diff --git a/docs/current-architecture.md b/docs/current-architecture.md
index 6c1bff3..ed3812e 100644
--- a/docs/current-architecture.md
+++ b/docs/current-architecture.md
@@ -209,12 +209,16 @@ unverknüpft und vollständig unverändert sind. Gerät, Linkänderungen, Revisi
 und Historienstapel teilen dieselbe Transaktion. Create, Import aus der globalen
 Gerätebibliothek und Delete laufen über dieselbe Command-Grenze; ihre Antworten
 liefern Gerät und aktualisierten Historienstand an die Projektseite zurück.
-`project.update-settings` versioniert die beiden Projekt-Standardspannungen als
-eine atomare Änderung. Der Store leitet das inverse Kommando aus dem
-gespeicherten Projekt ab und schreibt Werte, Revision und Historienstapel
-gemeinsam. `PUT /api/projects/:projectId` verlangt deshalb
-`expectedRevision`, liefert Projekt plus aktualisierten Historienstand und
-besitzt keinen separaten direkten Settings-Schreibweg mehr.
+`project.update-settings` versioniert Projektname, interne und externe
+Projektnummer, Bauherr, Beschreibung sowie beide Standardspannungen als eine
+atomare Änderung. Die Projektseite bearbeitet diese Angaben in einem
+beschrifteten Einstellungsmodal statt in einer permanenten Formularkarte. Der
+Store leitet das inverse Kommando aus dem gespeicherten Projekt ab und schreibt
+Werte, Revision und Historienstapel gemeinsam. `PUT /api/projects/:projectId`
+verlangt deshalb `expectedRevision`, liefert Projekt plus aktualisierten
+Historienstand und besitzt keinen separaten direkten Settings-Schreibweg mehr.
+Kommando- und Snapshot-Versionen vor dieser Erweiterung bleiben les- und
+ausführbar; fehlende Metadaten werden dabei als `null` behandelt.
 `distribution-board.insert` versioniert die Anlage einer Verteilung als einen
 vollständigen Block aus Verteilung, Stromkreisliste und vier Standardbereichen.
 Alle UUIDs entstehen vor dem Command und bleiben über Undo/Redo stabil.
diff --git a/scripts/db-verify-circuit-schema.js b/scripts/db-verify-circuit-schema.js
index fa38fca..2159898 100644
--- a/scripts/db-verify-circuit-schema.js
+++ b/scripts/db-verify-circuit-schema.js
@@ -48,12 +48,25 @@ const circuitColumns = new Set(
   db.prepare("PRAGMA table_info(circuits)").all().map((column) => column.name)
 );
 const missingCircuitColumns = requiredCircuitColumns.filter((name) => !circuitColumns.has(name));
+const requiredProjectColumns = [
+  "internal_project_number",
+  "external_project_number",
+  "building_owner",
+  "description",
+];
+const projectColumns = new Set(
+  db.prepare("PRAGMA table_info(projects)").all().map((column) => column.name)
+);
+const missingProjectColumns = requiredProjectColumns.filter(
+  (name) => !projectColumns.has(name)
+);
 
 console.log("Database:", dbPath);
 console.log("Required tables:", requiredTables.join(", "));
 console.log("Existing tables:", [...existing].join(", ") || "(none)");
 console.log("Required project-device columns:", requiredProjectDeviceColumns.join(", "));
 console.log("Required circuit columns:", requiredCircuitColumns.join(", "));
+console.log("Required project columns:", requiredProjectColumns.join(", "));
 
 if (missing.length > 0) {
   console.error("Missing tables:", missing.join(", "));
@@ -78,4 +91,9 @@ if (missingCircuitColumns.length > 0) {
   process.exit(1);
 }
 
+if (missingProjectColumns.length > 0) {
+  console.error("Missing project columns:", missingProjectColumns.join(", "));
+  process.exit(1);
+}
+
 console.log("Circuit-first schema verification passed.");
diff --git a/src/app/projects/[projectId]/page.tsx b/src/app/projects/[projectId]/page.tsx
index e9d7660..f36c0b6 100644
--- a/src/app/projects/[projectId]/page.tsx
+++ b/src/app/projects/[projectId]/page.tsx
@@ -40,6 +40,10 @@ import {
   type ProjectDeviceSyncField,
 } from "../../../shared/constants/project-device-sync-fields";
 import { ProjectVersionHistory } from "../../../frontend/components/project-version-history";
+import {
+  ProjectSettingsModal,
+  type ProjectSettingsInput,
+} from "../../../frontend/components/project-settings-modal";
 
 const projectDeviceSyncFieldLabels: Record<ProjectDeviceSyncField, string> = {
   name: "Technischer Name",
@@ -92,8 +96,7 @@ export default function ProjectDetailPage() {
   const [roomNumber, setRoomNumber] = useState("");
   const [roomName, setRoomName] = useState("");
   const [roomFloorId, setRoomFloorId] = useState("");
-  const [singlePhaseVoltageV, setSinglePhaseVoltageV] = useState("230");
-  const [threePhaseVoltageV, setThreePhaseVoltageV] = useState("400");
+  const [isProjectSettingsOpen, setIsProjectSettingsOpen] = useState(false);
   const [projectDeviceForm, setProjectDeviceForm] = useState<Record<string, string>>({
     name: "",
     displayName: "",
@@ -142,10 +145,6 @@ export default function ProjectDetailPage() {
       ]) => {
         const currentProject = projects.find((item) => item.id === projectId) ?? null;
         setProject(currentProject);
-        if (currentProject) {
-          setSinglePhaseVoltageV(String(currentProject.singlePhaseVoltageV));
-          setThreePhaseVoltageV(String(currentProject.threePhaseVoltageV));
-        }
         setBoards(distributionBoards);
         setCircuitLists(loadedCircuitLists);
         setFloors(loadedFloors);
@@ -259,7 +258,7 @@ export default function ProjectDetailPage() {
     }
   }
 
-  async function handleSaveProjectSettings() {
+  async function handleSaveProjectSettings(input: ProjectSettingsInput) {
     if (!projectId || !project) {
       return;
     }
@@ -269,12 +268,10 @@ export default function ProjectDetailPage() {
       const result = await updateProjectSettings(
         projectId,
         project.currentRevision,
-        {
-          singlePhaseVoltageV: Number(singlePhaseVoltageV),
-          threePhaseVoltageV: Number(threePhaseVoltageV),
-        }
+        input
       );
       setProject(result.project);
+      setIsProjectSettingsOpen(false);
     } catch (err) {
       setError(err instanceof Error ? err.message : "Projekteigenschaften konnten nicht gespeichert werden.");
     } finally {
@@ -532,66 +529,34 @@ export default function ProjectDetailPage() {
 
   return (
     <main className="container py-4">
-      <div className="d-flex justify-content-between align-items-center mb-3">
+      <div className="d-flex flex-wrap justify-content-between align-items-center gap-3 mb-3">
         <div>
           <h1 className="h3 mb-1">{project?.name ?? "Projekt"}</h1>
-          <p className="text-secondary mb-0">Verteilerübersicht und Einstieg in die Stromkreislisten</p>
+          <p className="text-secondary mb-0">
+            {project?.internalProjectNumber
+              ? `Projektnummer ${project.internalProjectNumber} · `
+              : ""}
+            Verteilerübersicht und Einstieg in die Stromkreislisten
+          </p>
+        </div>
+        <div className="d-flex gap-2">
+          <button
+            className="btn btn-outline-primary"
+            disabled={!project}
+            onClick={() => setIsProjectSettingsOpen(true)}
+            type="button"
+          >
+            Projekteinstellungen
+          </button>
+          <Link className="btn btn-outline-secondary" href="/projects">
+            Zur Projektübersicht
+          </Link>
         </div>
-        <Link className="btn btn-outline-secondary" href="/projects">
-          Zur Projektseite
-        </Link>
       </div>
 
       {error ? <div className="alert alert-warning">{error}</div> : null}
 
       <div className="row g-4">
-        <section className="col-12">
-          <div className="card shadow-sm">
-            <div className="card-header">Projekteigenschaften</div>
-            <div className="card-body">
-              <div className="row g-3 align-items-end">
-                <div className="col-12 col-md-4">
-                  <label className="form-label">Standardspannung 1-phasig [V]</label>
-                  <input
-                    className="form-control"
-                    type="number"
-                    min="1"
-                    value={singlePhaseVoltageV}
-                    onChange={(event) => setSinglePhaseVoltageV(event.target.value)}
-                  />
-                </div>
-                <div className="col-12 col-md-4">
-                  <label className="form-label">Standardspannung 3-phasig [V]</label>
-                  <input
-                    className="form-control"
-                    type="number"
-                    min="1"
-                    value={threePhaseVoltageV}
-                    onChange={(event) => setThreePhaseVoltageV(event.target.value)}
-                  />
-                </div>
-                <div className="col-12 col-md-4">
-                  <button
-                    className="btn btn-primary w-100"
-                    type="button"
-                    onClick={handleSaveProjectSettings}
-                    disabled={
-                      isSaving ||
-                      !project ||
-                      (Number(singlePhaseVoltageV) ===
-                        project.singlePhaseVoltageV &&
-                        Number(threePhaseVoltageV) ===
-                          project.threePhaseVoltageV)
-                    }
-                  >
-                    Projekteigenschaften speichern
-                  </button>
-                </div>
-              </div>
-            </div>
-          </div>
-        </section>
-
         {project ? (
           <section className="col-12">
             <ProjectVersionHistory
@@ -1156,6 +1121,14 @@ export default function ProjectDetailPage() {
         ) : null}
       </section>
 
+      {project && isProjectSettingsOpen ? (
+        <ProjectSettingsModal
+          isSaving={isSaving}
+          onClose={() => setIsProjectSettingsOpen(false)}
+          onSave={handleSaveProjectSettings}
+          project={project}
+        />
+      ) : null}
     </main>
   );
 }
diff --git a/src/db/migrations/0016_dashing_darkstar.sql b/src/db/migrations/0016_dashing_darkstar.sql
new file mode 100644
index 0000000..2228b1b
--- /dev/null
+++ b/src/db/migrations/0016_dashing_darkstar.sql
@@ -0,0 +1,4 @@
+ALTER TABLE `projects` ADD `internal_project_number` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `external_project_number` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `building_owner` text;--> statement-breakpoint
+ALTER TABLE `projects` ADD `description` text;
\ No newline at end of file
diff --git a/src/db/migrations/meta/0016_snapshot.json b/src/db/migrations/meta/0016_snapshot.json
new file mode 100644
index 0000000..1e43d03
--- /dev/null
+++ b/src/db/migrations/meta/0016_snapshot.json
@@ -0,0 +1,1850 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "8502c7d2-e925-42c3-8044-3e965c170f97",
+  "prevId": "3248cb0b-5512-43d3-8193-e7218cb8ae66",
+  "tables": {
+    "circuit_device_rows": {
+      "name": "circuit_device_rows",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_id": {
+          "name": "circuit_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "linked_project_device_id": {
+          "name": "linked_project_device_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "legacy_consumer_id": {
+          "name": "legacy_consumer_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "phase_type": {
+          "name": "phase_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "connection_kind": {
+          "name": "connection_kind",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cost_group": {
+          "name": "cost_group",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "category": {
+          "name": "category",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "level": {
+          "name": "level",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "room_id": {
+          "name": "room_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "room_number_snapshot": {
+          "name": "room_number_snapshot",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "room_name_snapshot": {
+          "name": "room_name_snapshot",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "quantity": {
+          "name": "quantity",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "power_per_unit": {
+          "name": "power_per_unit",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "simultaneity_factor": {
+          "name": "simultaneity_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "cos_phi": {
+          "name": "cos_phi",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "remark": {
+          "name": "remark",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "overridden_fields": {
+          "name": "overridden_fields",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "circuit_device_rows_circuit_id_circuits_id_fk": {
+          "name": "circuit_device_rows_circuit_id_circuits_id_fk",
+          "tableFrom": "circuit_device_rows",
+          "tableTo": "circuits",
+          "columnsFrom": [
+            "circuit_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "circuit_device_rows_linked_project_device_id_project_devices_id_fk": {
+          "name": "circuit_device_rows_linked_project_device_id_project_devices_id_fk",
+          "tableFrom": "circuit_device_rows",
+          "tableTo": "project_devices",
+          "columnsFrom": [
+            "linked_project_device_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "circuit_device_rows_room_id_rooms_id_fk": {
+          "name": "circuit_device_rows_room_id_rooms_id_fk",
+          "tableFrom": "circuit_device_rows",
+          "tableTo": "rooms",
+          "columnsFrom": [
+            "room_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "circuit_lists": {
+      "name": "circuit_lists",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "distribution_board_id": {
+          "name": "distribution_board_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "circuit_lists_distribution_board_id_unique": {
+          "name": "circuit_lists_distribution_board_id_unique",
+          "columns": [
+            "distribution_board_id"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "circuit_lists_project_id_projects_id_fk": {
+          "name": "circuit_lists_project_id_projects_id_fk",
+          "tableFrom": "circuit_lists",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "circuit_lists_distribution_board_id_distribution_boards_id_fk": {
+          "name": "circuit_lists_distribution_board_id_distribution_boards_id_fk",
+          "tableFrom": "circuit_lists",
+          "tableTo": "distribution_boards",
+          "columnsFrom": [
+            "distribution_board_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "circuit_sections": {
+      "name": "circuit_sections",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_list_id": {
+          "name": "circuit_list_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "key": {
+          "name": "key",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "prefix": {
+          "name": "prefix",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {
+        "circuit_sections_list_key_unique": {
+          "name": "circuit_sections_list_key_unique",
+          "columns": [
+            "circuit_list_id",
+            "key"
+          ],
+          "isUnique": true
+        },
+        "circuit_sections_list_prefix_unique": {
+          "name": "circuit_sections_list_prefix_unique",
+          "columns": [
+            "circuit_list_id",
+            "prefix"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "circuit_sections_circuit_list_id_circuit_lists_id_fk": {
+          "name": "circuit_sections_circuit_list_id_circuit_lists_id_fk",
+          "tableFrom": "circuit_sections",
+          "tableTo": "circuit_lists",
+          "columnsFrom": [
+            "circuit_list_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "circuits": {
+      "name": "circuits",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_list_id": {
+          "name": "circuit_list_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "section_id": {
+          "name": "section_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "equipment_identifier": {
+          "name": "equipment_identifier",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "protection_type": {
+          "name": "protection_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "protection_rated_current": {
+          "name": "protection_rated_current",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "protection_characteristic": {
+          "name": "protection_characteristic",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cable_type": {
+          "name": "cable_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cable_cross_section": {
+          "name": "cable_cross_section",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cable_length": {
+          "name": "cable_length",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "rcd_assignment": {
+          "name": "rcd_assignment",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "terminal_designation": {
+          "name": "terminal_designation",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "voltage": {
+          "name": "voltage",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "control_requirement": {
+          "name": "control_requirement",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "status": {
+          "name": "status",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "is_reserve": {
+          "name": "is_reserve",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "remark": {
+          "name": "remark",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "circuits_list_equipment_identifier_unique": {
+          "name": "circuits_list_equipment_identifier_unique",
+          "columns": [
+            "circuit_list_id",
+            "equipment_identifier"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "circuits_circuit_list_id_circuit_lists_id_fk": {
+          "name": "circuits_circuit_list_id_circuit_lists_id_fk",
+          "tableFrom": "circuits",
+          "tableTo": "circuit_lists",
+          "columnsFrom": [
+            "circuit_list_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "circuits_section_id_circuit_sections_id_fk": {
+          "name": "circuits_section_id_circuit_sections_id_fk",
+          "tableFrom": "circuits",
+          "tableTo": "circuit_sections",
+          "columnsFrom": [
+            "section_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "consumers": {
+      "name": "consumers",
+      "columns": {
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+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "distribution_board_id": {
+          "name": "distribution_board_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "circuit_list_id": {
+          "name": "circuit_list_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "project_device_id": {
+          "name": "project_device_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "is_linked_to_device": {
+          "name": "is_linked_to_device",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "room_id": {
+          "name": "room_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "circuit_number": {
+          "name": "circuit_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "category": {
+          "name": "category",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "device_type": {
+          "name": "device_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "phase_type": {
+          "name": "phase_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "trade_or_cost_group": {
+          "name": "trade_or_cost_group",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "group_name": {
+          "name": "group_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "protection_type": {
+          "name": "protection_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "protection_rated_current": {
+          "name": "protection_rated_current",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "protection_characteristic": {
+          "name": "protection_characteristic",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cable_type": {
+          "name": "cable_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cable_cross_section": {
+          "name": "cable_cross_section",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "comment": {
+          "name": "comment",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "quantity": {
+          "name": "quantity",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "installed_power_per_unit_kw": {
+          "name": "installed_power_per_unit_kw",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "demand_factor": {
+          "name": "demand_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "voltage_v": {
+          "name": "voltage_v",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "phase_count": {
+          "name": "phase_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "power_factor": {
+          "name": "power_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "note": {
+          "name": "note",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "consumers_project_id_projects_id_fk": {
+          "name": "consumers_project_id_projects_id_fk",
+          "tableFrom": "consumers",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "consumers_distribution_board_id_distribution_boards_id_fk": {
+          "name": "consumers_distribution_board_id_distribution_boards_id_fk",
+          "tableFrom": "consumers",
+          "tableTo": "distribution_boards",
+          "columnsFrom": [
+            "distribution_board_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "consumers_circuit_list_id_circuit_lists_id_fk": {
+          "name": "consumers_circuit_list_id_circuit_lists_id_fk",
+          "tableFrom": "consumers",
+          "tableTo": "circuit_lists",
+          "columnsFrom": [
+            "circuit_list_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "consumers_project_device_id_project_devices_id_fk": {
+          "name": "consumers_project_device_id_project_devices_id_fk",
+          "tableFrom": "consumers",
+          "tableTo": "project_devices",
+          "columnsFrom": [
+            "project_device_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "consumers_room_id_rooms_id_fk": {
+          "name": "consumers_room_id_rooms_id_fk",
+          "tableFrom": "consumers",
+          "tableTo": "rooms",
+          "columnsFrom": [
+            "room_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "distribution_boards": {
+      "name": "distribution_boards",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "distribution_boards_project_id_projects_id_fk": {
+          "name": "distribution_boards_project_id_projects_id_fk",
+          "tableFrom": "distribution_boards",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "floors": {
+      "name": "floors",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "sort_order": {
+          "name": "sort_order",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "floors_project_id_projects_id_fk": {
+          "name": "floors_project_id_projects_id_fk",
+          "tableFrom": "floors",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "global_devices": {
+      "name": "global_devices",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "category": {
+          "name": "category",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "quantity": {
+          "name": "quantity",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "installed_power_per_unit_kw": {
+          "name": "installed_power_per_unit_kw",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "demand_factor": {
+          "name": "demand_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "voltage_v": {
+          "name": "voltage_v",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "phase_count": {
+          "name": "phase_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "power_factor": {
+          "name": "power_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "note": {
+          "name": "note",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "legacy_consumer_circuit_migrations": {
+      "name": "legacy_consumer_circuit_migrations",
+      "columns": {
+        "consumer_id": {
+          "name": "consumer_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_id": {
+          "name": "circuit_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_device_row_id": {
+          "name": "circuit_device_row_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_list_id": {
+          "name": "circuit_list_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at_iso": {
+          "name": "created_at_iso",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "legacy_consumer_circuit_migrations_circuit_id_circuits_id_fk": {
+          "name": "legacy_consumer_circuit_migrations_circuit_id_circuits_id_fk",
+          "tableFrom": "legacy_consumer_circuit_migrations",
+          "tableTo": "circuits",
+          "columnsFrom": [
+            "circuit_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "legacy_consumer_circuit_migrations_circuit_device_row_id_circuit_device_rows_id_fk": {
+          "name": "legacy_consumer_circuit_migrations_circuit_device_row_id_circuit_device_rows_id_fk",
+          "tableFrom": "legacy_consumer_circuit_migrations",
+          "tableTo": "circuit_device_rows",
+          "columnsFrom": [
+            "circuit_device_row_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "legacy_consumer_circuit_migrations_circuit_list_id_circuit_lists_id_fk": {
+          "name": "legacy_consumer_circuit_migrations_circuit_list_id_circuit_lists_id_fk",
+          "tableFrom": "legacy_consumer_circuit_migrations",
+          "tableTo": "circuit_lists",
+          "columnsFrom": [
+            "circuit_list_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "legacy_consumer_migration_reports": {
+      "name": "legacy_consumer_migration_reports",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "circuit_list_id": {
+          "name": "circuit_list_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "legacy_consumer_count": {
+          "name": "legacy_consumer_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_circuit_count": {
+          "name": "created_circuit_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_device_row_count": {
+          "name": "created_device_row_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "duplicate_grouped_count": {
+          "name": "duplicate_grouped_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "generated_identifier_count": {
+          "name": "generated_identifier_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "unassigned_row_count": {
+          "name": "unassigned_row_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "warnings_json": {
+          "name": "warnings_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "generated_identifiers_json": {
+          "name": "generated_identifiers_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "duplicate_groups_json": {
+          "name": "duplicate_groups_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at_iso": {
+          "name": "created_at_iso",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "legacy_consumer_migration_reports_list_unique": {
+          "name": "legacy_consumer_migration_reports_list_unique",
+          "columns": [
+            "circuit_list_id"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "legacy_consumer_migration_reports_circuit_list_id_circuit_lists_id_fk": {
+          "name": "legacy_consumer_migration_reports_circuit_list_id_circuit_lists_id_fk",
+          "tableFrom": "legacy_consumer_migration_reports",
+          "tableTo": "circuit_lists",
+          "columnsFrom": [
+            "circuit_list_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "project_change_sets": {
+      "name": "project_change_sets",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_revision_id": {
+          "name": "project_revision_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "command_type": {
+          "name": "command_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "payload_schema_version": {
+          "name": "payload_schema_version",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "forward_payload_json": {
+          "name": "forward_payload_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "inverse_payload_json": {
+          "name": "inverse_payload_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "project_change_sets_revision_unique": {
+          "name": "project_change_sets_revision_unique",
+          "columns": [
+            "project_revision_id"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "project_change_sets_project_revision_id_project_revisions_id_fk": {
+          "name": "project_change_sets_project_revision_id_project_revisions_id_fk",
+          "tableFrom": "project_change_sets",
+          "tableTo": "project_revisions",
+          "columnsFrom": [
+            "project_revision_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "project_devices": {
+      "name": "project_devices",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "phase_type": {
+          "name": "phase_type",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'single_phase'"
+        },
+        "connection_kind": {
+          "name": "connection_kind",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cost_group": {
+          "name": "cost_group",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "category": {
+          "name": "category",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "quantity": {
+          "name": "quantity",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "power_per_unit": {
+          "name": "power_per_unit",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "simultaneity_factor": {
+          "name": "simultaneity_factor",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        },
+        "cos_phi": {
+          "name": "cos_phi",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "remark": {
+          "name": "remark",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "voltage_v": {
+          "name": "voltage_v",
+          "type": "real",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "project_devices_project_id_projects_id_fk": {
+          "name": "project_devices_project_id_projects_id_fk",
+          "tableFrom": "project_devices",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "project_history_stack_entries": {
+      "name": "project_history_stack_entries",
+      "columns": {
+        "change_set_id": {
+          "name": "change_set_id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "stack": {
+          "name": "stack",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "position": {
+          "name": "position",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "project_history_stack_entries_position_unique": {
+          "name": "project_history_stack_entries_position_unique",
+          "columns": [
+            "project_id",
+            "stack",
+            "position"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "project_history_stack_entries_change_set_id_project_change_sets_id_fk": {
+          "name": "project_history_stack_entries_change_set_id_project_change_sets_id_fk",
+          "tableFrom": "project_history_stack_entries",
+          "tableTo": "project_change_sets",
+          "columnsFrom": [
+            "change_set_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "project_history_stack_entries_project_id_projects_id_fk": {
+          "name": "project_history_stack_entries_project_id_projects_id_fk",
+          "tableFrom": "project_history_stack_entries",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {
+        "project_history_stack_entries_stack_check": {
+          "name": "project_history_stack_entries_stack_check",
+          "value": "\"project_history_stack_entries\".\"stack\" in ('undo', 'redo')"
+        }
+      }
+    },
+    "project_revisions": {
+      "name": "project_revisions",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "revision_number": {
+          "name": "revision_number",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at_iso": {
+          "name": "created_at_iso",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "actor_id": {
+          "name": "actor_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "source": {
+          "name": "source",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "project_revisions_project_number_unique": {
+          "name": "project_revisions_project_number_unique",
+          "columns": [
+            "project_id",
+            "revision_number"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "project_revisions_project_id_projects_id_fk": {
+          "name": "project_revisions_project_id_projects_id_fk",
+          "tableFrom": "project_revisions",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "project_snapshots": {
+      "name": "project_snapshots",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "source_revision": {
+          "name": "source_revision",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "schema_version": {
+          "name": "schema_version",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "kind": {
+          "name": "kind",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'named'"
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "payload_json": {
+          "name": "payload_json",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "payload_sha256": {
+          "name": "payload_sha256",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at_iso": {
+          "name": "created_at_iso",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_by_actor_id": {
+          "name": "created_by_actor_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "project_snapshots_project_created_idx": {
+          "name": "project_snapshots_project_created_idx",
+          "columns": [
+            "project_id",
+            "created_at_iso"
+          ],
+          "isUnique": false
+        },
+        "project_snapshots_project_kind_revision_idx": {
+          "name": "project_snapshots_project_kind_revision_idx",
+          "columns": [
+            "project_id",
+            "kind",
+            "source_revision"
+          ],
+          "isUnique": false
+        },
+        "project_snapshots_project_name_unique": {
+          "name": "project_snapshots_project_name_unique",
+          "columns": [
+            "project_id",
+            "name"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "project_snapshots_project_id_projects_id_fk": {
+          "name": "project_snapshots_project_id_projects_id_fk",
+          "tableFrom": "project_snapshots",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "projects": {
+      "name": "projects",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "internal_project_number": {
+          "name": "internal_project_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "external_project_number": {
+          "name": "external_project_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "building_owner": {
+          "name": "building_owner",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "single_phase_voltage_v": {
+          "name": "single_phase_voltage_v",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 230
+        },
+        "three_phase_voltage_v": {
+          "name": "three_phase_voltage_v",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 400
+        },
+        "current_revision": {
+          "name": "current_revision",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    },
+    "rooms": {
+      "name": "rooms",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "project_id": {
+          "name": "project_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "floor_id": {
+          "name": "floor_id",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "room_number": {
+          "name": "room_number",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "room_name": {
+          "name": "room_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "rooms_project_id_projects_id_fk": {
+          "name": "rooms_project_id_projects_id_fk",
+          "tableFrom": "rooms",
+          "tableTo": "projects",
+          "columnsFrom": [
+            "project_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "rooms_floor_id_floors_id_fk": {
+          "name": "rooms_floor_id_floors_id_fk",
+          "tableFrom": "rooms",
+          "tableTo": "floors",
+          "columnsFrom": [
+            "floor_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "checkConstraints": {}
+    }
+  },
+  "views": {},
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
\ No newline at end of file
diff --git a/src/db/migrations/meta/_journal.json b/src/db/migrations/meta/_journal.json
index 152562d..580b1ce 100644
--- a/src/db/migrations/meta/_journal.json
+++ b/src/db/migrations/meta/_journal.json
@@ -113,6 +113,13 @@
       "when": 1785014383032,
       "tag": "0015_modern_madame_masque",
       "breakpoints": true
+    },
+    {
+      "idx": 16,
+      "version": "6",
+      "when": 1785254079435,
+      "tag": "0016_dashing_darkstar",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/src/db/repositories/project-settings-project-command.repository.ts b/src/db/repositories/project-settings-project-command.repository.ts
index f767b8f..10485ff 100644
--- a/src/db/repositories/project-settings-project-command.repository.ts
+++ b/src/db/repositories/project-settings-project-command.repository.ts
@@ -2,6 +2,8 @@ import { eq } from "drizzle-orm";
 import {
   assertProjectSettingsUpdateProjectCommand,
   createProjectSettingsUpdateProjectCommand,
+  legacyProjectSettingsUpdateCommandSchemaVersion,
+  type ProjectSettingsValues,
 } from "../../domain/models/project-settings-project-command.model.js";
 import type {
   ExecuteProjectSettingsUpdateCommandInput,
@@ -37,22 +39,45 @@ export class ProjectSettingsProjectCommandRepository
     if (!current) {
       throw new Error("Project not found.");
     }
-    if (
-      current.singlePhaseVoltageV ===
-        input.command.payload.singlePhaseVoltageV &&
-      current.threePhaseVoltageV ===
-        input.command.payload.threePhaseVoltageV
-    ) {
+    const target: ProjectSettingsValues =
+      input.command.schemaVersion ===
+      legacyProjectSettingsUpdateCommandSchemaVersion
+        ? {
+            name: current.name,
+            internalProjectNumber: current.internalProjectNumber,
+            externalProjectNumber: current.externalProjectNumber,
+            buildingOwner: current.buildingOwner,
+            description: current.description,
+            ...input.command.payload,
+          }
+        : input.command.payload;
+    if (projectSettingsEqual(current, target)) {
       throw new Error("Project settings did not change.");
     }
 
-    const inverse = createProjectSettingsUpdateProjectCommand({
-      singlePhaseVoltageV: current.singlePhaseVoltageV,
-      threePhaseVoltageV: current.threePhaseVoltageV,
-    });
+    const inverse =
+      input.command.schemaVersion ===
+      legacyProjectSettingsUpdateCommandSchemaVersion
+        ? {
+            schemaVersion: legacyProjectSettingsUpdateCommandSchemaVersion,
+            type: input.command.type,
+            payload: {
+              singlePhaseVoltageV: current.singlePhaseVoltageV,
+              threePhaseVoltageV: current.threePhaseVoltageV,
+            },
+          }
+        : createProjectSettingsUpdateProjectCommand({
+            name: current.name,
+            internalProjectNumber: current.internalProjectNumber,
+            externalProjectNumber: current.externalProjectNumber,
+            buildingOwner: current.buildingOwner,
+            description: current.description,
+            singlePhaseVoltageV: current.singlePhaseVoltageV,
+            threePhaseVoltageV: current.threePhaseVoltageV,
+          });
     const updated = tx
       .update(projects)
-      .set(input.command.payload)
+      .set(target)
       .where(eq(projects.id, input.projectId))
       .run();
     if (updated.changes !== 1) {
@@ -62,3 +87,18 @@ export class ProjectSettingsProjectCommandRepository
     return inverse;
   }
 }
+
+function projectSettingsEqual(
+  current: ProjectSettingsValues,
+  target: ProjectSettingsValues
+) {
+  return (
+    current.name === target.name &&
+    current.internalProjectNumber === target.internalProjectNumber &&
+    current.externalProjectNumber === target.externalProjectNumber &&
+    current.buildingOwner === target.buildingOwner &&
+    current.description === target.description &&
+    current.singlePhaseVoltageV === target.singlePhaseVoltageV &&
+    current.threePhaseVoltageV === target.threePhaseVoltageV
+  );
+}
diff --git a/src/db/repositories/project-snapshot.repository.ts b/src/db/repositories/project-snapshot.repository.ts
index 5274fee..8fee255 100644
--- a/src/db/repositories/project-snapshot.repository.ts
+++ b/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,
+  legacyProjectStateSnapshotSchemaVersion,
   projectStateSnapshotSchemaVersion,
 } from "../../domain/models/project-state-snapshot.model.js";
 import type {
@@ -138,7 +139,10 @@ export class ProjectSnapshotRepository implements ProjectSnapshotStore {
     if (actualChecksum !== stored.payloadSha256) {
       throw new Error("Project snapshot checksum verification failed.");
     }
-    if (stored.schemaVersion !== projectStateSnapshotSchemaVersion) {
+    if (
+      stored.schemaVersion !== legacyProjectStateSnapshotSchemaVersion &&
+      stored.schemaVersion !== projectStateSnapshotSchemaVersion
+    ) {
       throw new Error("Project snapshot schema version is not supported.");
     }
     const targetState = deserializeProjectStateSnapshot(stored.payloadJson);
diff --git a/src/db/repositories/project-state-restore-command.repository.ts b/src/db/repositories/project-state-restore-command.repository.ts
index 8a67fac..28c6168 100644
--- a/src/db/repositories/project-state-restore-command.repository.ts
+++ b/src/db/repositories/project-state-restore-command.repository.ts
@@ -5,6 +5,7 @@ import {
   createProjectStateRestoreCommand,
 } from "../../domain/models/project-state-restore-command.model.js";
 import {
+  parseProjectStateSnapshot,
   serializeProjectStateSnapshot,
   type ProjectStateSnapshot,
 } from "../../domain/models/project-state-snapshot.model.js";
@@ -38,7 +39,10 @@ export class ProjectStateRestoreCommandRepository
 
   execute(input: ExecuteProjectStateRestoreCommandInput) {
     assertProjectStateRestoreCommand(input.command);
-    if (input.command.payload.targetState.project.id !== input.projectId) {
+    const targetState = parseProjectStateSnapshot(
+      input.command.payload.targetState
+    );
+    if (targetState.project.id !== input.projectId) {
       throw new Error("Restore state belongs to a different project.");
     }
 
@@ -68,15 +72,16 @@ export class ProjectStateRestoreCommandRepository
       );
     }
 
-    const targetPayloadJson = serializeProjectStateSnapshot(
+    const targetState = parseProjectStateSnapshot(
       input.command.payload.targetState
     );
+    const targetPayloadJson = serializeProjectStateSnapshot(targetState);
     const inverse = createProjectStateRestoreCommand(
       hashProjectStatePayload(targetPayloadJson),
       current.state
     );
 
-    replaceProjectState(tx, input.command.payload.targetState);
+    replaceProjectState(tx, targetState);
 
     return inverse;
   }
@@ -111,6 +116,10 @@ function replaceProjectState(
     .update(projects)
     .set({
       name: state.project.name,
+      internalProjectNumber: state.project.internalProjectNumber,
+      externalProjectNumber: state.project.externalProjectNumber,
+      buildingOwner: state.project.buildingOwner,
+      description: state.project.description,
       singlePhaseVoltageV: state.project.singlePhaseVoltageV,
       threePhaseVoltageV: state.project.threePhaseVoltageV,
     })
diff --git a/src/db/repositories/project-state-snapshot.persistence.ts b/src/db/repositories/project-state-snapshot.persistence.ts
index 3183c4f..d399dad 100644
--- a/src/db/repositories/project-state-snapshot.persistence.ts
+++ b/src/db/repositories/project-state-snapshot.persistence.ts
@@ -32,6 +32,10 @@ export function readProjectStateSnapshot(
     .select({
       id: projects.id,
       name: projects.name,
+      internalProjectNumber: projects.internalProjectNumber,
+      externalProjectNumber: projects.externalProjectNumber,
+      buildingOwner: projects.buildingOwner,
+      description: projects.description,
       singlePhaseVoltageV: projects.singlePhaseVoltageV,
       threePhaseVoltageV: projects.threePhaseVoltageV,
       currentRevision: projects.currentRevision,
@@ -172,6 +176,10 @@ export function readProjectStateSnapshot(
     project: {
       id: project.id,
       name: project.name,
+      internalProjectNumber: project.internalProjectNumber,
+      externalProjectNumber: project.externalProjectNumber,
+      buildingOwner: project.buildingOwner,
+      description: project.description,
       singlePhaseVoltageV: project.singlePhaseVoltageV,
       threePhaseVoltageV: project.threePhaseVoltageV,
     },
diff --git a/src/db/repositories/project.repository.ts b/src/db/repositories/project.repository.ts
index 0ef03a2..d729422 100644
--- a/src/db/repositories/project.repository.ts
+++ b/src/db/repositories/project.repository.ts
@@ -20,6 +20,10 @@ export class ProjectRepository {
     const project = {
       id,
       name: input.name,
+      internalProjectNumber: input.internalProjectNumber ?? null,
+      externalProjectNumber: input.externalProjectNumber ?? null,
+      buildingOwner: input.buildingOwner ?? null,
+      description: input.description ?? null,
       singlePhaseVoltageV: input.singlePhaseVoltageV ?? 230,
       threePhaseVoltageV: input.threePhaseVoltageV ?? 400,
       currentRevision: 0,
diff --git a/src/db/schema/projects.ts b/src/db/schema/projects.ts
index b0d27b1..05d6324 100644
--- a/src/db/schema/projects.ts
+++ b/src/db/schema/projects.ts
@@ -3,6 +3,10 @@ import { integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
 export const projects = sqliteTable("projects", {
   id: text("id").primaryKey(),
   name: text("name").notNull(),
+  internalProjectNumber: text("internal_project_number"),
+  externalProjectNumber: text("external_project_number"),
+  buildingOwner: text("building_owner"),
+  description: text("description"),
   singlePhaseVoltageV: integer("single_phase_voltage_v").notNull().default(230),
   threePhaseVoltageV: integer("three_phase_voltage_v").notNull().default(400),
   currentRevision: integer("current_revision").notNull().default(0),
diff --git a/src/domain/models/project-settings-project-command.model.ts b/src/domain/models/project-settings-project-command.model.ts
index bd9110a..df943ef 100644
--- a/src/domain/models/project-settings-project-command.model.ts
+++ b/src/domain/models/project-settings-project-command.model.ts
@@ -2,23 +2,42 @@ import type { SerializedProjectCommand } from "./project-command.model.js";
 
 export const projectSettingsUpdateCommandType =
   "project.update-settings" as const;
-export const projectSettingsUpdateCommandSchemaVersion = 1 as const;
+export const legacyProjectSettingsUpdateCommandSchemaVersion = 1 as const;
+export const projectSettingsUpdateCommandSchemaVersion = 2 as const;
 
-export interface ProjectSettingsValues {
+export interface LegacyProjectSettingsValues {
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
 }
 
-export interface ProjectSettingsUpdateProjectCommand
+export interface ProjectSettingsValues extends LegacyProjectSettingsValues {
+  name: string;
+  internalProjectNumber: string | null;
+  externalProjectNumber: string | null;
+  buildingOwner: string | null;
+  description: string | null;
+}
+
+export interface LegacyProjectSettingsUpdateProjectCommand
+  extends SerializedProjectCommand<LegacyProjectSettingsValues> {
+  schemaVersion: typeof legacyProjectSettingsUpdateCommandSchemaVersion;
+  type: typeof projectSettingsUpdateCommandType;
+}
+
+export interface CurrentProjectSettingsUpdateProjectCommand
   extends SerializedProjectCommand<ProjectSettingsValues> {
   schemaVersion: typeof projectSettingsUpdateCommandSchemaVersion;
   type: typeof projectSettingsUpdateCommandType;
 }
 
+export type ProjectSettingsUpdateProjectCommand =
+  | LegacyProjectSettingsUpdateProjectCommand
+  | CurrentProjectSettingsUpdateProjectCommand;
+
 export function createProjectSettingsUpdateProjectCommand(
   values: ProjectSettingsValues
-): ProjectSettingsUpdateProjectCommand {
-  const command: ProjectSettingsUpdateProjectCommand = {
+): CurrentProjectSettingsUpdateProjectCommand {
+  const command: CurrentProjectSettingsUpdateProjectCommand = {
     schemaVersion: projectSettingsUpdateCommandSchemaVersion,
     type: projectSettingsUpdateCommandType,
     payload: { ...values },
@@ -31,16 +50,45 @@ export function assertProjectSettingsUpdateProjectCommand(
   command: SerializedProjectCommand<unknown>
 ): asserts command is ProjectSettingsUpdateProjectCommand {
   if (
-    command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion ||
-    command.type !== projectSettingsUpdateCommandType
+    command.type !== projectSettingsUpdateCommandType ||
+    (command.schemaVersion !==
+      legacyProjectSettingsUpdateCommandSchemaVersion &&
+      command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion)
   ) {
     throw new Error("Unsupported project settings update command.");
   }
+  if (!isPlainObject(command.payload)) {
+    throw new Error(
+      "Project settings update command contains invalid values."
+    );
+  }
+  if (command.schemaVersion === legacyProjectSettingsUpdateCommandSchemaVersion) {
+    assertLegacyValues(command.payload);
+    return;
+  }
   if (
-    !isPlainObject(command.payload) ||
+    !isTrimmedString(command.payload.name, 1, 200) ||
+    !isNullableTrimmedString(command.payload.internalProjectNumber, 100) ||
+    !isNullableTrimmedString(command.payload.externalProjectNumber, 100) ||
+    !isNullableTrimmedString(command.payload.buildingOwner, 200) ||
+    !isNullableTrimmedString(command.payload.description, 2000) ||
     !isPositiveFiniteNumber(command.payload.singlePhaseVoltageV) ||
     !isPositiveFiniteNumber(command.payload.threePhaseVoltageV) ||
-    Object.keys(command.payload).length !== 2
+    Object.keys(command.payload).length !== 7
+  ) {
+    throw new Error(
+      "Project settings update command contains invalid values."
+    );
+  }
+}
+
+function assertLegacyValues(
+  payload: Record<string, unknown>
+): asserts payload is Record<string, unknown> & LegacyProjectSettingsValues {
+  if (
+    !isPositiveFiniteNumber(payload.singlePhaseVoltageV) ||
+    !isPositiveFiniteNumber(payload.threePhaseVoltageV) ||
+    Object.keys(payload).length !== 2
   ) {
     throw new Error(
       "Project settings update command contains invalid voltages."
@@ -59,3 +107,26 @@ function isPositiveFiniteNumber(value: unknown): value is number {
 function isPlainObject(value: unknown): value is Record<string, unknown> {
   return value !== null && typeof value === "object" && !Array.isArray(value);
 }
+
+function isTrimmedString(
+  value: unknown,
+  minimumLength: number,
+  maximumLength: number
+): value is string {
+  return (
+    typeof value === "string" &&
+    value === value.trim() &&
+    value.length >= minimumLength &&
+    value.length <= maximumLength
+  );
+}
+
+function isNullableTrimmedString(
+  value: unknown,
+  maximumLength: number
+): value is string | null {
+  return (
+    value === null ||
+    (isTrimmedString(value, 1, maximumLength))
+  );
+}
diff --git a/src/domain/models/project-state-snapshot.model.ts b/src/domain/models/project-state-snapshot.model.ts
index 7b44ea2..cd74685 100644
--- a/src/domain/models/project-state-snapshot.model.ts
+++ b/src/domain/models/project-state-snapshot.model.ts
@@ -1,12 +1,13 @@
 import { z } from "zod";
 
-export const projectStateSnapshotSchemaVersion = 1 as const;
+export const legacyProjectStateSnapshotSchemaVersion = 1 as const;
+export const projectStateSnapshotSchemaVersion = 2 as const;
 
 const idSchema = z.string().trim().min(1);
 const nullableStringSchema = z.string().nullable();
 const finiteNumberSchema = z.number().finite();
 
-const projectSchema = z
+const legacyProjectSchema = z
   .object({
     id: idSchema,
     name: z.string().trim().min(1),
@@ -15,6 +16,13 @@ const projectSchema = z
   })
   .strict();
 
+const projectSchema = legacyProjectSchema.extend({
+  internalProjectNumber: z.string().trim().min(1).max(100).nullable(),
+  externalProjectNumber: z.string().trim().min(1).max(100).nullable(),
+  buildingOwner: z.string().trim().min(1).max(200).nullable(),
+  description: z.string().trim().min(1).max(2000).nullable(),
+});
+
 const distributionBoardSchema = z
   .object({
     id: idSchema,
@@ -132,17 +140,29 @@ const roomSchema = z
   })
   .strict();
 
+const projectStateSnapshotContents = {
+  distributionBoards: z.array(distributionBoardSchema),
+  circuitLists: z.array(circuitListSchema),
+  circuitSections: z.array(circuitSectionSchema),
+  circuits: z.array(circuitSchema),
+  projectDevices: z.array(projectDeviceSchema),
+  floors: z.array(floorSchema),
+  rooms: z.array(roomSchema),
+};
+
+const legacyProjectStateSnapshotSchema = z
+  .object({
+    schemaVersion: z.literal(legacyProjectStateSnapshotSchemaVersion),
+    project: legacyProjectSchema,
+    ...projectStateSnapshotContents,
+  })
+  .strict();
+
 export const projectStateSnapshotSchema = z
   .object({
     schemaVersion: z.literal(projectStateSnapshotSchemaVersion),
     project: projectSchema,
-    distributionBoards: z.array(distributionBoardSchema),
-    circuitLists: z.array(circuitListSchema),
-    circuitSections: z.array(circuitSectionSchema),
-    circuits: z.array(circuitSchema),
-    projectDevices: z.array(projectDeviceSchema),
-    floors: z.array(floorSchema),
-    rooms: z.array(roomSchema),
+    ...projectStateSnapshotContents,
   })
   .strict();
 
@@ -153,11 +173,37 @@ export type ProjectStateSnapshot = z.infer<
 export function parseProjectStateSnapshot(
   value: unknown
 ): ProjectStateSnapshot {
-  const snapshot = projectStateSnapshotSchema.parse(value);
+  const version = isPlainObject(value) ? value.schemaVersion : undefined;
+  const snapshot =
+    version === legacyProjectStateSnapshotSchemaVersion
+      ? upgradeLegacyProjectStateSnapshot(
+          legacyProjectStateSnapshotSchema.parse(value)
+        )
+      : projectStateSnapshotSchema.parse(value);
   assertProjectStateSnapshotRelations(snapshot);
   return snapshot;
 }
 
+function upgradeLegacyProjectStateSnapshot(
+  snapshot: z.infer<typeof legacyProjectStateSnapshotSchema>
+): ProjectStateSnapshot {
+  return {
+    ...snapshot,
+    schemaVersion: projectStateSnapshotSchemaVersion,
+    project: {
+      ...snapshot.project,
+      internalProjectNumber: null,
+      externalProjectNumber: null,
+      buildingOwner: null,
+      description: null,
+    },
+  };
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}
+
 export function serializeProjectStateSnapshot(
   snapshot: ProjectStateSnapshot
 ): string {
diff --git a/src/frontend/components/project-settings-modal.tsx b/src/frontend/components/project-settings-modal.tsx
new file mode 100644
index 0000000..e19d130
--- /dev/null
+++ b/src/frontend/components/project-settings-modal.tsx
@@ -0,0 +1,225 @@
+"use client";
+
+import { FormEvent, useState } from "react";
+import type { ProjectDto } from "../types";
+
+export interface ProjectSettingsInput {
+  name: string;
+  internalProjectNumber: string | null;
+  externalProjectNumber: string | null;
+  buildingOwner: string | null;
+  description: string | null;
+  singlePhaseVoltageV: number;
+  threePhaseVoltageV: number;
+}
+
+interface ProjectSettingsModalProps {
+  isSaving: boolean;
+  onClose: () => void;
+  onSave: (input: ProjectSettingsInput) => Promise<void>;
+  project: ProjectDto;
+}
+
+export function ProjectSettingsModal({
+  isSaving,
+  onClose,
+  onSave,
+  project,
+}: ProjectSettingsModalProps) {
+  const [name, setName] = useState(project.name);
+  const [internalProjectNumber, setInternalProjectNumber] = useState(
+    project.internalProjectNumber ?? ""
+  );
+  const [externalProjectNumber, setExternalProjectNumber] = useState(
+    project.externalProjectNumber ?? ""
+  );
+  const [buildingOwner, setBuildingOwner] = useState(
+    project.buildingOwner ?? ""
+  );
+  const [description, setDescription] = useState(
+    project.description ?? ""
+  );
+  const [singlePhaseVoltageV, setSinglePhaseVoltageV] = useState(
+    String(project.singlePhaseVoltageV)
+  );
+  const [threePhaseVoltageV, setThreePhaseVoltageV] = useState(
+    String(project.threePhaseVoltageV)
+  );
+
+  async function handleSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    await onSave({
+      name: name.trim(),
+      internalProjectNumber: toNullableString(internalProjectNumber),
+      externalProjectNumber: toNullableString(externalProjectNumber),
+      buildingOwner: toNullableString(buildingOwner),
+      description: toNullableString(description),
+      singlePhaseVoltageV: Number(singlePhaseVoltageV),
+      threePhaseVoltageV: Number(threePhaseVoltageV),
+    });
+  }
+
+  const isValid =
+    name.trim().length > 0 &&
+    Number(singlePhaseVoltageV) > 0 &&
+    Number(threePhaseVoltageV) > 0;
+
+  return (
+    <>
+      <div
+        aria-labelledby="project-settings-title"
+        aria-modal="true"
+        className="modal fade show d-block"
+        role="dialog"
+        tabIndex={-1}
+      >
+        <div className="modal-dialog modal-lg modal-dialog-centered">
+          <form className="modal-content" onSubmit={handleSubmit}>
+            <div className="modal-header">
+              <div>
+                <h2 className="modal-title fs-5" id="project-settings-title">
+                  Projekteinstellungen
+                </h2>
+                <p className="text-secondary small mb-0">
+                  Stammdaten und elektrische Standardwerte des Projekts
+                </p>
+              </div>
+              <button
+                aria-label="Schließen"
+                className="btn-close"
+                disabled={isSaving}
+                onClick={onClose}
+                type="button"
+              />
+            </div>
+            <div className="modal-body">
+              <div className="row g-3">
+                <div className="col-12">
+                  <label className="form-label" htmlFor="project-name">
+                    Projektname
+                  </label>
+                  <input
+                    autoFocus
+                    className="form-control"
+                    id="project-name"
+                    maxLength={200}
+                    onChange={(event) => setName(event.target.value)}
+                    required
+                    value={name}
+                  />
+                </div>
+                <div className="col-12 col-md-6">
+                  <label className="form-label" htmlFor="internal-project-number">
+                    Projektnummer intern
+                  </label>
+                  <input
+                    className="form-control"
+                    id="internal-project-number"
+                    maxLength={100}
+                    onChange={(event) =>
+                      setInternalProjectNumber(event.target.value)
+                    }
+                    value={internalProjectNumber}
+                  />
+                </div>
+                <div className="col-12 col-md-6">
+                  <label className="form-label" htmlFor="external-project-number">
+                    Projektnummer extern
+                  </label>
+                  <input
+                    className="form-control"
+                    id="external-project-number"
+                    maxLength={100}
+                    onChange={(event) =>
+                      setExternalProjectNumber(event.target.value)
+                    }
+                    value={externalProjectNumber}
+                  />
+                </div>
+                <div className="col-12">
+                  <label className="form-label" htmlFor="building-owner">
+                    Bauherr
+                  </label>
+                  <input
+                    className="form-control"
+                    id="building-owner"
+                    maxLength={200}
+                    onChange={(event) => setBuildingOwner(event.target.value)}
+                    value={buildingOwner}
+                  />
+                </div>
+                <div className="col-12">
+                  <label className="form-label" htmlFor="project-description">
+                    Beschreibung
+                  </label>
+                  <textarea
+                    className="form-control"
+                    id="project-description"
+                    maxLength={2000}
+                    onChange={(event) => setDescription(event.target.value)}
+                    rows={4}
+                    value={description}
+                  />
+                </div>
+                <div className="col-12 col-md-6">
+                  <label className="form-label" htmlFor="single-phase-voltage">
+                    Standardspannung 1-phasig [V]
+                  </label>
+                  <input
+                    className="form-control"
+                    id="single-phase-voltage"
+                    min="1"
+                    onChange={(event) =>
+                      setSinglePhaseVoltageV(event.target.value)
+                    }
+                    required
+                    type="number"
+                    value={singlePhaseVoltageV}
+                  />
+                </div>
+                <div className="col-12 col-md-6">
+                  <label className="form-label" htmlFor="three-phase-voltage">
+                    Standardspannung 3-phasig [V]
+                  </label>
+                  <input
+                    className="form-control"
+                    id="three-phase-voltage"
+                    min="1"
+                    onChange={(event) =>
+                      setThreePhaseVoltageV(event.target.value)
+                    }
+                    required
+                    type="number"
+                    value={threePhaseVoltageV}
+                  />
+                </div>
+              </div>
+            </div>
+            <div className="modal-footer">
+              <button
+                className="btn btn-outline-secondary"
+                disabled={isSaving}
+                onClick={onClose}
+                type="button"
+              >
+                Abbrechen
+              </button>
+              <button
+                className="btn btn-primary"
+                disabled={isSaving || !isValid}
+                type="submit"
+              >
+                {isSaving ? "Wird gespeichert …" : "Einstellungen speichern"}
+              </button>
+            </div>
+          </form>
+        </div>
+      </div>
+      <div className="modal-backdrop fade show" />
+    </>
+  );
+}
+
+function toNullableString(value: string) {
+  return value.trim() || null;
+}
diff --git a/src/frontend/types.ts b/src/frontend/types.ts
index 0eac099..f6c7be9 100644
--- a/src/frontend/types.ts
+++ b/src/frontend/types.ts
@@ -1,6 +1,10 @@
 export interface ProjectDto {
   id: string;
   name: string;
+  internalProjectNumber: string | null;
+  externalProjectNumber: string | null;
+  buildingOwner: string | null;
+  description: string | null;
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
   currentRevision: number;
diff --git a/src/frontend/utils/api.ts b/src/frontend/utils/api.ts
index a3622aa..5439067 100644
--- a/src/frontend/utils/api.ts
+++ b/src/frontend/utils/api.ts
@@ -210,7 +210,15 @@ export function createProject(name: string) {
 export function updateProjectSettings(
   projectId: string,
   expectedRevision: number,
-  input: { singlePhaseVoltageV: number; threePhaseVoltageV: number }
+  input: {
+    name: string;
+    internalProjectNumber: string | null;
+    externalProjectNumber: string | null;
+    buildingOwner: string | null;
+    description: string | null;
+    singlePhaseVoltageV: number;
+    threePhaseVoltageV: number;
+  }
 ) {
   return request<ProjectSettingsCommandResultDto>(
     `/api/projects/${projectId}`,
diff --git a/src/shared/validation/project-structure.schemas.ts b/src/shared/validation/project-structure.schemas.ts
index 8cf20a9..3872f4c 100644
--- a/src/shared/validation/project-structure.schemas.ts
+++ b/src/shared/validation/project-structure.schemas.ts
@@ -2,7 +2,11 @@ import { z } from "zod";
 import { expectedProjectRevisionSchema } from "./project-command.schemas.js";
 
 export const createProjectSchema = z.object({
-  name: z.string().min(1),
+  name: z.string().trim().min(1).max(200),
+  internalProjectNumber: z.string().trim().max(100).optional(),
+  externalProjectNumber: z.string().trim().max(100).optional(),
+  buildingOwner: z.string().trim().max(200).optional(),
+  description: z.string().trim().max(2000).optional(),
   singlePhaseVoltageV: z.number().positive().optional(),
   threePhaseVoltageV: z.number().positive().optional(),
 });
@@ -10,6 +14,11 @@ export const createProjectSchema = z.object({
 export const updateProjectSettingsSchema = z
   .object({
     expectedRevision: expectedProjectRevisionSchema,
+    name: z.string().trim().min(1).max(200),
+    internalProjectNumber: z.string().trim().max(100).nullable(),
+    externalProjectNumber: z.string().trim().max(100).nullable(),
+    buildingOwner: z.string().trim().max(200).nullable(),
+    description: z.string().trim().max(2000).nullable(),
     singlePhaseVoltageV: z.number().positive(),
     threePhaseVoltageV: z.number().positive(),
   })
diff --git a/tests/project-command.service.test.ts b/tests/project-command.service.test.ts
index fc7802a..e0a3126 100644
--- a/tests/project-command.service.test.ts
+++ b/tests/project-command.service.test.ts
@@ -951,6 +951,11 @@ describe("project command service", () => {
         projectId: "project-1",
         expectedRevision: 0,
         command: createProjectSettingsUpdateProjectCommand({
+          name: "Test project",
+          internalProjectNumber: null,
+          externalProjectNumber: null,
+          buildingOwner: null,
+          description: null,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
         }),
diff --git a/tests/project-settings-project-command.repository.test.ts b/tests/project-settings-project-command.repository.test.ts
index dbccad8..821f766 100644
--- a/tests/project-settings-project-command.repository.test.ts
+++ b/tests/project-settings-project-command.repository.test.ts
@@ -25,6 +25,7 @@ function createTestDatabase(): DatabaseContext {
     .values({
       id: "project-1",
       name: "Testprojekt",
+      internalProjectNumber: "INT-1",
       singlePhaseVoltageV: 230,
       threePhaseVoltageV: 400,
     })
@@ -35,6 +36,11 @@ function createTestDatabase(): DatabaseContext {
 function getSettings(context: DatabaseContext) {
   return context.db
     .select({
+      name: projects.name,
+      internalProjectNumber: projects.internalProjectNumber,
+      externalProjectNumber: projects.externalProjectNumber,
+      buildingOwner: projects.buildingOwner,
+      description: projects.description,
       singlePhaseVoltageV: projects.singlePhaseVoltageV,
       threePhaseVoltageV: projects.threePhaseVoltageV,
       currentRevision: projects.currentRevision,
@@ -44,15 +50,32 @@ function getSettings(context: DatabaseContext) {
     .get();
 }
 
+function settings(
+  overrides: Partial<Parameters<
+    typeof createProjectSettingsUpdateProjectCommand
+  >[0]> = {}
+) {
+  return {
+    name: "Testprojekt",
+    internalProjectNumber: "INT-1",
+    externalProjectNumber: null,
+    buildingOwner: null,
+    description: null,
+    singlePhaseVoltageV: 230,
+    threePhaseVoltageV: 400,
+    ...overrides,
+  };
+}
+
 describe("project settings project-command repository", () => {
   it("validates settings commands and sends the expected revision from the frontend", async () => {
     assert.throws(
       () =>
         createProjectSettingsUpdateProjectCommand({
+          ...settings(),
           singlePhaseVoltageV: 0,
-          threePhaseVoltageV: 400,
         }),
-      /invalid voltages/
+      /invalid values/
     );
     const requests: Array<{ url: string; body: unknown }> = [];
     const originalFetch = globalThis.fetch;
@@ -68,6 +91,7 @@ describe("project settings project-command repository", () => {
     };
     try {
       await updateProjectSettings("project-1", 7, {
+        ...settings(),
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
       });
@@ -79,6 +103,11 @@ describe("project settings project-command repository", () => {
         url: "/api/projects/project-1",
         body: {
           expectedRevision: 7,
+          name: "Testprojekt",
+          internalProjectNumber: "INT-1",
+          externalProjectNumber: null,
+          buildingOwner: null,
+          description: null,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
         },
@@ -94,6 +123,9 @@ describe("project settings project-command repository", () => {
       );
       const history = new ProjectHistoryRepository(context.db);
       const command = createProjectSettingsUpdateProjectCommand({
+        ...settings(),
+        name: "Neuer Projektname",
+        buildingOwner: "Beispiel Bau GmbH",
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
       });
@@ -104,11 +136,21 @@ describe("project settings project-command repository", () => {
         command,
       });
       assert.deepEqual(getSettings(context), {
+        name: "Neuer Projektname",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: "Beispiel Bau GmbH",
+        description: null,
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
         currentRevision: 1,
       });
       assert.deepEqual(forward.inverse.payload, {
+        name: "Testprojekt",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: null,
+        description: null,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
       });
@@ -123,6 +165,11 @@ describe("project settings project-command repository", () => {
         command: forward.inverse,
       });
       assert.deepEqual(getSettings(context), {
+        name: "Testprojekt",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: null,
+        description: null,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
         currentRevision: 2,
@@ -138,6 +185,11 @@ describe("project settings project-command repository", () => {
         command,
       });
       assert.deepEqual(getSettings(context), {
+        name: "Neuer Projektname",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: "Beispiel Bau GmbH",
+        description: null,
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
         currentRevision: 3,
@@ -147,6 +199,37 @@ describe("project settings project-command repository", () => {
     }
   });
 
+  it("applies persisted version-one voltage commands without clearing metadata", () => {
+    const context = createTestDatabase();
+    try {
+      const repository = new ProjectSettingsProjectCommandRepository(
+        context.db
+      );
+      repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: {
+          schemaVersion: 1,
+          type: "project.update-settings",
+          payload: {
+            singlePhaseVoltageV: 240,
+            threePhaseVoltageV: 415,
+          },
+        },
+      });
+      assert.deepEqual(getSettings(context), {
+        ...settings({
+          singlePhaseVoltageV: 240,
+          threePhaseVoltageV: 415,
+        }),
+        currentRevision: 1,
+      });
+    } finally {
+      context.close();
+    }
+  });
+
   it("rejects no-op, invalid project and stale revision without partial writes", () => {
     const context = createTestDatabase();
     try {
@@ -160,8 +243,7 @@ describe("project settings project-command repository", () => {
             expectedRevision: 0,
             source: "user",
             command: createProjectSettingsUpdateProjectCommand({
-              singlePhaseVoltageV: 230,
-              threePhaseVoltageV: 400,
+              ...settings(),
             }),
           }),
         /did not change/
@@ -173,6 +255,7 @@ describe("project settings project-command repository", () => {
             expectedRevision: 0,
             source: "user",
             command: createProjectSettingsUpdateProjectCommand({
+              ...settings(),
               singlePhaseVoltageV: 240,
               threePhaseVoltageV: 415,
             }),
@@ -186,6 +269,7 @@ describe("project settings project-command repository", () => {
             expectedRevision: 1,
             source: "user",
             command: createProjectSettingsUpdateProjectCommand({
+              ...settings(),
               singlePhaseVoltageV: 240,
               threePhaseVoltageV: 415,
             }),
@@ -193,6 +277,11 @@ describe("project settings project-command repository", () => {
         ProjectRevisionConflictError
       );
       assert.deepEqual(getSettings(context), {
+        name: "Testprojekt",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: null,
+        description: null,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
         currentRevision: 0,
@@ -226,6 +315,7 @@ describe("project settings project-command repository", () => {
             expectedRevision: 0,
             source: "user",
             command: createProjectSettingsUpdateProjectCommand({
+              ...settings(),
               singlePhaseVoltageV: 240,
               threePhaseVoltageV: 415,
             }),
@@ -233,6 +323,11 @@ describe("project settings project-command repository", () => {
         /forced project settings history failure/
       );
       assert.deepEqual(getSettings(context), {
+        name: "Testprojekt",
+        internalProjectNumber: "INT-1",
+        externalProjectNumber: null,
+        buildingOwner: null,
+        description: null,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
         currentRevision: 0,
diff --git a/tests/project-snapshot.repository.test.ts b/tests/project-snapshot.repository.test.ts
index 8936e77..ee480f0 100644
--- a/tests/project-snapshot.repository.test.ts
+++ b/tests/project-snapshot.repository.test.ts
@@ -20,6 +20,7 @@ import { projectSnapshots } from "../src/db/schema/project-snapshots.js";
 import { projects } from "../src/db/schema/projects.js";
 import { rooms } from "../src/db/schema/rooms.js";
 import { deserializeProjectStateSnapshot } from "../src/domain/models/project-state-snapshot.model.js";
+import { projectStateSnapshotSchemaVersion } from "../src/domain/models/project-state-snapshot.model.js";
 import { ProjectRevisionConflictError } from "../src/domain/errors/project-revision-conflict.error.js";
 import { ProjectSnapshotNameConflictError } from "../src/domain/errors/project-snapshot-name-conflict.error.js";
 
@@ -133,7 +134,7 @@ describe("project snapshot repository", () => {
       });
       assert.ok(created);
       assert.equal(created.sourceRevision, 0);
-      assert.equal(created.schemaVersion, 1);
+      assert.equal(created.schemaVersion, projectStateSnapshotSchemaVersion);
       assert.equal(created.name, "Vor Ausschreibung");
       assert.equal(created.description, "Sicherer Stand");
       assert.equal(created.createdByActorId, "planner-1");
@@ -262,6 +263,42 @@ describe("project snapshot repository", () => {
         prepared.command.payload.targetState.project.id,
         "project-1"
       );
+      const currentPayload = JSON.parse(
+        context.db
+          .select({ payloadJson: projectSnapshots.payloadJson })
+          .from(projectSnapshots)
+          .where(eq(projectSnapshots.id, snapshot.id))
+          .get()!.payloadJson
+      ) as Record<string, unknown> & {
+        project: Record<string, unknown>;
+      };
+      currentPayload.schemaVersion = 1;
+      delete currentPayload.project.internalProjectNumber;
+      delete currentPayload.project.externalProjectNumber;
+      delete currentPayload.project.buildingOwner;
+      delete currentPayload.project.description;
+      const legacyPayloadJson = JSON.stringify(currentPayload);
+      context.db
+        .update(projectSnapshots)
+        .set({
+          schemaVersion: 1,
+          payloadJson: legacyPayloadJson,
+          payloadSha256: crypto
+            .createHash("sha256")
+            .update(legacyPayloadJson)
+            .digest("hex"),
+        })
+        .where(eq(projectSnapshots.id, snapshot.id))
+        .run();
+      const legacyPrepared = repository.prepareRestore(
+        "project-1",
+        snapshot.id
+      );
+      assert.ok(legacyPrepared);
+      assert.equal(
+        legacyPrepared.command.payload.targetState.project.buildingOwner,
+        null
+      );
       context.db
         .update(projectSnapshots)
         .set({ payloadJson: `${JSON.stringify({})}\n` })
diff --git a/tests/project-state-snapshot.test.ts b/tests/project-state-snapshot.test.ts
index 0ff636a..22b2e7d 100644
--- a/tests/project-state-snapshot.test.ts
+++ b/tests/project-state-snapshot.test.ts
@@ -3,16 +3,21 @@ import { describe, it } from "node:test";
 import {
   deserializeProjectStateSnapshot,
   parseProjectStateSnapshot,
+  projectStateSnapshotSchemaVersion,
   serializeProjectStateSnapshot,
 } from "../src/domain/models/project-state-snapshot.model.js";
 import { createNamedProjectSnapshotSchema } from "../src/shared/validation/project-snapshot.schemas.js";
 
 function minimalSnapshot() {
   return {
-    schemaVersion: 1 as const,
+    schemaVersion: projectStateSnapshotSchemaVersion,
     project: {
       id: "project-1",
       name: "Projekt",
+      internalProjectNumber: "INT-1",
+      externalProjectNumber: null,
+      buildingOwner: null,
+      description: null,
       singlePhaseVoltageV: 230,
       threePhaseVoltageV: 400,
     },
@@ -37,6 +42,28 @@ describe("project state snapshot model", () => {
     );
   });
 
+  it("upgrades version-one snapshots with empty project metadata", () => {
+    const legacy = {
+      ...minimalSnapshot(),
+      schemaVersion: 1 as const,
+      project: {
+        id: "project-1",
+        name: "Altprojekt",
+        singlePhaseVoltageV: 230,
+        threePhaseVoltageV: 400,
+      },
+    };
+    const snapshot = parseProjectStateSnapshot(legacy);
+    assert.equal(snapshot.schemaVersion, projectStateSnapshotSchemaVersion);
+    assert.deepEqual(snapshot.project, {
+      ...legacy.project,
+      internalProjectNumber: null,
+      externalProjectNumber: null,
+      buildingOwner: null,
+      description: null,
+    });
+  });
+
   it("rejects duplicate ids and cross-project ownership", () => {
     assert.throws(
       () =>