Add public building project setting

AGENTS.md

@@ -250,9 +250,11 @@ not change the project revision or undo/redo stacks. Restoring a server-stored
 snapshot verifies its checksum and the current-state hash, replaces supported
 project data atomically and records a new `restore` revision with a complete
 inverse command. Restore can therefore be undone and redone after a restart.
-Baseline snapshot schema version 1 contains circuit-group identity,
+Current snapshot schema version 2 additionally stores whether the project is a
-distribution-board components and the separate circuit/component protection
+public building. Supported baseline version 1 snapshots are upgraded with
-records. Pre-baseline snapshots are unsupported. Portable duplicate imports
+`isPublicBuilding = false`; pre-baseline snapshots remain unsupported. Both
+versions contain circuit-group identity, distribution-board components and the
+separate circuit/component protection records. Portable duplicate imports
 remap component ids and protection-owner references together with the existing
 project graph.
 The central revision boundary creates an automatic logical snapshot after each
@@ -284,9 +286,11 @@ global-to-project copy API/UI paths use these persistent commands and track the
 returned project revision. ProjectDevice synchronization/disconnect API and UI
 paths do the same; their undo action uses the project-wide history endpoint.
 Project settings use the persistent `project.update-settings` command. Project
-metadata, both voltage defaults and the enabled distribution-board supply types
+metadata, the public-building classification, both voltage defaults and the
-change in one revision and Undo/Redo restores them together; the project PUT
+enabled distribution-board supply types change in one revision and Undo/Redo
-route requires `expectedRevision`. The system catalog is `AV`, `SV`, `EV`,
+restores them together; the project PUT route requires `expectedRevision`.
+The public-building flag is the future sizing input for requiring halogen-free
+cables and lines. The system catalog is `AV`, `SV`, `EV`,
 `USV`, `MSR`, `SiBe`; at least one must be enabled and a type used by a board
 cannot be disabled.
 Distribution-board setup uses `distribution-board.insert` schema version 1

README.md

@@ -108,9 +108,10 @@ npm run db:generate
 ```
 
 `db:backup` verwendet die SQLite-Online-Backup-API und prüft das Ergebnis auf
-Integrität und Fremdschlüsselverletzungen. Die Migration `0000` ist die
+Integrität und Fremdschlüsselverletzungen. Migration `0000` ist die
-Release-Baseline und richtet ausschließlich eine neue, leere Datenbank ein.
+Release-Baseline für eine leere Datenbank; nachfolgende nummerierte Migrationen
-Datenbanken aus Entwicklungsständen vor dieser Baseline werden nicht unterstützt.
+entwickeln diese Baseline additiv weiter. Datenbanken aus Entwicklungsständen
+vor der Baseline werden nicht unterstützt.
 
 ## Dokumentation
 

docs/circuit-list-editor-api.md

@@ -73,9 +73,11 @@ Protected-board structure uses
 `circuit-protection.update`. A subtree restore is normally emitted only as the
 persisted inverse of a delete. The dispatcher also supports the documented
 project-device, project settings, distribution-board and project-location
-commands. The generic editor commands listed here use schema version `1`;
+commands. The generic editor commands listed here use schema version `1`.
-the clean pre-release baseline does not accept older development formats.
+`project.update-settings` uses version `2` and still accepts supported baseline
-Unsupported types or schema versions are rejected. Insert commands contain the complete entity or circuit block
+version `1` commands without changing the newer building classification.
+Pre-baseline formats remain unsupported. Unsupported types or schema versions
+are rejected. Insert commands contain the complete entity or circuit block
 with stable ids; delete commands include the expected parent identity. Circuit
 snapshots contain zero, one or multiple complete device rows. Move commands
 contain each row's expected and target circuit plus its exact expected and
@@ -170,12 +172,12 @@ synchronizes linked circuit rows implicitly.
 
 - `PUT /projects/:projectId`
   - request:
-    `{ "expectedRevision": 12, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
+    `{ "expectedRevision": 12, "isPublicBuilding": true, "singlePhaseVoltageV": 230, "threePhaseVoltageV": 400, "enabledDistributionBoardSupplyTypes": ["AV", "MSR", "SiBe"], ...projectMetadata }`
   - executes `project.update-settings` as one atomic revision
   - response:
     `{ "project": { ... }, "revision": { ... }, "history": { ... } }`
-  - persistent Undo/Redo restores metadata, voltage values and the enabled
+  - persistent Undo/Redo restores metadata, the public-building flag, voltage
-    distribution-board supply types together; project-device and circuit
+    values and enabled distribution-board supply types together; project-device and circuit
     voltages are recalculated from the restored project settings in the same
     transaction
   - project-device and circuit voltage are derived values and are not accepted

docs/current-architecture.md

@@ -232,8 +232,10 @@ und Historienstapel teilen dieselbe Transaktion. Create, Import aus der globalen
 Gerätebibliothek und Delete laufen über dieselbe Command-Grenze; ihre Antworten
 liefern Gerät und aktualisierten Historienstand an die Projektseite zurück.
 `project.update-settings` versioniert Projektname, interne und externe
-Projektnummer, Bauherr, Beschreibung, beide Standardspannungen sowie die im
+Projektnummer, Bauherr, Beschreibung, die Kennzeichnung als öffentliches
-Projekt freigeschalteten Verteiler-Netzarten als eine atomare Änderung. Der
+Gebäude, beide Standardspannungen sowie die im Projekt freigeschalteten
+Verteiler-Netzarten als eine atomare Änderung. Die Gebäudekennzeichnung ist
+der spätere Eingang für die Auswahl halogenfreier Kabel und Leitungen. Der
 Systemkatalog besteht aus `AV`, `SV`, `EV`, `USV`, `MSR` und `SiBe`; mindestens
 eine Netzart muss aktiv bleiben und eine bereits von einer Verteilung
 verwendete Netzart kann nicht deaktiviert werden. Die Projektseite bearbeitet diese Angaben in einem
@@ -414,12 +416,13 @@ wieder her.
 verteilerweiten Gleichzeitigkeitsfaktor gemeinsam und stellt alle Werte über
 dauerhaftes Undo/Redo wieder her. Der Faktor liegt zwischen `0` und `1` und
 ist für bestehende sowie neu angelegte Verteilungen standardmäßig `1`.
-Das aktuelle Baseline-Snapshot-Schema enthält den Gleichzeitigkeitsfaktor,
+Snapshot-Schema 2 enthält zusätzlich die Gebäudekennzeichnung sowie den Gleichzeitigkeitsfaktor,
 Gruppenkategorie und -nummer, Verteilerkomponenten sowie die getrennten
 1:1-Schutzgerätedaten. Capture,
 benannte und automatische Snapshots, Wiederherstellung, Undo/Redo und beide
-JSON-Importmodi verwenden denselben vollständigen Zustand. Vorherige
+JSON-Importmodi verwenden denselben vollständigen Zustand. Die unterstützte
-Entwicklungsschemas werden nicht mehr eingelesen.
+Baseline-Version 1 wird mit `isPublicBuilding = false` hochgestuft; Formate vor
+dieser Baseline werden nicht eingelesen.
 Persistente Insert-, Update- und Delete-Commands versionieren Anlage,
 Bearbeitung und Löschung von Geschossen und Räumen mit stabilen UUIDs und
 exakten Vorher-/Nachher-Snapshots. Ein Geschoss wird nur
@@ -447,8 +450,8 @@ Kopieren in ein Projekt erzeugt ein eigenständiges Projektgerät.
 
 - SQLite ist die aktuell unterstützte Datenbank.
 - Fremdschlüssel werden für jeden Datenbankkontext aktiviert.
-- `npm run db:migrate` richtet mit der einzelnen Migration `0000` das komplette
+- `npm run db:migrate` richtet mit Baseline-Migration `0000` und den folgenden
-  aktuelle Schema einer leeren Datenbank ein.
+  additiven Migrationen das aktuelle Schema ein.
 - `npm run db:verify:circuit-schema` prüft erforderliche und entfernte Spalten.
 - `npm run db:backup` erzeugt ein konsistentes und verifiziertes Online-Backup.
 - `npm run typecheck:scripts` prüft die TypeScript-Wartungsskripte, ohne Code zu
@@ -469,8 +472,8 @@ Kopieren in ein Projekt erzeugt ein eigenständiges Projektgerät.
   flachen Stromkreis-Schutzfelder sind aus der Baseline entfernt.
   Ein triggergeführtes Register erzwingt bereits eine normalisierte,
   stromkreislistenweite BMK-Eindeutigkeit über Stromkreise und
-  Verteilerkomponenten. Snapshot- und Transfer-Integration verwenden
+  Verteilerkomponenten. Snapshot- und Transfer-Integration verwenden aktuell
-  Snapshot-Schema 1 der Baseline. Persistente Insert/Delete/Update-Commands für
+  Snapshot-Schema 2. Persistente Insert/Delete/Update-Commands für
   veränderliche Verteilerkomponenten, Gruppen einschließlich befüllter
   Unterbäume sowie vollständige Gruppensortierung sind integriert. Der Editor
   zeigt die geschützte Struktur an und bearbeitet veränderliche Gruppen- und

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

@@ -262,8 +262,9 @@ Completed foundation:
 - `project-device.insert` and `project-device.delete` preserve stable device
   ids; delete undo restores links only from complete unchanged disconnected-row
   snapshots in the same transaction
-- `project.update-settings` persists both project voltage defaults, its exact
+- `project.update-settings` persists the public-building classification and
-  inverse, revision and history transition atomically; the project page and
+  both project voltage defaults with their exact inverse, revision and history
+  transition atomically; the project page and
   existing PUT route require the current expected revision; the same
   transaction derives every project-device and circuit voltage again, so
   Undo/Redo cannot leave mixed voltage states

docs/revit-requirements-llm-context.md

@@ -52,7 +52,7 @@ Wichtige fachliche Grenzen:
 Für einen späteren Revit-Austausch besonders relevante Daten sind:
 
 - Projekt: Name, interne/externe Projektnummer, Bauherr, Beschreibung,
-  Projektspannungen.
+  Kennzeichnung als öffentliches Gebäude und Projektspannungen.
 - Geschoss und Raum: interne UUID, Name beziehungsweise Raumnummer und
   Raumname.
 - Verteilung: interne UUID, Name, Etage, Netzart und Gleichzeitigkeitsfaktor.

docs/spec/06-future-sizing-and-calculations.md

@@ -14,12 +14,18 @@ Future suggestions or checks may include:
 - cable type
 - number of cores
 - cable cross-section
+- halogen-free cable or line requirement for public buildings
 - minimum cable cross-section based on current
 - maximum permissible cable length based on voltage drop
 - warning messages if cable length, cross-section or protection device do not match
 
 Users must remain able to manually override suggestions.
 
+The project-owned `isPublicBuilding` setting is the authoritative input for
+the later halogen-free selection rule. The setting is persisted now; this
+document does not yet define or implement the complete cable catalog or sizing
+algorithm.
+
 ## Initial Design Rule Examples
 
 These are common planning defaults, not a replacement for full norm-compliant calculation.

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

@@ -465,9 +465,9 @@ Implemented foundation:
 - ProjectDevice synchronization and disconnect endpoints also require
   `expectedRevision`; their UI undo uses project-wide persistent history and
   the obsolete direct restore/reconnect write paths are removed
-- project voltage settings use `project.update-settings`; both values, inverse,
+- project settings use `project.update-settings`; metadata, public-building
-  revision and history transition commit atomically and the former direct
+  classification, voltage values, inverse, revision and history transition
-  settings write is removed
+  commit atomically and the former direct settings write is removed
 - distribution-board setup uses `distribution-board.insert` with a complete
   stable board/list/default-section snapshot; Undo removes only an unchanged
   empty setup and the former direct controller write is removed

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

@@ -54,7 +54,7 @@ requirements and intended sequencing, not proof of implementation.
 
 The pre-release cleanup established the following compatibility boundary:
 
-- [x] Pre-release databases, portable JSON exports, logical snapshots and
+- [x] Pre-baseline databases, portable JSON exports, logical snapshots and
   persisted command histories are explicitly unsupported.
 - [x] Migration `0000` builds the complete supported schema on an empty
   database.
@@ -109,9 +109,16 @@ The pre-release cleanup established the following compatibility boundary:
   device rows with a valid phase are three-phase.
 - [x] Changing project voltage settings updates all project devices and circuits
   atomically in the same persistent Undo/Redo step.
-- [x] Baseline migration `0000` and project-state schema version `1` store only
+- [x] Baseline migration `0000` stores only canonical derived values.
-  the canonical derived values. Pre-release imports are intentionally
+  Pre-baseline imports are intentionally unsupported.
-  unsupported.
+
+## Building Classification
+
+- [x] Store whether a project represents a public building.
+- [x] Edit the value in the project settings and preserve it through persistent
+  Undo/Redo, snapshots and portable project transfers.
+- [x] Provide the value as an explicit future sizing input for selecting
+  halogen-free cables and lines; automatic sizing remains deferred.
 
 ## Circuit List Power Summary
 

docs/spec/09-distribution-board-components-and-protection-groups.md

@@ -467,11 +467,11 @@ The supported logical project snapshot and portable JSON transfer must include:
 - circuit protection-device state
 - all new component relationships and sort positions
 
-The clean pre-release baseline uses project-state schema version `1`. It
+Current project-state schema version `2` contains the complete supported
-contains the complete supported structure above and is shared by logical
+structure above and the project building classification. It is shared by
-snapshots, restore, Undo/Redo and portable JSON transfer. Payloads from earlier
+logical snapshots, restore, Undo/Redo and portable JSON transfer. Supported
-development schemas are intentionally unsupported and rejected before any
+baseline version `1` is upgraded with the non-public default; payloads from
-write.
+before that baseline are rejected before any write.
 
 Migration `0000` creates the complete relational model on an empty database.
 New defaults apply when boards, groups or circuits are created; they never
@@ -545,7 +545,7 @@ Implemented persistence:
   one-to-one ownership boundaries
 - a trigger-maintained circuit-list registry rejects normalized BMK collisions
   across circuits and distribution-board components
-- snapshot schema version `1` includes group identity, distribution-board
+- snapshot schema version `2` includes group identity, distribution-board
   components and both one-to-one protection collections
 - capture, named and automatic snapshots, restore, Undo/Redo and portable JSON
   transfers preserve the complete new relational state

scripts/db-verify-circuit-schema.js

@@ -78,6 +78,7 @@ const requiredProjectColumns = [
   "external_project_number",
   "building_owner",
   "description",
+  "is_public_building",
   "enabled_distribution_board_supply_types",
 ];
 const projectColumns = new Set(

src/db/migrations/0001_add_public_building_setting.sql

@@ -0,0 +1 @@
+ALTER TABLE `projects` ADD `is_public_building` integer DEFAULT false NOT NULL;

src/db/migrations/meta/_journal.json

@@ -8,6 +8,13 @@
       "when": 1785499119431,
       "tag": "0000_whole_surge",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "6",
+      "when": 1785511894897,
+      "tag": "0001_add_public_building_setting",
+      "breakpoints": true
     }
   ]
 }

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

@@ -40,22 +40,33 @@ export class ProjectSettingsProjectCommandRepository
     if (!current) {
       throw new Error("Project not found.");
     }
-    const target = input.command.payload;
+    const target: ProjectSettingsValues =
+      input.command.schemaVersion === 1
+        ? {
+            ...input.command.payload,
+            isPublicBuilding: current.isPublicBuilding,
+          }
+        : input.command.payload;
     if (projectSettingsEqual(current, target)) {
       throw new Error("Project settings did not change.");
     }
 
-    const inverse = createProjectSettingsUpdateProjectCommand({
+    const inverseValues: ProjectSettingsValues = {
       name: current.name,
       internalProjectNumber: current.internalProjectNumber,
       externalProjectNumber: current.externalProjectNumber,
       buildingOwner: current.buildingOwner,
       description: current.description,
+      isPublicBuilding: current.isPublicBuilding,
       singlePhaseVoltageV: current.singlePhaseVoltageV,
       threePhaseVoltageV: current.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
         current.enabledDistributionBoardSupplyTypes,
-    });
+    };
+    const inverse =
+      input.command.schemaVersion === 1
+        ? createBaselineProjectSettingsUpdateCommand(inverseValues)
+        : createProjectSettingsUpdateProjectCommand(inverseValues);
     assertDisabledSupplyTypesAreUnused(tx, input.projectId, target);
     const updated = tx
       .update(projects)
@@ -71,6 +82,26 @@ export class ProjectSettingsProjectCommandRepository
   }
 }
 
+function createBaselineProjectSettingsUpdateCommand(
+  values: ProjectSettingsValues
+) {
+  return {
+    schemaVersion: 1 as const,
+    type: "project.update-settings" as const,
+    payload: {
+      name: values.name,
+      internalProjectNumber: values.internalProjectNumber,
+      externalProjectNumber: values.externalProjectNumber,
+      buildingOwner: values.buildingOwner,
+      description: values.description,
+      singlePhaseVoltageV: values.singlePhaseVoltageV,
+      threePhaseVoltageV: values.threePhaseVoltageV,
+      enabledDistributionBoardSupplyTypes:
+        values.enabledDistributionBoardSupplyTypes,
+    },
+  };
+}
+
 function projectSettingsEqual(
   current: ProjectSettingsValues,
   target: ProjectSettingsValues
@@ -81,6 +112,7 @@ function projectSettingsEqual(
     current.externalProjectNumber === target.externalProjectNumber &&
     current.buildingOwner === target.buildingOwner &&
     current.description === target.description &&
+    current.isPublicBuilding === target.isPublicBuilding &&
     current.singlePhaseVoltageV === target.singlePhaseVoltageV &&
     current.threePhaseVoltageV === target.threePhaseVoltageV
     && sameSupplyTypes(

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

@@ -208,6 +208,7 @@ function replaceProjectState(
       externalProjectNumber: state.project.externalProjectNumber,
       buildingOwner: state.project.buildingOwner,
       description: state.project.description,
+      isPublicBuilding: state.project.isPublicBuilding,
       singlePhaseVoltageV: state.project.singlePhaseVoltageV,
       threePhaseVoltageV: state.project.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:

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

@@ -39,6 +39,7 @@ export function readProjectStateSnapshot(
       externalProjectNumber: projects.externalProjectNumber,
       buildingOwner: projects.buildingOwner,
       description: projects.description,
+      isPublicBuilding: projects.isPublicBuilding,
       singlePhaseVoltageV: projects.singlePhaseVoltageV,
       threePhaseVoltageV: projects.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
@@ -233,6 +234,7 @@ export function readProjectStateSnapshot(
       externalProjectNumber: project.externalProjectNumber,
       buildingOwner: project.buildingOwner,
       description: project.description,
+      isPublicBuilding: project.isPublicBuilding,
       singlePhaseVoltageV: project.singlePhaseVoltageV,
       threePhaseVoltageV: project.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:

src/db/repositories/project.repository.ts

@@ -25,6 +25,7 @@ export class ProjectRepository {
       externalProjectNumber: input.externalProjectNumber ?? null,
       buildingOwner: input.buildingOwner ?? null,
       description: input.description ?? null,
+      isPublicBuilding: input.isPublicBuilding ?? false,
       singlePhaseVoltageV: input.singlePhaseVoltageV ?? 230,
       threePhaseVoltageV: input.threePhaseVoltageV ?? 400,
       enabledDistributionBoardSupplyTypes: [

src/db/schema/projects.ts

@@ -9,6 +9,9 @@ export const projects = sqliteTable("projects", {
   externalProjectNumber: text("external_project_number"),
   buildingOwner: text("building_owner"),
   description: text("description"),
+  isPublicBuilding: integer("is_public_building", { mode: "boolean" })
+    .notNull()
+    .default(false),
   singlePhaseVoltageV: integer("single_phase_voltage_v").notNull().default(230),
   threePhaseVoltageV: integer("three_phase_voltage_v").notNull().default(400),
   enabledDistributionBoardSupplyTypes: text(

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

@@ -6,7 +6,8 @@ import {
 
 export const projectSettingsUpdateCommandType =
   "project.update-settings" as const;
-export const projectSettingsUpdateCommandSchemaVersion = 1 as const;
+export const projectSettingsUpdateCommandSchemaVersion = 2 as const;
+const previousProjectSettingsUpdateCommandSchemaVersion = 1 as const;
 
 export interface ProjectSettingsValues {
   name: string;
@@ -14,21 +15,37 @@ export interface ProjectSettingsValues {
   externalProjectNumber: string | null;
   buildingOwner: string | null;
   description: string | null;
+  isPublicBuilding: boolean;
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
 }
 
-export interface ProjectSettingsUpdateProjectCommand
+type PreviousProjectSettingsValues = Omit<
+  ProjectSettingsValues,
+  "isPublicBuilding"
+>;
+
+export interface CurrentProjectSettingsUpdateProjectCommand
   extends SerializedProjectCommand<ProjectSettingsValues> {
   schemaVersion: typeof projectSettingsUpdateCommandSchemaVersion;
   type: typeof projectSettingsUpdateCommandType;
 }
 
+interface PreviousProjectSettingsUpdateProjectCommand
+  extends SerializedProjectCommand<PreviousProjectSettingsValues> {
+  schemaVersion: typeof previousProjectSettingsUpdateCommandSchemaVersion;
+  type: typeof projectSettingsUpdateCommandType;
+}
+
+export type ProjectSettingsUpdateProjectCommand =
+  | CurrentProjectSettingsUpdateProjectCommand
+  | PreviousProjectSettingsUpdateProjectCommand;
+
 export function createProjectSettingsUpdateProjectCommand(
   values: ProjectSettingsValues
-): ProjectSettingsUpdateProjectCommand {
+): CurrentProjectSettingsUpdateProjectCommand {
-  const command: ProjectSettingsUpdateProjectCommand = {
+  const command: CurrentProjectSettingsUpdateProjectCommand = {
     schemaVersion: projectSettingsUpdateCommandSchemaVersion,
     type: projectSettingsUpdateCommandType,
     payload: { ...values },
@@ -42,7 +59,8 @@ export function assertProjectSettingsUpdateProjectCommand(
 ): asserts command is ProjectSettingsUpdateProjectCommand {
   if (
     command.type !== projectSettingsUpdateCommandType ||
-    command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion
+    (command.schemaVersion !== projectSettingsUpdateCommandSchemaVersion &&
+      command.schemaVersion !== previousProjectSettingsUpdateCommandSchemaVersion)
   ) {
     throw new Error("Unsupported project settings update command.");
   }
@@ -58,8 +76,7 @@ export function assertProjectSettingsUpdateProjectCommand(
     !isNullableTrimmedString(command.payload.buildingOwner, 200) ||
     !isNullableTrimmedString(command.payload.description, 2000) ||
     !isPositiveFiniteNumber(command.payload.singlePhaseVoltageV) ||
-    !isPositiveFiniteNumber(command.payload.threePhaseVoltageV) ||
+    !isPositiveFiniteNumber(command.payload.threePhaseVoltageV)
-    Object.keys(command.payload).length !== 8
   ) {
     throw new Error(
       "Project settings update command contains invalid values."
@@ -74,6 +91,18 @@ export function assertProjectSettingsUpdateProjectCommand(
       "Project settings update command contains invalid supply types."
     );
   }
+  const isPreviousSchema =
+    command.schemaVersion === previousProjectSettingsUpdateCommandSchemaVersion;
+  if (
+    (isPreviousSchema && Object.keys(command.payload).length !== 8) ||
+    (!isPreviousSchema &&
+      (typeof command.payload.isPublicBuilding !== "boolean" ||
+        Object.keys(command.payload).length !== 9))
+  ) {
+    throw new Error(
+      "Project settings update command contains invalid values."
+    );
+  }
 }
 
 function isValidSupplyTypes(

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

@@ -19,13 +19,14 @@ import {
   resolveProjectVoltage,
 } from "../services/project-voltage.service.js";
 
-export const projectStateSnapshotSchemaVersion = 1 as const;
+export const projectStateSnapshotSchemaVersion = 2 as const;
+const previousProjectStateSnapshotSchemaVersion = 1 as const;
 
 const idSchema = z.string().trim().min(1);
 const nullableStringSchema = z.string().nullable();
 const finiteNumberSchema = z.number().finite();
 
-const projectSchema = z
+const previousProjectSchema = z
   .object({
     id: idSchema,
     name: z.string().trim().min(1),
@@ -42,6 +43,10 @@ const projectSchema = z
   })
   .strict();
 
+const projectSchema = previousProjectSchema
+  .extend({ isPublicBuilding: z.boolean() })
+  .strict();
+
 const distributionBoardSchema = z
   .object({
     id: idSchema,
@@ -267,6 +272,15 @@ export const projectStateSnapshotSchema = z
   })
   .strict();
 
+const previousProjectStateSnapshotSchema = z
+  .object({
+    schemaVersion: z.literal(previousProjectStateSnapshotSchemaVersion),
+    project: previousProjectSchema,
+    distributionBoards: z.array(distributionBoardSchema),
+    ...projectStateSnapshotContents,
+  })
+  .strict();
+
 export type ProjectStateSnapshot = z.infer<
   typeof projectStateSnapshotSchema
 >;
@@ -274,12 +288,35 @@ export type ProjectStateSnapshot = z.infer<
 export function parseProjectStateSnapshot(
   value: unknown
 ): ProjectStateSnapshot {
-  const parsedSnapshot = projectStateSnapshotSchema.parse(value);
+  const parsedSnapshot = projectStateSnapshotSchema.parse(
+    upgradePreviousProjectStateSnapshot(value)
+  );
   const snapshot = normalizeSnapshotPhaseTypes(parsedSnapshot);
   assertProjectStateSnapshotRelations(snapshot);
   return snapshot;
 }
 
+function upgradePreviousProjectStateSnapshot(value: unknown): unknown {
+  if (
+    value === null ||
+    typeof value !== "object" ||
+    Array.isArray(value) ||
+    (value as { schemaVersion?: unknown }).schemaVersion !==
+      previousProjectStateSnapshotSchemaVersion
+  ) {
+    return value;
+  }
+  const previous = previousProjectStateSnapshotSchema.parse(value);
+  return {
+    ...previous,
+    schemaVersion: projectStateSnapshotSchemaVersion,
+    project: {
+      ...previous.project,
+      isPublicBuilding: false,
+    },
+  };
+}
+
 function normalizeSnapshotPhaseTypes(
   snapshot: ProjectStateSnapshot
 ): ProjectStateSnapshot {

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

@@ -14,6 +14,7 @@ export interface ProjectSettingsInput {
   externalProjectNumber: string | null;
   buildingOwner: string | null;
   description: string | null;
+  isPublicBuilding: boolean;
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];
@@ -54,6 +55,9 @@ export function ProjectSettingsModal({
   const [description, setDescription] = useState(
     project.description ?? ""
   );
+  const [isPublicBuilding, setIsPublicBuilding] = useState(
+    project.isPublicBuilding
+  );
   const [singlePhaseVoltageV, setSinglePhaseVoltageV] = useState(
     String(project.singlePhaseVoltageV)
   );
@@ -82,6 +86,7 @@ export function ProjectSettingsModal({
       externalProjectNumber: toNullableString(externalProjectNumber),
       buildingOwner: toNullableString(buildingOwner),
       description: toNullableString(description),
+      isPublicBuilding,
       singlePhaseVoltageV: Number(singlePhaseVoltageV),
       threePhaseVoltageV: Number(threePhaseVoltageV),
       enabledDistributionBoardSupplyTypes,
@@ -269,6 +274,27 @@ export function ProjectSettingsModal({
                     value={description}
                   />
                 </div>
+                <div className="col-12">
+                  <label className="form-check">
+                    <input
+                      checked={isPublicBuilding}
+                      className="form-check-input"
+                      id="public-building"
+                      onChange={(event) =>
+                        setIsPublicBuilding(event.target.checked)
+                      }
+                      type="checkbox"
+                    />
+                    <span className="form-check-label">
+                      Öffentliches Gebäude
+                    </span>
+                  </label>
+                  <div className="form-text ms-4">
+                    Wird bei der späteren Leitungsauslegung berücksichtigt,
+                    insbesondere bei der Auswahl halogenfreier Kabel und
+                    Leitungen.
+                  </div>
+                </div>
                 <div className="col-12 col-md-6">
                   <label className="form-label" htmlFor="single-phase-voltage">
                     Standardspannung 1-phasig [V]

src/frontend/types.ts

@@ -18,6 +18,7 @@ export interface ProjectDto {
   externalProjectNumber: string | null;
   buildingOwner: string | null;
   description: string | null;
+  isPublicBuilding: boolean;
   singlePhaseVoltageV: number;
   threePhaseVoltageV: number;
   enabledDistributionBoardSupplyTypes: DistributionBoardSupplyType[];

src/frontend/utils/api.ts

@@ -245,6 +245,7 @@ export function updateProjectSettings(
     externalProjectNumber: string | null;
     buildingOwner: string | null;
     description: string | null;
+    isPublicBuilding: boolean;
     singlePhaseVoltageV: number;
     threePhaseVoltageV: number;
     enabledDistributionBoardSupplyTypes: ProjectDto["enabledDistributionBoardSupplyTypes"];

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

@@ -8,6 +8,7 @@ export const createProjectSchema = z.object({
   externalProjectNumber: z.string().trim().max(100).optional(),
   buildingOwner: z.string().trim().max(200).optional(),
   description: z.string().trim().max(2000).optional(),
+  isPublicBuilding: z.boolean().optional(),
   singlePhaseVoltageV: z.number().positive().optional(),
   threePhaseVoltageV: z.number().positive().optional(),
 });
@@ -20,6 +21,7 @@ export const updateProjectSettingsSchema = z
     externalProjectNumber: z.string().trim().max(100).nullable(),
     buildingOwner: z.string().trim().max(200).nullable(),
     description: z.string().trim().max(2000).nullable(),
+    isPublicBuilding: z.boolean(),
     singlePhaseVoltageV: z.number().positive(),
     threePhaseVoltageV: z.number().positive(),
     enabledDistributionBoardSupplyTypes: z

tests/project-command.service.test.ts

@@ -1057,6 +1057,7 @@ describe("project command service", () => {
           externalProjectNumber: null,
           buildingOwner: null,
           description: null,
+          isPublicBuilding: true,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
           enabledDistributionBoardSupplyTypes: [
@@ -1073,6 +1074,7 @@ describe("project command service", () => {
       assert.deepEqual(
         context.db
           .select({
+            isPublicBuilding: projects.isPublicBuilding,
             singlePhaseVoltageV: projects.singlePhaseVoltageV,
             threePhaseVoltageV: projects.threePhaseVoltageV,
           })
@@ -1080,6 +1082,7 @@ describe("project command service", () => {
           .where(eq(projects.id, "project-1"))
           .get(),
         {
+          isPublicBuilding: true,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
         }
@@ -1093,6 +1096,7 @@ describe("project command service", () => {
       assert.deepEqual(
         context.db
           .select({
+            isPublicBuilding: projects.isPublicBuilding,
             singlePhaseVoltageV: projects.singlePhaseVoltageV,
             threePhaseVoltageV: projects.threePhaseVoltageV,
           })
@@ -1100,6 +1104,7 @@ describe("project command service", () => {
           .where(eq(projects.id, "project-1"))
           .get(),
         {
+          isPublicBuilding: false,
           singlePhaseVoltageV: 230,
           threePhaseVoltageV: 400,
         }

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

@@ -47,6 +47,7 @@ function getSettings(context: DatabaseContext) {
       externalProjectNumber: projects.externalProjectNumber,
       buildingOwner: projects.buildingOwner,
       description: projects.description,
+      isPublicBuilding: projects.isPublicBuilding,
       singlePhaseVoltageV: projects.singlePhaseVoltageV,
       threePhaseVoltageV: projects.threePhaseVoltageV,
       enabledDistributionBoardSupplyTypes:
@@ -69,6 +70,7 @@ function settings(
     externalProjectNumber: null,
     buildingOwner: null,
     description: null,
+    isPublicBuilding: false,
     singlePhaseVoltageV: 230,
     threePhaseVoltageV: 400,
     enabledDistributionBoardSupplyTypes: [
@@ -204,6 +206,7 @@ describe("project settings project-command repository", () => {
           externalProjectNumber: null,
           buildingOwner: null,
           description: null,
+          isPublicBuilding: false,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
           enabledDistributionBoardSupplyTypes: [
@@ -231,6 +234,7 @@ describe("project settings project-command repository", () => {
         ...settings(),
         name: "Neuer Projektname",
         buildingOwner: "Beispiel Bau GmbH",
+        isPublicBuilding: true,
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
         enabledDistributionBoardSupplyTypes: [
@@ -252,6 +256,7 @@ describe("project settings project-command repository", () => {
         ...settings({
           name: "Neuer Projektname",
           buildingOwner: "Beispiel Bau GmbH",
+          isPublicBuilding: true,
           singlePhaseVoltageV: 240,
           threePhaseVoltageV: 415,
         }),
@@ -273,6 +278,7 @@ describe("project settings project-command repository", () => {
         externalProjectNumber: null,
         buildingOwner: null,
         description: null,
+        isPublicBuilding: false,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
         enabledDistributionBoardSupplyTypes: [
@@ -300,6 +306,7 @@ describe("project settings project-command repository", () => {
         externalProjectNumber: null,
         buildingOwner: null,
         description: null,
+        isPublicBuilding: false,
         singlePhaseVoltageV: 230,
         threePhaseVoltageV: 400,
         enabledDistributionBoardSupplyTypes: [
@@ -338,6 +345,7 @@ describe("project settings project-command repository", () => {
         externalProjectNumber: null,
         buildingOwner: "Beispiel Bau GmbH",
         description: null,
+        isPublicBuilding: true,
         singlePhaseVoltageV: 240,
         threePhaseVoltageV: 415,
         enabledDistributionBoardSupplyTypes: [
@@ -365,6 +373,66 @@ describe("project settings project-command repository", () => {
     }
   });
 
+  it("preserves the building classification when applying a baseline command", () => {
+    const context = createTestDatabase();
+    try {
+      context.db
+        .update(projects)
+        .set({ isPublicBuilding: true })
+        .where(eq(projects.id, "project-1"))
+        .run();
+      const repository = new ProjectSettingsProjectCommandRepository(
+        context.db
+      );
+
+      const forward = repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: {
+          schemaVersion: 1,
+          type: "project.update-settings",
+          payload: {
+            name: "Stand aus Baseline-Command",
+            internalProjectNumber: "INT-1",
+            externalProjectNumber: null,
+            buildingOwner: null,
+            description: null,
+            singlePhaseVoltageV: 230,
+            threePhaseVoltageV: 400,
+            enabledDistributionBoardSupplyTypes: [
+              "AV",
+              "SV",
+              "EV",
+              "USV",
+              "MSR",
+              "SiBe",
+            ],
+          },
+        },
+      });
+
+      assert.equal(getSettings(context)?.name, "Stand aus Baseline-Command");
+      assert.equal(getSettings(context)?.isPublicBuilding, true);
+      assert.equal(forward.inverse.schemaVersion, 1);
+
+      const history = new ProjectHistoryRepository(context.db);
+      const undoStep = history.getNextCommand("project-1", "undo");
+      assert.ok(undoStep);
+      repository.executeUpdate({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: undoStep.changeSetId,
+        command: forward.inverse,
+      });
+      assert.equal(getSettings(context)?.name, "Testprojekt");
+      assert.equal(getSettings(context)?.isPublicBuilding, true);
+    } finally {
+      context.close();
+    }
+  });
+
   it("persists the project supply-type selection and rejects disabling an in-use type", () => {
     const context = createTestDatabase();
     try {

tests/project-state-snapshot.test.ts

@@ -18,6 +18,7 @@ function minimalSnapshot() {
       externalProjectNumber: null,
       buildingOwner: null,
       description: null,
+      isPublicBuilding: true,
       singlePhaseVoltageV: 230,
       threePhaseVoltageV: 400,
       enabledDistributionBoardSupplyTypes: [
@@ -142,7 +143,18 @@ describe("project state snapshot model", () => {
     );
   });
 
-  it("rejects pre-baseline snapshot shapes", () => {
+  it("upgrades the supported baseline snapshot with a safe building default", () => {
+    const baseline = structuredClone(minimalSnapshot());
+    baseline.schemaVersion = 1 as typeof baseline.schemaVersion;
+    delete (baseline.project as Record<string, unknown>).isPublicBuilding;
+
+    const upgraded = parseProjectStateSnapshot(baseline);
+
+    assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
+    assert.equal(upgraded.project.isPublicBuilding, false);
+  });
+
+  it("rejects malformed baseline and unknown snapshot shapes", () => {
     const outdated = structuredClone(minimalSnapshot());
     delete (outdated.project as Record<string, unknown>).description;
     assert.throws(() => parseProjectStateSnapshot(outdated));

tests/project-version-history.test.ts

@@ -247,6 +247,7 @@ describe("project settings presentation", () => {
           externalProjectNumber: null,
           buildingOwner: null,
           description: null,
+          isPublicBuilding: true,
           singlePhaseVoltageV: 230,
           threePhaseVoltageV: 400,
           enabledDistributionBoardSupplyTypes: [
@@ -262,6 +263,7 @@ describe("project settings presentation", () => {
     assert.match(markup, /MSR/);
     assert.match(markup, /SiBe/);
     assert.match(markup, /in Verwendung/);
+    assert.match(markup, /Öffentliches Gebäude/);
   });
 });