Add component structure commands

AGENTS.md

@@ -301,6 +301,12 @@ inverse removes only the same unchanged and still-empty structure; the POST
 route requires `expectedRevision` and returns the updated history state.
 Stored schema-version 1 and 2 setup commands remain executable with their four
 legacy sections and without invented components.
+Mutable group-protection and auxiliary distribution-board components use
+`distribution-board-component.insert` and
+`distribution-board-component.delete`. Their complete snapshots include the
+optional one-to-one protection-device state, and deletion rejects stale data.
+Fixed main-switch and surge-protection header roles are excluded from these
+general component commands.
 Distribution-board floor assignment and a project-enabled supply type use
 `distribution-board.update`; both values are snapshot/export fields and one
 persistent undo step.

docs/current-architecture.md

@@ -285,6 +285,16 @@ nachträgliche Bearbeitung prüfen die Projektzugehörigkeit der Etage und die
 Freigabe der Netzart in den Projekteinstellungen.
 Gespeicherte Anlage-Commands der Schemas 1 und 2 bleiben mit ihren vier
 Legacy-Abschnitten und ohne nachträglich erfundene Komponenten ausführbar.
+`distribution-board-component.insert` und
+`distribution-board-component.delete` versionieren die Anlage und Entfernung
+veränderlicher Gruppen-Schutzgeräte und zusätzlicher Verteilergeräte. Der
+vollständige Snapshot enthält die stabile Komponenten-UUID und, für
+Gruppen-Schutzgeräte, die getrennte 1:1-Schutzgerätekonfiguration. Eigentum an
+Projekt, Stromkreisliste und Gruppe sowie der unveränderte Löschzustand werden
+innerhalb derselben Transaktion geprüft. Die festen Kopfkomponenten
+Hauptschalter und Überspannungsableiter sind von diesen allgemeinen Commands
+ausgeschlossen. API- und Editorintegration folgen in den nächsten
+Arbeitspaketen.
 `distribution-board.update` versioniert Etage, Netzart und den
 verteilerweiten Gleichzeitigkeitsfaktor gemeinsam und stellt alle Werte über
 dauerhaftes Undo/Redo wieder her. Der Faktor liegt zwischen `0` und `1` und
@@ -355,8 +365,9 @@ Kopieren in ein Projekt erzeugt ein eigenständiges Projektgerät.
   Ein triggergeführtes Register erzwingt bereits eine normalisierte,
   stromkreislistenweite BMK-Eindeutigkeit über Stromkreise und
   Verteilerkomponenten. Snapshot- und Transfer-Integration verwenden
-  Snapshot-Schema 7; Command- und UI-Integration folgen in den nächsten
+  Snapshot-Schema 7. Persistente Insert/Delete-Commands für veränderliche
-  abgegrenzten Arbeitspaketen.
+  Verteilerkomponenten sind integriert; weitere Command- und UI-Schritte
+  folgen in abgegrenzten Arbeitspaketen.
 
 PostgreSQL ist bewusst nicht implementiert. Die Domainregeln und
 Transaktionsgrenzen sollen portabel bleiben; Schema und Betriebsmodell benötigen

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

@@ -20,7 +20,10 @@ requirements and intended sequencing, not proof of implementation.
   mapping.
 - [x] Phase C1: versioned new-board command with three groups and fixed header
   components.
-- [ ] Phase C2: component and group CRUD/reorder commands.
+- [x] Phase C2a1: persistent insert/delete commands for mutable group
+  protection and auxiliary components.
+- [ ] Phase C2a2: component update and reorder commands.
+- [ ] Phase C2b: group CRUD and reorder commands.
 - [ ] Phase D: group numbering, moves and destructive operations.
 - [ ] Phase E: editor projection and editing.
 - [ ] Phase F: documentation and full GUI verification.

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

@@ -593,8 +593,9 @@ Acceptance:
 
 ### C. Persistent Commands and Board Defaults
 
-Status: In progress. New-board defaults C1 are complete; component and group
+Status: In progress. New-board defaults C1 and component insert/delete commands
-management commands C2 are pending.
+C2a1 are complete. Component update/reorder and group management remain
+pending.
 
 - extend `distribution-board.insert` with fixed components and three groups
 - implement component and group CRUD commands
@@ -612,6 +613,19 @@ Implemented in C1:
 - stored schema versions 1 and 2 retain four legacy sections and receive no
   invented components
 
+Implemented in C2a1:
+
+- `distribution-board-component.insert` and
+  `distribution-board-component.delete` persist complete component snapshots
+  with their optional one-to-one protection-device configuration
+- mutable group protection components validate their group ownership and
+  protection-device combination before writing
+- auxiliary components remain footer entries without protection-device data
+- fixed header roles are excluded from these general CRUD commands
+- deletion requires an exact unchanged snapshot; Undo/Redo restores the same
+  component UUID and a late revision/history failure rolls back the complete
+  write
+
 Acceptance:
 
 - new boards contain the agreed fixed structure

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

@@ -0,0 +1,193 @@
+import { and, eq } from "drizzle-orm";
+import {
+  assertDistributionBoardComponentDeleteProjectCommand,
+  assertDistributionBoardComponentInsertProjectCommand,
+  createDistributionBoardComponentDeleteProjectCommand,
+  createDistributionBoardComponentInsertProjectCommand,
+  distributionBoardComponentDeleteCommandType,
+  distributionBoardComponentInsertCommandType,
+  type DistributionBoardComponentSnapshot,
+  type DistributionBoardComponentStructureProjectCommand,
+} from "../../domain/models/distribution-board-component-structure-project-command.model.js";
+import type {
+  DistributionBoardComponentStructureProjectCommandStore,
+  ExecuteDistributionBoardComponentStructureCommandInput,
+} from "../../domain/ports/distribution-board-component-structure-project-command.store.js";
+import type { AppDatabase } from "../database-context.js";
+import { circuitLists } from "../schema/circuit-lists.js";
+import { circuitSections } from "../schema/circuit-sections.js";
+import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
+import { distributionBoardComponents } from "../schema/distribution-board-components.js";
+import { executeProjectCommandTransaction } from "./project-command-transaction.persistence.js";
+
+export class DistributionBoardComponentStructureProjectCommandRepository
+  implements DistributionBoardComponentStructureProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  execute(
+    input: ExecuteDistributionBoardComponentStructureCommandInput
+  ) {
+    return executeProjectCommandTransaction(
+      this.database,
+      input,
+      (tx) =>
+        this.applyCommand(
+          tx,
+          input.projectId,
+          input.command
+        )
+    );
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    projectId: string,
+    command: DistributionBoardComponentStructureProjectCommand
+  ): DistributionBoardComponentStructureProjectCommand {
+    if (command.type === distributionBoardComponentInsertCommandType) {
+      assertDistributionBoardComponentInsertProjectCommand(command);
+      this.insert(database, projectId, command.payload.snapshot);
+      return createDistributionBoardComponentDeleteProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    if (command.type === distributionBoardComponentDeleteCommandType) {
+      assertDistributionBoardComponentDeleteProjectCommand(command);
+      this.delete(database, projectId, command.payload.snapshot);
+      return createDistributionBoardComponentInsertProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    throw new Error(
+      "Unsupported distribution-board component structure command."
+    );
+  }
+
+  private insert(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: DistributionBoardComponentSnapshot
+  ) {
+    this.assertOwnership(database, projectId, snapshot);
+    const existing = database
+      .select({ id: distributionBoardComponents.id })
+      .from(distributionBoardComponents)
+      .where(eq(distributionBoardComponents.id, snapshot.component.id))
+      .get();
+    if (existing) {
+      throw new Error("Distribution-board component id already exists.");
+    }
+    database
+      .insert(distributionBoardComponents)
+      .values(snapshot.component)
+      .run();
+    if (snapshot.protectionDevice !== null) {
+      database
+        .insert(distributionBoardComponentProtectionDevices)
+        .values(snapshot.protectionDevice)
+        .run();
+    }
+  }
+
+  private delete(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: DistributionBoardComponentSnapshot
+  ) {
+    this.assertOwnership(database, projectId, snapshot);
+    const component = database
+      .select()
+      .from(distributionBoardComponents)
+      .where(eq(distributionBoardComponents.id, snapshot.component.id))
+      .get();
+    const protection = database
+      .select()
+      .from(distributionBoardComponentProtectionDevices)
+      .where(
+        eq(
+          distributionBoardComponentProtectionDevices.componentId,
+          snapshot.component.id
+        )
+      )
+      .get();
+    if (
+      !component ||
+      !sameRecord(snapshot.component, component) ||
+      !sameNullableRecord(snapshot.protectionDevice, protection)
+    ) {
+      throw new Error(
+        "Distribution-board component changed before deletion."
+      );
+    }
+    const deleted = database
+      .delete(distributionBoardComponents)
+      .where(
+        and(
+          eq(distributionBoardComponents.id, component.id),
+          eq(
+            distributionBoardComponents.circuitListId,
+            snapshot.component.circuitListId
+          )
+        )
+      )
+      .run();
+    if (deleted.changes !== 1) {
+      throw new Error(
+        "Distribution-board component could not be deleted."
+      );
+    }
+  }
+
+  private assertOwnership(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: DistributionBoardComponentSnapshot
+  ) {
+    const list = database
+      .select({ projectId: circuitLists.projectId })
+      .from(circuitLists)
+      .where(eq(circuitLists.id, snapshot.component.circuitListId))
+      .get();
+    if (!list || list.projectId !== projectId) {
+      throw new Error(
+        "Distribution-board component circuit list does not belong to project."
+      );
+    }
+    if (snapshot.component.sectionId !== null) {
+      const section = database
+        .select({ circuitListId: circuitSections.circuitListId })
+        .from(circuitSections)
+        .where(eq(circuitSections.id, snapshot.component.sectionId))
+        .get();
+      if (
+        !section ||
+        section.circuitListId !== snapshot.component.circuitListId
+      ) {
+        throw new Error(
+          "Distribution-board component section does not belong to circuit list."
+        );
+      }
+    }
+  }
+}
+
+function sameNullableRecord(
+  expected: object | null,
+  actual: object | undefined
+) {
+  return expected === null
+    ? actual === undefined
+    : actual !== undefined && sameRecord(expected, actual);
+}
+
+function sameRecord(expected: object, actual: object) {
+  const expectedEntries = Object.entries(expected);
+  const actualRecord = actual as Record<string, unknown>;
+  return (
+    expectedEntries.length === Object.keys(actual).length &&
+    expectedEntries.every(
+      ([key, value]) => actualRecord[key] === value
+    )
+  );
+}

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

@@ -0,0 +1,254 @@
+import { distributionBoardComponentPlacements } from "../../shared/constants/distribution-board-component.js";
+import type { DistributionBoardComponentPlacement } from "../../shared/constants/distribution-board-component.js";
+import { protectionDeviceConfigurationSchema } from "../../shared/validation/protection-device.schemas.js";
+import type {
+  BreakerTripCharacteristic,
+  FuseUtilizationCategory,
+  ProtectionDeviceType,
+  RcdType,
+} from "../../shared/constants/protection-device.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const distributionBoardComponentInsertCommandType =
+  "distribution-board-component.insert" as const;
+export const distributionBoardComponentDeleteCommandType =
+  "distribution-board-component.delete" as const;
+export const distributionBoardComponentStructureCommandSchemaVersion =
+  1 as const;
+
+type MutableDistributionBoardComponentRole =
+  | "group_upstream_protection"
+  | "group_residual_current_protection"
+  | "auxiliary";
+
+export interface DistributionBoardComponentSnapshot {
+  component: {
+    id: string;
+    circuitListId: string;
+    sectionId: string | null;
+    equipmentIdentifier: string;
+    name: string;
+    role: MutableDistributionBoardComponentRole;
+    placement: DistributionBoardComponentPlacement;
+    sortOrder: number;
+  };
+  protectionDevice: {
+    componentId: string;
+    type: ProtectionDeviceType;
+    ratedCurrentA: number;
+    fuseUtilizationCategory: FuseUtilizationCategory | null;
+    tripCharacteristic: BreakerTripCharacteristic | null;
+    rcdType: RcdType | null;
+    ratedResidualCurrentMa: number | null;
+  } | null;
+}
+
+interface DistributionBoardComponentStructurePayload {
+  snapshot: DistributionBoardComponentSnapshot;
+}
+
+export interface DistributionBoardComponentInsertProjectCommand
+  extends SerializedProjectCommand<DistributionBoardComponentStructurePayload> {
+  schemaVersion: typeof distributionBoardComponentStructureCommandSchemaVersion;
+  type: typeof distributionBoardComponentInsertCommandType;
+}
+
+export interface DistributionBoardComponentDeleteProjectCommand
+  extends SerializedProjectCommand<DistributionBoardComponentStructurePayload> {
+  schemaVersion: typeof distributionBoardComponentStructureCommandSchemaVersion;
+  type: typeof distributionBoardComponentDeleteCommandType;
+}
+
+export type DistributionBoardComponentStructureProjectCommand =
+  | DistributionBoardComponentInsertProjectCommand
+  | DistributionBoardComponentDeleteProjectCommand;
+
+export function createDistributionBoardComponentInsertProjectCommand(
+  snapshot: DistributionBoardComponentSnapshot
+): DistributionBoardComponentInsertProjectCommand {
+  const command: DistributionBoardComponentInsertProjectCommand = {
+    schemaVersion:
+      distributionBoardComponentStructureCommandSchemaVersion,
+    type: distributionBoardComponentInsertCommandType,
+    payload: { snapshot },
+  };
+  assertDistributionBoardComponentInsertProjectCommand(command);
+  return command;
+}
+
+export function createDistributionBoardComponentDeleteProjectCommand(
+  snapshot: DistributionBoardComponentSnapshot
+): DistributionBoardComponentDeleteProjectCommand {
+  const command: DistributionBoardComponentDeleteProjectCommand = {
+    schemaVersion:
+      distributionBoardComponentStructureCommandSchemaVersion,
+    type: distributionBoardComponentDeleteCommandType,
+    payload: { snapshot },
+  };
+  assertDistributionBoardComponentDeleteProjectCommand(command);
+  return command;
+}
+
+export function assertDistributionBoardComponentInsertProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is DistributionBoardComponentInsertProjectCommand {
+  assertStructureCommand(
+    command,
+    distributionBoardComponentInsertCommandType
+  );
+}
+
+export function assertDistributionBoardComponentDeleteProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is DistributionBoardComponentDeleteProjectCommand {
+  assertStructureCommand(
+    command,
+    distributionBoardComponentDeleteCommandType
+  );
+}
+
+function assertStructureCommand(
+  command: SerializedProjectCommand<unknown>,
+  type:
+    | typeof distributionBoardComponentInsertCommandType
+    | typeof distributionBoardComponentDeleteCommandType
+) {
+  if (
+    command.schemaVersion !==
+      distributionBoardComponentStructureCommandSchemaVersion ||
+    command.type !== type ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 1
+  ) {
+    throw new Error(
+      "Unsupported distribution-board component structure command."
+    );
+  }
+  assertDistributionBoardComponentSnapshot(command.payload.snapshot);
+}
+
+export function assertDistributionBoardComponentSnapshot(
+  value: unknown
+): asserts value is DistributionBoardComponentSnapshot {
+  if (
+    !isPlainObject(value) ||
+    Object.keys(value).length !== 2 ||
+    !isPlainObject(value.component)
+  ) {
+    throw new Error(
+      "Distribution-board component snapshot is invalid."
+    );
+  }
+  const component = value.component;
+  if (Object.keys(component).length !== 8) {
+    throw new Error(
+      "Distribution-board component snapshot is incomplete."
+    );
+  }
+  for (const field of [
+    "id",
+    "circuitListId",
+    "equipmentIdentifier",
+    "name",
+  ] as const) {
+    assertNonEmptyString(component[field], `component.${field}`);
+  }
+  if (
+    component.role !== "group_upstream_protection" &&
+    component.role !== "group_residual_current_protection" &&
+    component.role !== "auxiliary"
+  ) {
+    throw new Error(
+      "Fixed distribution-board components cannot use component CRUD commands."
+    );
+  }
+  if (
+    !distributionBoardComponentPlacements.includes(
+      component.placement as DistributionBoardComponentPlacement
+    ) ||
+    !Number.isFinite(component.sortOrder)
+  ) {
+    throw new Error(
+      "Distribution-board component placement or sort order is invalid."
+    );
+  }
+  const groupComponent = component.role !== "auxiliary";
+  if (
+    groupComponent !==
+      (component.placement === "group" &&
+        typeof component.sectionId === "string" &&
+        Boolean(component.sectionId.trim()))
+  ) {
+    throw new Error(
+      "Group protection components require group placement and a section."
+    );
+  }
+  if (
+    !groupComponent &&
+    (component.placement !== "footer" ||
+      component.sectionId !== null)
+  ) {
+    throw new Error(
+      "Auxiliary components require footer placement without a section."
+    );
+  }
+
+  if (groupComponent) {
+    if (!isPlainObject(value.protectionDevice)) {
+      throw new Error(
+        "Group protection components require protection data."
+      );
+    }
+    assertProtectionDevice(
+      value.protectionDevice,
+      component.id as string
+    );
+  } else if (value.protectionDevice !== null) {
+    throw new Error(
+      "Auxiliary components cannot contain protection data."
+    );
+  }
+}
+
+function assertProtectionDevice(
+  value: Record<string, unknown>,
+  componentId: string
+) {
+  if (
+    Object.keys(value).length !== 7 ||
+    value.componentId !== componentId
+  ) {
+    throw new Error(
+      "Distribution-board component protection snapshot is invalid."
+    );
+  }
+  const result = protectionDeviceConfigurationSchema.safeParse({
+    type: value.type,
+    ratedCurrentA: value.ratedCurrentA,
+    ...(value.fuseUtilizationCategory === null
+      ? {}
+      : { fuseUtilizationCategory: value.fuseUtilizationCategory }),
+    ...(value.tripCharacteristic === null
+      ? {}
+      : { tripCharacteristic: value.tripCharacteristic }),
+    ...(value.rcdType === null ? {} : { rcdType: value.rcdType }),
+    ...(value.ratedResidualCurrentMa === null
+      ? {}
+      : { ratedResidualCurrentMa: value.ratedResidualCurrentMa }),
+  });
+  if (!result.success) {
+    throw new Error(
+      "Distribution-board component protection configuration is invalid."
+    );
+  }
+}
+
+function assertNonEmptyString(value: unknown, field: string) {
+  if (typeof value !== "string" || !value.trim()) {
+    throw new Error(`${field} must be a non-empty string.`);
+  }
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

src/domain/ports/distribution-board-component-structure-project-command.store.ts

@@ -0,0 +1,24 @@
+import type { DistributionBoardComponentStructureProjectCommand } from "../models/distribution-board-component-structure-project-command.model.js";
+import type {
+  AppendedProjectRevision,
+  ProjectRevisionSource,
+} from "./project-revision.store.js";
+
+export interface ExecuteDistributionBoardComponentStructureCommandInput {
+  projectId: string;
+  expectedRevision: number;
+  source: ProjectRevisionSource;
+  description?: string;
+  actorId?: string;
+  historyTargetChangeSetId?: string;
+  command: DistributionBoardComponentStructureProjectCommand;
+}
+
+export interface DistributionBoardComponentStructureProjectCommandStore {
+  execute(
+    input: ExecuteDistributionBoardComponentStructureCommandInput
+  ): {
+    revision: AppendedProjectRevision;
+    inverse: DistributionBoardComponentStructureProjectCommand;
+  };
+}

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

@@ -41,6 +41,12 @@ import {
   assertDistributionBoardUpdateProjectCommand,
   distributionBoardUpdateCommandType,
 } from "../models/distribution-board-project-command.model.js";
+import {
+  assertDistributionBoardComponentDeleteProjectCommand,
+  assertDistributionBoardComponentInsertProjectCommand,
+  distributionBoardComponentDeleteCommandType,
+  distributionBoardComponentInsertCommandType,
+} from "../models/distribution-board-component-structure-project-command.model.js";
 import {
   assertDistributionBoardDeleteProjectCommand,
   assertDistributionBoardInsertProjectCommand,
@@ -91,6 +97,7 @@ import type { CircuitSectionReorderProjectCommandStore } from "../ports/circuit-
 import type { CircuitSectionRenumberProjectCommandStore } from "../ports/circuit-section-renumber-project-command.store.js";
 import type { CircuitStructureProjectCommandStore } from "../ports/circuit-structure-project-command.store.js";
 import type { DistributionBoardStructureProjectCommandStore } from "../ports/distribution-board-structure-project-command.store.js";
+import type { DistributionBoardComponentStructureProjectCommandStore } from "../ports/distribution-board-component-structure-project-command.store.js";
 import type {
   ExecuteProjectHistoryCommandInput,
   ExecutedProjectCommand,
@@ -135,6 +142,7 @@ export class ProjectCommandService implements ProjectCommandExecutor {
     private readonly projectDeviceRowSyncStore: ProjectDeviceRowSyncProjectCommandStore,
     private readonly projectSettingsStore: ProjectSettingsProjectCommandStore,
     private readonly projectStateRestoreStore: ProjectStateRestoreCommandStore,
+    private readonly distributionBoardComponentStructureStore: DistributionBoardComponentStructureProjectCommandStore,
     private readonly historyStore: ProjectHistoryStore
   ) {}
 
@@ -296,6 +304,24 @@ export class ProjectCommandService implements ProjectCommandExecutor {
           command: input.command,
         }).revision;
       }
+      case distributionBoardComponentInsertCommandType: {
+        assertDistributionBoardComponentInsertProjectCommand(
+          input.command
+        );
+        return this.distributionBoardComponentStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case distributionBoardComponentDeleteCommandType: {
+        assertDistributionBoardComponentDeleteProjectCommand(
+          input.command
+        );
+        return this.distributionBoardComponentStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
       case projectFloorInsertCommandType: {
         assertProjectFloorInsertProjectCommand(input.command);
         return this.projectLocationStructureStore.execute({

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

@@ -33,6 +33,8 @@ const commandTypeLabels: Record<string, string> = {
   "distribution-board.insert": "Verteilung angelegt",
   "distribution-board.update": "Verteilung bearbeitet",
   "distribution-board.delete": "Verteilung entfernt",
+  "distribution-board-component.insert": "Verteilergerät angelegt",
+  "distribution-board-component.delete": "Verteilergerät entfernt",
   "project-floor.insert": "Geschoss angelegt",
   "project-floor.delete": "Geschoss entfernt",
   "project-room.insert": "Raum angelegt",

src/server/composition/project-command-stores.ts

@@ -7,6 +7,7 @@ import { CircuitSectionReorderProjectCommandRepository } from "../../db/reposito
 import { CircuitSectionRenumberProjectCommandRepository } from "../../db/repositories/circuit-section-renumber-project-command.repository.js";
 import { CircuitStructureProjectCommandRepository } from "../../db/repositories/circuit-structure-project-command.repository.js";
 import { DistributionBoardStructureProjectCommandRepository } from "../../db/repositories/distribution-board-structure-project-command.repository.js";
+import { DistributionBoardComponentStructureProjectCommandRepository } from "../../db/repositories/distribution-board-component-structure-project-command.repository.js";
 import { ProjectHistoryRepository } from "../../db/repositories/project-history.repository.js";
 import { ProjectLocationStructureProjectCommandRepository } from "../../db/repositories/project-location-structure-project-command.repository.js";
 import { ProjectDeviceProjectCommandRepository } from "../../db/repositories/project-device-project-command.repository.js";
@@ -27,6 +28,8 @@ export const circuitStructureProjectCommandStore =
   new CircuitStructureProjectCommandRepository(db);
 export const distributionBoardStructureProjectCommandStore =
   new DistributionBoardStructureProjectCommandRepository(db);
+export const distributionBoardComponentStructureProjectCommandStore =
+  new DistributionBoardComponentStructureProjectCommandRepository(db);
 export const projectLocationStructureProjectCommandStore =
   new ProjectLocationStructureProjectCommandRepository(db);
 export const circuitSectionReorderProjectCommandStore =
@@ -59,5 +62,6 @@ export const projectCommandService = new ProjectCommandService(
   projectDeviceRowSyncProjectCommandStore,
   projectSettingsProjectCommandStore,
   projectStateRestoreCommandStore,
+  distributionBoardComponentStructureProjectCommandStore,
   projectHistoryStore
 );

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

@@ -0,0 +1,433 @@
+import path from "node:path";
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { eq } from "drizzle-orm";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import {
+  createDatabaseContext,
+  type DatabaseContext,
+} from "../src/db/database-context.js";
+import { DistributionBoardComponentStructureProjectCommandRepository } from "../src/db/repositories/distribution-board-component-structure-project-command.repository.js";
+import { ProjectHistoryRepository } from "../src/db/repositories/project-history.repository.js";
+import { circuitLists } from "../src/db/schema/circuit-lists.js";
+import { circuitSections } from "../src/db/schema/circuit-sections.js";
+import { distributionBoardComponentProtectionDevices } from "../src/db/schema/distribution-board-component-protection-devices.js";
+import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
+import { projectRevisions } from "../src/db/schema/project-revisions.js";
+import { projects } from "../src/db/schema/projects.js";
+import {
+  createDistributionBoardComponentInsertProjectCommand,
+  type DistributionBoardComponentSnapshot,
+} from "../src/domain/models/distribution-board-component-structure-project-command.model.js";
+import { ProjectRevisionConflictError } from "../src/domain/errors/project-revision-conflict.error.js";
+import { DistributionBoardFixtureRepository } from "./support/distribution-board-fixture.js";
+
+function createTestDatabase(): DatabaseContext {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  context.db
+    .insert(projects)
+    .values([
+      { id: "project-1", name: "Projekt" },
+      { id: "project-2", name: "Fremdprojekt" },
+    ])
+    .run();
+  new DistributionBoardFixtureRepository(
+    context.db
+  ).createWithCircuitListAndDefaultSections("project-1", "UV-01");
+  return context;
+}
+
+function getListAndSection(context: DatabaseContext) {
+  const list = context.db.select().from(circuitLists).get();
+  assert.ok(list);
+  const section = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.circuitListId, list.id))
+    .get();
+  assert.ok(section);
+  return { list, section };
+}
+
+describe("distribution-board component structure project command", () => {
+  it("inserts an auxiliary component and preserves it through undo and redo", () => {
+    const context = createTestDatabase();
+    try {
+      const { list } = getListAndSection(context);
+      const snapshot: DistributionBoardComponentSnapshot = {
+        component: {
+          id: "component-aux",
+          circuitListId: list.id,
+          sectionId: null,
+          equipmentIdentifier: "-K1",
+          name: "KNX Schaltaktor",
+          role: "auxiliary",
+          placement: "footer",
+          sortOrder: 10,
+        },
+        protectionDevice: null,
+      };
+      const repository =
+        new DistributionBoardComponentStructureProjectCommandRepository(
+          context.db
+        );
+      const history = new ProjectHistoryRepository(context.db);
+      const command =
+        createDistributionBoardComponentInsertProjectCommand(snapshot);
+      const inserted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.deepEqual(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(eq(distributionBoardComponents.id, "component-aux"))
+          .get(),
+        snapshot.component
+      );
+
+      const undo = history.getNextCommand("project-1", "undo");
+      assert.ok(undo);
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: undo.changeSetId,
+        command: inserted.inverse,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(eq(distributionBoardComponents.id, "component-aux"))
+          .get(),
+        undefined
+      );
+
+      const redo = history.getNextCommand("project-1", "redo");
+      assert.ok(redo);
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "redo",
+        historyTargetChangeSetId: redo.changeSetId,
+        command,
+      });
+      assert.ok(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(eq(distributionBoardComponents.id, "component-aux"))
+          .get()
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("stores and restores a group RCD with its protection data atomically", () => {
+    const context = createTestDatabase();
+    try {
+      const { list, section } = getListAndSection(context);
+      const snapshot: DistributionBoardComponentSnapshot = {
+        component: {
+          id: "component-rcd",
+          circuitListId: list.id,
+          sectionId: section.id,
+          equipmentIdentifier: "-1Q1.0",
+          name: "Gruppen-FI",
+          role: "group_residual_current_protection",
+          placement: "group",
+          sortOrder: 10,
+        },
+        protectionDevice: {
+          componentId: "component-rcd",
+          type: "FI",
+          ratedCurrentA: 40,
+          fuseUtilizationCategory: null,
+          tripCharacteristic: null,
+          rcdType: "A",
+          ratedResidualCurrentMa: 30,
+        },
+      };
+      const repository =
+        new DistributionBoardComponentStructureProjectCommandRepository(
+          context.db
+        );
+      const inserted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command:
+          createDistributionBoardComponentInsertProjectCommand(
+            snapshot
+          ),
+      });
+      assert.deepEqual(
+        context.db
+          .select()
+          .from(distributionBoardComponentProtectionDevices)
+          .get(),
+        snapshot.protectionDevice
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: inserted.inverse,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(distributionBoardComponentProtectionDevices)
+          .get(),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects fixed roles, foreign sections, duplicate BMKs and stale revisions", () => {
+    const context = createTestDatabase();
+    try {
+      const { list } = getListAndSection(context);
+      assert.throws(
+        () =>
+          createDistributionBoardComponentInsertProjectCommand({
+            component: {
+              id: "fixed",
+              circuitListId: list.id,
+              sectionId: null,
+              equipmentIdentifier: "-Q1",
+              name: "Hauptschalter",
+              role: "main_switch",
+              placement: "header",
+              sortOrder: 10,
+            } as never,
+            protectionDevice: null,
+          }),
+        /Fixed distribution-board components/
+      );
+      const snapshot: DistributionBoardComponentSnapshot = {
+        component: {
+          id: "duplicate",
+          circuitListId: list.id,
+          sectionId: null,
+          equipmentIdentifier: " -q0 ",
+          name: "Doppelt",
+          role: "auxiliary",
+          placement: "footer",
+          sortOrder: 10,
+        },
+        protectionDevice: null,
+      };
+      const repository =
+        new DistributionBoardComponentStructureProjectCommandRepository(
+          context.db
+        );
+      const foreignBoard = new DistributionBoardFixtureRepository(
+        context.db
+      ).createWithCircuitListAndDefaultSections(
+        "project-2",
+        "UV fremd"
+      );
+      const foreignSection = context.db
+        .select()
+        .from(circuitSections)
+        .where(
+          eq(circuitSections.circuitListId, foreignBoard.id)
+        )
+        .get();
+      assert.ok(foreignSection);
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command:
+              createDistributionBoardComponentInsertProjectCommand({
+                component: {
+                  id: "foreign-section",
+                  circuitListId: list.id,
+                  sectionId: foreignSection.id,
+                  equipmentIdentifier: "-1Q2.0",
+                  name: "Fremder Gruppen-FI",
+                  role: "group_residual_current_protection",
+                  placement: "group",
+                  sortOrder: 10,
+                },
+                protectionDevice: {
+                  componentId: "foreign-section",
+                  type: "FI",
+                  ratedCurrentA: 40,
+                  fuseUtilizationCategory: null,
+                  tripCharacteristic: null,
+                  rcdType: "A",
+                  ratedResidualCurrentMa: 30,
+                },
+              }),
+          }),
+        /section does not belong/
+      );
+      const staleSnapshot: DistributionBoardComponentSnapshot = {
+        component: {
+          ...snapshot.component,
+          id: "stale",
+          equipmentIdentifier: "-K-stale",
+        },
+        protectionDevice: null,
+      };
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "user",
+            command:
+              createDistributionBoardComponentInsertProjectCommand(
+                staleSnapshot
+              ),
+          }),
+        ProjectRevisionConflictError
+      );
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command:
+              createDistributionBoardComponentInsertProjectCommand(
+                snapshot
+              ),
+          }),
+        /UNIQUE constraint failed/
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects changed deletes and rolls back late history failures", () => {
+    const context = createTestDatabase();
+    try {
+      const { list } = getListAndSection(context);
+      const snapshot: DistributionBoardComponentSnapshot = {
+        component: {
+          id: "component-change",
+          circuitListId: list.id,
+          sectionId: null,
+          equipmentIdentifier: "-K2",
+          name: "Aktor",
+          role: "auxiliary",
+          placement: "footer",
+          sortOrder: 20,
+        },
+        protectionDevice: null,
+      };
+      const repository =
+        new DistributionBoardComponentStructureProjectCommandRepository(
+          context.db
+        );
+      const inserted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command:
+          createDistributionBoardComponentInsertProjectCommand(
+            snapshot
+          ),
+      });
+      context.db
+        .update(distributionBoardComponents)
+        .set({ name: "Direkt geändert" })
+        .where(eq(distributionBoardComponents.id, snapshot.component.id))
+        .run();
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "undo",
+            historyTargetChangeSetId: new ProjectHistoryRepository(
+              context.db
+            ).getNextCommand("project-1", "undo")?.changeSetId,
+            command: inserted.inverse,
+          }),
+        /changed before deletion/
+      );
+    } finally {
+      context.close();
+    }
+
+    const rollback = createTestDatabase();
+    try {
+      const { list } = getListAndSection(rollback);
+      rollback.sqlite.exec(`
+        CREATE TRIGGER fail_component_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced component history failure');
+        END;
+      `);
+      const repository =
+        new DistributionBoardComponentStructureProjectCommandRepository(
+          rollback.db
+        );
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command:
+              createDistributionBoardComponentInsertProjectCommand({
+                component: {
+                  id: "component-rollback",
+                  circuitListId: list.id,
+                  sectionId: null,
+                  equipmentIdentifier: "-K3",
+                  name: "Aktor",
+                  role: "auxiliary",
+                  placement: "footer",
+                  sortOrder: 30,
+                },
+                protectionDevice: null,
+              }),
+          }),
+        /forced component history failure/
+      );
+      assert.equal(
+        rollback.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(
+            eq(
+              distributionBoardComponents.id,
+              "component-rollback"
+            )
+          )
+          .get(),
+        undefined
+      );
+    } finally {
+      rollback.close();
+    }
+  });
+});

tests/distribution-board-component.test.ts

@@ -7,6 +7,7 @@ import {
   distributionBoardComponentRoles,
 } from "../src/shared/constants/distribution-board-component.js";
 import { circuitGroupCategories } from "../src/shared/constants/circuit-group.js";
+import "./distribution-board-component-structure-project-command.repository.test.js";
 
 describe("distribution board component catalog", () => {
   it("defines the agreed component roles and placement zones", () => {

tests/project-command.service.test.ts

@@ -16,6 +16,7 @@ import { CircuitSectionRenumberProjectCommandRepository } from "../src/db/reposi
 import { CircuitStructureProjectCommandRepository } from "../src/db/repositories/circuit-structure-project-command.repository.js";
 import { DistributionBoardFixtureRepository } from "./support/distribution-board-fixture.js";
 import { DistributionBoardStructureProjectCommandRepository } from "../src/db/repositories/distribution-board-structure-project-command.repository.js";
+import { DistributionBoardComponentStructureProjectCommandRepository } from "../src/db/repositories/distribution-board-component-structure-project-command.repository.js";
 import { ProjectHistoryRepository } from "../src/db/repositories/project-history.repository.js";
 import { ProjectLocationStructureProjectCommandRepository } from "../src/db/repositories/project-location-structure-project-command.repository.js";
 import { ProjectDeviceProjectCommandRepository } from "../src/db/repositories/project-device-project-command.repository.js";
@@ -26,6 +27,7 @@ import { ProjectSettingsProjectCommandRepository } from "../src/db/repositories/
 import { circuitDeviceRows } from "../src/db/schema/circuit-device-rows.js";
 import { circuitSections } from "../src/db/schema/circuit-sections.js";
 import { circuits } from "../src/db/schema/circuits.js";
+import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
 import { projectChangeSets } from "../src/db/schema/project-change-sets.js";
 import { projectDevices } from "../src/db/schema/project-devices.js";
 import { projectRevisions } from "../src/db/schema/project-revisions.js";
@@ -49,6 +51,7 @@ import {
   createDistributionBoardInsertProjectCommand,
   createDistributionBoardStructureSnapshot,
 } from "../src/domain/models/distribution-board-structure-project-command.model.js";
+import { createDistributionBoardComponentInsertProjectCommand } from "../src/domain/models/distribution-board-component-structure-project-command.model.js";
 import {
   createProjectFloorInsertProjectCommand,
   createProjectFloorSnapshot,
@@ -122,6 +125,9 @@ function createService(context: DatabaseContext) {
     new ProjectDeviceRowSyncProjectCommandRepository(context.db),
     new ProjectSettingsProjectCommandRepository(context.db),
     new ProjectStateRestoreCommandRepository(context.db),
+    new DistributionBoardComponentStructureProjectCommandRepository(
+      context.db
+    ),
     new ProjectHistoryRepository(context.db)
   );
 }
@@ -1059,6 +1065,62 @@ describe("project command service", () => {
     }
   });
 
+  it("dispatches distribution-board component insertion and deletion", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const created = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command:
+          createDistributionBoardComponentInsertProjectCommand({
+            component: {
+              id: "component-service",
+              circuitListId: context.db
+                .select()
+                .from(circuitSections)
+                .get()!.circuitListId,
+              sectionId: null,
+              equipmentIdentifier: "-K10",
+              name: "KNX Aktor",
+              role: "auxiliary",
+              placement: "footer",
+              sortOrder: 10,
+            },
+            protectionDevice: null,
+          }),
+      });
+      assert.equal(created.history.currentRevision, 1);
+      assert.ok(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(
+            eq(distributionBoardComponents.id, "component-service")
+          )
+          .get()
+      );
+
+      const undone = createService(context).undo({
+        projectId: "project-1",
+        expectedRevision: 1,
+      });
+      assert.equal(undone.history.currentRevision, 2);
+      assert.equal(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(
+            eq(distributionBoardComponents.id, "component-service")
+          )
+          .get(),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+
   it("dispatches floor and room setup with their persisted inverses", () => {
     const context = createTestDatabase();
     try {

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

@@ -16,6 +16,7 @@ import { CircuitSectionReorderProjectCommandRepository } from "../src/db/reposit
 import { CircuitStructureProjectCommandRepository } from "../src/db/repositories/circuit-structure-project-command.repository.js";
 import { DistributionBoardFixtureRepository } from "./support/distribution-board-fixture.js";
 import { DistributionBoardStructureProjectCommandRepository } from "../src/db/repositories/distribution-board-structure-project-command.repository.js";
+import { DistributionBoardComponentStructureProjectCommandRepository } from "../src/db/repositories/distribution-board-component-structure-project-command.repository.js";
 import { ProjectDeviceProjectCommandRepository } from "../src/db/repositories/project-device-project-command.repository.js";
 import { ProjectDeviceRowSyncProjectCommandRepository } from "../src/db/repositories/project-device-row-sync-project-command.repository.js";
 import { ProjectDeviceStructureProjectCommandRepository } from "../src/db/repositories/project-device-structure-project-command.repository.js";
@@ -191,6 +192,9 @@ function createService(context: DatabaseContext) {
     new ProjectDeviceRowSyncProjectCommandRepository(context.db),
     new ProjectSettingsProjectCommandRepository(context.db),
     new ProjectStateRestoreCommandRepository(context.db),
+    new DistributionBoardComponentStructureProjectCommandRepository(
+      context.db
+    ),
     new ProjectHistoryRepository(context.db)
   );
 }

tests/project-version-history.test.ts

@@ -115,6 +115,22 @@ describe("project version history presentation", () => {
       ),
       "Projekteinstellungen bearbeitet"
     );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(5, {
+          commandType: "distribution-board-component.insert",
+        })
+      ),
+      "Verteilergerät angelegt"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(6, {
+          commandType: "distribution-board-component.delete",
+        })
+      ),
+      "Verteilergerät entfernt"
+    );
     assert.equal(getProjectSnapshotKindLabel("named"), "Benannt");
     assert.equal(
       getProjectSnapshotKindLabel("automatic"),