Add project device structure history

AGENTS.md

@@ -236,6 +236,9 @@ by sorting or moving. Project-device synchronization, disconnect and reconnect
 are persisted as one atomic multi-row command with complete expected/target row
 snapshots, including link and override metadata. Canonical ProjectDevice field
 updates are also persisted and never synchronize linked rows implicitly.
+ProjectDevice insertion/deletion preserves stable device ids. Deletion captures
+complete disconnected snapshots of linked rows so undo can restore only rows
+that have remained unchanged.
 
 Required operations:
 

docs/circuit-list-editor-api.md

@@ -28,14 +28,15 @@ The public dispatcher currently supports `circuit.update`, `circuit.insert`,
 `circuit-device-row.insert`, `circuit-device-row.delete`,
 `circuit-device-row.move`, `circuit-device-row.move-with-new-circuit`,
 `circuit.reorder-section`, `circuit.renumber-section` and
-`project-device.update` and `project-device.sync-rows`, all with schema version
+`project-device.update`, `project-device.insert`, `project-device.delete` and
-`1`. Other command types are rejected. Insert commands contain the complete
+`project-device.sync-rows`, all with schema version `1`. Other command types
-entity or circuit block with stable ids; delete commands include the expected
+are rejected. Insert commands contain the complete entity or circuit block
-parent identity. Circuit snapshots contain zero, one or multiple complete
+with stable ids; delete commands include the expected parent identity. Circuit
-device rows. Move commands contain each row's expected and target circuit plus
+snapshots contain zero, one or multiple complete device rows. Move commands
-its exact expected and target sort order. This makes deletion and moves
+contain each row's expected and target circuit plus its exact expected and
-undoable without generating replacement identities or renumbering circuits.
+target sort order. This makes deletion and moves undoable without generating
-The editor does not consume these endpoints yet.
+replacement identities or renumbering circuits. The editor does not consume
+these endpoints yet.
 
 `circuit-device-row.move` targets existing circuits in the same circuit list.
 `circuit-device-row.move-with-new-circuit` atomically creates exactly one
@@ -68,6 +69,13 @@ and derives its inverse from the persisted device. It validates project
 ownership and never writes linked `CircuitDeviceRow` values; synchronization
 remains a separate explicit command.
 
+`project-device.insert` stores the complete canonical device with a stable id.
+User inserts cannot attach existing rows. `project-device.delete` captures the
+complete device and every currently linked row before deletion. Its inverse
+recreates the same device and reconnects only rows whose complete disconnected
+snapshot still matches; device, links, revision and history transition are
+atomic.
+
 Example:
 
 ```json

docs/current-architecture.md

@@ -117,6 +117,14 @@ gespeicherten Gerät und schreibt Geräteänderung, Revision und Historienstapel
 atomar. Verknüpfte Stromkreiszeilen werden dabei bewusst nicht automatisch
 synchronisiert. Der bestehende ProjectDevice-`PUT`-Endpunkt verwendet diesen
 Command bis zum UI-Cutover noch nicht.
+`project-device.insert` und `project-device.delete` versionieren außerdem den
+Lebenszyklus eines Projektgeräts mit stabiler UUID. Beim Löschen speichert das
+inverse Insert den vollständigen Gerätestand sowie vollständige, nach dem
+Löschen erwartete Snapshots aller zuvor verknüpften Gerätezeilen. Undo setzt
+die Links nur zurück, wenn diese Zeilen weiterhin zum Projekt gehören,
+unverknüpft und vollständig unverändert sind. Gerät, Linkänderungen, Revision
+und Historienstapel teilen dieselbe Transaktion. Die bestehenden Create-,
+Import- und Delete-Endpunkte sind noch nicht umgestellt.
 
 ## Projektgeräte
 

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

@@ -197,13 +197,17 @@ Completed foundation:
   protect local values, links and override metadata against silent stale writes
 - `project-device.update` persists canonical source-device field changes
   independently and never synchronizes linked rows implicitly
+- `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
 
 Remaining constraints before completing persistent history:
 
 - extend the concrete project-scoped command union and executors beyond the
   Circuit field/insert/delete and CircuitDeviceRow
-  field/insert/delete/move, section-reorder/renumber, ProjectDevice field-update
+  field/insert/delete/move, section-reorder/renumber and ProjectDevice
-  and row-sync slices; the generic versioned command envelope is complete
+  field/insert/delete/row-sync slices; the generic versioned command envelope
+  is complete
 - route the remaining structural and destructive domain
   writes through the shared command, revision and stack transaction boundary
 - replace the session-local frontend command stack only after server-side

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

@@ -411,6 +411,8 @@ Implemented foundation:
   local values, links and override metadata without silent overwrites
 - canonical ProjectDevice field updates persist independently with exact
   inverses and never overwrite linked CircuitDeviceRow values implicitly
+- ProjectDevice insert/delete commands preserve stable device ids and restore
+  previously linked rows only from complete unchanged disconnected snapshots
 - revision metadata, change-set payloads and the project counter are committed
   in one SQLite transaction
 - a stale expected revision produces no history writes

package.json

@@ -14,8 +14,8 @@
     "build:api": "tsc -p tsconfig.json",
     "build:web": "next build",
     "start": "node dist/server/index.js",
-    "test": "tsx --test tests/project-device-schema.test.ts tests/project-device-schema-migration.test.ts tests/project-device-placement.service.test.ts tests/project-device-sync.service.test.ts tests/legacy-consumer-migration-planner.test.ts tests/legacy-consumer-migration.repository.test.ts tests/circuit-numbering.service.test.ts tests/circuit-write.rules.test.ts tests/circuit-power-calculation.test.ts tests/circuit-tree.controller.test.ts tests/circuit-grid-insertion.test.ts tests/circuit-grid-safety.test.ts tests/circuit-grid-model.test.ts tests/circuit-grid-projection.test.ts tests/distribution-board.repository.test.ts tests/circuit-device-row-transaction.repository.test.ts tests/project-device-row-sync.repository.test.ts tests/project-device-project-command.repository.test.ts tests/project-device-row-sync-project-command.repository.test.ts tests/circuit-section-transaction.repository.test.ts tests/circuit-section-reorder-project-command.repository.test.ts tests/circuit-section-renumber-project-command.repository.test.ts tests/project-command.model.test.ts tests/project-revision.repository.test.ts tests/circuit-project-command.repository.test.ts tests/circuit-structure-project-command.repository.test.ts tests/circuit-device-row-project-command.repository.test.ts tests/circuit-device-row-structure-project-command.repository.test.ts tests/circuit-device-row-move-project-command.repository.test.ts tests/project-history.repository.test.ts tests/project-command.service.test.ts tests/database-backup.test.ts",
+    "test": "tsx --test tests/project-device-schema.test.ts tests/project-device-schema-migration.test.ts tests/project-device-placement.service.test.ts tests/project-device-sync.service.test.ts tests/legacy-consumer-migration-planner.test.ts tests/legacy-consumer-migration.repository.test.ts tests/circuit-numbering.service.test.ts tests/circuit-write.rules.test.ts tests/circuit-power-calculation.test.ts tests/circuit-tree.controller.test.ts tests/circuit-grid-insertion.test.ts tests/circuit-grid-safety.test.ts tests/circuit-grid-model.test.ts tests/circuit-grid-projection.test.ts tests/distribution-board.repository.test.ts tests/circuit-device-row-transaction.repository.test.ts tests/project-device-row-sync.repository.test.ts tests/project-device-project-command.repository.test.ts tests/project-device-structure-project-command.repository.test.ts tests/project-device-row-sync-project-command.repository.test.ts tests/circuit-section-transaction.repository.test.ts tests/circuit-section-reorder-project-command.repository.test.ts tests/circuit-section-renumber-project-command.repository.test.ts tests/project-command.model.test.ts tests/project-revision.repository.test.ts tests/circuit-project-command.repository.test.ts tests/circuit-structure-project-command.repository.test.ts tests/circuit-device-row-project-command.repository.test.ts tests/circuit-device-row-structure-project-command.repository.test.ts tests/circuit-device-row-move-project-command.repository.test.ts tests/project-history.repository.test.ts tests/project-command.service.test.ts tests/database-backup.test.ts",
-    "test:watch": "tsx --watch --test tests/project-device-schema.test.ts tests/project-device-schema-migration.test.ts tests/project-device-placement.service.test.ts tests/project-device-sync.service.test.ts tests/legacy-consumer-migration-planner.test.ts tests/legacy-consumer-migration.repository.test.ts tests/circuit-numbering.service.test.ts tests/circuit-write.rules.test.ts tests/circuit-power-calculation.test.ts tests/circuit-tree.controller.test.ts tests/circuit-grid-insertion.test.ts tests/circuit-grid-safety.test.ts tests/circuit-grid-model.test.ts tests/circuit-grid-projection.test.ts tests/distribution-board.repository.test.ts tests/circuit-device-row-transaction.repository.test.ts tests/project-device-row-sync.repository.test.ts tests/project-device-project-command.repository.test.ts tests/project-device-row-sync-project-command.repository.test.ts tests/circuit-section-transaction.repository.test.ts tests/circuit-section-reorder-project-command.repository.test.ts tests/circuit-section-renumber-project-command.repository.test.ts tests/project-command.model.test.ts tests/project-revision.repository.test.ts tests/circuit-project-command.repository.test.ts tests/circuit-structure-project-command.repository.test.ts tests/circuit-device-row-project-command.repository.test.ts tests/circuit-device-row-structure-project-command.repository.test.ts tests/circuit-device-row-move-project-command.repository.test.ts tests/project-history.repository.test.ts tests/project-command.service.test.ts tests/database-backup.test.ts",
+    "test:watch": "tsx --watch --test tests/project-device-schema.test.ts tests/project-device-schema-migration.test.ts tests/project-device-placement.service.test.ts tests/project-device-sync.service.test.ts tests/legacy-consumer-migration-planner.test.ts tests/legacy-consumer-migration.repository.test.ts tests/circuit-numbering.service.test.ts tests/circuit-write.rules.test.ts tests/circuit-power-calculation.test.ts tests/circuit-tree.controller.test.ts tests/circuit-grid-insertion.test.ts tests/circuit-grid-safety.test.ts tests/circuit-grid-model.test.ts tests/circuit-grid-projection.test.ts tests/distribution-board.repository.test.ts tests/circuit-device-row-transaction.repository.test.ts tests/project-device-row-sync.repository.test.ts tests/project-device-project-command.repository.test.ts tests/project-device-structure-project-command.repository.test.ts tests/project-device-row-sync-project-command.repository.test.ts tests/circuit-section-transaction.repository.test.ts tests/circuit-section-reorder-project-command.repository.test.ts tests/circuit-section-renumber-project-command.repository.test.ts tests/project-command.model.test.ts tests/project-revision.repository.test.ts tests/circuit-project-command.repository.test.ts tests/circuit-structure-project-command.repository.test.ts tests/circuit-device-row-project-command.repository.test.ts tests/circuit-device-row-structure-project-command.repository.test.ts tests/circuit-device-row-move-project-command.repository.test.ts tests/project-history.repository.test.ts tests/project-command.service.test.ts tests/database-backup.test.ts",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate",
     "db:backup": "tsx scripts/db-backup.ts",

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

@@ -0,0 +1,339 @@
+import {
+  and,
+  asc,
+  eq,
+  inArray,
+  isNull,
+} from "drizzle-orm";
+import type { CircuitDeviceRowSnapshot } from "../../domain/models/circuit-device-row-structure-project-command.model.js";
+import {
+  assertProjectDeviceDeleteProjectCommand,
+  assertProjectDeviceInsertProjectCommand,
+  createProjectDeviceDeleteProjectCommand,
+  createProjectDeviceInsertProjectCommand,
+  projectDeviceDeleteCommandType,
+  projectDeviceInsertCommandType,
+  type ProjectDeviceSnapshot,
+  type ProjectDeviceStructureProjectCommand,
+} from "../../domain/models/project-device-structure-project-command.model.js";
+import type {
+  ExecuteProjectDeviceStructureCommandInput,
+  ProjectDeviceStructureProjectCommandStore,
+} from "../../domain/ports/project-device-structure-project-command.store.js";
+import type { AppDatabase } from "../database-context.js";
+import { circuitDeviceRows } from "../schema/circuit-device-rows.js";
+import { circuitLists } from "../schema/circuit-lists.js";
+import { circuits } from "../schema/circuits.js";
+import { projectDevices } from "../schema/project-devices.js";
+import { projects } from "../schema/projects.js";
+import { toCircuitDeviceRowSnapshot } from "./circuit-device-row-structure.persistence.js";
+import { applyProjectHistoryTransition } from "./project-history.persistence.js";
+import { appendProjectRevision } from "./project-revision.persistence.js";
+
+const circuitDeviceRowSnapshotFields = [
+  "id",
+  "circuitId",
+  "linkedProjectDeviceId",
+  "legacyConsumerId",
+  "sortOrder",
+  "name",
+  "displayName",
+  "phaseType",
+  "connectionKind",
+  "costGroup",
+  "category",
+  "level",
+  "roomId",
+  "roomNumberSnapshot",
+  "roomNameSnapshot",
+  "quantity",
+  "powerPerUnit",
+  "simultaneityFactor",
+  "cosPhi",
+  "remark",
+  "overriddenFields",
+] as const satisfies readonly (keyof CircuitDeviceRowSnapshot)[];
+
+export class ProjectDeviceStructureProjectCommandRepository
+  implements ProjectDeviceStructureProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  execute(input: ExecuteProjectDeviceStructureCommandInput) {
+    return this.database.transaction((tx) => {
+      const inverse = this.applyCommand(
+        tx,
+        input.projectId,
+        input.source,
+        input.command
+      );
+      const revision = appendProjectRevision(tx, {
+        projectId: input.projectId,
+        expectedRevision: input.expectedRevision,
+        source: input.source,
+        description: input.description,
+        actorId: input.actorId,
+        forward: input.command,
+        inverse,
+      });
+      applyProjectHistoryTransition(tx, {
+        projectId: input.projectId,
+        source: input.source,
+        recordedChangeSetId: revision.changeSetId,
+        targetChangeSetId: input.historyTargetChangeSetId,
+      });
+      return { revision, inverse };
+    });
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    projectId: string,
+    source: ExecuteProjectDeviceStructureCommandInput["source"],
+    command: ProjectDeviceStructureProjectCommand
+  ): ProjectDeviceStructureProjectCommand {
+    if (command.type === projectDeviceInsertCommandType) {
+      assertProjectDeviceInsertProjectCommand(command);
+      return this.insert(
+        database,
+        projectId,
+        source,
+        command.payload.projectDevice,
+        command.payload.linkedRows
+      );
+    }
+    if (command.type === projectDeviceDeleteCommandType) {
+      assertProjectDeviceDeleteProjectCommand(command);
+      return this.delete(
+        database,
+        projectId,
+        command.payload.projectDeviceId,
+        command.payload.expectedProjectId
+      );
+    }
+    throw new Error("Unsupported project-device structure command.");
+  }
+
+  private insert(
+    database: AppDatabase,
+    projectId: string,
+    source: ExecuteProjectDeviceStructureCommandInput["source"],
+    snapshot: ProjectDeviceSnapshot,
+    linkedRows: CircuitDeviceRowSnapshot[]
+  ) {
+    if (snapshot.projectId !== projectId) {
+      throw new Error(
+        "Project-device snapshot does not belong to project."
+      );
+    }
+    if (source === "user" && linkedRows.length > 0) {
+      throw new Error(
+        "User project-device inserts cannot reconnect existing rows."
+      );
+    }
+    const project = database
+      .select({ id: projects.id })
+      .from(projects)
+      .where(eq(projects.id, projectId))
+      .get();
+    if (!project) {
+      throw new Error("Project does not exist.");
+    }
+    const existing = database
+      .select({ id: projectDevices.id })
+      .from(projectDevices)
+      .where(eq(projectDevices.id, snapshot.id))
+      .get();
+    if (existing) {
+      throw new Error("Project-device id already exists.");
+    }
+
+    this.assertRestorableRows(database, projectId, linkedRows);
+    database.insert(projectDevices).values(snapshot).run();
+    for (const row of linkedRows) {
+      const updated = database
+        .update(circuitDeviceRows)
+        .set({ linkedProjectDeviceId: snapshot.id })
+        .where(
+          and(
+            eq(circuitDeviceRows.id, row.id),
+            isNull(circuitDeviceRows.linkedProjectDeviceId)
+          )
+        )
+        .run();
+      if (updated.changes !== 1) {
+        throw new Error(
+          "A restored project-device row changed during insertion."
+        );
+      }
+    }
+    return createProjectDeviceDeleteProjectCommand(
+      snapshot.id,
+      projectId
+    );
+  }
+
+  private delete(
+    database: AppDatabase,
+    projectId: string,
+    projectDeviceId: string,
+    expectedProjectId: string
+  ) {
+    if (expectedProjectId !== projectId) {
+      throw new Error(
+        "Project-device delete project does not match command project."
+      );
+    }
+    const projectDevice = database
+      .select()
+      .from(projectDevices)
+      .where(
+        and(
+          eq(projectDevices.id, projectDeviceId),
+          eq(projectDevices.projectId, projectId)
+        )
+      )
+      .get();
+    if (!projectDevice) {
+      throw new Error(
+        "Project device does not belong to project."
+      );
+    }
+    const linkedRows = database
+      .select({
+        row: circuitDeviceRows,
+        projectId: circuitLists.projectId,
+      })
+      .from(circuitDeviceRows)
+      .innerJoin(
+        circuits,
+        eq(circuits.id, circuitDeviceRows.circuitId)
+      )
+      .innerJoin(
+        circuitLists,
+        eq(circuitLists.id, circuits.circuitListId)
+      )
+      .where(
+        eq(
+          circuitDeviceRows.linkedProjectDeviceId,
+          projectDevice.id
+        )
+      )
+      .orderBy(
+        asc(circuitDeviceRows.sortOrder),
+        asc(circuitDeviceRows.id)
+      )
+      .all();
+    if (
+      linkedRows.some((linked) => linked.projectId !== projectId)
+    ) {
+      throw new Error(
+        "Project device has linked rows outside its project."
+      );
+    }
+    const inverse = createProjectDeviceInsertProjectCommand(
+      toProjectDeviceSnapshot(projectDevice),
+      linkedRows.map(({ row }) => ({
+        ...toCircuitDeviceRowSnapshot(row),
+        linkedProjectDeviceId: null,
+      }))
+    );
+
+    const deleted = database
+      .delete(projectDevices)
+      .where(
+        and(
+          eq(projectDevices.id, projectDevice.id),
+          eq(projectDevices.projectId, projectId)
+        )
+      )
+      .run();
+    if (deleted.changes !== 1) {
+      throw new Error("Project device could not be deleted.");
+    }
+    return inverse;
+  }
+
+  private assertRestorableRows(
+    database: AppDatabase,
+    projectId: string,
+    snapshots: CircuitDeviceRowSnapshot[]
+  ) {
+    if (snapshots.length === 0) {
+      return;
+    }
+    const rowIds = snapshots.map((row) => row.id);
+    const persistedRows = database
+      .select({
+        row: circuitDeviceRows,
+        projectId: circuitLists.projectId,
+      })
+      .from(circuitDeviceRows)
+      .innerJoin(
+        circuits,
+        eq(circuits.id, circuitDeviceRows.circuitId)
+      )
+      .innerJoin(
+        circuitLists,
+        eq(circuitLists.id, circuits.circuitListId)
+      )
+      .where(inArray(circuitDeviceRows.id, rowIds))
+      .all();
+    if (
+      persistedRows.length !== snapshots.length ||
+      persistedRows.some(
+        (persisted) => persisted.projectId !== projectId
+      )
+    ) {
+      throw new Error(
+        "One or more restored rows do not belong to project."
+      );
+    }
+    const persistedById = new Map(
+      persistedRows.map(({ row }) => [
+        row.id,
+        toCircuitDeviceRowSnapshot(row),
+      ])
+    );
+    for (const snapshot of snapshots) {
+      const persisted = persistedById.get(snapshot.id);
+      if (
+        !persisted ||
+        !circuitDeviceRowSnapshotFields.every(
+          (field) => persisted[field] === snapshot[field]
+        )
+      ) {
+        throw new Error(
+          "A restored project-device row changed before insertion."
+        );
+      }
+    }
+  }
+}
+
+function toProjectDeviceSnapshot(
+  projectDevice: typeof projectDevices.$inferSelect
+): ProjectDeviceSnapshot {
+  if (
+    projectDevice.phaseType !== "single_phase" &&
+    projectDevice.phaseType !== "three_phase"
+  ) {
+    throw new Error("Persisted project-device phase type is invalid.");
+  }
+  return {
+    id: projectDevice.id,
+    projectId: projectDevice.projectId,
+    name: projectDevice.name,
+    displayName: projectDevice.displayName,
+    phaseType: projectDevice.phaseType,
+    connectionKind: projectDevice.connectionKind,
+    costGroup: projectDevice.costGroup,
+    category: projectDevice.category,
+    quantity: projectDevice.quantity,
+    powerPerUnit: projectDevice.powerPerUnit,
+    simultaneityFactor: projectDevice.simultaneityFactor,
+    cosPhi: projectDevice.cosPhi,
+    remark: projectDevice.remark,
+    voltageV: projectDevice.voltageV,
+  };
+}

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

@@ -24,6 +24,21 @@ export type ProjectDeviceUpdateField =
 export type ProjectDeviceUpdatePatch =
   Partial<ProjectDeviceUpdateValues>;
 
+export const projectDeviceUpdateFields = [
+  "name",
+  "displayName",
+  "phaseType",
+  "connectionKind",
+  "costGroup",
+  "category",
+  "quantity",
+  "powerPerUnit",
+  "simultaneityFactor",
+  "cosPhi",
+  "remark",
+  "voltageV",
+] as const satisfies readonly ProjectDeviceUpdateField[];
+
 export interface ProjectDeviceUpdateFieldChange<
   TField extends ProjectDeviceUpdateField = ProjectDeviceUpdateField,
 > {
@@ -173,20 +188,9 @@ function assertProjectDeviceUpdateFieldValue(
 function isProjectDeviceUpdateField(
   value: string
 ): value is ProjectDeviceUpdateField {
-  return [
+  return projectDeviceUpdateFields.includes(
-    "name",
+    value as ProjectDeviceUpdateField
-    "displayName",
+  );
-    "phaseType",
-    "connectionKind",
-    "costGroup",
-    "category",
-    "quantity",
-    "powerPerUnit",
-    "simultaneityFactor",
-    "cosPhi",
-    "remark",
-    "voltageV",
-  ].includes(value);
 }
 
 function isPlainObject(value: unknown): value is Record<string, unknown> {

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

@@ -0,0 +1,171 @@
+import {
+  assertCircuitDeviceRowInsertProjectCommand,
+  circuitDeviceRowInsertCommandType,
+  circuitDeviceRowStructureCommandSchemaVersion,
+  type CircuitDeviceRowSnapshot,
+} from "./circuit-device-row-structure-project-command.model.js";
+import {
+  assertProjectDeviceUpdateProjectCommand,
+  projectDeviceUpdateCommandSchemaVersion,
+  projectDeviceUpdateCommandType,
+  projectDeviceUpdateFields,
+  type ProjectDeviceUpdateValues,
+} from "./project-device-project-command.model.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const projectDeviceInsertCommandType =
+  "project-device.insert" as const;
+export const projectDeviceDeleteCommandType =
+  "project-device.delete" as const;
+export const projectDeviceStructureCommandSchemaVersion = 1 as const;
+
+export interface ProjectDeviceSnapshot
+  extends ProjectDeviceUpdateValues {
+  id: string;
+  projectId: string;
+}
+
+export interface ProjectDeviceInsertCommandPayload {
+  projectDevice: ProjectDeviceSnapshot;
+  linkedRows: CircuitDeviceRowSnapshot[];
+}
+
+export interface ProjectDeviceDeleteCommandPayload {
+  projectDeviceId: string;
+  expectedProjectId: string;
+}
+
+export interface ProjectDeviceInsertProjectCommand
+  extends SerializedProjectCommand<ProjectDeviceInsertCommandPayload> {
+  schemaVersion: typeof projectDeviceStructureCommandSchemaVersion;
+  type: typeof projectDeviceInsertCommandType;
+}
+
+export interface ProjectDeviceDeleteProjectCommand
+  extends SerializedProjectCommand<ProjectDeviceDeleteCommandPayload> {
+  schemaVersion: typeof projectDeviceStructureCommandSchemaVersion;
+  type: typeof projectDeviceDeleteCommandType;
+}
+
+export type ProjectDeviceStructureProjectCommand =
+  | ProjectDeviceInsertProjectCommand
+  | ProjectDeviceDeleteProjectCommand;
+
+export function createProjectDeviceInsertProjectCommand(
+  projectDevice: ProjectDeviceSnapshot,
+  linkedRows: CircuitDeviceRowSnapshot[] = []
+): ProjectDeviceInsertProjectCommand {
+  const command: ProjectDeviceInsertProjectCommand = {
+    schemaVersion: projectDeviceStructureCommandSchemaVersion,
+    type: projectDeviceInsertCommandType,
+    payload: { projectDevice, linkedRows },
+  };
+  assertProjectDeviceInsertProjectCommand(command);
+  return command;
+}
+
+export function createProjectDeviceDeleteProjectCommand(
+  projectDeviceId: string,
+  expectedProjectId: string
+): ProjectDeviceDeleteProjectCommand {
+  const command: ProjectDeviceDeleteProjectCommand = {
+    schemaVersion: projectDeviceStructureCommandSchemaVersion,
+    type: projectDeviceDeleteCommandType,
+    payload: { projectDeviceId, expectedProjectId },
+  };
+  assertProjectDeviceDeleteProjectCommand(command);
+  return command;
+}
+
+export function assertProjectDeviceInsertProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is ProjectDeviceInsertProjectCommand {
+  if (
+    command.schemaVersion !== projectDeviceStructureCommandSchemaVersion ||
+    command.type !== projectDeviceInsertCommandType
+  ) {
+    throw new Error("Unsupported project-device insert command.");
+  }
+  if (!isPlainObject(command.payload)) {
+    throw new Error("Project-device insert payload must be an object.");
+  }
+  const { projectDevice, linkedRows } = command.payload;
+  if (!isPlainObject(projectDevice)) {
+    throw new Error(
+      "Project-device insert command requires a project device."
+    );
+  }
+  assertNonEmptyString(projectDevice.id, "projectDevice.id");
+  assertNonEmptyString(
+    projectDevice.projectId,
+    "projectDevice.projectId"
+  );
+  assertProjectDeviceUpdateProjectCommand({
+    schemaVersion: projectDeviceUpdateCommandSchemaVersion,
+    type: projectDeviceUpdateCommandType,
+    payload: {
+      projectDeviceId: projectDevice.id,
+      changes: projectDeviceUpdateFields.map((field) => ({
+        field,
+        value: projectDevice[field],
+      })),
+    },
+  });
+
+  if (!Array.isArray(linkedRows)) {
+    throw new Error(
+      "Project-device insert linkedRows must be an array."
+    );
+  }
+  const rowIds = new Set<string>();
+  for (const row of linkedRows) {
+    assertCircuitDeviceRowInsertProjectCommand({
+      schemaVersion: circuitDeviceRowStructureCommandSchemaVersion,
+      type: circuitDeviceRowInsertCommandType,
+      payload: { row },
+    });
+    if (row.linkedProjectDeviceId !== null) {
+      throw new Error(
+        "Restored project-device rows must currently be disconnected."
+      );
+    }
+    if (rowIds.has(row.id)) {
+      throw new Error(
+        "Project-device insert command contains duplicate row ids."
+      );
+    }
+    rowIds.add(row.id);
+  }
+}
+
+export function assertProjectDeviceDeleteProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is ProjectDeviceDeleteProjectCommand {
+  if (
+    command.schemaVersion !== projectDeviceStructureCommandSchemaVersion ||
+    command.type !== projectDeviceDeleteCommandType
+  ) {
+    throw new Error("Unsupported project-device delete command.");
+  }
+  if (!isPlainObject(command.payload)) {
+    throw new Error("Project-device delete payload must be an object.");
+  }
+  assertNonEmptyString(
+    command.payload.projectDeviceId,
+    "projectDeviceId"
+  );
+  assertNonEmptyString(
+    command.payload.expectedProjectId,
+    "expectedProjectId"
+  );
+}
+
+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/project-device-structure-project-command.store.ts

@@ -0,0 +1,26 @@
+import type { ProjectDeviceStructureProjectCommand } from "../models/project-device-structure-project-command.model.js";
+import type {
+  AppendedProjectRevision,
+  ProjectRevisionSource,
+} from "./project-revision.store.js";
+
+export interface ExecuteProjectDeviceStructureCommandInput {
+  projectId: string;
+  expectedRevision: number;
+  source: ProjectRevisionSource;
+  description?: string;
+  actorId?: string;
+  historyTargetChangeSetId?: string;
+  command: ProjectDeviceStructureProjectCommand;
+}
+
+export interface ExecutedProjectDeviceStructureCommand {
+  revision: AppendedProjectRevision;
+  inverse: ProjectDeviceStructureProjectCommand;
+}
+
+export interface ProjectDeviceStructureProjectCommandStore {
+  execute(
+    input: ExecuteProjectDeviceStructureCommandInput
+  ): ExecutedProjectDeviceStructureCommand;
+}

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

@@ -45,6 +45,12 @@ import {
   assertProjectDeviceUpdateProjectCommand,
   projectDeviceUpdateCommandType,
 } from "../models/project-device-project-command.model.js";
+import {
+  assertProjectDeviceDeleteProjectCommand,
+  assertProjectDeviceInsertProjectCommand,
+  projectDeviceDeleteCommandType,
+  projectDeviceInsertCommandType,
+} from "../models/project-device-structure-project-command.model.js";
 import type { CircuitDeviceRowProjectCommandStore } from "../ports/circuit-device-row-project-command.store.js";
 import type { CircuitDeviceRowMoveProjectCommandStore } from "../ports/circuit-device-row-move-project-command.store.js";
 import type { CircuitDeviceRowStructureProjectCommandStore } from "../ports/circuit-device-row-structure-project-command.store.js";
@@ -64,6 +70,7 @@ import type {
 } from "../ports/project-history.store.js";
 import type { ProjectDeviceProjectCommandStore } from "../ports/project-device-project-command.store.js";
 import type { ProjectDeviceRowSyncProjectCommandStore } from "../ports/project-device-row-sync-project-command.store.js";
+import type { ProjectDeviceStructureProjectCommandStore } from "../ports/project-device-structure-project-command.store.js";
 import type { ProjectRevisionSource } from "../ports/project-revision.store.js";
 
 interface DispatchProjectCommandInput {
@@ -85,6 +92,7 @@ export class ProjectCommandService implements ProjectCommandExecutor {
     private readonly circuitStructureStore: CircuitStructureProjectCommandStore,
     private readonly circuitSectionReorderStore: CircuitSectionReorderProjectCommandStore,
     private readonly circuitSectionRenumberStore: CircuitSectionRenumberProjectCommandStore,
+    private readonly projectDeviceStructureStore: ProjectDeviceStructureProjectCommandStore,
     private readonly projectDeviceStore: ProjectDeviceProjectCommandStore,
     private readonly projectDeviceRowSyncStore: ProjectDeviceRowSyncProjectCommandStore,
     private readonly historyStore: ProjectHistoryStore
@@ -238,6 +246,20 @@ export class ProjectCommandService implements ProjectCommandExecutor {
           command: input.command,
         }).revision;
       }
+      case projectDeviceInsertCommandType: {
+        assertProjectDeviceInsertProjectCommand(input.command);
+        return this.projectDeviceStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case projectDeviceDeleteCommandType: {
+        assertProjectDeviceDeleteProjectCommand(input.command);
+        return this.projectDeviceStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
       default:
         throw new Error(
           `Unsupported project command type: ${input.command.type}.`

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

@@ -9,6 +9,7 @@ import { CircuitStructureProjectCommandRepository } from "../../db/repositories/
 import { ProjectHistoryRepository } from "../../db/repositories/project-history.repository.js";
 import { ProjectDeviceProjectCommandRepository } from "../../db/repositories/project-device-project-command.repository.js";
 import { ProjectDeviceRowSyncProjectCommandRepository } from "../../db/repositories/project-device-row-sync-project-command.repository.js";
+import { ProjectDeviceStructureProjectCommandRepository } from "../../db/repositories/project-device-structure-project-command.repository.js";
 import { ProjectCommandService } from "../../domain/services/project-command.service.js";
 
 export const circuitProjectCommandStore = new CircuitProjectCommandRepository(db);
@@ -24,6 +25,8 @@ export const circuitSectionReorderProjectCommandStore =
   new CircuitSectionReorderProjectCommandRepository(db);
 export const circuitSectionRenumberProjectCommandStore =
   new CircuitSectionRenumberProjectCommandRepository(db);
+export const projectDeviceStructureProjectCommandStore =
+  new ProjectDeviceStructureProjectCommandRepository(db);
 export const projectDeviceProjectCommandStore =
   new ProjectDeviceProjectCommandRepository(db);
 export const projectDeviceRowSyncProjectCommandStore =
@@ -37,6 +40,7 @@ export const projectCommandService = new ProjectCommandService(
   circuitStructureProjectCommandStore,
   circuitSectionReorderProjectCommandStore,
   circuitSectionRenumberProjectCommandStore,
+  projectDeviceStructureProjectCommandStore,
   projectDeviceProjectCommandStore,
   projectDeviceRowSyncProjectCommandStore,
   projectHistoryStore

tests/project-command.model.test.ts

@@ -46,6 +46,10 @@ import {
   assertProjectDeviceUpdateProjectCommand,
   createProjectDeviceUpdateProjectCommand,
 } from "../src/domain/models/project-device-project-command.model.js";
+import {
+  createProjectDeviceDeleteProjectCommand,
+  createProjectDeviceInsertProjectCommand,
+} from "../src/domain/models/project-device-structure-project-command.model.js";
 
 describe("serialized project commands", () => {
   it("round-trips a versioned command envelope", () => {
@@ -353,6 +357,89 @@ describe("project-device update project commands", () => {
   });
 });
 
+describe("project-device structure project commands", () => {
+  const projectDevice = {
+    id: "project-device-1",
+    projectId: "project-1",
+    name: "Luminaire",
+    displayName: "Office lighting",
+    phaseType: "single_phase" as const,
+    connectionKind: "fixed",
+    costGroup: "440",
+    category: "lighting",
+    quantity: 4,
+    powerPerUnit: 0.04,
+    simultaneityFactor: 0.8,
+    cosPhi: 0.95,
+    remark: "DALI",
+    voltageV: 230,
+  };
+  const disconnectedRow = {
+    id: "row-1",
+    circuitId: "circuit-1",
+    linkedProjectDeviceId: null,
+    legacyConsumerId: null,
+    sortOrder: 10,
+    name: "Luminaire",
+    displayName: "Local lighting",
+    phaseType: "single_phase",
+    connectionKind: "fixed",
+    costGroup: "440",
+    category: "lighting",
+    level: null,
+    roomId: null,
+    roomNumberSnapshot: null,
+    roomNameSnapshot: null,
+    quantity: 4,
+    powerPerUnit: 0.04,
+    simultaneityFactor: 0.8,
+    cosPhi: 0.95,
+    remark: "DALI",
+    overriddenFields: '["displayName"]',
+  };
+
+  it("captures complete device and disconnected-row restore snapshots", () => {
+    const insert = createProjectDeviceInsertProjectCommand(
+      projectDevice,
+      [disconnectedRow]
+    );
+    const remove = createProjectDeviceDeleteProjectCommand(
+      projectDevice.id,
+      projectDevice.projectId
+    );
+
+    assert.deepEqual(insert.payload, {
+      projectDevice,
+      linkedRows: [disconnectedRow],
+    });
+    assert.deepEqual(remove.payload, {
+      projectDeviceId: "project-device-1",
+      expectedProjectId: "project-1",
+    });
+  });
+
+  it("rejects invalid device values and rows that are already linked", () => {
+    assert.throws(
+      () =>
+        createProjectDeviceInsertProjectCommand({
+          ...projectDevice,
+          quantity: -1,
+        }),
+      /outside its allowed range/
+    );
+    assert.throws(
+      () =>
+        createProjectDeviceInsertProjectCommand(projectDevice, [
+          {
+            ...disconnectedRow,
+            linkedProjectDeviceId: "project-device-1",
+          },
+        ]),
+      /must currently be disconnected/
+    );
+  });
+});
+
 describe("circuit device-row structure project commands", () => {
   const row = {
     id: "row-1",

tests/project-command.service.test.ts

@@ -18,6 +18,7 @@ import { DistributionBoardRepository } from "../src/db/repositories/distribution
 import { ProjectHistoryRepository } from "../src/db/repositories/project-history.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";
 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";
@@ -39,6 +40,7 @@ import { createCircuitSectionRenumberProjectCommand } from "../src/domain/models
 import { createCircuitInsertProjectCommand } from "../src/domain/models/circuit-structure-project-command.model.js";
 import { createProjectDeviceRowSyncProjectCommand } from "../src/domain/models/project-device-row-sync-project-command.model.js";
 import { createProjectDeviceUpdateProjectCommand } from "../src/domain/models/project-device-project-command.model.js";
+import { createProjectDeviceInsertProjectCommand } from "../src/domain/models/project-device-structure-project-command.model.js";
 import { ProjectCommandService } from "../src/domain/services/project-command.service.js";
 
 function createTestDatabase(): DatabaseContext {
@@ -95,6 +97,7 @@ function createService(context: DatabaseContext) {
     new CircuitStructureProjectCommandRepository(context.db),
     new CircuitSectionReorderProjectCommandRepository(context.db),
     new CircuitSectionRenumberProjectCommandRepository(context.db),
+    new ProjectDeviceStructureProjectCommandRepository(context.db),
     new ProjectDeviceProjectCommandRepository(context.db),
     new ProjectDeviceRowSyncProjectCommandRepository(context.db),
     new ProjectHistoryRepository(context.db)
@@ -325,6 +328,58 @@ describe("project command service", () => {
     }
   });
 
+  it("dispatches project-device insertion and deletion", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const inserted = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command: createProjectDeviceInsertProjectCommand({
+          id: "project-device-new",
+          projectId: "project-1",
+          name: "Socket",
+          displayName: "Office socket",
+          phaseType: "single_phase",
+          connectionKind: null,
+          costGroup: "440",
+          category: "socket",
+          quantity: 2,
+          powerPerUnit: 0.2,
+          simultaneityFactor: 0.5,
+          cosPhi: null,
+          remark: null,
+          voltageV: 230,
+        }),
+      });
+      assert.equal(inserted.history.undoDepth, 1);
+      assert.equal(
+        context.db
+          .select()
+          .from(projectDevices)
+          .where(eq(projectDevices.id, "project-device-new"))
+          .get()?.displayName,
+        "Office socket"
+      );
+
+      const undone = createService(context).undo({
+        projectId: "project-1",
+        expectedRevision: 1,
+      });
+      assert.equal(undone.history.redoDepth, 1);
+      assert.equal(
+        context.db
+          .select()
+          .from(projectDevices)
+          .where(eq(projectDevices.id, "project-device-new"))
+          .get(),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+
   it("rejects stale undo and preserves the domain value and stack", () => {
     const context = createTestDatabase();
     try {

tests/project-device-structure-project-command.repository.test.ts

@@ -0,0 +1,503 @@
+import path from "node:path";
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { asc, eq } from "drizzle-orm";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import {
+  createDatabaseContext,
+  type DatabaseContext,
+} from "../src/db/database-context.js";
+import { DistributionBoardRepository } from "../src/db/repositories/distribution-board.repository.js";
+import { ProjectDeviceStructureProjectCommandRepository } from "../src/db/repositories/project-device-structure-project-command.repository.js";
+import { ProjectHistoryRepository } from "../src/db/repositories/project-history.repository.js";
+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 { projectDevices } from "../src/db/schema/project-devices.js";
+import { projectRevisions } from "../src/db/schema/project-revisions.js";
+import { projects } from "../src/db/schema/projects.js";
+import {
+  createProjectDeviceDeleteProjectCommand,
+  createProjectDeviceInsertProjectCommand,
+  type ProjectDeviceSnapshot,
+} from "../src/domain/models/project-device-structure-project-command.model.js";
+
+function newProjectDeviceSnapshot(): ProjectDeviceSnapshot {
+  return {
+    id: "project-device-new",
+    projectId: "project-1",
+    name: "Socket",
+    displayName: "Office socket",
+    phaseType: "single_phase",
+    connectionKind: null,
+    costGroup: "440",
+    category: "socket",
+    quantity: 2,
+    powerPerUnit: 0.2,
+    simultaneityFactor: 0.5,
+    cosPhi: null,
+    remark: null,
+    voltageV: 230,
+  };
+}
+
+function createTestDatabase(): DatabaseContext {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  context.db
+    .insert(projects)
+    .values([
+      { id: "project-1", name: "Test project" },
+      { id: "project-2", name: "Other project" },
+    ])
+    .run();
+  const boards = new DistributionBoardRepository(context.db);
+  const board = boards.createWithCircuitListAndDefaultSections(
+    "project-1",
+    "UV-01"
+  );
+  const foreignBoard = boards.createWithCircuitListAndDefaultSections(
+    "project-2",
+    "UV-02"
+  );
+  const section = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.circuitListId, board.id))
+    .get();
+  const foreignSection = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.circuitListId, foreignBoard.id))
+    .get();
+  assert.ok(section);
+  assert.ok(foreignSection);
+
+  context.db
+    .insert(projectDevices)
+    .values([
+      {
+        id: "project-device-1",
+        projectId: "project-1",
+        name: "Luminaire",
+        displayName: "Office lighting",
+        phaseType: "single_phase",
+        connectionKind: "fixed",
+        costGroup: "440",
+        category: "lighting",
+        quantity: 4,
+        powerPerUnit: 0.04,
+        simultaneityFactor: 0.8,
+        cosPhi: 0.95,
+        remark: "DALI",
+        voltageV: 230,
+      },
+      {
+        id: "project-device-foreign",
+        projectId: "project-2",
+        name: "Foreign device",
+        displayName: "Foreign device",
+        phaseType: "three_phase",
+        quantity: 1,
+        powerPerUnit: 1,
+        simultaneityFactor: 1,
+      },
+    ])
+    .run();
+  context.db
+    .insert(circuits)
+    .values([
+      {
+        id: "circuit-1",
+        circuitListId: board.id,
+        sectionId: section.id,
+        equipmentIdentifier: "-1F1",
+        sortOrder: 10,
+      },
+      {
+        id: "circuit-foreign",
+        circuitListId: foreignBoard.id,
+        sectionId: foreignSection.id,
+        equipmentIdentifier: "-1F1",
+        sortOrder: 10,
+      },
+    ])
+    .run();
+  context.db
+    .insert(circuitDeviceRows)
+    .values([
+      {
+        id: "row-1",
+        circuitId: "circuit-1",
+        linkedProjectDeviceId: "project-device-1",
+        sortOrder: 10,
+        name: "Luminaire",
+        displayName: "Local row 1",
+        phaseType: "single_phase",
+        quantity: 1,
+        powerPerUnit: 0.03,
+        simultaneityFactor: 1,
+        overriddenFields: '["displayName","quantity"]',
+      },
+      {
+        id: "row-2",
+        circuitId: "circuit-1",
+        linkedProjectDeviceId: "project-device-1",
+        sortOrder: 20,
+        name: "Luminaire",
+        displayName: "Local row 2",
+        phaseType: "single_phase",
+        quantity: 2,
+        powerPerUnit: 0.03,
+        simultaneityFactor: 1,
+        overriddenFields: '["displayName"]',
+      },
+    ])
+    .run();
+  return context;
+}
+
+function getProjectDevice(
+  context: DatabaseContext,
+  id: string
+) {
+  return context.db
+    .select()
+    .from(projectDevices)
+    .where(eq(projectDevices.id, id))
+    .get();
+}
+
+function getLinkedRowState(context: DatabaseContext) {
+  return context.db
+    .select({
+      id: circuitDeviceRows.id,
+      linkedProjectDeviceId:
+        circuitDeviceRows.linkedProjectDeviceId,
+      displayName: circuitDeviceRows.displayName,
+      quantity: circuitDeviceRows.quantity,
+      overriddenFields: circuitDeviceRows.overriddenFields,
+    })
+    .from(circuitDeviceRows)
+    .where(eq(circuitDeviceRows.circuitId, "circuit-1"))
+    .orderBy(asc(circuitDeviceRows.id))
+    .all();
+}
+
+describe("project-device structure project-command repository", () => {
+  it("inserts a stable project device and supports undo and redo", () => {
+    const context = createTestDatabase();
+    try {
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      const command = createProjectDeviceInsertProjectCommand(
+        newProjectDeviceSnapshot()
+      );
+      const inserted = store.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.equal(
+        getProjectDevice(context, "project-device-new")
+          ?.displayName,
+        "Office socket"
+      );
+
+      store.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId:
+          inserted.revision.changeSetId,
+        command: inserted.inverse,
+      });
+      assert.equal(
+        getProjectDevice(context, "project-device-new"),
+        undefined
+      );
+
+      store.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "redo",
+        historyTargetChangeSetId:
+          inserted.revision.changeSetId,
+        command,
+      });
+      assert.deepEqual(
+        new ProjectHistoryRepository(context.db).getState(
+          "project-1"
+        ),
+        {
+          projectId: "project-1",
+          currentRevision: 3,
+          undoDepth: 1,
+          redoDepth: 0,
+          undoChangeSetId: inserted.revision.changeSetId,
+          redoChangeSetId: null,
+        }
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("deletes a device and restores its exact linked rows", () => {
+    const context = createTestDatabase();
+    try {
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      const beforeRows = getLinkedRowState(context);
+      const command = createProjectDeviceDeleteProjectCommand(
+        "project-device-1",
+        "project-1"
+      );
+      const deleted = store.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.equal(
+        getProjectDevice(context, "project-device-1"),
+        undefined
+      );
+      assert.deepEqual(
+        getLinkedRowState(context).map(
+          (row) => row.linkedProjectDeviceId
+        ),
+        [null, null]
+      );
+
+      store.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId:
+          deleted.revision.changeSetId,
+        command: deleted.inverse,
+      });
+      assert.equal(
+        getProjectDevice(context, "project-device-1")
+          ?.displayName,
+        "Office lighting"
+      );
+      assert.deepEqual(getLinkedRowState(context), beforeRows);
+
+      store.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "redo",
+        historyTargetChangeSetId:
+          deleted.revision.changeSetId,
+        command,
+      });
+      assert.deepEqual(
+        getLinkedRowState(context).map(
+          (row) => row.linkedProjectDeviceId
+        ),
+        [null, null]
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects unsafe user links, duplicate ids and foreign deletes", () => {
+    const context = createTestDatabase();
+    try {
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      const disconnectedRow = context.db
+        .select()
+        .from(circuitDeviceRows)
+        .where(eq(circuitDeviceRows.id, "row-1"))
+        .get();
+      assert.ok(disconnectedRow);
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createProjectDeviceInsertProjectCommand(
+              newProjectDeviceSnapshot(),
+              [
+                {
+                  ...disconnectedRow,
+                  linkedProjectDeviceId: null,
+                },
+              ]
+            ),
+          }),
+        /cannot reconnect existing rows/
+      );
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createProjectDeviceInsertProjectCommand({
+              ...newProjectDeviceSnapshot(),
+              id: "project-device-1",
+            }),
+          }),
+        /id already exists/
+      );
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createProjectDeviceDeleteProjectCommand(
+              "project-device-foreign",
+              "project-1"
+            ),
+          }),
+        /does not belong to project/
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("refuses undo when a disconnected row changed", () => {
+    const context = createTestDatabase();
+    try {
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      const deleted = store.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createProjectDeviceDeleteProjectCommand(
+          "project-device-1",
+          "project-1"
+        ),
+      });
+      context.db
+        .update(circuitDeviceRows)
+        .set({ displayName: "Changed while disconnected" })
+        .where(eq(circuitDeviceRows.id, "row-1"))
+        .run();
+
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "undo",
+            historyTargetChangeSetId:
+              deleted.revision.changeSetId,
+            command: deleted.inverse,
+          }),
+        /row changed before insertion/
+      );
+      assert.equal(
+        getProjectDevice(context, "project-device-1"),
+        undefined
+      );
+      assert.deepEqual(
+        getLinkedRowState(context).map(
+          (row) => row.linkedProjectDeviceId
+        ),
+        [null, null]
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        1
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back deletion, disconnected links and history together", () => {
+    const context = createTestDatabase();
+    try {
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_project_device_structure_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced project-device structure history failure');
+        END;
+      `);
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      const beforeRows = getLinkedRowState(context);
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createProjectDeviceDeleteProjectCommand(
+              "project-device-1",
+              "project-1"
+            ),
+          }),
+        /forced project-device structure history failure/
+      );
+      assert.equal(
+        getProjectDevice(context, "project-device-1")
+          ?.displayName,
+        "Office lighting"
+      );
+      assert.deepEqual(getLinkedRowState(context), beforeRows);
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back insertion for a stale project revision", () => {
+    const context = createTestDatabase();
+    try {
+      const store =
+        new ProjectDeviceStructureProjectCommandRepository(
+          context.db
+        );
+      assert.throws(
+        () =>
+          store.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "user",
+            command: createProjectDeviceInsertProjectCommand(
+              newProjectDeviceSnapshot()
+            ),
+          }),
+        /at revision 0, expected 1/
+      );
+      assert.equal(
+        getProjectDevice(context, "project-device-new"),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+});