectId, buildingId);
+  if (!current) {
+    return res.status(404).json({ error: "Building not found" });
+  }
+  const target = { ...current, name: parsed.data.name };
+  try {
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Gebäude bearbeiten",
+      command: createProjectBuildingUpdateProjectCommand(current, target),
+    });
+    return res.json({ ...result, building: target });
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export async function deleteBuilding(req: Request, res: Response) {
+  const { projectId, buildingId } = req.params;
+  if (typeof projectId !== "string" || typeof buildingId !== "string") {
+    return res.status(400).json({ error: "Invalid parameters" });
+  }
+  const parsed = deleteProjectLocationSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  const current = await buildingRepository.findById(projectId, buildingId);
+  if (!current) {
+    return res.status(404).json({ error: "Building not found" });
+  }
+  try {
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Gebäude löschen",
+      command: createProjectBuildingDeleteProjectCommand(current),
+    });
+    return res.json(result);
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}

src/server/controllers/distribution-board.controller.ts

@@ -9,6 +9,7 @@ import {
   createDistributionBoardInsertSubtreeProjectCommand,
 } from "../../domain/models/distribution-board-subtree-project-command.model.js";
 import { cloneDistributionBoardSubtree } from "../../domain/models/distribution-board-subtree-snapshot.model.js";
+import { distributionBoardInfoFields } from "../../shared/constants/distribution-board.js";
 import {
   copyDistributionBoardSchema,
   createDistributionBoardSchema,
@@ -64,6 +65,10 @@ export async function createDistributionBoard(req: Request, res: Response) {
       distributionBoard: {
         ...structure.distributionBoard,
         simultaneityFactor: 1,
+        boardNumber: null,
+        location: null,
+        fedFrom: null,
+        remark: null,
       },
     });
   } catch (error) {
@@ -86,6 +91,13 @@ export async function updateDistributionBoard(
   if (!parsed.success) {
     return res.status(400).json({ error: parsed.error.flatten() });
   }
+  // Info fields are optional in the request; only submitted fields become
+  // part of the command and therefore of its inverse.
+  const infoPatch = Object.fromEntries(
+    distributionBoardInfoFields
+      .filter((field) => parsed.data[field] !== undefined)
+      .map((field) => [field, parsed.data[field]])
+  );
   try {
     const result = projectCommandService.executeUser({
       projectId,
@@ -97,6 +109,7 @@ export async function updateDistributionBoard(
           floorId: parsed.data.floorId,
           supplyType: parsed.data.supplyType,
           simultaneityFactor: parsed.data.simultaneityFactor,
+          ...infoPatch,
         }
       ),
     });

src/server/controllers/document-branding.controller.ts

@@ -0,0 +1,100 @@
+import type { Request, Response } from "express";
+import type { DocumentBrandingAsset } from "../../db/schema/document-branding-assets.js";
+import { officeProfileFields } from "../../shared/constants/project-cover.js";
+import {
+  maxDocumentLogoBytes,
+  updateOfficeProfileSchema,
+  uploadDocumentLogoSchema,
+  type DocumentLogoMimeType,
+} from "../../shared/validation/document-branding.schemas.js";
+import { documentBrandingRepository } from "../composition/application-repositories.js";
+
+const logoKey = "logo";
+
+export function getDocumentBrandingHandler(_req: Request, res: Response) {
+  const logo = documentBrandingRepository.get(logoKey);
+  return res.json({
+    logo: logo ? toLogoMetadata(logo) : null,
+    office: documentBrandingRepository.getSettings(officeProfileFields),
+  });
+}
+
+export function updateOfficeProfileHandler(req: Request, res: Response) {
+  const parsed = updateOfficeProfileSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  documentBrandingRepository.setSettings(parsed.data);
+  return res.json({
+    office: documentBrandingRepository.getSettings(officeProfileFields),
+  });
+}
+
+export function getDocumentLogoHandler(_req: Request, res: Response) {
+  const logo = documentBrandingRepository.get(logoKey);
+  if (!logo) {
+    return res.status(404).json({ error: "No logo uploaded" });
+  }
+  res.setHeader("Content-Type", logo.mimeType);
+  res.setHeader("Cache-Control", "no-cache");
+  res.setHeader("X-Content-Type-Options", "nosniff");
+  // SVG uploads are rendered through <img> only; forbid script execution if
+  // the file is ever opened directly.
+  res.setHeader(
+    "Content-Security-Policy",
+    "default-src 'none'; style-src 'unsafe-inline'; img-src data:"
+  );
+  return res.send(logo.data);
+}
+
+export function uploadDocumentLogoHandler(req: Request, res: Response) {
+  const parsed = uploadDocumentLogoSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  const data = Buffer.from(parsed.data.contentBase64, "base64");
+  if (data.length === 0 || data.length > maxDocumentLogoBytes) {
+    return res
+      .status(400)
+      .json({ error: "Das Logo darf höchstens 2 MB groß sein." });
+  }
+  if (!matchesMimeType(data, parsed.data.mimeType)) {
+    return res.status(400).json({
+      error: "Der Dateiinhalt passt nicht zum angegebenen Bildformat.",
+    });
+  }
+  const logo = documentBrandingRepository.upsert({
+    key: logoKey,
+    mimeType: parsed.data.mimeType,
+    fileName: parsed.data.fileName,
+    data,
+  });
+  return res.json({ logo: toLogoMetadata(logo) });
+}
+
+export function deleteDocumentLogoHandler(_req: Request, res: Response) {
+  documentBrandingRepository.delete(logoKey);
+  return res.status(204).end();
+}
+
+function toLogoMetadata(logo: DocumentBrandingAsset) {
+  return {
+    mimeType: logo.mimeType,
+    fileName: logo.fileName,
+    sizeBytes: logo.data.length,
+    updatedAtIso: logo.updatedAt.toISOString(),
+  };
+}
+
+function matchesMimeType(data: Buffer, mimeType: DocumentLogoMimeType) {
+  if (mimeType === "image/png") {
+    return data
+      .subarray(0, 8)
+      .equals(Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]));
+  }
+  if (mimeType === "image/jpeg") {
+    return data[0] === 0xff && data[1] === 0xd8 && data[2] === 0xff;
+  }
+  const head = data.subarray(0, 2048).toString("utf8").toLowerCase();
+  return head.includes("<svg");
+}

src/server/controllers/floor.controller.ts

@@ -42,7 +42,8 @@ export async function createFloor(req: Request, res: Response) {
   const floor = createProjectFloorSnapshot(
     projectId,
     parsed.data.name,
-    nextSortOrder
+    nextSortOrder,
+    parsed.data.buildingId ?? null
   );
   try {
     const result = projectCommandService.executeUser({
@@ -70,7 +71,14 @@ export async function updateFloor(req: Request, res: Response) {
   if (!current) {
     return res.status(404).json({ error: "Floor not found" });
   }
-  const target = { ...current, name: parsed.data.name };
+  const target = {
+    ...current,
+    name: parsed.data.name,
+    buildingId:
+      parsed.data.buildingId === undefined
+        ? current.buildingId
+        : parsed.data.buildingId,
+  };
   try {
     const result = projectCommandService.executeUser({
       projectId,

src/server/controllers/project.controller.ts

@@ -4,6 +4,10 @@ import {
   updateProjectSettingsSchema,
 } from "../../shared/validation/project-structure.schemas.js";
 import { createProjectSettingsUpdateProjectCommand } from "../../domain/models/project-settings-project-command.model.js";
+import {
+  projectCoverFields,
+  type ProjectCoverField,
+} from "../../shared/constants/project-cover.js";
 import { projectCommandService } from "../composition/project-command-stores.js";
 import { projectRepository } from "../composition/application-repositories.js";
 import { respondWithProjectCommandError } from "./project-command.controller.js";
@@ -46,12 +50,27 @@ export async function updateProjectSettings(req: Request, res: Response) {
   }
 
   const { expectedRevision, ...settings } = parsed.data;
+  const current = await projectRepository.findById(projectId);
+  if (!current) {
+    return res.status(404).json({ error: "Project not found" });
+  }
+  // Cover fields are optional in the request and keep their current value
+  // when omitted. `expectedRevision` rejects a project changed meanwhile.
+  const coverValues = Object.fromEntries(
+    projectCoverFields.map((field) => [
+      field,
+      settings[field] === undefined ? current[field] : settings[field],
+    ])
+  ) as Record<ProjectCoverField, string | null>;
   try {
     const result = projectCommandService.executeUser({
       projectId,
       expectedRevision,
       description: "Projekteinstellungen bearbeiten",
-      command: createProjectSettingsUpdateProjectCommand(settings),
+      command: createProjectSettingsUpdateProjectCommand({
+        ...settings,
+        ...coverValues,
+      }),
     });
     const project = await projectRepository.findById(projectId);
     if (!project) {

src/server/index.ts

@@ -1,6 +1,7 @@
 import express from "express";
 import { globalDeviceRouter } from "./routes/global-device.routes.js";
 import { projectDeviceRouter } from "./routes/project-device.routes.js";
+import { documentBrandingRouter } from "./routes/document-branding.routes.js";
 import { projectRouter } from "./routes/project.routes.js";
 import { errorMiddleware } from "./middleware/error.middleware.js";
 import { createLogger, toErrorMeta } from "../shared/logging/logger.js";
@@ -51,6 +52,7 @@ app.get("/health", (_req, res) => {
 app.use("/api/projects", projectRouter);
 app.use("/api/global-devices", globalDeviceRouter);
 app.use("/api/project-devices", projectDeviceRouter);
+app.use("/api/document-branding", documentBrandingRouter);
 
 app.use(errorMiddleware);
 

src/server/routes/document-branding.routes.ts

@@ -0,0 +1,10 @@
+import express from "express";
+import * as documentBrandingController from "../controllers/document-branding.controller.js";
+
+export const documentBrandingRouter = express.Router();
+
+documentBrandingRouter.get("/", documentBrandingController.getDocumentBrandingHandler);
+documentBrandingRouter.put("/office", documentBrandingController.updateOfficeProfileHandler);
+documentBrandingRouter.get("/logo", documentBrandingController.getDocumentLogoHandler);
+documentBrandingRouter.put("/logo", documentBrandingController.uploadDocumentLogoHandler);
+documentBrandingRouter.delete("/logo", documentBrandingController.deleteDocumentLogoHandler);

src/server/routes/project.routes.ts

@@ -13,6 +13,12 @@ import {
   updateDistributionBoard,
 } from "../controllers/distribution-board.controller.js";
 import { listCircuitListsByProject } from "../controllers/circuit-list.controller.js";
+import {
+  createBuilding,
+  deleteBuilding,
+  listBuildingsByProject,
+  updateBuilding,
+} from "../controllers/building.controller.js";
 import { createFloor, deleteFloor, listFloorsByProject, updateFloor } from "../controllers/floor.controller.js";
 import { createRoom, deleteRoom, listRoomsByProject, updateRoom } from "../controllers/room.controller.js";
 import { getCircuitTree } from "../controllers/circuit-tree.controller.js";
@@ -100,6 +106,10 @@ projectRouter.get(
   "/:projectId/circuit-sections/:sectionId/next-identifier",
   getNextCircuitIdentifier
 );
+projectRouter.get("/:projectId/buildings", listBuildingsByProject);
+projectRouter.post("/:projectId/buildings", createBuilding);
+projectRouter.put("/:projectId/buildings/:buildingId", updateBuilding);
+projectRouter.delete("/:projectId/buildings/:buildingId", deleteBuilding);
 projectRouter.get("/:projectId/floors", listFloorsByProject);
 projectRouter.post("/:projectId/floors", createFloor);
 projectRouter.put("/:projectId/floors/:floorId", updateFloor);

src/shared/constants/distribution-board.ts

@@ -24,3 +24,44 @@ export const distributionBoardSupplyTypeLabels: Record<
   MSR: "MSR – Mess-, Steuerungs- und Regelungstechnik",
   SiBe: "SiBe – Sicherheitsbeleuchtung",
 };
+
+/**
+ * Planner-owned descriptive distribution-board data shown on the board info
+ * card and in the print view. The values are local planning values. A later
+ * Revit/CSV round-trip may prefill them from mapped model parameters, but only
+ * through a previewed, explicitly confirmed project command (see
+ * docs/spec/revit-csv-integration-requirements.md); imports never overwrite
+ * them silently.
+ *
+ * `fedFrom` is intentionally free text for now. How a board is logically
+ * linked to its upstream board or feeding circuit is not decided yet.
+ */
+export const distributionBoardInfoFields = [
+  "boardNumber",
+  "location",
+  "fedFrom",
+  "remark",
+] as const;
+
+export type DistributionBoardInfoField =
+  (typeof distributionBoardInfoFields)[number];
+
+export const distributionBoardInfoFieldLabels: Record<
+  DistributionBoardInfoField,
+  string
+> = {
+  boardNumber: "Verteilernummer",
+  location: "Örtlichkeit",
+  fedFrom: "Gespeist von",
+  remark: "Bemerkung",
+};
+
+export const distributionBoardInfoFieldMaxLengths: Record<
+  DistributionBoardInfoField,
+  number
+> = {
+  boardNumber: 50,
+  location: 200,
+  fedFrom: 200,
+  remark: 2000,
+};

src/shared/constants/document-branding.ts

@@ -0,0 +1,9 @@
+export const documentLogoMimeTypes = [
+  "image/png",
+  "image/jpeg",
+  "image/svg+xml",
+] as const;
+
+export type DocumentLogoMimeType = (typeof documentLogoMimeTypes)[number];
+
+export const maxDocumentLogoBytes = 2 * 1024 * 1024;

src/shared/constants/project-cover.ts

@@ -0,0 +1,45 @@
+/**
+ * Project data shown on the print view cover page. They are ordinary project
+ * settings (persisted through `project.update-settings`, part of logical
+ * snapshots and project transfer).
+ */
+export const projectCoverFields = [
+  "siteAddress",
+  "workStage",
+  "projectLead",
+  "projectEditor",
+] as const;
+
+export type ProjectCoverField = (typeof projectCoverFields)[number];
+
+export const projectCoverFieldLabels: Record<ProjectCoverField, string> = {
+  siteAddress: "Anschrift Bauvorhaben",
+  workStage: "Leistungsphase",
+  projectLead: "Projektleitung",
+  projectEditor: "Bearbeitung",
+};
+
+export const projectCoverFieldMaxLengths: Record<ProjectCoverField, number> = {
+  siteAddress: 500,
+  workStage: 100,
+  projectLead: 200,
+  projectEditor: 200,
+};
+
+/**
+ * Office-wide data for the cover page ("Planverfasser"). Global branding like
+ * the document logo, outside project revisions and snapshots.
+ */
+export const officeProfileFields = ["officeName", "officeAddress"] as const;
+
+export type OfficeProfileField = (typeof officeProfileFields)[number];
+
+export const officeProfileFieldLabels: Record<OfficeProfileField, string> = {
+  officeName: "Büro",
+  officeAddress: "Anschrift Büro",
+};
+
+export const officeProfileFieldMaxLengths: Record<OfficeProfileField, number> = {
+  officeName: 200,
+  officeAddress: 500,
+};

src/shared/validation/document-branding.schemas.ts

@@ -0,0 +1,42 @@
+import { z } from "zod";
+import {
+  documentLogoMimeTypes,
+  maxDocumentLogoBytes,
+} from "../constants/document-branding.js";
+import { officeProfileFieldMaxLengths } from "../constants/project-cover.js";
+
+export {
+  documentLogoMimeTypes,
+  maxDocumentLogoBytes,
+  type DocumentLogoMimeType,
+} from "../constants/document-branding.js";
+
+export const uploadDocumentLogoSchema = z
+  .object({
+    fileName: z.string().trim().min(1).max(200),
+    mimeType: z.enum(documentLogoMimeTypes),
+    contentBase64: z
+      .string()
+      .min(1)
+      // Base64 expands by 4/3; the decoded size is checked again server-side.
+      .max(Math.ceil((maxDocumentLogoBytes * 4) / 3) + 4),
+  })
+  .strict();
+
+export type UploadDocumentLogoInput = z.infer<typeof uploadDocumentLogoSchema>;
+
+// Empty text is stored as "not set" (null).
+const officeValueSchema = (maximumLength: number) =>
+  z
+    .string()
+    .trim()
+    .max(maximumLength)
+    .nullable()
+    .transform((value) => (value ? value : null));
+
+export const updateOfficeProfileSchema = z
+  .object({
+    officeName: officeValueSchema(officeProfileFieldMaxLengths.officeName),
+    officeAddress: officeValueSchema(officeProfileFieldMaxLengths.officeAddress),
+  })
+  .strict();

src/shared/validation/project-structure.schemas.ts

@@ -1,7 +1,25 @@
 import { z } from "zod";
-import { distributionBoardSupplyTypes } from "../constants/distribution-board.js";
+import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
+} from "../constants/distribution-board.js";
+import {
+  projectCoverFieldMaxLengths,
+  type ProjectCoverField,
+} from "../constants/project-cover.js";
 import { expectedProjectRevisionSchema } from "./project-command.schemas.js";
 
+// Empty text is stored as null so "not entered" has one representation.
+const optionalCoverValueSchema = (field: ProjectCoverField) =>
+  z
+    .string()
+    .trim()
+    .max(projectCoverFieldMaxLengths[field])
+    .nullable()
+    .transform((value) => (value ? value : null))
+    .optional();
+
 export const createProjectSchema = z.object({
   name: z.string().trim().min(1).max(200),
   internalProjectNumber: z.string().trim().max(100).optional(),
@@ -30,6 +48,11 @@ export const updateProjectSettingsSchema = z
       .refine((values) => new Set(values).size === values.length, {
         message: "Netzarten dürfen nicht mehrfach ausgewählt werden.",
       }),
+    // Print cover fields; omitted fields keep their current value.
+    siteAddress: optionalCoverValueSchema("siteAddress"),
+    workStage: optionalCoverValueSchema("workStage"),
+    projectLead: optionalCoverValueSchema("projectLead"),
+    projectEditor: optionalCoverValueSchema("projectEditor"),
   })
   .strict();
 
@@ -42,12 +65,27 @@ export const createDistributionBoardSchema = z
   })
   .strict();
 
+// Empty info text is stored as null so that "not entered" has one
+// representation in the database, snapshots and print view.
+const distributionBoardInfoValueSchema = (field: DistributionBoardInfoField) =>
+  z
+    .string()
+    .trim()
+    .max(distributionBoardInfoFieldMaxLengths[field])
+    .nullable()
+    .transform((value) => (value ? value : null))
+    .optional();
+
 export const updateDistributionBoardSchema = z
   .object({
     expectedRevision: expectedProjectRevisionSchema,
     floorId: z.string().trim().min(1).nullable(),
     supplyType: z.enum(distributionBoardSupplyTypes),
     simultaneityFactor: z.number().finite().min(0).max(1),
+    boardNumber: distributionBoardInfoValueSchema("boardNumber"),
+    location: distributionBoardInfoValueSchema("location"),
+    fedFrom: distributionBoardInfoValueSchema("fedFrom"),
+    remark: distributionBoardInfoValueSchema("remark"),
   })
   .strict();
 
@@ -64,10 +102,22 @@ export const deleteDistributionBoardSchema = z
   })
   .strict();
 
+export const createBuildingSchema = z
+  .object({
+    expectedRevision: expectedProjectRevisionSchema,
+    name: z.string().trim().min(1).max(200),
+  })
+  .strict();
+
+export const updateBuildingSchema = createBuildingSchema;
+
+// A missing buildingId keeps the current value (older clients send only the
+// name); null removes the floor from its building.
 export const createFloorSchema = z
   .object({
     expectedRevision: expectedProjectRevisionSchema,
     name: z.string().trim().min(1).max(200),
+    buildingId: z.string().trim().min(1).nullable().optional(),
   })
   .strict();
 

tests/building-structure-frontend-api.test.ts

@@ -0,0 +1,100 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  createBuilding,
+  createFloor,
+  deleteBuilding,
+  listBuildings,
+  updateBuilding,
+  updateFloor,
+} from "../src/frontend/utils/api.js";
+
+describe("building structure frontend API", () => {
+  it("sends building commands and optional floor building assignments", async () => {
+    const requests: Array<{ url: string; method: string; body: unknown }> = [];
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = async (input, init) => {
+      requests.push({
+        url: String(input),
+        method: init?.method ?? "GET",
+        body: init?.body === undefined ? undefined : JSON.parse(String(init.body)),
+      });
+      return new Response(JSON.stringify([]), {
+        status: 200,
+        headers: { "Content-Type": "application/json" },
+      });
+    };
+    try {
+      await listBuildings("project-1");
+      await createBuilding("project-1", { name: "Haus A" }, 3);
+      await updateBuilding("project-1", "building-1", { name: "Haus B" }, 4);
+      await deleteBuilding("project-1", "building-1", 5);
+      await createFloor(
+        "project-1",
+        { name: "EG", buildingId: "building-1" },
+        6
+      );
+      await createFloor("project-1", { name: "Dach", buildingId: null }, 7);
+      await createFloor("project-1", { name: "UG", buildingId: undefined }, 8);
+      await updateFloor(
+        "project-1",
+        "floor-1",
+        { name: "1. OG", buildingId: null },
+        9
+      );
+      await updateFloor("project-1", "floor-1", { name: "2. OG" }, 10);
+    } finally {
+      globalThis.fetch = originalFetch;
+    }
+
+    assert.deepEqual(requests, [
+      {
+        url: "/api/projects/project-1/buildings",
+        method: "GET",
+        body: undefined,
+      },
+      {
+        url: "/api/projects/project-1/buildings",
+        method: "POST",
+        body: { name: "Haus A", expectedRevision: 3 },
+      },
+      {
+        url: "/api/projects/project-1/buildings/building-1",
+        method: "PUT",
+        body: { name: "Haus B", expectedRevision: 4 },
+      },
+      {
+        url: "/api/projects/project-1/buildings/building-1",
+        method: "DELETE",
+        body: { expectedRevision: 5 },
+      },
+      {
+        url: "/api/projects/project-1/floors",
+        method: "POST",
+        body: { name: "EG", buildingId: "building-1", expectedRevision: 6 },
+      },
+      {
+        url: "/api/projects/project-1/floors",
+        method: "POST",
+        body: { name: "Dach", buildingId: null, expectedRevision: 7 },
+      },
+      {
+        url: "/api/projects/project-1/floors",
+        method: "POST",
+        body: { name: "UG", expectedRevision: 8 },
+      },
+      {
+        url: "/api/projects/project-1/floors/floor-1",
+        method: "PUT",
+        body: { name: "1. OG", buildingId: null, expectedRevision: 9 },
+      },
+      {
+        url: "/api/projects/project-1/floors/floor-1",
+        method: "PUT",
+        body: { name: "2. OG", expectedRevision: 10 },
+      },
+    ]);
+    const updateWithoutBuilding = requests[8].body as Record<string, unknown>;
+    assert.equal("buildingId" in updateWithoutBuilding, false);
+  });
+});

tests/building-structure-view.test.ts

@@ -0,0 +1,284 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import type {
+  BuildingDto,
+  FloorDto,
+  RoomDto,
+} from "../src/frontend/types.js";
+import {
+  ALL_SELECTION,
+  UNASSIGNED_SELECTION,
+  countFloorsByBuilding,
+  countRoomsByFloor,
+  defaultBuildingIdForNewFloor,
+  defaultFloorIdForNewRoom,
+  describeRoomLocation,
+  filterFloorsByBuilding,
+  filterRooms,
+  groupFloorsByBuilding,
+  hasFloorsWithoutBuilding,
+  hasRoomsWithoutFloor,
+  normalizeBuildingSelection,
+  normalizeFloorSelection,
+  showsRoomsWithoutFloorEntry,
+} from "../src/frontend/utils/building-structure.js";
+
+function building(id: string, name: string, sortOrder: number): BuildingDto {
+  return { id, projectId: "project-1", name, sortOrder };
+}
+
+function floor(
+  id: string,
+  name: string,
+  buildingId: string | null,
+  sortOrder = 0
+): FloorDto {
+  return { id, projectId: "project-1", name, sortOrder, buildingId };
+}
+
+function room(id: string, floorId: string | null, roomNumber = id): RoomDto {
+  return {
+    id,
+    projectId: "project-1",
+    floorId,
+    roomNumber,
+    roomName: `Raum ${roomNumber}`,
+  };
+}
+
+const buildings = [building("b-a", "Haus A", 0), building("b-b", "Haus B", 1)];
+const floors = [
+  floor("f-free", "Außenanlage", null, 0),
+  floor("f-a-eg", "EG", "b-a", 1),
+  floor("f-b-eg", "EG", "b-b", 2),
+  floor("f-a-og", "1. OG", "b-a", 3),
+  floor("f-orphan", "Keller", "b-deleted", 4),
+];
+const rooms = [
+  room("r-a-eg", "f-a-eg"),
+  room("r-a-og", "f-a-og"),
+  room("r-b-eg", "f-b-eg"),
+  room("r-free", "f-free"),
+  room("r-orphan-floor", "f-orphan"),
+  room("r-none", null),
+  room("r-missing-floor", "f-deleted"),
+];
+
+const ids = (entries: ReadonlyArray<{ id: string }>) =>
+  entries.map((entry) => entry.id);
+
+describe("building structure view", () => {
+  it("groups floors in building order and puts unassigned floors last", () => {
+    const groups = groupFloorsByBuilding(floors, buildings);
+    assert.deepEqual(
+      groups.map((group) => ({
+        buildingId: group.buildingId,
+        label: group.label,
+        floors: ids(group.floors),
+      })),
+      [
+        { buildingId: "b-a", label: "Haus A", floors: ["f-a-eg", "f-a-og"] },
+        { buildingId: "b-b", label: "Haus B", floors: ["f-b-eg"] },
+        {
+          buildingId: null,
+          label: "Ohne Gebäude",
+          floors: ["f-free", "f-orphan"],
+        },
+      ]
+    );
+  });
+
+  it("omits empty groups", () => {
+    const groups = groupFloorsByBuilding(
+      [floor("f-1", "EG", "b-b")],
+      buildings
+    );
+    assert.deepEqual(
+      groups.map((group) => group.buildingId),
+      ["b-b"]
+    );
+    assert.deepEqual(groupFloorsByBuilding([], buildings), []);
+  });
+
+  it("filters floors by building selection", () => {
+    assert.deepEqual(
+      ids(filterFloorsByBuilding(floors, buildings, ALL_SELECTION)),
+      ids(floors)
+    );
+    assert.deepEqual(
+      ids(filterFloorsByBuilding(floors, buildings, "b-a")),
+      ["f-a-eg", "f-a-og"]
+    );
+    assert.deepEqual(
+      ids(filterFloorsByBuilding(floors, buildings, UNASSIGNED_SELECTION)),
+      ["f-free", "f-orphan"]
+    );
+  });
+
+  it("detects floors without building and rooms without floor", () => {
+    assert.equal(hasFloorsWithoutBuilding(floors, buildings), true);
+    assert.equal(
+      hasFloorsWithoutBuilding([floor("f-1", "EG", "b-a")], buildings),
+      false
+    );
+    assert.equal(hasRoomsWithoutFloor(rooms, floors), true);
+    assert.equal(hasRoomsWithoutFloor([room("r-1", "f-a-eg")], floors), false);
+  });
+
+  it("filters rooms for building and floor selections", () => {
+    assert.deepEqual(
+      ids(filterRooms(rooms, floors, buildings, ALL_SELECTION, ALL_SELECTION)),
+      ids(rooms)
+    );
+    assert.deepEqual(
+      ids(filterRooms(rooms, floors, buildings, "b-a", ALL_SELECTION)),
+      ["r-a-eg", "r-a-og"]
+    );
+    assert.deepEqual(
+      ids(filterRooms(rooms, floors, buildings, "b-a", "f-a-og")),
+      ["r-a-og"]
+    );
+    assert.deepEqual(
+      ids(filterRooms(rooms, floors, buildings, ALL_SELECTION, "f-b-eg")),
+      ["r-b-eg"]
+    );
+    assert.deepEqual(
+      ids(
+        filterRooms(
+          rooms,
+          floors,
+          buildings,
+          UNASSIGNED_SELECTION,
+          ALL_SELECTION
+        )
+      ),
+      ["r-free", "r-orphan-floor", "r-none", "r-missing-floor"]
+    );
+    assert.deepEqual(
+      ids(
+        filterRooms(
+          rooms,
+          floors,
+          buildings,
+          ALL_SELECTION,
+          UNASSIGNED_SELECTION
+        )
+      ),
+      ["r-none", "r-missing-floor"]
+    );
+    assert.deepEqual(
+      ids(filterRooms(rooms, floors, buildings, "b-a", UNASSIGNED_SELECTION)),
+      []
+    );
+  });
+
+  it("offers 'Ohne Etage' only where rooms without floor can belong", () => {
+    assert.equal(showsRoomsWithoutFloorEntry(rooms, floors, ALL_SELECTION), true);
+    assert.equal(
+      showsRoomsWithoutFloorEntry(rooms, floors, UNASSIGNED_SELECTION),
+      true
+    );
+    assert.equal(showsRoomsWithoutFloorEntry(rooms, floors, "b-a"), false);
+    assert.equal(
+      showsRoomsWithoutFloorEntry([room("r-1", "f-a-eg")], floors, ALL_SELECTION),
+      false
+    );
+  });
+
+  it("falls back to 'Alle' for vanished or hidden selections", () => {
+    assert.equal(normalizeBuildingSelection("b-a", floors, buildings), "b-a");
+    assert.equal(
+      normalizeBuildingSelection("b-deleted", floors, buildings),
+      ALL_SELECTION
+    );
+    assert.equal(
+      normalizeBuildingSelection(UNASSIGNED_SELECTION, floors, buildings),
+      UNASSIGNED_SELECTION
+    );
+    assert.equal(
+      normalizeBuildingSelection(
+        UNASSIGNED_SELECTION,
+        [floor("f-1", "EG", "b-a")],
+        buildings
+      ),
+      ALL_SELECTION
+    );
+
+    assert.equal(
+      normalizeFloorSelection("f-a-og", rooms, floors, buildings, "b-a"),
+      "f-a-og"
+    );
+    assert.equal(
+      normalizeFloorSelection("f-b-eg", rooms, floors, buildings, "b-a"),
+      ALL_SELECTION
+    );
+    assert.equal(
+      normalizeFloorSelection("f-deleted", rooms, floors, buildings, ALL_SELECTION),
+      ALL_SELECTION
+    );
+    assert.equal(
+      normalizeFloorSelection(
+        UNASSIGNED_SELECTION,
+        rooms,
+        floors,
+        buildings,
+        ALL_SELECTION
+      ),
+      UNASSIGNED_SELECTION
+    );
+    assert.equal(
+      normalizeFloorSelection(UNASSIGNED_SELECTION, rooms, floors, buildings, "b-a"),
+      ALL_SELECTION
+    );
+  });
+
+  it("preselects the selected building and floor for new entries", () => {
+    assert.equal(defaultBuildingIdForNewFloor("b-a"), "b-a");
+    assert.equal(defaultBuildingIdForNewFloor(ALL_SELECTION), "");
+    assert.equal(defaultBuildingIdForNewFloor(UNASSIGNED_SELECTION), "");
+    assert.equal(defaultFloorIdForNewRoom("f-a-eg"), "f-a-eg");
+    assert.equal(defaultFloorIdForNewRoom(ALL_SELECTION), "");
+    assert.equal(defaultFloorIdForNewRoom(UNASSIGNED_SELECTION), "");
+  });
+
+  it("counts floors per building and rooms per floor", () => {
+    assert.deepEqual(
+      [...countFloorsByBuilding(floors, buildings)],
+      [
+        [null, 2],
+        ["b-a", 2],
+        ["b-b", 1],
+      ]
+    );
+    assert.deepEqual(
+      [...countRoomsByFloor(rooms, floors)],
+      [
+        ["f-a-eg", 1],
+        ["f-a-og", 1],
+        ["f-b-eg", 1],
+        ["f-free", 1],
+        ["f-orphan", 1],
+        [null, 2],
+      ]
+    );
+  });
+
+  it("describes a room location with floor and building", () => {
+    assert.equal(
+      describeRoomLocation(room("r", "f-a-og"), floors, buildings),
+      "1. OG · Haus A"
+    );
+    assert.equal(
+      describeRoomLocation(room("r", "f-free"), floors, buildings),
+      "Außenanlage"
+    );
+    assert.equal(
+      describeRoomLocation(room("r", "f-orphan"), floors, buildings),
+      "Keller"
+    );
+    assert.equal(
+      describeRoomLocation(room("r", null), floors, buildings),
+      "Ohne Etage"
+    );
+  });
+});

tests/distribution-board-structure-project-command.repository.test.ts

@@ -387,6 +387,110 @@ describe("distribution-board structure project command", () => {
     }
   });
 
+  it("updates the info card fields with persisted undo", () => {
+    const context = createTestDatabase();
+    try {
+      const repository =
+        new DistributionBoardStructureProjectCommandRepository(
+          context.db
+        );
+      const structure = createDistributionBoardStructureSnapshot(
+        "project-1",
+        "UV-EG",
+        { floorId: null, supplyType: "AV" }
+      );
+      const insert = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createDistributionBoardInsertProjectCommand(structure),
+      });
+      const readInfo = () =>
+        context.db
+          .select({
+            boardNumber: distributionBoards.boardNumber,
+            location: distributionBoards.location,
+            fedFrom: distributionBoards.fedFrom,
+            remark: distributionBoards.remark,
+          })
+          .from(distributionBoards)
+          .get();
+      assert.deepEqual(readInfo(), {
+        boardNumber: null,
+        location: null,
+        fedFrom: null,
+        remark: null,
+      });
+
+      const forward = repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "user",
+        command: createDistributionBoardUpdateProjectCommand(
+          structure.distributionBoard.id,
+          {
+            boardNumber: "UV 0.1",
+            location: "Raum 003 Technik",
+            fedFrom: "HAK",
+          }
+        ),
+      });
+      assert.deepEqual(readInfo(), {
+        boardNumber: "UV 0.1",
+        location: "Raum 003 Technik",
+        fedFrom: "HAK",
+        remark: null,
+      });
+      assert.deepEqual(
+        forward.inverse.payload.changes.map((change) => change.field),
+        ["boardNumber", "location", "fedFrom"]
+      );
+
+      // A board with info values is no longer the unchanged empty setup.
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 2,
+            source: "user",
+            command: insert.inverse,
+          }),
+        /changed before deletion/
+      );
+
+      const undoStep = new ProjectHistoryRepository(
+        context.db
+      ).getNextCommand("project-1", "undo");
+      assert.ok(undoStep);
+      repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "undo",
+        historyTargetChangeSetId: undoStep.changeSetId,
+        command: forward.inverse,
+      });
+      assert.deepEqual(readInfo(), {
+        boardNumber: null,
+        location: null,
+        fedFrom: null,
+        remark: null,
+      });
+
+      for (const value of ["", " UV 1", "x".repeat(51)]) {
+        assert.throws(
+          () =>
+            createDistributionBoardUpdateProjectCommand(
+              structure.distributionBoard.id,
+              { boardNumber: value }
+            ),
+          /boardNumber/
+        );
+      }
+    } finally {
+      context.close();
+    }
+  });
+
   it("sends distribution-board writes to the revision-safe API", async () => {
     const requests: Array<{ url: string; method: string; body: unknown }> = [];
     const originalFetch = globalThis.fetch;

tests/distribution-board-subtree-project-command.repository.test.ts

@@ -192,6 +192,67 @@ describe("distribution-board subtree project command", () => {
     }
   });
 
+  it("copies board info values and accepts snapshots stored before they existed", () => {
+    const context = createTestDatabase();
+    try {
+      const board = createPopulatedBoard(context);
+      context.db
+        .update(distributionBoards)
+        .set({ boardNumber: "UV 1.1", location: "Technik" })
+        .where(eq(distributionBoards.id, board.id))
+        .run();
+      const repository =
+        new DistributionBoardSubtreeProjectCommandRepository(context.db);
+      const withInfo = repository.capture("project-1", board.id);
+      const clone = cloneDistributionBoardSubtree(withInfo, "UV 1 Kopie");
+      assert.equal(clone.distributionBoard.boardNumber, "UV 1.1");
+      assert.equal(clone.distributionBoard.location, "Technik");
+
+      context.db
+        .update(distributionBoards)
+        .set({ boardNumber: null, location: null })
+        .where(eq(distributionBoards.id, board.id))
+        .run();
+      const legacySnapshot = structuredClone(
+        repository.capture("project-1", board.id)
+      );
+      const legacyBoard = legacySnapshot.distributionBoard as Record<
+        string,
+        unknown
+      >;
+      delete legacyBoard.boardNumber;
+      delete legacyBoard.location;
+      delete legacyBoard.fedFrom;
+      delete legacyBoard.remark;
+
+      const deleted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        description: "Verteilung löschen",
+        command: createDistributionBoardDeleteSubtreeProjectCommand(
+          legacySnapshot
+        ),
+      });
+      assert.throws(
+        () => repository.capture("project-1", board.id),
+        /not found/
+      );
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "user",
+        command: deleted.inverse,
+      });
+      assert.equal(
+        repository.capture("project-1", board.id).distributionBoard.fedFrom,
+        null
+      );
+    } finally {
+      context.close();
+    }
+  });
+
   it("rejects changed deletion snapshots without partial writes", () => {
     const context = createTestDatabase();
     try {

tests/document-branding.repository.test.ts

@@ -0,0 +1,77 @@
+import path from "node:path";
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import { createDatabaseContext } from "../src/db/database-context.js";
+import { DocumentBrandingRepository } from "../src/db/repositories/document-branding.repository.js";
+import { officeProfileFields } from "../src/shared/constants/project-cover.js";
+import { updateOfficeProfileSchema } from "../src/shared/validation/document-branding.schemas.js";
+
+function createRepository() {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  return { context, repository: new DocumentBrandingRepository(context.db) };
+}
+
+describe("document branding repository", () => {
+  it("stores, replaces and removes the office profile", () => {
+    const { context, repository } = createRepository();
+    try {
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: null,
+        officeAddress: null,
+      });
+      repository.setSettings(
+        updateOfficeProfileSchema.parse({
+          officeName: " kbp köhler beraten + planen GmbH ",
+          officeAddress: "Straße 1\n12345 Ort",
+        })
+      );
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: "kbp köhler beraten + planen GmbH",
+        officeAddress: "Straße 1\n12345 Ort",
+      });
+      repository.setSettings(
+        updateOfficeProfileSchema.parse({ officeName: "Büro", officeAddress: "" })
+      );
+      assert.deepEqual(repository.getSettings(officeProfileFields), {
+        officeName: "Büro",
+        officeAddress: null,
+      });
+      assert.equal(
+        updateOfficeProfileSchema.safeParse({ officeName: "x".repeat(201), officeAddress: null })
+          .success,
+        false
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("replaces and deletes the logo", () => {
+    const { context, repository } = createRepository();
+    try {
+      repository.upsert({
+        key: "logo",
+        mimeType: "image/png",
+        fileName: "a.png",
+        data: Buffer.from([1, 2, 3]),
+      });
+      repository.upsert({
+        key: "logo",
+        mimeType: "image/svg+xml",
+        fileName: "b.svg",
+        data: Buffer.from("<svg/>"),
+      });
+      const logo = repository.get("logo");
+      assert.equal(logo?.mimeType, "image/svg+xml");
+      assert.equal(logo?.data.toString(), "<svg/>");
+      assert.equal(repository.delete("logo"), true);
+      assert.equal(repository.get("logo"), undefined);
+    } finally {
+      context.close();
+    }
+  });
+});

tests/print-document-model.test.ts

@@ -0,0 +1,207 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  assertPrintRevisionConsistency,
+  buildPreliminaryBoardHierarchy,
+  formatCircuitCable,
+  formatProtectionDevice,
+  summarizePrintBoard,
+} from "../src/frontend/print/print-document-model.js";
+import type {
+  CircuitTreeResponseDto,
+  DistributionBoardDto,
+} from "../src/frontend/types.js";
+
+function board(
+  id: string,
+  info: Partial<DistributionBoardDto> = {}
+): DistributionBoardDto {
+  return {
+    id,
+    projectId: "project-1",
+    name: id,
+    floorId: null,
+    supplyType: "AV",
+    simultaneityFactor: 1,
+    boardNumber: null,
+    location: null,
+    fedFrom: null,
+    remark: null,
+    ...info,
+  };
+}
+
+function tree(
+  rows: Array<{
+    quantity: number;
+    powerPerUnit: number;
+    simultaneityFactor: number;
+    cosPhi?: number;
+  }>,
+  boardSimultaneityFactor = 1
+): CircuitTreeResponseDto {
+  const deviceRows = rows.map((row, index) => ({
+    id: `row-${index}`,
+    sortOrder: index,
+    name: "Gerät",
+    displayName: "Gerät",
+    manualQuantity: row.quantity,
+    rowTotalPower: row.quantity * row.powerPerUnit * row.simultaneityFactor,
+    ...row,
+  }));
+  const total = deviceRows.reduce((sum, row) => sum + row.rowTotalPower, 0);
+  return {
+    circuitListId: "list",
+    currentRevision: 1,
+    singlePhaseVoltageV: 230,
+    threePhaseVoltageV: 400,
+    distributionBoardSimultaneityFactor: boardSimultaneityFactor,
+    distributionBoardTotalPower: total,
+    distributionBoardTotalPowerWithSimultaneityFactor:
+      total * boardSimultaneityFactor,
+    headerComponents: [],
+    footerComponents: [],
+    sections: [
+      {
+        id: "section",
+        key: "single_phase",
+        displayName: "1-phasig 1",
+        prefix: "-2F1.",
+        sortOrder: 1,
+        sectionTotalPower: total,
+        components: [],
+        circuits: [
+          {
+            id: "circuit",
+            circuitListId: "list",
+            sectionId: "section",
+            equipmentIdentifier: "-2F1.1",
+            sortOrder: 1,
+            isReserve: false,
+            circuitTotalPower: total,
+            deviceRows,
+          },
+        ],
+      },
+    ],
+  };
+}
+
+function summary(
+  id: string,
+  info: Partial<DistributionBoardDto>,
+  demandKw: number
+) {
+  return summarizePrintBoard({
+    board: board(id, info),
+    circuitListId: id,
+    floorName: null,
+    tree: tree([{ quantity: 1, powerPerUnit: demandKw, simultaneityFactor: 1 }]),
+  });
+}
+
+describe("print document model", () => {
+  it("rejects mixed project revisions instead of printing mislabeled data", () => {
+    const summaries = [summary("uv", {}, 1)];
+    assert.doesNotThrow(() => assertPrintRevisionConsistency(1, summaries, 1));
+    assert.throws(() => assertPrintRevisionConsistency(0, summaries, 0), /neu laden/);
+    assert.throws(() => assertPrintRevisionConsistency(1, summaries, 2), /neu laden/);
+    assert.throws(() => assertPrintRevisionConsistency(1, [], 2), /neu laden/);
+  });
+
+  it("prints both cable type and cross-section without hiding either value", () => {
+    const circuit = tree([]).sections[0].circuits[0];
+    assert.equal(formatCircuitCable({ ...circuit, cableType: "NYM-J", cableCrossSection: "3x2,5" }), "NYM-J · 3x2,5");
+    assert.equal(formatCircuitCable({ ...circuit, cableType: "NYM-J" }), "NYM-J");
+    assert.equal(formatCircuitCable({ ...circuit, cableCrossSection: "3x2,5" }), "3x2,5");
+    assert.equal(formatCircuitCable(circuit), null);
+  });
+
+  it("does not guess a parent when feed text matches more than one board", () => {
+    const summaries = [
+      summary("a", { boardNumber: "HV" }, 2),
+      summary("b", { name: "HV" }, 3),
+      summary("uv", { fedFrom: " hv " }, 1),
+    ];
+    for (const ordered of [summaries, [...summaries].reverse()]) {
+      const entries = buildPreliminaryBoardHierarchy(ordered);
+      assert.ok(entries.every((entry) => entry.parentBoardId === null));
+      assert.equal(entries.reduce((sum, entry) => sum + entry.cumulatedDemandPowerKw, 0), 6);
+    }
+  });
+
+  it("derives installed, device and demand power and the design current", () => {
+    const result = summarizePrintBoard({
+      board: board("uv"),
+      circuitListId: "uv",
+      floorName: "EG",
+      tree: tree(
+        [
+          { quantity: 4, powerPerUnit: 2, simultaneityFactor: 0.5, cosPhi: 0.8 },
+          { quantity: 1, powerPerUnit: 6, simultaneityFactor: 1 },
+        ],
+        0.5
+      ),
+    });
+    assert.equal(result.circuitCount, 1);
+    assert.equal(result.installedPowerKw, 14);
+    assert.equal(result.devicePowerKw, 10);
+    assert.equal(result.demandPowerKw, 5);
+    // S = (4 / 0.8 + 6 / 1) × 0.5 = 5.5 kVA → I = 5500 / (√3 · 400)
+    assert.ok(Math.abs(result.designCurrentA - 5500 / (Math.sqrt(3) * 400)) < 1e-9);
+  });
+
+  it("nests boards by matching free-text feed and sums downstream demand", () => {
+    const entries = buildPreliminaryBoardHierarchy([
+      summary("hv", { boardNumber: "HV 0.1", fedFrom: "HAK" }, 10),
+      summary("uv-a", { boardNumber: "UV 1.1", fedFrom: " hv 0.1 " }, 4),
+      summary("uv-b", { boardNumber: "UV 1.2", fedFrom: "UV 1.1" }, 2),
+      summary("uv-c", { name: "UV-C", fedFrom: "unbekannt" }, 1),
+    ]);
+    assert.deepEqual(
+      entries.map((entry) => [
+        entry.summary.board.id,
+        entry.depth,
+        entry.parentBoardId,
+        entry.cumulatedDemandPowerKw,
+      ]),
+      [
+        ["hv", 0, null, 16],
+        ["uv-a", 1, "hv", 6],
+        ["uv-b", 2, "uv-a", 2],
+        ["uv-c", 0, null, 1],
+      ]
+    );
+  });
+
+  it("keeps boards with cyclic feed texts at the top level", () => {
+    const entries = buildPreliminaryBoardHierarchy([
+      summary("a", { boardNumber: "A", fedFrom: "B" }, 1),
+      summary("b", { boardNumber: "B", fedFrom: "A" }, 1),
+    ]);
+    assert.equal(entries.length, 2);
+    assert.ok(entries.some((entry) => entry.parentBoardId === null));
+    assert.equal(
+      entries.reduce((sum, entry) => sum + (entry.depth === 0 ? entry.cumulatedDemandPowerKw : 0), 0),
+      2
+    );
+  });
+
+  it("formats protection devices for the plan table", () => {
+    assert.equal(
+      formatProtectionDevice({ type: "LS", ratedCurrentA: 16, tripCharacteristic: "B" }),
+      "LS B 16 A"
+    );
+    assert.equal(
+      formatProtectionDevice({
+        type: "FI_LS",
+        ratedCurrentA: 16,
+        tripCharacteristic: "B",
+        rcdType: "A",
+        ratedResidualCurrentMa: 30,
+      }),
+      "FI/LS B 16 A, 30 mA Typ A"
+    );
+    assert.equal(formatProtectionDevice(undefined), null);
+  });
+});

tests/print-view-migration.test.ts

@@ -0,0 +1,62 @@
+import assert from "node:assert/strict";
+import { copyFileSync, mkdirSync, mkdtempSync, readFileSync, rmdirSync, unlinkSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { it } from "node:test";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import { createDatabaseContext } from "../src/db/database-context.js";
+
+it("upgrades a populated pre-print database through the current schema without changing existing records", async () => {
+  const source = path.resolve("src/db/migrations");
+  const staging = mkdtempSync(path.join(tmpdir(), "leistungsbilanz-print-migration-"));
+  const journal = JSON.parse(readFileSync(path.join(source, "meta/_journal.json"), "utf8"));
+  journal.entries = journal.entries.filter((entry: { idx: number }) => entry.idx <= 6);
+  mkdirSync(path.join(staging, "meta"));
+  const files = [path.join(staging, "meta/_journal.json")];
+  writeFileSync(files[0], JSON.stringify(journal));
+  for (const entry of journal.entries) {
+    const file = path.join(staging, `${entry.tag}.sql`);
+    copyFileSync(path.join(source, `${entry.tag}.sql`), file);
+    files.push(file);
+  }
+  const context = createDatabaseContext(":memory:");
+  try {
+    migrate(context.db, { migrationsFolder: staging });
+    context.sqlite.exec(`
+      INSERT INTO projects (id, name, current_revision) VALUES ('p', 'Existing project', 17);
+      INSERT INTO distribution_boards (id, project_id, name, simultaneity_factor)
+        VALUES ('b', 'p', 'Existing board', 0.7);
+      INSERT INTO floors (id, project_id, name, sort_order)
+        VALUES ('f', 'p', 'Existing floor', 3);
+    `);
+    const oldProject = context.sqlite.prepare("SELECT * FROM projects").get() as Record<string, unknown>;
+    const oldBoard = context.sqlite.prepare("SELECT * FROM distribution_boards").get() as Record<string, unknown>;
+    const oldFloor = context.sqlite.prepare("SELECT * FROM floors").get() as Record<string, unknown>;
+    const backup = path.join(staging, "before-print.db");
+    files.push(backup);
+    await context.sqlite.backup(backup);
+
+    migrate(context.db, { migrationsFolder: source });
+    const project = context.sqlite.prepare("SELECT * FROM projects").get() as Record<string, unknown>;
+    const board = context.sqlite.prepare("SELECT * FROM distribution_boards").get() as Record<string, unknown>;
+    const floor = context.sqlite.prepare("SELECT * FROM floors").get() as Record<string, unknown>;
+    for (const [key, value] of Object.entries(oldProject)) assert.deepEqual(project[key], value);
+    for (const [key, value] of Object.entries(oldBoard)) assert.deepEqual(board[key], value);
+    for (const [key, value] of Object.entries(oldFloor)) assert.deepEqual(floor[key], value);
+    for (const field of ["site_address", "work_stage", "project_lead", "project_editor"]) assert.equal(project[field], null);
+    for (const field of ["board_number", "location", "fed_from", "remark"]) assert.equal(board[field], null);
+    assert.equal(floor.building_id, null);
+    assert.equal(context.sqlite.prepare("SELECT count(*) AS count FROM buildings").get()!.count, 0);
+    assert.equal(context.sqlite.prepare("SELECT count(*) AS count FROM document_branding_assets").get()!.count, 0);
+    assert.equal(context.sqlite.prepare("SELECT count(*) AS count FROM document_branding_settings").get()!.count, 0);
+    assert.deepEqual(context.sqlite.pragma("foreign_key_check"), []);
+    assert.equal(context.sqlite.pragma("integrity_check", { simple: true }), "ok");
+    migrate(context.db, { migrationsFolder: source });
+    assert.deepEqual(context.sqlite.prepare("SELECT * FROM projects").get(), project);
+  } finally {
+    context.close();
+    for (const file of files) unlinkSync(file);
+    rmdirSync(path.join(staging, "meta"));
+    rmdirSync(staging);
+  }
+});

tests/project-building-structure.test.ts

@@ -0,0 +1,305 @@
+import path from "node:path";
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { eq } from "drizzle-orm";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import {
+  createDatabaseContext,
+  type DatabaseContext,
+} from "../src/db/database-context.js";
+import { ProjectHistoryRepository } from "../src/db/repositories/project-history.repository.js";
+import { ProjectLocationStructureProjectCommandRepository } from "../src/db/repositories/project-location-structure-project-command.repository.js";
+import { buildings } from "../src/db/schema/buildings.js";
+import { floors } from "../src/db/schema/floors.js";
+import { projects } from "../src/db/schema/projects.js";
+import {
+  assertProjectFloorInsertProjectCommand,
+  createProjectBuildingDeleteProjectCommand,
+  createProjectBuildingInsertProjectCommand,
+  createProjectBuildingSnapshot,
+  createProjectBuildingUpdateProjectCommand,
+  createProjectFloorInsertProjectCommand,
+  createProjectFloorSnapshot,
+  createProjectFloorUpdateProjectCommand,
+  projectFloorCommandSchemaVersion,
+  type ProjectLocationStructureProjectCommand,
+} from "../src/domain/models/project-location-structure-project-command.model.js";
+import {
+  createBuildingSchema,
+  createFloorSchema,
+  updateFloorSchema,
+} from "../src/shared/validation/project-structure.schemas.js";
+
+function createTestDatabase(): DatabaseContext {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  context.db
+    .insert(projects)
+    .values([
+      { id: "project-1", name: "Test project" },
+      { id: "project-2", name: "Foreign project" },
+    ])
+    .run();
+  return context;
+}
+
+/** Executes a user command and returns a runner for its undo and redo. */
+function createRunner(context: DatabaseContext) {
+  const repository = new ProjectLocationStructureProjectCommandRepository(
+    context.db
+  );
+  const history = new ProjectHistoryRepository(context.db);
+  let revision = 0;
+  const run = (
+    command: ProjectLocationStructureProjectCommand,
+    source: "user" | "undo" | "redo" = "user"
+  ) => {
+    const step =
+      source === "user" ? null : history.getNextCommand("project-1", source);
+    if (source !== "user") {
+      assert.ok(step);
+    }
+    const result = repository.execute({
+      projectId: "project-1",
+      expectedRevision: revision,
+      source,
+      historyTargetChangeSetId: step?.changeSetId,
+      command,
+    });
+    revision += 1;
+    return result;
+  };
+  return { repository, run };
+}
+
+function getBuilding(context: DatabaseContext, id: string) {
+  return context.db.select().from(buildings).where(eq(buildings.id, id)).get();
+}
+
+function getFloor(context: DatabaseContext, id: string) {
+  return context.db.select().from(floors).where(eq(floors.id, id)).get();
+}
+
+describe("project building structure", () => {
+  it("creates, renames and deletes buildings with persisted undo and redo", () => {
+    const context = createTestDatabase();
+    try {
+      const { run } = createRunner(context);
+      const building = createProjectBuildingSnapshot("project-1", " Haus A ", 0);
+      assert.equal(building.name, "Haus A");
+
+      const insert = createProjectBuildingInsertProjectCommand(building);
+      const inserted = run(insert);
+      assert.deepEqual(getBuilding(context, building.id), building);
+
+      const renamed = { ...building, name: "Haus B" };
+      const update = createProjectBuildingUpdateProjectCommand(building, renamed);
+      const updated = run(update);
+      assert.equal(getBuilding(context, building.id)?.name, "Haus B");
+
+      run(updated.inverse, "undo");
+      assert.deepEqual(getBuilding(context, building.id), building);
+      run(inserted.inverse, "undo");
+      assert.equal(getBuilding(context, building.id), undefined);
+      run(insert, "redo");
+      run(update, "redo");
+      assert.deepEqual(getBuilding(context, building.id), renamed);
+
+      const deleted = run(createProjectBuildingDeleteProjectCommand(renamed));
+      assert.equal(getBuilding(context, building.id), undefined);
+      run(deleted.inverse, "undo");
+      assert.deepEqual(getBuilding(context, building.id), renamed);
+    } finally {
+      context.close();
+    }
+  });
+
+  it("assigns floors to buildings and blocks deleting a building in use", () => {
+    const context = createTestDatabase();
+    try {
+      const { run } = createRunner(context);
+      const houseA = createProjectBuildingSnapshot("project-1", "Haus A", 0);
+      const houseB = createProjectBuildingSnapshot("project-1", "Haus B", 1);
+      run(createProjectBuildingInsertProjectCommand(houseA));
+      run(createProjectBuildingInsertProjectCommand(houseB));
+
+      const floor = createProjectFloorSnapshot("project-1", "EG", 0, houseA.id);
+      const floorInsert = createProjectFloorInsertProjectCommand(floor);
+      assert.equal(floorInsert.schemaVersion, projectFloorCommandSchemaVersion);
+      run(floorInsert);
+      assert.deepEqual(getFloor(context, floor.id), floor);
+
+      const moved = { ...floor, buildingId: houseB.id };
+      const moveCommand = createProjectFloorUpdateProjectCommand(floor, moved);
+      const movedResult = run(moveCommand);
+      assert.equal(getFloor(context, floor.id)?.buildingId, houseB.id);
+
+      assert.throws(
+        () => run(createProjectBuildingDeleteProjectCommand(houseB)),
+        /solange Etagen zugeordnet/
+      );
+      assert.ok(getBuilding(context, houseB.id));
+
+      run(movedResult.inverse, "undo");
+      assert.equal(getFloor(context, floor.id)?.buildingId, houseA.id);
+      run(moveCommand, "redo");
+      assert.equal(getFloor(context, floor.id)?.buildingId, houseB.id);
+
+      const unassigned = { ...moved, buildingId: null };
+      run(createProjectFloorUpdateProjectCommand(moved, unassigned));
+      assert.equal(getFloor(context, floor.id)?.buildingId, null);
+      run(createProjectBuildingDeleteProjectCommand(houseB));
+      assert.equal(getBuilding(context, houseB.id), undefined);
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects floors that reference a missing or foreign building", () => {
+    const context = createTestDatabase();
+    try {
+      const { run } = createRunner(context);
+      context.db
+        .insert(buildings)
+        .values({ id: "foreign", projectId: "project-2", name: "Fremd", sortOrder: 0 })
+        .run();
+      assert.throws(
+        () =>
+          run(
+            createProjectFloorInsertProjectCommand(
+              createProjectFloorSnapshot("project-1", "EG", 0, "foreign")
+            )
+          ),
+        /foreign building/
+      );
+      assert.throws(
+        () =>
+          run(
+            createProjectFloorInsertProjectCommand(
+              createProjectFloorSnapshot("project-1", "EG", 0, "missing")
+            )
+          ),
+        /foreign building/
+      );
+      assert.equal(context.db.select().from(floors).all().length, 0);
+
+      const floor = createProjectFloorSnapshot("project-1", "EG", 0);
+      run(createProjectFloorInsertProjectCommand(floor));
+      assert.throws(
+        () =>
+          run(
+            createProjectFloorUpdateProjectCommand(floor, {
+              ...floor,
+              buildingId: "foreign",
+            })
+          ),
+        /foreign building/
+      );
+      assert.throws(
+        () => createProjectFloorUpdateProjectCommand(floor, { ...floor }),
+        /only the name or the building/
+      );
+      assert.throws(
+        () =>
+          createProjectFloorUpdateProjectCommand(floor, {
+            ...floor,
+            sortOrder: 5,
+            name: "Erdgeschoss",
+          }),
+        /only the name or the building/
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("executes version 1 floor commands recorded before buildings existed", () => {
+    const context = createTestDatabase();
+    try {
+      const { run } = createRunner(context);
+      const legacyFloor = {
+        id: "floor-legacy",
+        projectId: "project-1",
+        name: "EG",
+        sortOrder: 0,
+      };
+      const legacyInsert = {
+        schemaVersion: 1 as const,
+        type: "project-floor.insert" as const,
+        payload: { floor: legacyFloor },
+      };
+      assertProjectFloorInsertProjectCommand(legacyInsert);
+      const inserted = run(legacyInsert);
+      assert.deepEqual(getFloor(context, legacyFloor.id), {
+        ...legacyFloor,
+        buildingId: null,
+      });
+      // The inverse is always written in the current version.
+      assert.equal(inserted.inverse.schemaVersion, projectFloorCommandSchemaVersion);
+
+      const legacyUpdate = {
+        schemaVersion: 1 as const,
+        type: "project-floor.update" as const,
+        payload: {
+          expected: legacyFloor,
+          target: { ...legacyFloor, name: "Erdgeschoss" },
+        },
+      };
+      const updated = run(legacyUpdate);
+      assert.equal(getFloor(context, legacyFloor.id)?.name, "Erdgeschoss");
+      run(updated.inverse, "undo");
+      assert.equal(getFloor(context, legacyFloor.id)?.name, "EG");
+
+      // A version 1 snapshot must not carry buildingId, a version 2 one must.
+      assert.throws(() =>
+        assertProjectFloorInsertProjectCommand({
+          schemaVersion: 1,
+          type: "project-floor.insert",
+          payload: { floor: { ...legacyFloor, buildingId: null } },
+        })
+      );
+      assert.throws(() =>
+        assertProjectFloorInsertProjectCommand({
+          schemaVersion: 2,
+          type: "project-floor.insert",
+          payload: { floor: legacyFloor },
+        })
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("validates building and floor requests", () => {
+    assert.equal(
+      createBuildingSchema.safeParse({ expectedRevision: 0, name: "Haus A" }).success,
+      true
+    );
+    assert.equal(
+      createBuildingSchema.safeParse({ expectedRevision: 0, name: " " }).success,
+      false
+    );
+    assert.equal(
+      createBuildingSchema.safeParse({
+        expectedRevision: 0,
+        name: "Haus A",
+        sortOrder: 1,
+      }).success,
+      false
+    );
+    for (const buildingId of [undefined, null, "building-1"]) {
+      assert.equal(
+        createFloorSchema.safeParse({ expectedRevision: 0, name: "EG", buildingId })
+          .success,
+        true
+      );
+    }
+    assert.equal(
+      updateFloorSchema.safeParse({ expectedRevision: 0, name: "EG", buildingId: "" })
+        .success,
+      false
+    );
+  });
+});

tests/project-command.service.test.ts

@@ -41,6 +41,7 @@ import { projectChangeSets } from "../src/db/schema/project-change-sets.js";
 import { projectDevices } from "../src/db/schema/project-devices.js";
 import { projectRevisions } from "../src/db/schema/project-revisions.js";
 import { projects } from "../src/db/schema/projects.js";
+import { buildings } from "../src/db/schema/buildings.js";
 import { floors } from "../src/db/schema/floors.js";
 import { rooms } from "../src/db/schema/rooms.js";
 import { externalCsvConfigurations } from "../src/db/schema/external-csv-configurations.js";
@@ -78,6 +79,8 @@ import {
   createDistributionBoardComponentUpdateProjectCommand,
 } from "../src/domain/models/distribution-board-component-structure-project-command.model.js";
 import {
+  createProjectBuildingInsertProjectCommand,
+  createProjectBuildingSnapshot,
   createProjectFloorInsertProjectCommand,
   createProjectFloorSnapshot,
   createProjectRoomInsertProjectCommand,
@@ -1074,6 +1077,10 @@ describe("project command service", () => {
             "MSR",
             "SiBe",
           ],
+          siteAddress: null,
+          workStage: null,
+          projectLead: null,
+          projectEditor: null,
         }),
       });
       assert.equal(updated.history.currentRevision, 1);
@@ -1606,6 +1613,43 @@ describe("project command service", () => {
     }
   });
 
+  it("dispatches building commands and floor assignments with persisted inverses", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const building = createProjectBuildingSnapshot("project-1", "Haus A", 0);
+      service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command: createProjectBuildingInsertProjectCommand(building),
+      });
+      const floor = createProjectFloorSnapshot("project-1", "EG", 0, building.id);
+      const created = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 1,
+        command: createProjectFloorInsertProjectCommand(floor),
+      });
+      assert.equal(created.history.currentRevision, 2);
+      assert.equal(
+        context.db.select().from(floors).where(eq(floors.id, floor.id)).get()
+          ?.buildingId,
+        building.id
+      );
+
+      createService(context).undo({ projectId: "project-1", expectedRevision: 2 });
+      createService(context).undo({ projectId: "project-1", expectedRevision: 3 });
+      assert.equal(context.db.select().from(buildings).all().length, 0);
+      createService(context).redo({ projectId: "project-1", expectedRevision: 4 });
+      createService(context).redo({ projectId: "project-1", expectedRevision: 5 });
+      assert.deepEqual(
+        context.db.select().from(floors).where(eq(floors.id, floor.id)).get(),
+        floor
+      );
+    } finally {
+      context.close();
+    }
+  });
+
   it("dispatches floor and room setup with their persisted inverses", () => {
     const context = createTestDatabase();
     try {

tests/project-settings-project-command.repository.test.ts

@@ -52,6 +52,10 @@ function getSettings(context: DatabaseContext) {
       threePhaseVoltageV: projects.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         projects.enabledDistributionBoardSupplyTypes,
+      siteAddress: projects.siteAddress,
+      workStage: projects.workStage,
+      projectLead: projects.projectLead,
+      projectEditor: projects.projectEditor,
       currentRevision: projects.currentRevision,
     })
     .from(projects)
@@ -81,6 +85,10 @@ function settings(
       "MSR",
       "SiBe",
     ],
+    siteAddress: null,
+    workStage: null,
+    projectLead: null,
+    projectEditor: null,
     ...overrides,
   };
 }
@@ -217,6 +225,10 @@ describe("project settings project-command repository", () => {
             "MSR",
             "SiBe",
           ],
+          siteAddress: null,
+          workStage: null,
+          projectLead: null,
+          projectEditor: null,
         },
       },
     ]);
@@ -289,6 +301,10 @@ describe("project settings project-command repository", () => {
           "MSR",
           "SiBe",
         ],
+        siteAddress: null,
+        workStage: null,
+        projectLead: null,
+        projectEditor: null,
       });
 
       const undoStep = history.getNextCommand("project-1", "undo");
@@ -317,6 +333,10 @@ describe("project settings project-command repository", () => {
           "MSR",
           "SiBe",
         ],
+        siteAddress: null,
+        workStage: null,
+        projectLead: null,
+        projectEditor: null,
         currentRevision: 2,
       });
       assert.deepEqual(getDerivedVoltages(context), {
@@ -356,6 +376,10 @@ describe("project settings project-command repository", () => {
           "MSR",
           "SiBe",
         ],
+        siteAddress: null,
+        workStage: null,
+        projectLead: null,
+        projectEditor: null,
         currentRevision: 3,
       });
       assert.deepEqual(getDerivedVoltages(context), {
@@ -433,6 +457,117 @@ describe("project settings project-command repository", () => {
     }
   });
 
+  it("persists the print cover fields with persisted undo", () => {
+    const context = createTestDatabase();
+    try {
+      const repository = new ProjectSettingsProjectCommandRepository(
+        context.db
+      );
+      const readCover = () =>
+        context.db
+          .select({
+            siteAddress: projects.siteAddress,
+            workStage: projects.workStage,
+            projectLead: projects.projectLead,
+            projectEditor: projects.projectEditor,
+          })
+          .from(projects)
+          .where(eq(projects.id, "project-1"))
+          .get();
+      const forward = repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createProjectSettingsUpdateProjectCommand(
+          settings({
+            siteAddress: "Musterstraße 1\n12345 Musterstadt",
+            workStage: "LPH 5",
+            projectLead: "P. Leitung",
+            projectEditor: "B. Arbeiter",
+          })
+        ),
+      });
+      assert.deepEqual(readCover(), {
+        siteAddress: "Musterstraße 1\n12345 Musterstadt",
+        workStage: "LPH 5",
+        projectLead: "P. Leitung",
+        projectEditor: "B. Arbeiter",
+      });
+      assert.equal(forward.inverse.schemaVersion, 3);
+
+      const undoStep = new ProjectHistoryRepository(
+        context.db
+      ).getNextCommand("project-1", "undo");
+      assert.ok(undoStep);
+      repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: undoStep.changeSetId,
+        command: forward.inverse,
+      });
+      assert.deepEqual(readCover(), {
+        siteAddress: null,
+        workStage: null,
+        projectLead: null,
+        projectEditor: null,
+      });
+
+      assert.throws(
+        () =>
+          createProjectSettingsUpdateProjectCommand(
+            settings({ workStage: " LPH 5" })
+          ),
+        /invalid values/
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("keeps the cover fields when applying a version 2 command", () => {
+    const context = createTestDatabase();
+    try {
+      context.db
+        .update(projects)
+        .set({ workStage: "LPH 3", projectLead: "P. Leitung" })
+        .where(eq(projects.id, "project-1"))
+        .run();
+      const repository = new ProjectSettingsProjectCommandRepository(
+        context.db
+      );
+      const {
+        siteAddress: _siteAddress,
+        workStage: _workStage,
+        projectLead: _projectLead,
+        projectEditor: _projectEditor,
+        ...versionTwoPayload
+      } = settings({ name: "Stand aus Version 2" });
+      const forward = repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: {
+          schemaVersion: 2,
+          type: "project.update-settings",
+          payload: versionTwoPayload,
+        },
+      });
+      const project = context.db
+        .select()
+        .from(projects)
+        .where(eq(projects.id, "project-1"))
+        .get();
+      assert.equal(project?.name, "Stand aus Version 2");
+      assert.equal(project?.workStage, "LPH 3");
+      assert.equal(project?.projectLead, "P. Leitung");
+      assert.equal(forward.inverse.schemaVersion, 2);
+      assert.equal(Object.keys(forward.inverse.payload).length, 9);
+    } finally {
+      context.close();
+    }
+  });
+
   it("persists the project supply-type selection and rejects disabling an in-use type", () => {
     const context = createTestDatabase();
     try {

tests/project-snapshot.repository.test.ts

@@ -20,6 +20,7 @@ import { circuits } from "../src/db/schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../src/db/schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
 import { distributionBoards } from "../src/db/schema/distribution-boards.js";
+import { buildings } from "../src/db/schema/buildings.js";
 import { floors } from "../src/db/schema/floors.js";
 import { projectDevices } from "../src/db/schema/project-devices.js";
 import { projectSnapshots } from "../src/db/schema/project-snapshots.js";
@@ -59,6 +60,15 @@ function createTestDatabase(): DatabaseContext {
     .where(eq(circuitSections.circuitListId, list.id))
     .get();
   assert.ok(section);
+  context.db
+    .insert(buildings)
+    .values({
+      id: "building-1",
+      projectId: "project-1",
+      name: "Haus A",
+      sortOrder: 0,
+    })
+    .run();
   context.db
     .insert(floors)
     .values({
@@ -66,6 +76,7 @@ function createTestDatabase(): DatabaseContext {
       projectId: "project-1",
       name: "EG",
       sortOrder: 10,
+      buildingId: "building-1",
     })
     .run();
   context.db
@@ -248,7 +259,9 @@ describe("project snapshot repository", () => {
         "device-1"
       );
       assert.equal(state.projectDevices.length, 1);
+      assert.equal(state.buildings.length, 1);
       assert.equal(state.floors.length, 1);
+      assert.equal(state.floors[0].buildingId, "building-1");
       assert.equal(state.rooms.length, 1);
       assert.deepEqual(repository.listByProject("project-1"), [
         created,
@@ -377,12 +390,84 @@ describe("project snapshot repository", () => {
       context.close();
     }
   });
+
+  it("restores snapshots stored with an older supported schema version", () => {
+    const context = createTestDatabase();
+    try {
+      const repository = new ProjectSnapshotRepository(context.db);
+      const snapshot = repository.createNamed({
+        projectId: "project-1",
+        expectedRevision: 0,
+        name: "Vor dem Update",
+      });
+      assert.ok(snapshot);
+      // Rewrite the stored payload into the previous (version 5) shape, as it
+      // exists for snapshots created before the current version.
+      const payload = JSON.parse(
+        context.db
+          .select({ payloadJson: projectSnapshots.payloadJson })
+          .from(projectSnapshots)
+          .where(eq(projectSnapshots.id, snapshot.id))
+          .get()!.payloadJson
+      ) as {
+        schemaVersion: number;
+        project: Record<string, unknown>;
+        distributionBoards: Array<Record<string, unknown>>;
+        buildings?: unknown;
+        floors: Array<Record<string, unknown>>;
+      };
+      payload.schemaVersion = 5;
+      delete payload.buildings;
+      for (const floor of payload.floors) {
+        delete floor.buildingId;
+      }
+      for (const field of ["siteAddress", "workStage", "projectLead", "projectEditor"]) {
+        delete payload.project[field];
+      }
+      for (const board of payload.distributionBoards) {
+        for (const field of ["boardNumber", "location", "fedFrom", "remark"]) {
+          delete board[field];
+        }
+      }
+      const payloadJson = JSON.stringify(payload);
+      context.db
+        .update(projectSnapshots)
+        .set({
+          schemaVersion: 5,
+          payloadJson,
+          payloadSha256: crypto
+            .createHash("sha256")
+            .update(payloadJson)
+            .digest("hex"),
+        })
+        .where(eq(projectSnapshots.id, snapshot.id))
+        .run();
+
+      const prepared = repository.prepareRestore("project-1", snapshot.id);
+      assert.ok(prepared);
+      const targetState = prepared.command.payload.targetState;
+      assert.equal(targetState.schemaVersion, projectStateSnapshotSchemaVersion);
+      assert.ok(targetState.distributionBoards.length > 0);
+      assert.ok(
+        targetState.distributionBoards.every(
+          (board) => board.boardNumber === null && board.fedFrom === null
+        )
+      );
+      // Version 5 predates buildings: the upgraded state has none.
+      assert.deepEqual(targetState.buildings, []);
+      assert.ok(targetState.floors.every((floor) => floor.buildingId === null));
+    } finally {
+      context.close();
+    }
+  });
 });
 
 describe("portable project transfer", () => {
   it("exports and atomically duplicates a complete project with new ids", () => {
     const context = createTestDatabase();
     try {
+      context.db.update(projects).set({ siteAddress: "Musterstraße 1", workStage: "LPH 5", projectLead: "Planung", projectEditor: "Test" }).where(eq(projects.id, "project-1")).run();
+      context.db.update(distributionBoards).set({ boardNumber: "UV-01", location: "Technik", fedFrom: "HAK", remark: "Prüfstand" }).where(eq(distributionBoards.projectId, "project-1")).run();
       const repository = new ProjectTransferRepository(context.db);
       const transfer = repository.exportProject("project-1");
       assert.ok(transfer);
@@ -398,6 +483,13 @@ describe("portable project transfer", () => {
       assert.ok(source);
       assert.ok(copied);
       assert.equal(copied.currentRevision, 0);
+      assert.equal(copied.state.project.siteAddress, source.state.project.siteAddress);
+      assert.equal(copied.state.project.workStage, "LPH 5");
+      assert.equal(copied.state.project.projectLead, "Planung");
+      assert.equal(copied.state.project.projectEditor, "Test");
+      for (const field of ["boardNumber", "location", "fedFrom", "remark"] as const) {
+        assert.equal(copied.state.distributionBoards[0][field], source.state.distributionBoards[0][field]);
+      }
       assert.equal(copied.state.circuits.length, source.state.circuits.length);
       assert.notEqual(
         copied.state.circuits[0].id,
@@ -436,6 +528,11 @@ describe("portable project transfer", () => {
         copied.state.distributionBoards[0].floorId,
         copied.state.floors[0].id
       );
+      assert.notEqual(copied.state.buildings[0].id, "building-1");
+      assert.equal(
+        copied.state.floors[0].buildingId,
+        copied.state.buildings[0].id
+      );
       assert.equal(
         copied.state.distributionBoards[0].supplyType,
         "SV"

tests/project-state-restore-command.repository.test.ts

@@ -39,6 +39,7 @@ import { circuitSections } from "../src/db/schema/circuit-sections.js";
 import { circuits } from "../src/db/schema/circuits.js";
 import { distributionBoardComponentProtectionDevices } from "../src/db/schema/distribution-board-component-protection-devices.js";
 import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
+import { distributionBoards } from "../src/db/schema/distribution-boards.js";
 import { floors } from "../src/db/schema/floors.js";
 import { projectDevices } from "../src/db/schema/project-devices.js";
 import { projectRevisions } from "../src/db/schema/project-revisions.js";
@@ -340,6 +341,8 @@ describe("project state restore command", () => {
   it("restores a complete snapshot as a revision and supports undo and redo", () => {
     const context = createTestDatabase();
     try {
+      context.db.update(projects).set({ siteAddress: "Originaladresse", workStage: "LPH 3", projectLead: "Leitung", projectEditor: "Bearbeitung" }).where(eq(projects.id, "project-1")).run();
+      context.db.update(distributionBoards).set({ boardNumber: "UV-01", location: "EG", fedFrom: "HAK", remark: "Original" }).where(eq(distributionBoards.projectId, "project-1")).run();
       const snapshots = new ProjectSnapshotRepository(context.db);
       const snapshot = snapshots.createNamed({
         projectId: "project-1",
@@ -351,6 +354,8 @@ describe("project state restore command", () => {
       assert.ok(original);
 
       changeCompleteProjectState(context);
+      context.db.update(projects).set({ siteAddress: "Neue Adresse", workStage: "LPH 5", projectLead: null, projectEditor: null }).where(eq(projects.id, "project-1")).run();
+      context.db.update(distributionBoards).set({ boardNumber: "UV-02", location: "OG", fedFrom: "HV", remark: null }).where(eq(distributionBoards.projectId, "project-1")).run();
       const changed = readProjectStateSnapshot(context.db, "project-1");
       assert.ok(changed);
       assert.notEqual(changed.payloadSha256, original.payloadSha256);

tests/project-state-snapshot.test.ts

@@ -8,6 +8,35 @@ import {
 } from "../src/domain/models/project-state-snapshot.model.js";
 import { createNamedProjectSnapshotSchema } from "../src/shared/validation/project-snapshot.schemas.js";
 
+/** Removes the fields introduced by snapshot schema version 7. */
+function withoutVersionSevenFields<
+  T extends { floors: object[] },
+>(snapshot: T): T {
+  delete (snapshot as Record<string, unknown>).buildings;
+  for (const floor of snapshot.floors) {
+    delete (floor as Record<string, unknown>).buildingId;
+  }
+  return snapshot;
+}
+
+/** Removes the fields introduced by snapshot schema versions 6 and 7. */
+function withoutVersionSixFields<
+  T extends { project: object; distributionBoards: object[]; floors: object[] },
+>(snapshot: T): T {
+  withoutVersionSevenFields(snapshot);
+  const project = snapshot.project as Record<string, unknown>;
+  for (const field of ["siteAddress", "workStage", "projectLead", "projectEditor"]) {
+    delete project[field];
+  }
+  for (const board of snapshot.distributionBoards) {
+    const record = board as Record<string, unknown>;
+    for (const field of ["boardNumber", "location", "fedFrom", "remark"]) {
+      delete record[field];
+    }
+  }
+  return snapshot;
+}
+
 function minimalSnapshot() {
   return {
     schemaVersion: projectStateSnapshotSchemaVersion,
@@ -29,6 +58,10 @@ function minimalSnapshot() {
         "MSR",
         "SiBe",
       ],
+      siteAddress: "Musterstraße 1\n12345 Musterstadt" as string | null,
+      workStage: "LPH 5" as string | null,
+      projectLead: "P. Leitung" as string | null,
+      projectEditor: null as string | null,
     },
     distributionBoards: [],
     externalCsvConfiguration: null,
@@ -45,7 +78,19 @@ function minimalSnapshot() {
     distributionBoardComponentProtectionDevices: [],
     circuits: [],
     projectDevices: [],
-    floors: [],
+    buildings: [] as Array<{
+      id: string;
+      projectId: string;
+      name: string;
+      sortOrder: number;
+    }>,
+    floors: [] as Array<{
+      id: string;
+      projectId: string;
+      name: string;
+      sortOrder: number;
+      buildingId: string | null;
+    }>,
     rooms: [],
   };
 }
@@ -61,6 +106,10 @@ function protectedSnapshot() {
         floorId: null,
         supplyType: null,
         simultaneityFactor: 1,
+        boardNumber: "UV 1.1" as string | null,
+        location: "Raum 003 Technik" as string | null,
+        fedFrom: "HV 0.1" as string | null,
+        remark: null as string | null,
       },
     ],
     circuitLists: [
@@ -151,7 +200,7 @@ describe("project state snapshot model", () => {
   });
 
   it("upgrades the supported baseline snapshot with a safe building default", () => {
-    const baseline = structuredClone(minimalSnapshot());
+    const baseline = withoutVersionSixFields(structuredClone(minimalSnapshot()));
     baseline.schemaVersion = 1 as typeof baseline.schemaVersion;
     delete (baseline.project as Record<string, unknown>).isPublicBuilding;
     delete (baseline as Record<string, unknown>).externalCsvConfiguration;
@@ -165,7 +214,7 @@ describe("project state snapshot model", () => {
   });
 
   it("upgrades snapshot version 2 with an empty external CSV configuration", () => {
-    const previous = structuredClone(minimalSnapshot());
+    const previous = withoutVersionSixFields(structuredClone(minimalSnapshot()));
     previous.schemaVersion = 2 as typeof previous.schemaVersion;
     delete (previous as Record<string, unknown>).externalCsvConfiguration;
     delete (previous as Record<string, unknown>).externalModel;
@@ -183,7 +232,7 @@ describe("project state snapshot model", () => {
   });
 
   it("upgrades snapshot version 3 with an empty external model", () => {
-    const previous = structuredClone(minimalSnapshot());
+    const previous = withoutVersionSixFields(structuredClone(minimalSnapshot()));
     previous.schemaVersion = 3 as typeof previous.schemaVersion;
     delete (previous as Record<string, unknown>).externalModel;
 
@@ -199,8 +248,52 @@ describe("project state snapshot model", () => {
     });
   });
 
+  it("upgrades snapshot version 5 with empty board info and cover fields", () => {
+    const previous = withoutVersionSixFields(protectedSnapshot());
+    previous.schemaVersion = 5 as typeof previous.schemaVersion;
+
+    const upgraded = parseProjectStateSnapshot(previous);
+
+    assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
+    assert.deepEqual(
+      {
+        siteAddress: upgraded.project.siteAddress,
+        workStage: upgraded.project.workStage,
+        projectLead: upgraded.project.projectLead,
+        projectEditor: upgraded.project.projectEditor,
+      },
+      { siteAddress: null, workStage: null, projectLead: null, projectEditor: null }
+    );
+    assert.deepEqual(
+      {
+        boardNumber: upgraded.distributionBoards[0]?.boardNumber,
+        location: upgraded.distributionBoards[0]?.location,
+        fedFrom: upgraded.distributionBoards[0]?.fedFrom,
+        remark: upgraded.distributionBoards[0]?.remark,
+      },
+      { boardNumber: null, location: null, fedFrom: null, remark: null }
+    );
+  });
+
+  it("keeps board info and cover values and rejects them in older versions", () => {
+    const parsed = parseProjectStateSnapshot(protectedSnapshot());
+    assert.equal(parsed.distributionBoards[0]?.boardNumber, "UV 1.1");
+    assert.equal(parsed.distributionBoards[0]?.location, "Raum 003 Technik");
+    assert.equal(parsed.distributionBoards[0]?.fedFrom, "HV 0.1");
+    assert.equal(parsed.project.siteAddress, "Musterstraße 1\n12345 Musterstadt");
+    assert.equal(parsed.project.workStage, "LPH 5");
+
+    const mislabeled = protectedSnapshot();
+    mislabeled.schemaVersion = 5 as typeof mislabeled.schemaVersion;
+    assert.throws(() => parseProjectStateSnapshot(mislabeled));
+
+    const missingCover = structuredClone(protectedSnapshot());
+    delete (missingCover.project as Record<string, unknown>).workStage;
+    assert.throws(() => parseProjectStateSnapshot(missingCover));
+  });
+
   it("upgrades snapshot version 4 with the existing quantity as manual share", () => {
-    const previous = protectedSnapshot();
+    const previous = withoutVersionSixFields(protectedSnapshot());
     previous.schemaVersion = 4 as typeof previous.schemaVersion;
     previous.circuits[0]!.isReserve = false;
     previous.circuits[0]!.deviceRows = [{
@@ -237,7 +330,10 @@ describe("project state snapshot model", () => {
     delete (outdated.project as Record<string, unknown>).description;
     assert.throws(() => parseProjectStateSnapshot(outdated));
     assert.throws(() =>
-      parseProjectStateSnapshot({ ...minimalSnapshot(), schemaVersion: 7 })
+      parseProjectStateSnapshot({
+        ...minimalSnapshot(),
+        schemaVersion: projectStateSnapshotSchemaVersion + 1,
+      })
     );
   });
 
@@ -286,12 +382,99 @@ describe("project state snapshot model", () => {
       projectId: "project-2",
       name: "EG",
       sortOrder: 10,
+      buildingId: null,
     });
     assert.throws(
       () => parseProjectStateSnapshot(wrongOwner),
       /floor belongs to a different project/
     );
   });
+
+  it("keeps buildings and validates floor building references", () => {
+    const snapshot = minimalSnapshot();
+    snapshot.buildings.push({
+      id: "building-1",
+      projectId: "project-1",
+      name: "Haus A",
+      sortOrder: 0,
+    });
+    snapshot.floors.push(
+      {
+        id: "floor-1",
+        projectId: "project-1",
+        name: "EG",
+        sortOrder: 0,
+        buildingId: "building-1",
+      },
+      {
+        id: "floor-2",
+        projectId: "project-1",
+        name: "Keller",
+        sortOrder: 1,
+        buildingId: null,
+      }
+    );
+    const parsed = deserializeProjectStateSnapshot(
+      serializeProjectStateSnapshot(parseProjectStateSnapshot(snapshot))
+    );
+    assert.deepEqual(parsed.buildings, snapshot.buildings);
+    assert.deepEqual(
+      parsed.floors.map((floor) => floor.buildingId),
+      ["building-1", null]
+    );
+
+    const unknownBuilding = structuredClone(snapshot);
+    unknownBuilding.floors[0]!.buildingId = "building-x";
+    assert.throws(
+      () => parseProjectStateSnapshot(unknownBuilding),
+      /floor building/
+    );
+
+    const foreignBuilding = structuredClone(snapshot);
+    foreignBuilding.buildings[0]!.projectId = "project-2";
+    assert.throws(
+      () => parseProjectStateSnapshot(foreignBuilding),
+      /building belongs to a different project/
+    );
+
+    const floorWithoutBuildingField = structuredClone(snapshot);
+    delete (floorWithoutBuildingField.floors[1] as Record<string, unknown>)
+      .buildingId;
+    assert.throws(() => parseProjectStateSnapshot(floorWithoutBuildingField));
+  });
+
+  it("upgrades snapshot version 6 without buildings", () => {
+    const snapshot = minimalSnapshot();
+    snapshot.floors.push({
+      id: "floor-1",
+      projectId: "project-1",
+      name: "EG",
+      sortOrder: 0,
+      buildingId: null,
+    });
+    const previous = withoutVersionSevenFields(structuredClone(snapshot));
+    previous.schemaVersion = 6 as typeof previous.schemaVersion;
+
+    const upgraded = parseProjectStateSnapshot(previous);
+
+    assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
+    assert.deepEqual(upgraded.buildings, []);
+    assert.deepEqual(upgraded.floors, [
+      {
+        id: "floor-1",
+        projectId: "project-1",
+        name: "EG",
+        sortOrder: 0,
+        buildingId: null,
+      },
+    ]);
+    // Version 6 cover values survive the upgrade.
+    assert.equal(upgraded.project.workStage, "LPH 5");
+
+    const mislabeled = structuredClone(snapshot);
+    mislabeled.schemaVersion = 6 as typeof mislabeled.schemaVersion;
+    assert.throws(() => parseProjectStateSnapshot(mislabeled));
+  });
 });
 
 describe("named project snapshot request", () => {