Add print view, board info card and document logo upload

- Seitenansicht (/projects/:projectId/print): tabular cover page, board
  overview with supply structure and power sums, one plan per board with a
  repeating title block; PDF via the browser print dialog with named @page
  rules (A4 portrait cover, A4/A3 landscape plans, page x of y).
- Distribution-board info card (board number, location, fed-from, remark)
  in the board edit dialog, persisted through the additively extended
  distribution-board.update command (migration 0008, snapshot schema 6,
  legacy subtree commands normalized).
- Global document logo upload (PNG/JPEG/SVG, max 2 MB) outside project
  revisions and snapshots.
- fed-from stays free text; the overview hierarchy and cumulated sums are
  preliminary until the feed link is modeled.

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

AGENTS.md

@@ -250,8 +250,12 @@ 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 6 additionally stores the distribution-board
-of every CircuitDeviceRow. Version 4 snapshots are upgraded with
+info fields `boardNumber`, `location`, `fedFrom` and `remark`; all older
+supported versions are upgraded with `null` for these fields. Stored named and
+automatic snapshots of every supported version (1 to 6) 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
@@ -265,7 +269,7 @@ 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 5/6, 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
@@ -279,7 +283,7 @@ 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
@@ -422,6 +426,18 @@ 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
@@ -443,6 +459,32 @@ 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 are the provisional kbp CD (`--pd-*` variables) until the
+  official CD specification exists. Cover fields shown as "[ergänzen]"
+  (address, Leistungsphase, office staff) have no data model yet.
+- The document logo is global office branding: table
+  `document_branding_assets` (migration `0007`), endpoints
+  `GET|PUT|DELETE /api/document-branding/logo` 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
 
 When explicitly working on Phase 14, use
@@ -538,6 +580,11 @@ Users must be able to override sizing suggestions.
 - 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
+- data model for the remaining print cover fields (address, Leistungsphase,
+  project lead/editor) and the official kbp CD values
 
 Do not implement these while working on an unrelated phase.
 

docs/README.md

@@ -12,6 +12,8 @@ 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
 - [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

docs/circuit-list-editor-api.md

@@ -230,9 +230,13 @@ 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
@@ -425,3 +429,23 @@ 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 }`
+- `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`

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

@@ -27,3 +27,11 @@
 - 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 cover page shows placeholders for address, Leistungsphase and
+  office staff, and uses a provisional kbp corporate design. On screen, long
+  board plans are not split into pages; pagination happens in the browser print
+  dialog.

docs/current-architecture.md

@@ -416,7 +416,13 @@ 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 6 enthält diese Felder; 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

docs/print-view.md

@@ -0,0 +1,80 @@
+# Seitenansicht und PDF-Export
+
+Stand: erste Ausbaustufe (Beispiel zur Abstimmung). Die Seitenansicht ist
+rein lesend und verändert keine Projektdaten.
+
+## 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.
+- **Logo hinterlegen / ersetzen / entfernen** verwaltet das Büro-Logo.
+
+## Seiten
+
+1. **Deckblatt (A4 hoch)** – tabellarisch: Projekt, Planverfasser, Dokument,
+   Planstände (aus benannten Sicherungspunkten) und Inhalt. Angaben ohne
+   Datenmodell erscheinen als orangefarbenes „[ergänzen]“ (Anschrift,
+   Leistungsphase, Projektleitung, Bearbeitung).
+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 genau der Nummer oder
+  Bezeichnung eines anderen Verteilers entspricht; „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. Der Büroname steht vorläufig als Konstante
+  `printOfficeName` in `src/frontend/print/print-document.tsx`.
+
+## 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

scripts/db-verify-circuit-schema.js

@@ -12,6 +12,7 @@ const requiredTables = [
   "circuit_protection_devices",
   "distribution_board_components",
   "distribution_board_component_protection_devices",
+  "document_branding_assets",
 ];
 
 const tablePlaceholders = requiredTables.map(() => "?").join(", ");
@@ -98,6 +99,10 @@ const requiredDistributionBoardColumns = [
   "floor_id",
   "supply_type",
   "simultaneity_factor",
+  "board_number",
+  "location",
+  "fed_from",
+  "remark",
 ];
 const distributionBoardColumns = new Set(
   db

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

@@ -54,6 +54,12 @@ 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 {
   ProjectSettingsModal,
   type ProjectSettingsInput,
@@ -101,6 +107,15 @@ export default function ProjectDetailPage() {
     setEditingBoardSimultaneityFactor,
   ] = useState("1");
   const [editingBoardCopyName, setEditingBoardCopyName] = useState("");
+  const [editingBoardInfo, setEditingBoardInfo] =
+    useState<DistributionBoardInfoDraft>(
+      toDistributionBoardInfoDraft({
+        boardNumber: null,
+        location: null,
+        fedFrom: null,
+        remark: null,
+      })
+    );
   const [floorName, setFloorName] = useState("");
   const [editingFloor, setEditingFloor] = useState<FloorDto | null>(null);
   const [editingRoom, setEditingRoom] = useState<RoomDto | null>(null);
@@ -424,6 +439,7 @@ export default function ProjectDetailPage() {
       String(board.simultaneityFactor)
     );
     setEditingBoardCopyName(`${board.name} Kopie`);
+    setEditingBoardInfo(toDistributionBoardInfoDraft(board));
   }
 
   function openBoardCreator() {
@@ -459,6 +475,7 @@ export default function ProjectDetailPage() {
           floorId: editingBoardFloorId || null,
           supplyType: editingBoardSupplyType,
           simultaneityFactor,
+          ...fromDistributionBoardInfoDraft(editingBoardInfo),
         },
         project.currentRevision
       );
@@ -849,6 +866,13 @@ export default function ProjectDetailPage() {
           </p>
         </div>
         <div className="d-flex gap-2">
+          <Link
+            className="btn btn-primary"
+            href={`/projects/${projectId}/print`}
+            target="_blank"
+          >
+            Seitenansicht
+          </Link>
           <button
             className="btn btn-outline-primary"
             disabled={!project}
@@ -922,7 +946,9 @@ 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>
@@ -934,7 +960,11 @@ 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"
@@ -985,7 +1015,7 @@ 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>
@@ -1464,6 +1494,12 @@ 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

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

@@ -0,0 +1,261 @@
+"use client";
+
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { ChangeEvent, useEffect, useMemo, useState } from "react";
+import "../../../../frontend/print/print-document.css";
+import {
+  deleteDocumentLogo,
+  documentLogoUrl,
+  getCircuitTree,
+  getDocumentBranding,
+  getProject,
+  listCircuitLists,
+  listDistributionBoards,
+  listFloors,
+  listProjectSnapshots,
+  uploadDocumentLogo,
+} from "../../../../frontend/utils/api";
+import type {
+  DocumentLogoMetadataDto,
+  ProjectDto,
+  ProjectSnapshotMetadataDto,
+} from "../../../../frontend/types";
+import { PrintDocument } from "../../../../frontend/print/print-document";
+import {
+  buildPreliminaryBoardHierarchy,
+  summarizePrintBoard,
+  type PrintBoardSummary,
+} from "../../../../frontend/print/print-document-model";
+import {
+  documentLogoMimeTypes,
+  maxDocumentLogoBytes,
+} from "../../../../shared/validation/document-branding.schemas";
+
+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 [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,
+            })
+          )
+      );
+      if (cancelled) {
+        return;
+      }
+      setData({
+        project,
+        summaries,
+        namedSnapshots: snapshots
+          .filter((snapshot) => snapshot.kind === "named")
+          .sort((left, right) => left.createdAtIso.localeCompare(right.createdAtIso)),
+      });
+      setLogo(branding.logo);
+      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 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 ? ` · ${data.project.name}` : ""}
+        </span>
+        {message ? <span className="pd-toolbar-message">{message}</span> : null}
+        {error ? <span className="pd-toolbar-error">{error}</span> : null}
+        <label className="d-flex align-items-center gap-2">
+          Planformat
+          <select
+            className="form-select form-select-sm w-auto"
+            onChange={(event) => setFormat(event.target.value as PlanFormat)}
+            value={format}
+          >
+            <option value="a4">A4 quer</option>
+            <option value="a3">A3 quer</option>
+          </select>
+        </label>
+        <label className={`btn btn-sm btn-outline-primary mb-0${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>
+      {data ? (
+        <PrintDocument
+          entries={entries}
+          logoSrc={logoSrc}
+          namedSnapshots={data.namedSnapshots}
+          printedAt={printedAt}
+          project={data.project}
+        />
+      ) : error ? null : (
+        <p className="p-4 text-secondary">Seitenansicht wird geladen …</p>
+      )}
+    </div>
+  );
+}

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/meta/_journal.json

@@ -50,6 +50,13 @@
       "when": 1786043080323,
       "tag": "0006_damp_skrulls",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "6",
+      "when": 1790411540872,
+      "tag": "0007_board_info_and_document_logo",
+      "breakpoints": true
     }
   ]
 }

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
   ) {
+    const snapshot = normalizeDistributionBoardSubtreeSnapshot(
+      command.payload.snapshot
+    );
     if (command.type === distributionBoardInsertSubtreeCommandType) {
-      this.insert(database, projectId, command.payload.snapshot);
+      this.insert(database, projectId, snapshot);
-      return createDistributionBoardDeleteSubtreeProjectCommand(
+      return createDistributionBoardDeleteSubtreeProjectCommand(snapshot);
-        command.payload.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 +1,52 @@
+import { eq } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import {
+  documentBrandingAssets,
+  type DocumentBrandingAsset,
+} from "../schema/document-branding-assets.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
+    );
+  }
+}

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/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/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-state-snapshot.model.ts

@@ -1,5 +1,9 @@
 import { z } from "zod";
-import { distributionBoardSupplyTypes } from "../../shared/constants/distribution-board.js";
+import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
+} from "../../shared/constants/distribution-board.js";
 import {
   circuitGroupCategories,
 } from "../../shared/constants/circuit-group.js";
@@ -27,7 +31,8 @@ import {
   type ExternalModelStateSnapshot,
 } from "../../external-model/domain/external-model-contracts.js";
 
-export const projectStateSnapshotSchemaVersion = 5 as const;
+export const projectStateSnapshotSchemaVersion = 6 as const;
+const boardInfoProjectStateSnapshotSchemaVersion = 5 as const;
 const previousProjectStateSnapshotSchemaVersion = 4 as const;
 const externalModelProjectStateSnapshotSchemaVersion = 3 as const;
 const legacyProjectStateSnapshotSchemaVersion = 2 as const;
@@ -62,7 +67,7 @@ const projectSchema = previousProjectSchema
   .extend({ isPublicBuilding: z.boolean() })
   .strict();
 
-const distributionBoardSchema = z
+const legacyDistributionBoardSchema = z
   .object({
     id: idSchema,
     projectId: idSchema,
@@ -73,6 +78,35 @@ 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,
@@ -457,11 +491,22 @@ export const projectStateSnapshotSchema = z
   })
   .strict();
 
+const boardInfoProjectStateSnapshotSchema = z
+  .object({
+    schemaVersion: z.literal(boardInfoProjectStateSnapshotSchemaVersion),
+    project: projectSchema,
+    distributionBoards: z.array(legacyDistributionBoardSchema),
+    externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
+    externalModel: externalModelStateSchema,
+    ...projectStateSnapshotContents,
+  })
+  .strict();
+
 const previousProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(previousProjectStateSnapshotSchemaVersion),
     project: projectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     externalModel: externalModelStateSchema,
     ...projectStateSnapshotContents,
@@ -472,7 +517,7 @@ const externalModelProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(externalModelProjectStateSnapshotSchemaVersion),
     project: projectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
     externalCsvConfiguration: externalCsvConfigurationSnapshotSchema.nullable(),
     ...projectStateSnapshotContents,
   })
@@ -482,7 +527,7 @@ const legacyProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(legacyProjectStateSnapshotSchemaVersion),
     project: projectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
     ...projectStateSnapshotContents,
   })
   .strict();
@@ -491,7 +536,7 @@ const baselineProjectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(baselineProjectStateSnapshotSchemaVersion),
     project: previousProjectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
+    distributionBoards: z.array(legacyDistributionBoardSchema),
     ...projectStateSnapshotContents,
   })
   .strict();
@@ -500,6 +545,20 @@ 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 {
@@ -521,11 +580,26 @@ 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; they are upgraded as empty (null) values.
+  if (schemaVersion === boardInfoProjectStateSnapshotSchemaVersion) {
+    const previous = boardInfoProjectStateSnapshotSchema.parse(value);
+    return {
+      ...previous,
+      schemaVersion: projectStateSnapshotSchemaVersion,
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
+    };
+  }
   if (schemaVersion === previousProjectStateSnapshotSchemaVersion) {
     const previous = previousProjectStateSnapshotSchema.parse(value);
     return {
       ...previous,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
     };
   }
   if (schemaVersion === externalModelProjectStateSnapshotSchemaVersion) {
@@ -533,6 +607,9 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...previous,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      distributionBoards: withEmptyDistributionBoardInfo(
+        previous.distributionBoards
+      ),
       externalModel: emptyExternalModelState(),
     };
   }
@@ -541,6 +618,9 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
     return {
       ...legacy,
       schemaVersion: projectStateSnapshotSchemaVersion,
+      distributionBoards: withEmptyDistributionBoardInfo(
+        legacy.distributionBoards
+      ),
       externalCsvConfiguration: null,
       externalModel: emptyExternalModelState(),
     };
@@ -551,6 +631,9 @@ function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
       ...baseline,
       schemaVersion: projectStateSnapshotSchemaVersion,
       project: { ...baseline.project, isPublicBuilding: false },
+      distributionBoards: withEmptyDistributionBoardInfo(
+        baseline.distributionBoards
+      ),
       externalCsvConfiguration: null,
       externalModel: emptyExternalModelState(),
     };

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/print/print-document-model.ts

@@ -0,0 +1,180 @@
+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;
+}
+
+/**
+ * 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 parent = fedFrom
+      ? summaries.find(
+          (candidate) =>
+            candidate !== summary &&
+            (normalize(candidate.board.boardNumber) === fedFrom ||
+              normalize(candidate.board.name) === fedFrom)
+        )
+      : 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 || null;
+}

src/frontend/print/print-document.css

@@ -0,0 +1,473 @@
+/* Print view (Seitenansicht) in the provisional kbp corporate design.
+   Colors are derived from the kbp logo and presentation material and will be
+   replaced by the official CD specification; 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-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;
+  }
+  .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 +1,612 @@
+"use client";
+
+import type { ReactNode } from "react";
+import type {
+  CircuitTreeCircuitDto,
+  CircuitTreeComponentDto,
+  CircuitTreeDeviceRowDto,
+  ProjectDto,
+  ProjectSnapshotMetadataDto,
+} from "../types";
+import {
+  formatCircuitCable,
+  formatCurrent,
+  formatFactor,
+  formatKilowatt,
+  formatProtectionDevice,
+  formatUnitPower,
+  type PrintBoardHierarchyEntry,
+} from "./print-document-model";
+
+// Provisional office data until the project/cover fields are added.
+export const printOfficeName = "kbp köhler beraten + planen GmbH";
+
+export interface PrintDocumentProps {
+  project: ProjectDto;
+  entries: PrintBoardHierarchyEntry[];
+  namedSnapshots: ProjectSnapshotMetadataDto[];
+  logoSrc: string | null;
+  printedAt: Date;
+}
+
+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,
+  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><Placeholder /></td></tr>
+          <tr><th>Bauherr</th><td>{project.buildingOwner ?? <Placeholder />}</td></tr>
+          <tr><th>Projektnummer intern</th><td>{project.internalProjectNumber ?? <Placeholder />}</td></tr>
+          <tr><th>Projektnummer extern</th><td>{project.externalProjectNumber ?? <Placeholder />}</td></tr>
+          <tr><th>Leistungsphase</th><td><Placeholder /></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>{printOfficeName}</td></tr>
+            <tr><th>Anschrift</th><td><Placeholder /></td></tr>
+            <tr><th>Projektleitung</th><td><Placeholder /></td></tr>
+            <tr><th>Bearbeitung</th><td><Placeholder /></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>
+                <td><Placeholder /></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 gleichlautende Verteilernummern bzw.
+            -bezeichnungen zugeordnet und einfach addiert (kein übergeordneter GZF). 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,
+  entries,
+  namedSnapshots,
+  logoSrc,
+  printedAt,
+}: PrintDocumentProps) {
+  const stand = dateFormat.format(printedAt);
+  return (
+    <div className="pd-pages">
+      <CoverSheet
+        entries={entries}
+        logoSrc={logoSrc}
+        namedSnapshots={namedSnapshots}
+        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

@@ -172,7 +172,14 @@ 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 +188,13 @@ export interface DistributionBoardDto {
   simultaneityFactor: number;
 }
 
+export interface DocumentLogoMetadataDto {
+  mimeType: string;
+  fileName: string | null;
+  sizeBytes: number;
+  updatedAtIso: string;
+}
+
 export interface DistributionBoardCommandResultDto
   extends ProjectCommandResultDto {
   distributionBoard: DistributionBoardDto;

src/frontend/utils/api.ts

@@ -8,6 +8,8 @@ import type {
   DistributionBoardCommandResultDto,
   DistributionBoardCopyCommandResultDto,
   DistributionBoardDeleteCommandResultDto,
+  DistributionBoardInfoDto,
+  DocumentLogoMetadataDto,
   FloorDto,
   GlobalDeviceDto,
   ProjectCommandDto,
@@ -329,7 +331,7 @@ export function updateDistributionBoard(
     floorId: string | null;
     supplyType: NonNullable<DistributionBoardDto["supplyType"]>;
     simultaneityFactor: number;
-  },
+  } & Partial<DistributionBoardInfoDto>,
   expectedRevision: number
 ) {
   return request<DistributionBoardCommandResultDto>(
@@ -341,6 +343,34 @@ export function updateDistributionBoard(
   );
 }
 
+export const documentLogoUrl = "/api/document-branding/logo";
+
+export function getDocumentBranding() {
+  return request<{ logo: DocumentLogoMetadataDto | null }>(
+    "/api/document-branding"
+  );
+}
+
+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`

src/server/composition/application-repositories.ts

@@ -13,6 +13,7 @@ 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);
@@ -33,3 +34,4 @@ 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/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 +1,84 @@
+import type { Request, Response } from "express";
+import type { DocumentBrandingAsset } from "../../db/schema/document-branding-assets.js";
+import {
+  maxDocumentLogoBytes,
+  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 });
+}
+
+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/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 +1,9 @@
+import express from "express";
+import * as documentBrandingController from "../controllers/document-branding.controller.js";
+
+export const documentBrandingRouter = express.Router();
+
+documentBrandingRouter.get("/", documentBrandingController.getDocumentBrandingHandler);
+documentBrandingRouter.get("/logo", documentBrandingController.getDocumentLogoHandler);
+documentBrandingRouter.put("/logo", documentBrandingController.uploadDocumentLogoHandler);
+documentBrandingRouter.delete("/logo", documentBrandingController.deleteDocumentLogoHandler);

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/validation/document-branding.schemas.ts

@@ -0,0 +1,25 @@
+import { z } from "zod";
+
+export const documentLogoMimeTypes = [
+  "image/png",
+  "image/jpeg",
+  "image/svg+xml",
+] as const;
+
+export type DocumentLogoMimeType = (typeof documentLogoMimeTypes)[number];
+
+export const maxDocumentLogoBytes = 2 * 1024 * 1024;
+
+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>;

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

@@ -1,5 +1,9 @@
 import { z } from "zod";
-import { distributionBoardSupplyTypes } from "../constants/distribution-board.js";
+import {
+  distributionBoardInfoFieldMaxLengths,
+  distributionBoardSupplyTypes,
+  type DistributionBoardInfoField,
+} from "../constants/distribution-board.js";
 import { expectedProjectRevisionSchema } from "./project-command.schemas.js";
 
 export const createProjectSchema = z.object({
@@ -42,12 +46,27 @@ 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();
 

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/print-document-model.test.ts

@@ -0,0 +1,176 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  buildPreliminaryBoardHierarchy,
+  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("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/project-snapshot.repository.test.ts

@@ -377,6 +377,67 @@ 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>>;
+      };
+      payload.schemaVersion = 5;
+      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
+        )
+      );
+    } finally {
+      context.close();
+    }
+  });
 });
 
 describe("portable project transfer", () => {

tests/project-state-snapshot.test.ts

@@ -61,6 +61,10 @@ 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: [
@@ -199,9 +203,52 @@ describe("project state snapshot model", () => {
     });
   });
 
+  it("upgrades snapshot version 5 with empty distribution-board info", () => {
+    const previous = protectedSnapshot();
+    previous.schemaVersion = 5 as typeof previous.schemaVersion;
+    for (const board of previous.distributionBoards) {
+      const record = board as Record<string, unknown>;
+      delete record.boardNumber;
+      delete record.location;
+      delete record.fedFrom;
+      delete record.remark;
+    }
+
+    const upgraded = parseProjectStateSnapshot(previous);
+
+    assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
+    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 distribution-board info 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");
+
+    const mislabeled = protectedSnapshot();
+    mislabeled.schemaVersion = 5 as typeof mislabeled.schemaVersion;
+    assert.throws(() => parseProjectStateSnapshot(mislabeled));
+  });
+
   it("upgrades snapshot version 4 with the existing quantity as manual share", () => {
     const previous = protectedSnapshot();
     previous.schemaVersion = 4 as typeof previous.schemaVersion;
+    for (const board of previous.distributionBoards) {
+      const record = board as Record<string, unknown>;
+      delete record.boardNumber;
+      delete record.location;
+      delete record.fedFrom;
+      delete record.remark;
+    }
     previous.circuits[0]!.isReserve = false;
     previous.circuits[0]!.deviceRows = [{
       id: "row-1",