Persist circuit group renumbering

AGENTS.md

@@ -317,6 +317,10 @@ components; populated deletion remains a separate confirmed command.
 `circuit-group.reorder` requires a complete expected/target sort assignment for
 every group in one circuit list. It changes only sort positions and never
 renumbers groups, prefixes or circuits.
+Explicit group-number changes use `circuit-group.renumber`. The command carries
+the complete expected/target group, circuit-BMK and optional group-component
+BMK plan, applies swaps through collision-safe temporary values and preserves
+circuit suffixes. Undo/Redo uses the exact inverse plan.
 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

@@ -313,8 +313,13 @@ Revision und einen Undo/Redo-Schritt.
 `src/domain/services/circuit-group-renumbering.ts` plant explizite
 Gruppennummerierungen deterministisch. Der reine Plan erhält
 Stromkreis-Endnummern, leitet Gruppenpräfixe und optionale `.0`-Komponenten-BMKs
-neu ab und prüft Nummerntausch sowie Kollisionen mit unveränderten Gruppen. Die
-persistente Ausführung dieses Plans folgt als eigener Command.
+neu ab und prüft Nummerntausch sowie Kollisionen mit unveränderten Gruppen.
+`circuit-group.renumber` führt diesen Plan über die gemeinsame
+Projekt-Command-Transaktion aus. Vor dem Schreiben müssen alle betroffenen
+Gruppen, Stromkreise und Gruppenkomponenten exakt dem erwarteten Zustand
+entsprechen. Nummerntausch verwendet kollisionsfreie temporäre Präfixe und
+BMKs über beide BMK-Tabellen; anschließend werden alle Zielwerte finalisiert.
+Der vollständige inverse Plan ermöglicht dauerhaftes Undo/Redo.
 `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

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

@@ -26,7 +26,7 @@ requirements and intended sequencing, not proof of implementation.
 - [x] Phase C2b1: empty-group insert/update/delete commands.
 - [x] Phase C2b2: complete group reorder command.
 - [x] Phase D1a: deterministic collision-aware group-renumber plan.
-- [ ] Phase D1b: persistent collision-safe group-renumber command.
+- [x] Phase D1b: persistent collision-safe group-renumber command.
 - [ ] Phase D2: same-category cross-group circuit moves.
 - [ ] Phase D3: confirmed populated-group deletion.
 - [ ] Phase E: editor projection and editing.

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

@@ -662,9 +662,8 @@ Acceptance:
 
 ### D. Group Numbering and Circuit Moves
 
-Status: In progress. The deterministic renumber planner D1a is complete;
-persistent execution D1b, cross-group moves D2 and populated deletion D3
-remain pending.
+Status: In progress. Deterministic planning D1a and persistent execution D1b
+are complete; cross-group moves D2 and populated deletion D3 remain pending.
 
 - implement nested identifier generation
 - support same-category cross-group circuit moves
@@ -680,6 +679,17 @@ Implemented in D1a:
 - collisions with unchanged groups, no-op mappings and mismatched current BMKs
   are rejected before persistence
 
+Implemented in D1b:
+
+- `circuit-group.renumber` persists the complete expected/target plan as one
+  project revision
+- group-number swaps use collision-safe temporary group identities and BMKs
+  across both circuit and component tables
+- every current circuit and group component must be included unchanged before
+  execution starts
+- Undo/Redo uses the exact inverse plan; late revision/history failures roll
+  back every group, prefix and BMK
+
 Acceptance:
 
 - target identifiers use highest suffix plus one

src/db/repositories/circuit-group-renumber-project-command.repository.ts

@@ -0,0 +1,348 @@
+import { and, eq } from "drizzle-orm";
+import {
+  assertCircuitGroupRenumberProjectCommand,
+  createCircuitGroupRenumberProjectCommand,
+  type CircuitGroupRenumberProjectCommand,
+} from "../../domain/models/circuit-group-renumber-project-command.model.js";
+import type { CircuitGroupRenumberProjectCommandStore } from "../../domain/ports/circuit-group-renumber-project-command.store.js";
+import type { ExecuteCircuitGroupRenumberCommandInput } from "../../domain/ports/circuit-group-renumber-project-command.store.js";
+import type { CircuitGroupRenumberPlan } from "../../domain/services/circuit-group-renumbering.js";
+import type { AppDatabase } from "../database-context.js";
+import { circuitLists } from "../schema/circuit-lists.js";
+import { circuitSections } from "../schema/circuit-sections.js";
+import { circuits } from "../schema/circuits.js";
+import { distributionBoardComponents } from "../schema/distribution-board-components.js";
+import { executeProjectCommandTransaction } from "./project-command-transaction.persistence.js";
+
+export class CircuitGroupRenumberProjectCommandRepository
+  implements CircuitGroupRenumberProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  execute(input: ExecuteCircuitGroupRenumberCommandInput) {
+    assertCircuitGroupRenumberProjectCommand(input.command);
+    return executeProjectCommandTransaction(
+      this.database,
+      input,
+      (tx) => this.applyCommand(tx, input.projectId, input.command)
+    );
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    projectId: string,
+    command: CircuitGroupRenumberProjectCommand
+  ) {
+    const { circuitListId, groups } = command.payload;
+    this.assertCurrentState(database, projectId, circuitListId, groups);
+    const inverse = createCircuitGroupRenumberProjectCommand(
+      circuitListId,
+      invertPlan(groups)
+    );
+    const occupiedIdentifiers = new Set(
+      [
+        ...database
+          .select({ value: circuits.equipmentIdentifier })
+          .from(circuits)
+          .where(eq(circuits.circuitListId, circuitListId))
+          .all(),
+        ...database
+          .select({ value: distributionBoardComponents.equipmentIdentifier })
+          .from(distributionBoardComponents)
+          .where(
+            eq(distributionBoardComponents.circuitListId, circuitListId)
+          )
+          .all(),
+      ].map(({ value }) => normalizeIdentifier(value))
+    );
+    const temporaryIdentifiers = new Map<string, string>();
+    for (const group of groups) {
+      for (const assignment of [
+        ...group.circuits.map((entry) => ({
+          id: entry.circuitId,
+          expected: entry.expectedEquipmentIdentifier,
+          table: "circuit" as const,
+        })),
+        ...group.components.map((entry) => ({
+          id: entry.componentId,
+          expected: entry.expectedEquipmentIdentifier,
+          table: "component" as const,
+        })),
+      ]) {
+        const key = `${assignment.table}:${assignment.id}`;
+        const temporary = createTemporaryIdentifier(
+          key,
+          occupiedIdentifiers
+        );
+        temporaryIdentifiers.set(key, temporary);
+        this.updateEntityIdentifier(
+          database,
+          assignment.table,
+          assignment.id,
+          circuitListId,
+          assignment.expected,
+          temporary
+        );
+      }
+    }
+
+    const occupiedPrefixes = new Set(
+      database
+        .select({ prefix: circuitSections.prefix })
+        .from(circuitSections)
+        .where(eq(circuitSections.circuitListId, circuitListId))
+        .all()
+        .map(({ prefix }) => prefix)
+    );
+    const temporaryPrefixes = new Map<string, string>();
+    for (const group of groups) {
+      const temporaryPrefix = createTemporaryValue(
+        `__tmp_group_prefix_${group.groupId}`,
+        occupiedPrefixes
+      );
+      temporaryPrefixes.set(group.groupId, temporaryPrefix);
+      const updated = database
+        .update(circuitSections)
+        .set({ groupNumber: null, prefix: temporaryPrefix })
+        .where(
+          and(
+            eq(circuitSections.id, group.groupId),
+            eq(circuitSections.circuitListId, circuitListId),
+            eq(circuitSections.groupNumber, group.expectedGroupNumber),
+            eq(circuitSections.prefix, group.expectedPrefix)
+          )
+        )
+        .run();
+      if (updated.changes !== 1) {
+        throw new Error("Circuit group changed during renumbering.");
+      }
+    }
+
+    for (const group of groups) {
+      const updated = database
+        .update(circuitSections)
+        .set({
+          groupNumber: group.targetGroupNumber,
+          prefix: group.targetPrefix,
+        })
+        .where(
+          and(
+            eq(circuitSections.id, group.groupId),
+            eq(circuitSections.circuitListId, circuitListId),
+            eq(circuitSections.prefix, temporaryPrefixes.get(group.groupId)!)
+          )
+        )
+        .run();
+      if (updated.changes !== 1) {
+        throw new Error("Circuit group changed during final renumbering.");
+      }
+    }
+
+    for (const group of groups) {
+      for (const assignment of group.circuits) {
+        this.updateEntityIdentifier(
+          database,
+          "circuit",
+          assignment.circuitId,
+          circuitListId,
+          temporaryIdentifiers.get(`circuit:${assignment.circuitId}`)!,
+          assignment.targetEquipmentIdentifier
+        );
+      }
+      for (const assignment of group.components) {
+        this.updateEntityIdentifier(
+          database,
+          "component",
+          assignment.componentId,
+          circuitListId,
+          temporaryIdentifiers.get(`component:${assignment.componentId}`)!,
+          assignment.targetEquipmentIdentifier
+        );
+      }
+    }
+    return inverse;
+  }
+
+  private assertCurrentState(
+    database: AppDatabase,
+    projectId: string,
+    circuitListId: string,
+    groups: CircuitGroupRenumberPlan["groups"]
+  ) {
+    const list = database
+      .select({ projectId: circuitLists.projectId })
+      .from(circuitLists)
+      .where(eq(circuitLists.id, circuitListId))
+      .get();
+    if (!list || list.projectId !== projectId) {
+      throw new Error("Circuit-group list does not belong to project.");
+    }
+    const selectedIds = new Set(groups.map((group) => group.groupId));
+    const allGroups = database
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.circuitListId, circuitListId))
+      .all();
+    for (const group of groups) {
+      const current = allGroups.find((entry) => entry.id === group.groupId);
+      if (
+        !current ||
+        current.category !== group.category ||
+        current.groupNumber !== group.expectedGroupNumber ||
+        current.prefix !== group.expectedPrefix
+      ) {
+        throw new Error("Circuit group changed before renumbering.");
+      }
+      const currentCircuits = database
+        .select({
+          id: circuits.id,
+          equipmentIdentifier: circuits.equipmentIdentifier,
+        })
+        .from(circuits)
+        .where(eq(circuits.sectionId, group.groupId))
+        .all();
+      const currentComponents = database
+        .select({
+          id: distributionBoardComponents.id,
+          equipmentIdentifier:
+            distributionBoardComponents.equipmentIdentifier,
+        })
+        .from(distributionBoardComponents)
+        .where(eq(distributionBoardComponents.sectionId, group.groupId))
+        .all();
+      if (
+        !matchesAssignments(currentCircuits, group.circuits, "circuitId") ||
+        !matchesAssignments(
+          currentComponents,
+          group.components,
+          "componentId"
+        )
+      ) {
+        throw new Error(
+          "Circuit-group renumber must include every unchanged child."
+        );
+      }
+    }
+    for (const group of groups) {
+      if (
+        allGroups.some(
+          (entry) =>
+            !selectedIds.has(entry.id) &&
+            entry.category === group.category &&
+            entry.groupNumber === group.targetGroupNumber
+        )
+      ) {
+        throw new Error(
+          "Target group number belongs to an unchanged group."
+        );
+      }
+    }
+  }
+
+  private updateEntityIdentifier(
+    database: AppDatabase,
+    table: "circuit" | "component",
+    id: string,
+    circuitListId: string,
+    expected: string,
+    target: string
+  ) {
+    const schema =
+      table === "circuit" ? circuits : distributionBoardComponents;
+    const updated = database
+      .update(schema)
+      .set({ equipmentIdentifier: target })
+      .where(
+        and(
+          eq(schema.id, id),
+          eq(schema.circuitListId, circuitListId),
+          eq(schema.equipmentIdentifier, expected)
+        )
+      )
+      .run();
+    if (updated.changes !== 1) {
+      throw new Error(
+        "Circuit-group child changed during renumbering."
+      );
+    }
+  }
+}
+
+function matchesAssignments<
+  TAssignment extends {
+    expectedEquipmentIdentifier: string;
+  },
+>(
+  current: Array<{ id: string; equipmentIdentifier: string }>,
+  assignments: TAssignment[],
+  idField: keyof TAssignment
+) {
+  if (current.length !== assignments.length) {
+    return false;
+  }
+  const currentById = new Map(current.map((entry) => [entry.id, entry]));
+  return assignments.every((assignment) => {
+    const id = assignment[idField];
+    return (
+      typeof id === "string" &&
+      currentById.get(id)?.equipmentIdentifier ===
+        assignment.expectedEquipmentIdentifier
+    );
+  });
+}
+
+function invertPlan(
+  groups: CircuitGroupRenumberPlan["groups"]
+): CircuitGroupRenumberPlan {
+  return {
+    groups: groups.map((group) => ({
+      ...group,
+      expectedGroupNumber: group.targetGroupNumber,
+      targetGroupNumber: group.expectedGroupNumber,
+      expectedPrefix: group.targetPrefix,
+      targetPrefix: group.expectedPrefix,
+      circuits: group.circuits.map((circuit) => ({
+        ...circuit,
+        expectedEquipmentIdentifier:
+          circuit.targetEquipmentIdentifier,
+        targetEquipmentIdentifier:
+          circuit.expectedEquipmentIdentifier,
+      })),
+      components: group.components.map((component) => ({
+        ...component,
+        expectedEquipmentIdentifier:
+          component.targetEquipmentIdentifier,
+        targetEquipmentIdentifier:
+          component.expectedEquipmentIdentifier,
+      })),
+    })),
+  };
+}
+
+function createTemporaryIdentifier(
+  key: string,
+  occupied: Set<string>
+) {
+  return createTemporaryValue(
+    `__tmp_group_renumber_${key.replace(":", "_")}`,
+    occupied,
+    normalizeIdentifier
+  );
+}
+
+function createTemporaryValue(
+  base: string,
+  occupied: Set<string>,
+  normalize: (value: string) => string = (value) => value
+) {
+  let candidate = base;
+  while (occupied.has(normalize(candidate))) {
+    candidate += "_";
+  }
+  occupied.add(normalize(candidate));
+  return candidate;
+}
+
+function normalizeIdentifier(value: string) {
+  return value.trim().toLocaleLowerCase();
+}

src/domain/models/circuit-group-renumber-project-command.model.ts

@@ -0,0 +1,183 @@
+import {
+  circuitGroupCategories,
+  type CircuitGroupCategory,
+} from "../../shared/constants/circuit-group.js";
+import {
+  formatCircuitGroupPrefix,
+  parseGroupedEquipmentIdentifier,
+} from "../services/circuit-group-numbering.js";
+import type { CircuitGroupRenumberPlan } from "../services/circuit-group-renumbering.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const circuitGroupRenumberCommandType =
+  "circuit-group.renumber" as const;
+export const circuitGroupRenumberCommandSchemaVersion = 1 as const;
+
+export interface CircuitGroupRenumberCommandPayload
+  extends CircuitGroupRenumberPlan {
+  circuitListId: string;
+}
+
+export interface CircuitGroupRenumberProjectCommand
+  extends SerializedProjectCommand<CircuitGroupRenumberCommandPayload> {
+  schemaVersion: typeof circuitGroupRenumberCommandSchemaVersion;
+  type: typeof circuitGroupRenumberCommandType;
+}
+
+export function createCircuitGroupRenumberProjectCommand(
+  circuitListId: string,
+  plan: CircuitGroupRenumberPlan
+): CircuitGroupRenumberProjectCommand {
+  const command: CircuitGroupRenumberProjectCommand = {
+    schemaVersion: circuitGroupRenumberCommandSchemaVersion,
+    type: circuitGroupRenumberCommandType,
+    payload: { circuitListId, groups: plan.groups },
+  };
+  assertCircuitGroupRenumberProjectCommand(command);
+  return command;
+}
+
+export function assertCircuitGroupRenumberProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupRenumberProjectCommand {
+  if (
+    command.schemaVersion !== circuitGroupRenumberCommandSchemaVersion ||
+    command.type !== circuitGroupRenumberCommandType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 2 ||
+    typeof command.payload.circuitListId !== "string" ||
+    !command.payload.circuitListId.trim() ||
+    !Array.isArray(command.payload.groups) ||
+    command.payload.groups.length === 0
+  ) {
+    throw new Error("Unsupported circuit-group renumber command.");
+  }
+  const groupIds = new Set<string>();
+  const entityIds = new Set<string>();
+  const targetGroupKeys = new Set<string>();
+  const targetIdentifiers = new Set<string>();
+  let hasChange = false;
+  for (const group of command.payload.groups) {
+    if (
+      !isPlainObject(group) ||
+      Object.keys(group).length !== 8 ||
+      typeof group.groupId !== "string" ||
+      !group.groupId.trim() ||
+      groupIds.has(group.groupId) ||
+      !circuitGroupCategories.includes(
+        group.category as CircuitGroupCategory
+      ) ||
+      !positiveInteger(group.expectedGroupNumber) ||
+      !positiveInteger(group.targetGroupNumber) ||
+      group.expectedPrefix !==
+        formatCircuitGroupPrefix(
+          group.category as CircuitGroupCategory,
+          group.expectedGroupNumber as number
+        ) ||
+      group.targetPrefix !==
+        formatCircuitGroupPrefix(
+          group.category as CircuitGroupCategory,
+          group.targetGroupNumber as number
+        ) ||
+      !Array.isArray(group.circuits) ||
+      !Array.isArray(group.components)
+    ) {
+      throw new Error("Circuit-group renumber assignment is invalid.");
+    }
+    const targetGroupKey = `${group.category}:${group.targetGroupNumber}`;
+    if (targetGroupKeys.has(targetGroupKey)) {
+      throw new Error(
+        "Circuit-group renumber contains duplicate target group numbers."
+      );
+    }
+    hasChange ||= group.expectedGroupNumber !== group.targetGroupNumber;
+    groupIds.add(group.groupId);
+    targetGroupKeys.add(targetGroupKey);
+    for (const circuit of group.circuits) {
+      assertEntityAssignment(
+        circuit,
+        "circuitId",
+        "circuit",
+        group.category as CircuitGroupCategory,
+        group.expectedGroupNumber as number,
+        group.targetGroupNumber as number,
+        entityIds,
+        targetIdentifiers
+      );
+    }
+    for (const component of group.components) {
+      assertEntityAssignment(
+        component,
+        "componentId",
+        "component",
+        group.category as CircuitGroupCategory,
+        group.expectedGroupNumber as number,
+        group.targetGroupNumber as number,
+        entityIds,
+        targetIdentifiers
+      );
+    }
+  }
+  if (!hasChange) {
+    throw new Error(
+      "Circuit-group renumber must change at least one group number."
+    );
+  }
+}
+
+function assertEntityAssignment(
+  value: unknown,
+  idField: "circuitId" | "componentId",
+  kind: "circuit" | "component",
+  category: CircuitGroupCategory,
+  expectedGroupNumber: number,
+  targetGroupNumber: number,
+  entityIds: Set<string>,
+  targetIdentifiers: Set<string>
+) {
+  if (
+    !isPlainObject(value) ||
+    Object.keys(value).length !== 3 ||
+    typeof value[idField] !== "string" ||
+    !(value[idField] as string).trim() ||
+    typeof value.expectedEquipmentIdentifier !== "string" ||
+    typeof value.targetEquipmentIdentifier !== "string" ||
+    entityIds.has(value[idField] as string) ||
+    targetIdentifiers.has(value.targetEquipmentIdentifier)
+  ) {
+    throw new Error(`Circuit-group renumber ${kind} assignment is invalid.`);
+  }
+  const expected = parseGroupedEquipmentIdentifier(
+    value.expectedEquipmentIdentifier
+  );
+  const target = parseGroupedEquipmentIdentifier(
+    value.targetEquipmentIdentifier
+  );
+  if (
+    !expected ||
+    !target ||
+    expected.kind !== target.kind ||
+    expected.category !== category ||
+    target.category !== category ||
+    expected.groupNumber !== expectedGroupNumber ||
+    target.groupNumber !== targetGroupNumber ||
+    (kind === "circuit" &&
+      (expected.kind !== "circuit" ||
+        expected.circuitNumber !== target.circuitNumber)) ||
+    (kind === "component" && expected.kind === "circuit")
+  ) {
+    throw new Error(
+      `Circuit-group renumber ${kind} identifiers are incompatible.`
+    );
+  }
+  entityIds.add(value[idField] as string);
+  targetIdentifiers.add(value.targetEquipmentIdentifier);
+}
+
+function positiveInteger(value: unknown): value is number {
+  return Number.isInteger(value) && (value as number) > 0;
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

src/domain/ports/circuit-group-renumber-project-command.store.ts

@@ -0,0 +1,22 @@
+import type { CircuitGroupRenumberProjectCommand } from "../models/circuit-group-renumber-project-command.model.js";
+import type {
+  AppendedProjectRevision,
+  ProjectRevisionSource,
+} from "./project-revision.store.js";
+
+export interface ExecuteCircuitGroupRenumberCommandInput {
+  projectId: string;
+  expectedRevision: number;
+  source: ProjectRevisionSource;
+  description?: string;
+  actorId?: string;
+  historyTargetChangeSetId?: string;
+  command: CircuitGroupRenumberProjectCommand;
+}
+
+export interface CircuitGroupRenumberProjectCommandStore {
+  execute(input: ExecuteCircuitGroupRenumberCommandInput): {
+    revision: AppendedProjectRevision;
+    inverse: CircuitGroupRenumberProjectCommand;
+  };
+}

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

@@ -99,6 +99,7 @@ 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 { CircuitGroupStructureProjectCommandStore } from "../ports/circuit-group-structure-project-command.store.js";
+import type { CircuitGroupRenumberProjectCommandStore } from "../ports/circuit-group-renumber-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 {
@@ -121,6 +122,10 @@ import {
   circuitGroupReorderCommandType,
   circuitGroupUpdateCommandType,
 } from "../models/circuit-group-structure-project-command.model.js";
+import {
+  assertCircuitGroupRenumberProjectCommand,
+  circuitGroupRenumberCommandType,
+} from "../models/circuit-group-renumber-project-command.model.js";
 import type { ProjectLocationStructureProjectCommandStore } from "../ports/project-location-structure-project-command.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";
@@ -157,6 +162,7 @@ export class ProjectCommandService implements ProjectCommandExecutor {
     private readonly projectStateRestoreStore: ProjectStateRestoreCommandStore,
     private readonly distributionBoardComponentStructureStore: DistributionBoardComponentStructureProjectCommandStore,
     private readonly circuitGroupStructureStore: CircuitGroupStructureProjectCommandStore,
+    private readonly circuitGroupRenumberStore: CircuitGroupRenumberProjectCommandStore,
     private readonly historyStore: ProjectHistoryStore
   ) {}
 
@@ -373,6 +379,13 @@ export class ProjectCommandService implements ProjectCommandExecutor {
           command: input.command,
         }).revision;
       }
+      case circuitGroupRenumberCommandType: {
+        assertCircuitGroupRenumberProjectCommand(input.command);
+        return this.circuitGroupRenumberStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
       case projectFloorInsertCommandType: {
         assertProjectFloorInsertProjectCommand(input.command);
         return this.projectLocationStructureStore.execute({

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

@@ -40,6 +40,7 @@ const commandTypeLabels: Record<string, string> = {
   "circuit-group.delete": "Stromkreisgruppe entfernt",
   "circuit-group.update": "Stromkreisgruppe bearbeitet",
   "circuit-group.reorder": "Stromkreisgruppen sortiert",
+  "circuit-group.renumber": "Stromkreisgruppen neu nummeriert",
   "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 { CircuitGroupStructureProjectCommandRepository } from "../../db/repositories/circuit-group-structure-project-command.repository.js";
+import { CircuitGroupRenumberProjectCommandRepository } from "../../db/repositories/circuit-group-renumber-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";
@@ -29,6 +30,8 @@ export const circuitStructureProjectCommandStore =
   new CircuitStructureProjectCommandRepository(db);
 export const circuitGroupStructureProjectCommandStore =
   new CircuitGroupStructureProjectCommandRepository(db);
+export const circuitGroupRenumberProjectCommandStore =
+  new CircuitGroupRenumberProjectCommandRepository(db);
 export const distributionBoardStructureProjectCommandStore =
   new DistributionBoardStructureProjectCommandRepository(db);
 export const distributionBoardComponentStructureProjectCommandStore =
@@ -67,5 +70,6 @@ export const projectCommandService = new ProjectCommandService(
   projectStateRestoreCommandStore,
   distributionBoardComponentStructureProjectCommandStore,
   circuitGroupStructureProjectCommandStore,
+  circuitGroupRenumberProjectCommandStore,
   projectHistoryStore
 );

tests/circuit-group-numbering.test.ts

@@ -10,6 +10,7 @@ import {
 } from "../src/domain/services/circuit-group-numbering.js";
 import "./circuit-group-structure-project-command.repository.test.js";
 import { createCircuitGroupRenumberPlan } from "../src/domain/services/circuit-group-renumbering.js";
+import "./circuit-group-renumber-project-command.repository.test.js";
 
 describe("circuit group numbering", () => {
   it("formats the agreed identifiers including the leading hyphen", () => {

tests/circuit-group-renumber-project-command.repository.test.ts

@@ -0,0 +1,311 @@
+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 { CircuitGroupRenumberProjectCommandRepository } from "../src/db/repositories/circuit-group-renumber-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 { circuits } from "../src/db/schema/circuits.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 { createCircuitGroupRenumberProjectCommand } from "../src/domain/models/circuit-group-renumber-project-command.model.js";
+import { createCircuitGroupRenumberPlan } from "../src/domain/services/circuit-group-renumbering.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" })
+    .run();
+  new DistributionBoardFixtureRepository(
+    context.db
+  ).createWithCircuitListAndDefaultSections("project-1", "UV-01");
+  const list = context.db.select().from(circuitLists).get()!;
+  const first = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.category, "lighting"))
+    .get()!;
+  context.db
+    .insert(circuitSections)
+    .values({
+      id: "lighting-2",
+      circuitListId: list.id,
+      key: "lighting_2",
+      displayName: "Beleuchtung 2",
+      prefix: "-1F2.",
+      sortOrder: 40,
+      category: "lighting",
+      groupNumber: 2,
+    })
+    .run();
+  context.db
+    .insert(circuits)
+    .values([
+      {
+        id: "circuit-lighting-1",
+        circuitListId: list.id,
+        sectionId: first.id,
+        equipmentIdentifier: "-1F1.7",
+        displayName: "Licht 1",
+        sortOrder: 10,
+      },
+      {
+        id: "circuit-lighting-2",
+        circuitListId: list.id,
+        sectionId: "lighting-2",
+        equipmentIdentifier: "-1F2.4",
+        displayName: "Licht 2",
+        sortOrder: 10,
+      },
+    ])
+    .run();
+  context.db
+    .insert(distributionBoardComponents)
+    .values([
+      {
+        id: "lighting-1-fuse",
+        circuitListId: list.id,
+        sectionId: first.id,
+        equipmentIdentifier: "-1F1.0",
+        name: "Vorsicherung",
+        role: "group_upstream_protection",
+        placement: "group",
+        sortOrder: 10,
+      },
+      {
+        id: "lighting-1-rcd",
+        circuitListId: list.id,
+        sectionId: first.id,
+        equipmentIdentifier: "-1Q1.0",
+        name: "Gruppen-FI",
+        role: "group_residual_current_protection",
+        placement: "group",
+        sortOrder: 20,
+      },
+    ])
+    .run();
+  return context;
+}
+
+function createSwapCommand(context: DatabaseContext) {
+  const list = context.db.select().from(circuitLists).get()!;
+  const groups = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.category, "lighting"))
+    .all()
+    .sort((left, right) => left.groupNumber! - right.groupNumber!)
+    .map((group) => ({
+      id: group.id,
+      category: group.category!,
+      groupNumber: group.groupNumber!,
+      prefix: group.prefix,
+      circuits: context.db
+        .select({
+          id: circuits.id,
+          equipmentIdentifier: circuits.equipmentIdentifier,
+        })
+        .from(circuits)
+        .where(eq(circuits.sectionId, group.id))
+        .all(),
+      components: context.db
+        .select({
+          id: distributionBoardComponents.id,
+          role: distributionBoardComponents.role,
+          equipmentIdentifier:
+            distributionBoardComponents.equipmentIdentifier,
+        })
+        .from(distributionBoardComponents)
+        .where(eq(distributionBoardComponents.sectionId, group.id))
+        .all()
+        .map((component) => ({
+          ...component,
+          role: component.role as
+            | "group_upstream_protection"
+            | "group_residual_current_protection",
+        })),
+    }));
+  return createCircuitGroupRenumberProjectCommand(
+    list.id,
+    createCircuitGroupRenumberPlan(groups, [
+      { groupId: groups[0].id, targetGroupNumber: 2 },
+      { groupId: groups[1].id, targetGroupNumber: 1 },
+    ])
+  );
+}
+
+describe("circuit-group renumber project command", () => {
+  it("swaps group numbers and every derived BMK through undo and redo", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createSwapCommand(context);
+      const repository =
+        new CircuitGroupRenumberProjectCommandRepository(context.db);
+      const executed = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, command.payload.groups[0].groupId))
+          .get()?.groupNumber,
+        2
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-lighting-1"))
+          .get()?.equipmentIdentifier,
+        "-1F2.7"
+      );
+      assert.deepEqual(
+        context.db
+          .select({ value: distributionBoardComponents.equipmentIdentifier })
+          .from(distributionBoardComponents)
+          .where(
+            eq(
+              distributionBoardComponents.sectionId,
+              command.payload.groups[0].groupId
+            )
+          )
+          .all()
+          .map(({ value }) => value)
+          .sort(),
+        ["-1F2.0", "-1Q2.0"]
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: executed.inverse,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-lighting-1"))
+          .get()?.equipmentIdentifier,
+        "-1F1.7"
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "redo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "redo")?.changeSetId,
+        command,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-lighting-2"))
+          .get()?.equipmentIdentifier,
+        "-1F1.4"
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects incomplete child snapshots without partial changes", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createSwapCommand(context);
+      command.payload.groups[0].components.pop();
+      assert.throws(
+        () =>
+          new CircuitGroupRenumberProjectCommandRepository(
+            context.db
+          ).execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command,
+          }),
+        /include every unchanged child/
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-lighting-1"))
+          .get()?.equipmentIdentifier,
+        "-1F1.7"
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back every group and BMK when history persistence fails", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createSwapCommand(context);
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_group_renumber_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced group renumber history failure');
+        END;
+      `);
+      assert.throws(
+        () =>
+          new CircuitGroupRenumberProjectCommandRepository(
+            context.db
+          ).execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command,
+          }),
+        /forced group renumber history failure/
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-lighting-1"))
+          .get()?.equipmentIdentifier,
+        "-1F1.7"
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(distributionBoardComponents)
+          .where(eq(distributionBoardComponents.id, "lighting-1-rcd"))
+          .get()?.equipmentIdentifier,
+        "-1Q1.0"
+      );
+    } finally {
+      context.close();
+    }
+  });
+});

tests/project-command.service.test.ts

@@ -15,6 +15,7 @@ import { CircuitSectionReorderProjectCommandRepository } from "../src/db/reposit
 import { CircuitSectionRenumberProjectCommandRepository } from "../src/db/repositories/circuit-section-renumber-project-command.repository.js";
 import { CircuitStructureProjectCommandRepository } from "../src/db/repositories/circuit-structure-project-command.repository.js";
 import { CircuitGroupStructureProjectCommandRepository } from "../src/db/repositories/circuit-group-structure-project-command.repository.js";
+import { CircuitGroupRenumberProjectCommandRepository } from "../src/db/repositories/circuit-group-renumber-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";
@@ -53,6 +54,8 @@ import {
   createCircuitGroupReorderProjectCommand,
   createCircuitGroupUpdateProjectCommand,
 } from "../src/domain/models/circuit-group-structure-project-command.model.js";
+import { createCircuitGroupRenumberProjectCommand } from "../src/domain/models/circuit-group-renumber-project-command.model.js";
+import { createCircuitGroupRenumberPlan } from "../src/domain/services/circuit-group-renumbering.js";
 import {
   createDistributionBoardInsertProjectCommand,
   createDistributionBoardStructureSnapshot,
@@ -138,6 +141,7 @@ function createService(context: DatabaseContext) {
       context.db
     ),
     new CircuitGroupStructureProjectCommandRepository(context.db),
+    new CircuitGroupRenumberProjectCommandRepository(context.db),
     new ProjectHistoryRepository(context.db)
   );
 }
@@ -1296,6 +1300,76 @@ describe("project command service", () => {
     }
   });
 
+  it("dispatches explicit circuit-group renumbering", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const existing = context.db
+        .select()
+        .from(circuitSections)
+        .where(eq(circuitSections.category, "three_phase"))
+        .get()!;
+      const added = {
+        id: "group-three-phase-2",
+        circuitListId: existing.circuitListId,
+        key: "three_phase_2",
+        displayName: "3-phasig 2",
+        prefix: "-3F2.",
+        sortOrder: 40,
+        category: "three_phase" as const,
+        groupNumber: 2,
+      };
+      service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command: createCircuitGroupInsertProjectCommand(added),
+      });
+      const plan = createCircuitGroupRenumberPlan(
+        [
+          {
+            id: existing.id,
+            category: "three_phase",
+            groupNumber: 1,
+            prefix: "-3F1.",
+            circuits: [],
+            components: [],
+          },
+          {
+            id: added.id,
+            category: "three_phase",
+            groupNumber: 2,
+            prefix: "-3F2.",
+            circuits: [],
+            components: [],
+          },
+        ],
+        [
+          { groupId: existing.id, targetGroupNumber: 2 },
+          { groupId: added.id, targetGroupNumber: 1 },
+        ]
+      );
+      const result = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 1,
+        command: createCircuitGroupRenumberProjectCommand(
+          existing.circuitListId,
+          plan
+        ),
+      });
+      assert.equal(result.history.currentRevision, 2);
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, existing.id))
+          .get()?.prefix,
+        "-3F2."
+      );
+    } 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

@@ -15,6 +15,7 @@ import { CircuitSectionRenumberProjectCommandRepository } from "../src/db/reposi
 import { CircuitSectionReorderProjectCommandRepository } from "../src/db/repositories/circuit-section-reorder-project-command.repository.js";
 import { CircuitStructureProjectCommandRepository } from "../src/db/repositories/circuit-structure-project-command.repository.js";
 import { CircuitGroupStructureProjectCommandRepository } from "../src/db/repositories/circuit-group-structure-project-command.repository.js";
+import { CircuitGroupRenumberProjectCommandRepository } from "../src/db/repositories/circuit-group-renumber-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";
@@ -197,6 +198,7 @@ function createService(context: DatabaseContext) {
       context.db
     ),
     new CircuitGroupStructureProjectCommandRepository(context.db),
+    new CircuitGroupRenumberProjectCommandRepository(context.db),
     new ProjectHistoryRepository(context.db)
   );
 }

tests/project-version-history.test.ts

@@ -163,6 +163,12 @@ describe("project version history presentation", () => {
       ),
       "Stromkreisgruppen sortiert"
     );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(12, { commandType: "circuit-group.renumber" })
+      ),
+      "Stromkreisgruppen neu nummeriert"
+    );
     assert.equal(getProjectSnapshotKindLabel("named"), "Benannt");
     assert.equal(
       getProjectSnapshotKindLabel("automatic"),