WIP multiple sections

AGENTS.md

@@ -309,6 +309,33 @@ snapshots include the optional one-to-one protection-device state and reject
 stale data. Updates preserve id, ownership, role and placement. Fixed
 main-switch and surge-protection header roles are excluded from these general
 component commands.
+Empty circuit-group creation, display-name updates and deletion use
+`circuit-group.insert`, `circuit-group.update` and `circuit-group.delete`.
+Their snapshots keep category, positive group number and derived prefix
+consistent. General deletion rejects groups containing circuits or group
+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.
+Cross-group circuit moves use `circuit.move-group` and are limited to distinct
+groups of the same category. The stored target BMK is highest target suffix
+plus one at planning time and is never recalculated for Redo. Only circuit
+group, BMK and sort order change; device rows and circuit protection retain the
+stable circuit id.
+Confirmed populated-group deletion uses
+`circuit-group.delete-subtree`/`circuit-group.restore-subtree`. The exact
+snapshot contains the group, optional component protections, complete circuits,
+circuit protections and all device-row link/override metadata. Delete
+re-captures and compares the subtree before cascading; restore preserves every
+UUID in foreign-key-safe order.
+The circuit-tree read model exposes fixed `headerComponents`, group-owned
+`components`, `footerComponents`, optional group category/number and optional
+one-to-one protection DTOs for circuits and group components. These are
+additive to the retained flat circuit protection fields during the transition.
 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/circuit-list-editor-api.md

@@ -230,7 +230,11 @@ returns HTTP `409` with `PROJECT_HISTORY_OPERATION_UNAVAILABLE`.
 ### Tree Endpoint
 
 - `GET /projects/:projectId/circuit-lists/:circuitListId/tree`
-- Purpose: returns section/circuit/device-row tree with calculated row and circuit totals.
+- Purpose: returns fixed header components, grouped sections with optional
+  protection components, complete circuit/device-row blocks and auxiliary
+  footer components. Circuit and component protection devices use their
+  separate one-to-one DTOs. Calculated row, circuit, section and board totals
+  remain included.
 
 Response sketch:
 
@@ -238,16 +242,47 @@ Response sketch:
 {
   "circuitListId": "cl_1",
   "currentRevision": 12,
+  "headerComponents": [
+    {
+      "id": "cmp_main",
+      "equipmentIdentifier": "-Q0",
+      "name": "Hauptschalter",
+      "role": "main_switch",
+      "placement": "header"
+    }
+  ],
   "sections": [
     {
       "id": "sec_1",
       "key": "lighting",
-      "prefix": "-1F",
+      "prefix": "-1F1.",
+      "category": "lighting",
+      "groupNumber": 1,
+      "components": [
+        {
+          "id": "cmp_rcd",
+          "equipmentIdentifier": "-1Q1.0",
+          "name": "Gruppen-FI",
+          "role": "group_residual_current_protection",
+          "placement": "group",
+          "protectionDevice": {
+            "type": "FI",
+            "ratedCurrentA": 40,
+            "rcdType": "A",
+            "ratedResidualCurrentMa": 30
+          }
+        }
+      ],
       "circuits": [
         {
           "id": "cir_1",
-          "equipmentIdentifier": "-1F1",
+          "equipmentIdentifier": "-1F1.1",
           "circuitTotalPower": 4.2,
+          "protectionDevice": {
+            "type": "LS",
+            "ratedCurrentA": 10,
+            "tripCharacteristic": "B"
+          },
           "deviceRows": [
             {
               "id": "row_1",
@@ -258,6 +293,15 @@ Response sketch:
         }
       ]
     }
+  ],
+  "footerComponents": [
+    {
+      "id": "cmp_actor",
+      "equipmentIdentifier": "-K1",
+      "name": "KNX Schaltaktor",
+      "role": "auxiliary",
+      "placement": "footer"
+    }
   ]
 }
 ```

docs/current-architecture.md

@@ -298,6 +298,63 @@ veraltete Zustände werden innerhalb derselben Transaktion geprüft. Die festen
 Kopfkomponenten Hauptschalter und Überspannungsableiter sind von diesen
 allgemeinen Commands ausgeschlossen. API- und Editorintegration folgen in den
 nächsten Arbeitspaketen.
+Leere Stromkreisgruppen werden über `circuit-group.insert`,
+`circuit-group.update` und `circuit-group.delete` verwaltet. Ihr vollständiger
+Snapshot koppelt Kategorie, positive Gruppennummer und daraus abgeleiteten
+BMK-Präfix; allgemeine Updates ändern ausschließlich den Anzeigenamen.
+Löschen verlangt einen exakt unveränderten Zustand ohne Stromkreise und ohne
+Gruppenkomponenten. Das bestätigte Löschen befüllter Unterbäume bleibt ein
+eigener späterer Command.
+`circuit-group.reorder` sortiert Gruppen als vollständige Stromkreislisten-
+Zuordnung. Jede vorhandene Gruppe muss mit erwarteter und neuer Position
+enthalten sein. Der Command verändert ausschließlich `sortOrder`; Nummern,
+Präfixe und Stromkreis-BMKs bleiben stabil. Die gesamte Sortierung bildet eine
+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.
+`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.
+`src/domain/services/circuit-group-move-planning.ts` plant den Wechsel eines
+vollständigen Stromkreises zwischen zwei verschiedenen Gruppen derselben
+Kategorie. Die Ziel-BMK verwendet die höchste vorhandene Stromkreis-Endnummer
+der Zielgruppe plus eins; Lücken werden nicht gefüllt. Quell-/Zielgruppe,
+Quell-/Zielposition und beide BMKs werden festgeschrieben, damit eine spätere
+Wiederholung nichts neu berechnet.
+`circuit.move-group` führt den geplanten Wechsel als eine Projekt-Revision aus.
+Nur `sectionId`, `equipmentIdentifier` und `sortOrder` des Stromkreises ändern
+sich. Gerätezeilen und das getrennte 1:1-Schutzgerät bleiben über die stabile
+Stromkreis-UUID verbunden. Der inverse Wechsel speichert Quellgruppe, BMK und
+Position vollständig für dauerhaftes Undo/Redo.
+`CircuitGroupSubtreeSnapshot` ist der kanonische Vertrag für destruktive
+Gruppenoperationen. Er umfasst Gruppe, optionale Gruppenkomponenten samt
+1:1-Schutzdaten, vollständige Stromkreise samt 1:1-Schutzdaten und sämtliche
+Gerätezeilen einschließlich Link- und Override-Metadaten. Seine
+Warnzusammenfassung liefert Vorsicherung/FI sowie Stromkreis- und
+Gerätezeilenanzahl.
+`circuit-group.delete-subtree` nimmt den aktuellen Unterbaum unmittelbar vor
+dem Löschen erneut auf und verlangt exakte Übereinstimmung mit dem bestätigten
+Snapshot. `circuit-group.restore-subtree` schreibt ihn in FK-sicherer Reihenfolge
+mit denselben UUIDs zurück. Beide Richtungen laufen als vollständige inverse
+Projekt-Commands; späte Fehler hinterlassen weder Teillöschungen noch
+Teilwiederherstellungen.
+Der Circuit-Tree liefert zusätzlich `headerComponents`,
+gruppenbezogene `components` und `footerComponents`. Abschnitte enthalten
+optionale Gruppenkategorie und -nummer; Stromkreise und Gruppenkomponenten
+enthalten ihre optionale getrennte Schutzgerätekonfiguration. Die bisherigen
+flachen Stromkreis-Schutzfelder bleiben während der Übergangsphase additiv
+erhalten. Separate aktive Read-Repositories lesen Komponenten- und beide
+Schutzgerätetabellen; Schreibzugriffe bleiben ausschließlich in Commands.
+`src/frontend/utils/circuit-structure-projection.ts` projiziert diesen Tree
+rein und deterministisch in die drei Zonen Kopf, vollständige Gruppen und Fuß.
+Innerhalb einer Gruppe folgen auf die Überschrift optionale Schutzkomponenten,
+vollständige Stromkreisblöcke und der freie Einfügeplatz. Leere Gruppen bleiben
+sichtbar; Komponenten werden stabil nach `sortOrder` und ID sortiert.
 `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
@@ -369,8 +426,9 @@ Kopieren in ein Projekt erzeugt ein eigenständiges Projektgerät.
   stromkreislistenweite BMK-Eindeutigkeit über Stromkreise und
   Verteilerkomponenten. Snapshot- und Transfer-Integration verwenden
   Snapshot-Schema 7. Persistente Insert/Delete/Update-Commands für
-  veränderliche Verteilerkomponenten sind integriert; Gruppen- und UI-Schritte
-  folgen in abgegrenzten Arbeitspaketen.
+  veränderliche Verteilerkomponenten sowie CRUD-Commands für leere Gruppen
+  sowie vollständige Gruppensortierung sind integriert; befüllte Unterbäume
+  und UI folgen in abgegrenzten Arbeitspaketen.
 
 PostgreSQL ist bewusst nicht implementiert. Die Domainregeln und
 Transaktionsgrenzen sollen portabel bleiben; Schema und Betriebsmodell benötigen

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

@@ -23,8 +23,17 @@ requirements and intended sequencing, not proof of implementation.
 - [x] Phase C2a1: persistent insert/delete commands for mutable group
   protection and auxiliary components.
 - [x] Phase C2a2: component update and reorder commands.
-- [ ] Phase C2b: group CRUD and reorder commands.
-- [ ] Phase D: group numbering, moves and destructive operations.
+- [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.
+- [x] Phase D1b: persistent collision-safe group-renumber command.
+- [x] Phase D2a: deterministic same-category circuit-move plan.
+- [x] Phase D2b: persistent same-category circuit-move command.
+- [x] Phase D3a: complete validated group-subtree snapshot and warning summary.
+- [x] Phase D3b: persistent populated-group delete/restore command.
+- [x] Phase E1: tree read model for components, groups and protection devices.
+- [x] Phase E2a: pure header/group/footer structure projection.
+- [ ] Phase E2b: render the structure projection in the editor grid.
 - [ ] Phase E: editor projection and editing.
 - [ ] Phase F: documentation and full GUI verification.
 - [ ] Keep full electrical sizing and cable-dimensioning rules separate until

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

@@ -593,8 +593,7 @@ Acceptance:
 
 ### C. Persistent Commands and Board Defaults
 
-Status: In progress. New-board defaults C1 and component management C2a are
-complete. Group management C2b remains pending.
+Status: Complete.
 
 - extend `distribution-board.insert` with fixed components and three groups
 - implement component and group CRUD commands
@@ -635,6 +634,26 @@ Implemented in C2a2:
 - stale expected state and cross-entity BMK collisions are rejected; Undo/Redo
   restores the exact previous snapshot
 
+Implemented in C2b1:
+
+- `circuit-group.insert`, `circuit-group.update` and
+  `circuit-group.delete` persist complete group snapshots with stable UUIDs
+- category, group number and prefix are validated as one consistent identity;
+  general updates change only the display name
+- deletion requires an exact unchanged and empty group; populated destructive
+  deletion remains the separately confirmed Phase-D operation
+- project/list ownership, stale state, Undo/Redo and late rollback are covered
+  at the shared transaction boundary
+
+Implemented in C2b2:
+
+- `circuit-group.reorder` requires every group in the circuit list with its
+  exact expected and target `sortOrder`
+- sorting changes no group number, prefix or circuit equipment identifier
+- incomplete or stale assignments are rejected before history is recorded
+- the complete reorder is one project revision and one persistent Undo/Redo
+  step; late failures roll back every position
+
 Acceptance:
 
 - new boards contain the agreed fixed structure
@@ -643,11 +662,73 @@ Acceptance:
 
 ### D. Group Numbering and Circuit Moves
 
+Status: Complete.
+
 - implement nested identifier generation
 - support same-category cross-group circuit moves
 - implement explicit collision-safe group renumbering
 - implement confirmed populated-group deletion
 
+Implemented in D1a:
+
+- a pure renumber planner derives group prefixes, circuit BMKs and optional
+  upstream-protection/RCD BMKs from category and target group number
+- outgoing-circuit suffixes remain unchanged
+- number swaps are allowed only when every conflicting group participates
+- 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
+
+Implemented in D2a:
+
+- a pure planner permits moves only between distinct groups of the same
+  category
+- it validates the source BMK and stores source/target group and sort position
+- the target BMK uses the highest existing target-group circuit suffix plus one
+  and never fills gaps
+- the computed target BMK is part of the plan and is not recalculated for Redo
+
+Implemented in D2b:
+
+- `circuit.move-group` atomically changes only the circuit's group, BMK and
+  sort position
+- the circuit UUID remains stable, so its device rows and one-to-one protection
+  device remain connected without copying
+- execution revalidates project/list ownership, both group identities and the
+  complete expected circuit state
+- Undo/Redo uses the stored inverse move and late failures restore source
+  group, BMK and position
+
+Implemented in D3a:
+
+- one validated subtree snapshot combines the group, optional group components
+  and their protection devices, complete circuits and their protection devices,
+  and all circuit device rows
+- linked-project-device and override metadata remain part of every row snapshot
+- ownership and BMK uniqueness are checked across the complete subtree
+- the snapshot derives the confirmation summary for upstream protection, RCD,
+  circuit count and device-row count
+
+Implemented in D3b:
+
+- `circuit-group.delete-subtree` requires the exact previously confirmed
+  snapshot and re-captures the full current subtree before deletion
+- `circuit-group.restore-subtree` restores stable UUIDs in foreign-key-safe
+  order, including both protection layers and row link/override metadata
+- deletion and restoration are exact persistent inverses for Undo/Redo
+- stale confirmation state and late history failures leave no partial delete
+  or restore
+
 Acceptance:
 
 - target identifiers use highest suffix plus one
@@ -658,6 +739,9 @@ Acceptance:
 
 ### E. Editor Projection and Editing
 
+Status: In progress. The complete tree read model E1 and pure structural
+projection E2a are complete. Grid rendering and editing remain pending.
+
 - render fixed header components
 - render group components and circuit blocks
 - render sortable auxiliary footer components
@@ -665,6 +749,17 @@ Acceptance:
 - add type-dependent protection editing
 - keep spreadsheet selection, keyboard and drag behavior coherent
 
+Implemented in E1/E2a:
+
+- the tree response exposes fixed header, group and auxiliary footer
+  components plus both one-to-one protection layers
+- a pure projection produces the stable order header, complete groups and
+  footer without mixing zones
+- each group keeps its heading, optional protection components, complete
+  circuit blocks and free placeholder together
+- empty groups remain visible and circuit device rows remain owned by their
+  circuit block
+
 Acceptance:
 
 - the visible order is header, groups, footer

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

@@ -0,0 +1,104 @@
+import { and, eq } from "drizzle-orm";
+import {
+  assertCircuitGroupMoveProjectCommand,
+  createCircuitGroupMoveProjectCommand,
+  invertCircuitGroupMovePlan,
+} from "../../domain/models/circuit-group-move-project-command.model.js";
+import type {
+  CircuitGroupMoveProjectCommandStore,
+  ExecuteCircuitGroupMoveCommandInput,
+} from "../../domain/ports/circuit-group-move-project-command.store.js";
+import { parseGroupedEquipmentIdentifier } from "../../domain/services/circuit-group-numbering.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 { executeProjectCommandTransaction } from "./project-command-transaction.persistence.js";
+
+export class CircuitGroupMoveProjectCommandRepository
+  implements CircuitGroupMoveProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  execute(input: ExecuteCircuitGroupMoveCommandInput) {
+    assertCircuitGroupMoveProjectCommand(input.command);
+    return executeProjectCommandTransaction(
+      this.database,
+      input,
+      (tx) => this.applyCommand(tx, input)
+    );
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    input: ExecuteCircuitGroupMoveCommandInput
+  ) {
+    const plan = input.command.payload;
+    const list = database
+      .select({ projectId: circuitLists.projectId })
+      .from(circuitLists)
+      .where(eq(circuitLists.id, plan.circuitListId))
+      .get();
+    if (!list || list.projectId !== input.projectId) {
+      throw new Error("Circuit list does not belong to project.");
+    }
+    const source = database
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.id, plan.expectedSectionId))
+      .get();
+    const target = database
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.id, plan.targetSectionId))
+      .get();
+    const expectedBmk = parseGroupedEquipmentIdentifier(
+      plan.expectedEquipmentIdentifier
+    );
+    const targetBmk = parseGroupedEquipmentIdentifier(
+      plan.targetEquipmentIdentifier
+    );
+    if (
+      !source ||
+      !target ||
+      source.circuitListId !== plan.circuitListId ||
+      target.circuitListId !== plan.circuitListId ||
+      source.category === null ||
+      source.category !== target.category ||
+      source.category !== expectedBmk?.category ||
+      source.groupNumber !== expectedBmk.groupNumber ||
+      target.category !== targetBmk?.category ||
+      target.groupNumber !== targetBmk.groupNumber
+    ) {
+      throw new Error(
+        "Circuit move requires matching source and target groups."
+      );
+    }
+    const updated = database
+      .update(circuits)
+      .set({
+        sectionId: plan.targetSectionId,
+        equipmentIdentifier: plan.targetEquipmentIdentifier,
+        sortOrder: plan.targetSortOrder,
+      })
+      .where(
+        and(
+          eq(circuits.id, plan.circuitId),
+          eq(circuits.circuitListId, plan.circuitListId),
+          eq(circuits.sectionId, plan.expectedSectionId),
+          eq(
+            circuits.equipmentIdentifier,
+            plan.expectedEquipmentIdentifier
+          ),
+          eq(circuits.sortOrder, plan.expectedSortOrder)
+        )
+      )
+      .run();
+    if (updated.changes !== 1) {
+      throw new Error("Circuit changed before group move.");
+    }
+    return createCircuitGroupMoveProjectCommand(
+      invertCircuitGroupMovePlan(plan)
+    );
+  }
+}

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/db/repositories/circuit-group-structure-project-command.repository.ts

@@ -0,0 +1,261 @@
+import { and, eq } from "drizzle-orm";
+import {
+  assertCircuitGroupDeleteProjectCommand,
+  assertCircuitGroupInsertProjectCommand,
+  assertCircuitGroupReorderProjectCommand,
+  assertCircuitGroupUpdateProjectCommand,
+  circuitGroupDeleteCommandType,
+  circuitGroupInsertCommandType,
+  circuitGroupReorderCommandType,
+  circuitGroupUpdateCommandType,
+  createCircuitGroupDeleteProjectCommand,
+  createCircuitGroupInsertProjectCommand,
+  createCircuitGroupReorderProjectCommand,
+  createCircuitGroupUpdateProjectCommand,
+  type CircuitGroupReorderAssignment,
+  type CircuitGroupSnapshot,
+  type CircuitGroupStructureProjectCommand,
+} from "../../domain/models/circuit-group-structure-project-command.model.js";
+import type {
+  CircuitGroupStructureProjectCommandStore,
+  ExecuteCircuitGroupStructureCommandInput,
+} from "../../domain/ports/circuit-group-structure-project-command.store.js";
+import type { AppDatabase } from "../database-context.js";
+import { circuitLists } from "../schema/circuit-lists.js";
+import { circuitSections } from "../schema/circuit-sections.js";
+import { circuits } from "../schema/circuits.js";
+import { distributionBoardComponents } from "../schema/distribution-board-components.js";
+import { executeProjectCommandTransaction } from "./project-command-transaction.persistence.js";
+
+export class CircuitGroupStructureProjectCommandRepository
+  implements CircuitGroupStructureProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  execute(input: ExecuteCircuitGroupStructureCommandInput) {
+    return executeProjectCommandTransaction(
+      this.database,
+      input,
+      (tx) => this.applyCommand(tx, input.projectId, input.command)
+    );
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    projectId: string,
+    command: CircuitGroupStructureProjectCommand
+  ): CircuitGroupStructureProjectCommand {
+    if (command.type === circuitGroupInsertCommandType) {
+      assertCircuitGroupInsertProjectCommand(command);
+      this.insert(database, projectId, command.payload.snapshot);
+      return createCircuitGroupDeleteProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    if (command.type === circuitGroupDeleteCommandType) {
+      assertCircuitGroupDeleteProjectCommand(command);
+      this.delete(database, projectId, command.payload.snapshot);
+      return createCircuitGroupInsertProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    if (command.type === circuitGroupUpdateCommandType) {
+      assertCircuitGroupUpdateProjectCommand(command);
+      this.update(
+        database,
+        projectId,
+        command.payload.expected,
+        command.payload.target
+      );
+      return createCircuitGroupUpdateProjectCommand(
+        command.payload.target,
+        command.payload.expected
+      );
+    }
+    if (command.type === circuitGroupReorderCommandType) {
+      assertCircuitGroupReorderProjectCommand(command);
+      const inverseAssignments = this.reorder(
+        database,
+        projectId,
+        command.payload.circuitListId,
+        command.payload.assignments
+      );
+      return createCircuitGroupReorderProjectCommand(
+        command.payload.circuitListId,
+        inverseAssignments
+      );
+    }
+    throw new Error("Unsupported circuit-group structure command.");
+  }
+
+  private insert(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: CircuitGroupSnapshot
+  ) {
+    this.assertListOwnership(database, projectId, snapshot.circuitListId);
+    const existing = database
+      .select({ id: circuitSections.id })
+      .from(circuitSections)
+      .where(eq(circuitSections.id, snapshot.id))
+      .get();
+    if (existing) {
+      throw new Error("Circuit-group id already exists.");
+    }
+    database.insert(circuitSections).values(snapshot).run();
+  }
+
+  private delete(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: CircuitGroupSnapshot
+  ) {
+    this.assertListOwnership(database, projectId, snapshot.circuitListId);
+    const current = this.getCurrent(database, snapshot.id);
+    if (!current || !sameRecord(snapshot, current)) {
+      throw new Error("Circuit group changed before deletion.");
+    }
+    const circuit = database
+      .select({ id: circuits.id })
+      .from(circuits)
+      .where(eq(circuits.sectionId, snapshot.id))
+      .get();
+    const component = database
+      .select({ id: distributionBoardComponents.id })
+      .from(distributionBoardComponents)
+      .where(eq(distributionBoardComponents.sectionId, snapshot.id))
+      .get();
+    if (circuit || component) {
+      throw new Error(
+        "Only empty circuit groups can be deleted by this command."
+      );
+    }
+    const deleted = database
+      .delete(circuitSections)
+      .where(
+        and(
+          eq(circuitSections.id, snapshot.id),
+          eq(circuitSections.circuitListId, snapshot.circuitListId)
+        )
+      )
+      .run();
+    if (deleted.changes !== 1) {
+      throw new Error("Circuit group could not be deleted.");
+    }
+  }
+
+  private update(
+    database: AppDatabase,
+    projectId: string,
+    expected: CircuitGroupSnapshot,
+    target: CircuitGroupSnapshot
+  ) {
+    this.assertListOwnership(database, projectId, expected.circuitListId);
+    const current = this.getCurrent(database, expected.id);
+    if (!current || !sameRecord(expected, current)) {
+      throw new Error("Circuit group changed before update.");
+    }
+    const updated = database
+      .update(circuitSections)
+      .set({ displayName: target.displayName })
+      .where(
+        and(
+          eq(circuitSections.id, expected.id),
+          eq(circuitSections.circuitListId, expected.circuitListId)
+        )
+      )
+      .run();
+    if (updated.changes !== 1) {
+      throw new Error("Circuit group could not be updated.");
+    }
+  }
+
+  private assertListOwnership(
+    database: AppDatabase,
+    projectId: string,
+    circuitListId: string
+  ) {
+    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 does not belong to project.");
+    }
+  }
+
+  private reorder(
+    database: AppDatabase,
+    projectId: string,
+    circuitListId: string,
+    assignments: CircuitGroupReorderAssignment[]
+  ) {
+    this.assertListOwnership(database, projectId, circuitListId);
+    const persisted = database
+      .select({
+        id: circuitSections.id,
+        sortOrder: circuitSections.sortOrder,
+      })
+      .from(circuitSections)
+      .where(eq(circuitSections.circuitListId, circuitListId))
+      .all();
+    const persistedById = new Map(
+      persisted.map((group) => [group.id, group])
+    );
+    if (
+      persisted.length !== assignments.length ||
+      assignments.some((assignment) => {
+        const group = persistedById.get(assignment.groupId);
+        return !group || group.sortOrder !== assignment.expectedSortOrder;
+      })
+    ) {
+      throw new Error(
+        "Circuit-group reorder must include every unchanged group in the list."
+      );
+    }
+    for (const assignment of assignments) {
+      if (assignment.expectedSortOrder === assignment.targetSortOrder) {
+        continue;
+      }
+      const updated = database
+        .update(circuitSections)
+        .set({ sortOrder: assignment.targetSortOrder })
+        .where(
+          and(
+            eq(circuitSections.id, assignment.groupId),
+            eq(circuitSections.circuitListId, circuitListId),
+            eq(circuitSections.sortOrder, assignment.expectedSortOrder)
+          )
+        )
+        .run();
+      if (updated.changes !== 1) {
+        throw new Error("Circuit group changed during reorder.");
+      }
+    }
+    return assignments.map((assignment) => ({
+      groupId: assignment.groupId,
+      expectedSortOrder: assignment.targetSortOrder,
+      targetSortOrder: assignment.expectedSortOrder,
+    }));
+  }
+
+  private getCurrent(database: AppDatabase, id: string) {
+    return database
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.id, id))
+      .get();
+  }
+}
+
+function sameRecord(expected: object, actual: object) {
+  const expectedEntries = Object.entries(expected);
+  const actualRecord = actual as Record<string, unknown>;
+  return (
+    expectedEntries.length === Object.keys(actual).length &&
+    expectedEntries.every(
+      ([key, value]) => actualRecord[key] === value
+    )
+  );
+}

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

@@ -0,0 +1,257 @@
+import { asc, eq } from "drizzle-orm";
+import {
+  circuitGroupDeleteSubtreeCommandType,
+  circuitGroupRestoreSubtreeCommandType,
+  assertCircuitGroupDeleteSubtreeProjectCommand,
+  assertCircuitGroupRestoreSubtreeProjectCommand,
+  createCircuitGroupDeleteSubtreeProjectCommand,
+  createCircuitGroupRestoreSubtreeProjectCommand,
+  type CircuitGroupSubtreeProjectCommand,
+} from "../../domain/models/circuit-group-subtree-project-command.model.js";
+import type {
+  CircuitGroupSubtreeSnapshot,
+  CircuitProtectionDeviceSnapshot,
+} from "../../domain/models/circuit-group-subtree-snapshot.model.js";
+import type {
+  CircuitGroupSubtreeProjectCommandStore,
+  ExecuteCircuitGroupSubtreeCommandInput,
+} from "../../domain/ports/circuit-group-subtree-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 { circuitProtectionDevices } from "../schema/circuit-protection-devices.js";
+import { circuitSections } from "../schema/circuit-sections.js";
+import { circuits } from "../schema/circuits.js";
+import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
+import { distributionBoardComponents } from "../schema/distribution-board-components.js";
+import { executeProjectCommandTransaction } from "./project-command-transaction.persistence.js";
+
+export class CircuitGroupSubtreeProjectCommandRepository
+  implements CircuitGroupSubtreeProjectCommandStore
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  capture(projectId: string, groupId: string) {
+    return this.captureFrom(this.database, projectId, groupId);
+  }
+
+  execute(input: ExecuteCircuitGroupSubtreeCommandInput) {
+    if (input.command.type === circuitGroupDeleteSubtreeCommandType) {
+      assertCircuitGroupDeleteSubtreeProjectCommand(input.command);
+    } else {
+      assertCircuitGroupRestoreSubtreeProjectCommand(input.command);
+    }
+    return executeProjectCommandTransaction(
+      this.database,
+      input,
+      (tx) => this.applyCommand(tx, input.projectId, input.command)
+    );
+  }
+
+  private applyCommand(
+    database: AppDatabase,
+    projectId: string,
+    command: CircuitGroupSubtreeProjectCommand
+  ) {
+    if (command.type === circuitGroupDeleteSubtreeCommandType) {
+      const current = this.captureFrom(
+        database,
+        projectId,
+        command.payload.snapshot.group.id
+      );
+      if (!sameSnapshot(current, command.payload.snapshot)) {
+        throw new Error(
+          "Circuit-group subtree changed before deletion."
+        );
+      }
+      const deleted = database
+        .delete(circuitSections)
+        .where(eq(circuitSections.id, current.group.id))
+        .run();
+      if (deleted.changes !== 1) {
+        throw new Error("Circuit-group subtree could not be deleted.");
+      }
+      return createCircuitGroupRestoreSubtreeProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    if (command.type === circuitGroupRestoreSubtreeCommandType) {
+      this.restore(database, projectId, command.payload.snapshot);
+      return createCircuitGroupDeleteSubtreeProjectCommand(
+        command.payload.snapshot
+      );
+    }
+    throw new Error("Unsupported circuit-group subtree command.");
+  }
+
+  private captureFrom(
+    database: AppDatabase,
+    projectId: string,
+    groupId: string
+  ): CircuitGroupSubtreeSnapshot {
+    const group = database
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.id, groupId))
+      .get();
+    if (!group || group.category === null || group.groupNumber === null) {
+      throw new Error("Circuit group not found.");
+    }
+    this.assertListOwnership(database, projectId, group.circuitListId);
+    const components = database
+      .select()
+      .from(distributionBoardComponents)
+      .where(eq(distributionBoardComponents.sectionId, group.id))
+      .orderBy(
+        asc(distributionBoardComponents.sortOrder),
+        asc(distributionBoardComponents.id)
+      )
+      .all()
+      .map((component) => ({
+        component: {
+          ...component,
+          role: component.role as
+            | "group_upstream_protection"
+            | "group_residual_current_protection",
+        },
+        protectionDevice:
+          database
+            .select()
+            .from(distributionBoardComponentProtectionDevices)
+            .where(
+              eq(
+                distributionBoardComponentProtectionDevices.componentId,
+                component.id
+              )
+            )
+            .get() ?? null,
+      }));
+    const circuitSnapshots = database
+      .select()
+      .from(circuits)
+      .where(eq(circuits.sectionId, group.id))
+      .orderBy(asc(circuits.sortOrder), asc(circuits.id))
+      .all()
+      .map((circuit) => {
+        const { isReserve, ...values } = circuit;
+        return {
+          circuit: {
+            ...values,
+            isReserve: Boolean(isReserve),
+            deviceRows: database
+              .select()
+              .from(circuitDeviceRows)
+              .where(eq(circuitDeviceRows.circuitId, circuit.id))
+              .orderBy(
+                asc(circuitDeviceRows.sortOrder),
+                asc(circuitDeviceRows.id)
+              )
+              .all(),
+          },
+          protectionDevice:
+            (database
+              .select()
+              .from(circuitProtectionDevices)
+              .where(eq(circuitProtectionDevices.circuitId, circuit.id))
+              .get() as CircuitProtectionDeviceSnapshot | undefined) ??
+            null,
+        };
+      });
+    return {
+      group: {
+        ...group,
+        category: group.category,
+        groupNumber: group.groupNumber,
+      },
+      components,
+      circuits: circuitSnapshots,
+    };
+  }
+
+  private restore(
+    database: AppDatabase,
+    projectId: string,
+    snapshot: CircuitGroupSubtreeSnapshot
+  ) {
+    this.assertListOwnership(
+      database,
+      projectId,
+      snapshot.group.circuitListId
+    );
+    const existing = database
+      .select({ id: circuitSections.id })
+      .from(circuitSections)
+      .where(eq(circuitSections.id, snapshot.group.id))
+      .get();
+    if (existing) {
+      throw new Error("Circuit group already exists before restoration.");
+    }
+    database.insert(circuitSections).values(snapshot.group).run();
+    for (const component of snapshot.components) {
+      database
+        .insert(distributionBoardComponents)
+        .values(component.component)
+        .run();
+      if (component.protectionDevice !== null) {
+        database
+          .insert(distributionBoardComponentProtectionDevices)
+          .values(component.protectionDevice)
+          .run();
+      }
+    }
+    for (const entry of snapshot.circuits) {
+      const { deviceRows, isReserve, ...circuit } = entry.circuit;
+      database
+        .insert(circuits)
+        .values({ ...circuit, isReserve: isReserve ? 1 : 0 })
+        .run();
+      if (entry.protectionDevice !== null) {
+        database
+          .insert(circuitProtectionDevices)
+          .values(entry.protectionDevice)
+          .run();
+      }
+      if (deviceRows.length > 0) {
+        database.insert(circuitDeviceRows).values(deviceRows).run();
+      }
+    }
+  }
+
+  private assertListOwnership(
+    database: AppDatabase,
+    projectId: string,
+    circuitListId: string
+  ) {
+    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.");
+    }
+  }
+}
+
+function sameSnapshot(
+  left: CircuitGroupSubtreeSnapshot,
+  right: CircuitGroupSubtreeSnapshot
+) {
+  return canonicalJson(left) === canonicalJson(right);
+}
+
+function canonicalJson(value: unknown): string {
+  if (Array.isArray(value)) {
+    return `[${value.map(canonicalJson).join(",")}]`;
+  }
+  if (value !== null && typeof value === "object") {
+    return `{${Object.entries(value)
+      .sort(([left], [right]) => left.localeCompare(right))
+      .map(
+        ([key, child]) =>
+          `${JSON.stringify(key)}:${canonicalJson(child)}`
+      )
+      .join(",")}}`;
+  }
+  return JSON.stringify(value) ?? "null";
+}

src/db/repositories/circuit-protection-device.repository.ts

@@ -0,0 +1,17 @@
+import { inArray } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import { circuitProtectionDevices } from "../schema/circuit-protection-devices.js";
+
+export class CircuitProtectionDeviceRepository {
+  constructor(private readonly database: AppDatabase) {}
+
+  async listByCircuitIds(circuitIds: string[]) {
+    if (circuitIds.length === 0) {
+      return [];
+    }
+    return this.database
+      .select()
+      .from(circuitProtectionDevices)
+      .where(inArray(circuitProtectionDevices.circuitId, circuitIds));
+  }
+}

src/db/repositories/distribution-board-component.repository.ts

@@ -0,0 +1,36 @@
+import { asc, eq, inArray } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import { distributionBoardComponentProtectionDevices } from "../schema/distribution-board-component-protection-devices.js";
+import { distributionBoardComponents } from "../schema/distribution-board-components.js";
+
+export class DistributionBoardComponentRepository {
+  constructor(private readonly database: AppDatabase) {}
+
+  async listByCircuitList(circuitListId: string) {
+    return this.database
+      .select()
+      .from(distributionBoardComponents)
+      .where(
+        eq(distributionBoardComponents.circuitListId, circuitListId)
+      )
+      .orderBy(
+        asc(distributionBoardComponents.sortOrder),
+        asc(distributionBoardComponents.id)
+      );
+  }
+
+  async listProtectionByComponentIds(componentIds: string[]) {
+    if (componentIds.length === 0) {
+      return [];
+    }
+    return this.database
+      .select()
+      .from(distributionBoardComponentProtectionDevices)
+      .where(
+        inArray(
+          distributionBoardComponentProtectionDevices.componentId,
+          componentIds
+        )
+      );
+  }
+}

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

@@ -0,0 +1,92 @@
+import { parseGroupedEquipmentIdentifier } from "../services/circuit-group-numbering.js";
+import type { CircuitGroupMovePlan } from "../services/circuit-group-move-planning.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const circuitGroupMoveCommandType = "circuit.move-group" as const;
+export const circuitGroupMoveCommandSchemaVersion = 1 as const;
+
+export interface CircuitGroupMoveProjectCommand
+  extends SerializedProjectCommand<CircuitGroupMovePlan> {
+  schemaVersion: typeof circuitGroupMoveCommandSchemaVersion;
+  type: typeof circuitGroupMoveCommandType;
+}
+
+export function createCircuitGroupMoveProjectCommand(
+  plan: CircuitGroupMovePlan
+): CircuitGroupMoveProjectCommand {
+  const command: CircuitGroupMoveProjectCommand = {
+    schemaVersion: circuitGroupMoveCommandSchemaVersion,
+    type: circuitGroupMoveCommandType,
+    payload: plan,
+  };
+  assertCircuitGroupMoveProjectCommand(command);
+  return command;
+}
+
+export function assertCircuitGroupMoveProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupMoveProjectCommand {
+  if (
+    command.schemaVersion !== circuitGroupMoveCommandSchemaVersion ||
+    command.type !== circuitGroupMoveCommandType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 8
+  ) {
+    throw new Error("Unsupported circuit group-move command.");
+  }
+  for (const field of [
+    "circuitId",
+    "circuitListId",
+    "expectedSectionId",
+    "targetSectionId",
+    "expectedEquipmentIdentifier",
+    "targetEquipmentIdentifier",
+  ] as const) {
+    if (
+      typeof command.payload[field] !== "string" ||
+      !command.payload[field].trim()
+    ) {
+      throw new Error(`Circuit group-move ${field} is invalid.`);
+    }
+  }
+  if (
+    command.payload.expectedSectionId === command.payload.targetSectionId ||
+    !Number.isFinite(command.payload.expectedSortOrder) ||
+    !Number.isFinite(command.payload.targetSortOrder)
+  ) {
+    throw new Error("Circuit group-move positions are invalid.");
+  }
+  const expected = parseGroupedEquipmentIdentifier(
+    command.payload.expectedEquipmentIdentifier as string
+  );
+  const target = parseGroupedEquipmentIdentifier(
+    command.payload.targetEquipmentIdentifier as string
+  );
+  if (
+    expected?.kind !== "circuit" ||
+    target?.kind !== "circuit" ||
+    expected.category !== target.category ||
+    expected.groupNumber === target.groupNumber
+  ) {
+    throw new Error("Circuit group-move BMKs are incompatible.");
+  }
+}
+
+export function invertCircuitGroupMovePlan(
+  plan: CircuitGroupMovePlan
+): CircuitGroupMovePlan {
+  return {
+    circuitId: plan.circuitId,
+    circuitListId: plan.circuitListId,
+    expectedSectionId: plan.targetSectionId,
+    targetSectionId: plan.expectedSectionId,
+    expectedEquipmentIdentifier: plan.targetEquipmentIdentifier,
+    targetEquipmentIdentifier: plan.expectedEquipmentIdentifier,
+    expectedSortOrder: plan.targetSortOrder,
+    targetSortOrder: plan.expectedSortOrder,
+  };
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

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/models/circuit-group-structure-project-command.model.ts

@@ -0,0 +1,262 @@
+import {
+  circuitGroupCategories,
+  type CircuitGroupCategory,
+} from "../../shared/constants/circuit-group.js";
+import { formatCircuitGroupPrefix } from "../services/circuit-group-numbering.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const circuitGroupInsertCommandType = "circuit-group.insert" as const;
+export const circuitGroupDeleteCommandType = "circuit-group.delete" as const;
+export const circuitGroupUpdateCommandType = "circuit-group.update" as const;
+export const circuitGroupReorderCommandType = "circuit-group.reorder" as const;
+export const circuitGroupStructureCommandSchemaVersion = 1 as const;
+
+export interface CircuitGroupSnapshot {
+  id: string;
+  circuitListId: string;
+  key: string;
+  displayName: string;
+  prefix: string;
+  sortOrder: number;
+  category: CircuitGroupCategory;
+  groupNumber: number;
+}
+
+interface SnapshotPayload {
+  snapshot: CircuitGroupSnapshot;
+}
+
+interface UpdatePayload {
+  expected: CircuitGroupSnapshot;
+  target: CircuitGroupSnapshot;
+}
+
+export interface CircuitGroupReorderAssignment {
+  groupId: string;
+  expectedSortOrder: number;
+  targetSortOrder: number;
+}
+
+interface ReorderPayload {
+  circuitListId: string;
+  assignments: CircuitGroupReorderAssignment[];
+}
+
+export interface CircuitGroupInsertProjectCommand
+  extends SerializedProjectCommand<SnapshotPayload> {
+  schemaVersion: typeof circuitGroupStructureCommandSchemaVersion;
+  type: typeof circuitGroupInsertCommandType;
+}
+
+export interface CircuitGroupDeleteProjectCommand
+  extends SerializedProjectCommand<SnapshotPayload> {
+  schemaVersion: typeof circuitGroupStructureCommandSchemaVersion;
+  type: typeof circuitGroupDeleteCommandType;
+}
+
+export interface CircuitGroupUpdateProjectCommand
+  extends SerializedProjectCommand<UpdatePayload> {
+  schemaVersion: typeof circuitGroupStructureCommandSchemaVersion;
+  type: typeof circuitGroupUpdateCommandType;
+}
+
+export interface CircuitGroupReorderProjectCommand
+  extends SerializedProjectCommand<ReorderPayload> {
+  schemaVersion: typeof circuitGroupStructureCommandSchemaVersion;
+  type: typeof circuitGroupReorderCommandType;
+}
+
+export type CircuitGroupStructureProjectCommand =
+  | CircuitGroupInsertProjectCommand
+  | CircuitGroupDeleteProjectCommand
+  | CircuitGroupUpdateProjectCommand
+  | CircuitGroupReorderProjectCommand;
+
+export function createCircuitGroupInsertProjectCommand(
+  snapshot: CircuitGroupSnapshot
+): CircuitGroupInsertProjectCommand {
+  const command: CircuitGroupInsertProjectCommand = {
+    schemaVersion: circuitGroupStructureCommandSchemaVersion,
+    type: circuitGroupInsertCommandType,
+    payload: { snapshot },
+  };
+  assertCircuitGroupInsertProjectCommand(command);
+  return command;
+}
+
+export function createCircuitGroupDeleteProjectCommand(
+  snapshot: CircuitGroupSnapshot
+): CircuitGroupDeleteProjectCommand {
+  const command: CircuitGroupDeleteProjectCommand = {
+    schemaVersion: circuitGroupStructureCommandSchemaVersion,
+    type: circuitGroupDeleteCommandType,
+    payload: { snapshot },
+  };
+  assertCircuitGroupDeleteProjectCommand(command);
+  return command;
+}
+
+export function createCircuitGroupUpdateProjectCommand(
+  expected: CircuitGroupSnapshot,
+  target: CircuitGroupSnapshot
+): CircuitGroupUpdateProjectCommand {
+  const command: CircuitGroupUpdateProjectCommand = {
+    schemaVersion: circuitGroupStructureCommandSchemaVersion,
+    type: circuitGroupUpdateCommandType,
+    payload: { expected, target },
+  };
+  assertCircuitGroupUpdateProjectCommand(command);
+  return command;
+}
+
+export function createCircuitGroupReorderProjectCommand(
+  circuitListId: string,
+  assignments: CircuitGroupReorderAssignment[]
+): CircuitGroupReorderProjectCommand {
+  const command: CircuitGroupReorderProjectCommand = {
+    schemaVersion: circuitGroupStructureCommandSchemaVersion,
+    type: circuitGroupReorderCommandType,
+    payload: { circuitListId, assignments },
+  };
+  assertCircuitGroupReorderProjectCommand(command);
+  return command;
+}
+
+export function assertCircuitGroupInsertProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupInsertProjectCommand {
+  assertSnapshotCommand(command, circuitGroupInsertCommandType);
+}
+
+export function assertCircuitGroupDeleteProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupDeleteProjectCommand {
+  assertSnapshotCommand(command, circuitGroupDeleteCommandType);
+}
+
+export function assertCircuitGroupUpdateProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupUpdateProjectCommand {
+  if (
+    command.schemaVersion !== circuitGroupStructureCommandSchemaVersion ||
+    command.type !== circuitGroupUpdateCommandType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 2
+  ) {
+    throw new Error("Unsupported circuit-group update command.");
+  }
+  assertCircuitGroupSnapshot(command.payload.expected);
+  assertCircuitGroupSnapshot(command.payload.target);
+  for (const field of [
+    "id",
+    "circuitListId",
+    "key",
+    "prefix",
+    "sortOrder",
+    "category",
+    "groupNumber",
+  ] as const) {
+    if (command.payload.expected[field] !== command.payload.target[field]) {
+      throw new Error(
+        "Circuit-group updates can only change the display name."
+      );
+    }
+  }
+}
+
+export function assertCircuitGroupReorderProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupReorderProjectCommand {
+  if (
+    command.schemaVersion !== circuitGroupStructureCommandSchemaVersion ||
+    command.type !== circuitGroupReorderCommandType ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 2 ||
+    typeof command.payload.circuitListId !== "string" ||
+    !command.payload.circuitListId.trim() ||
+    !Array.isArray(command.payload.assignments) ||
+    command.payload.assignments.length === 0
+  ) {
+    throw new Error("Unsupported circuit-group reorder command.");
+  }
+  const groupIds = new Set<string>();
+  let hasChange = false;
+  for (const assignment of command.payload.assignments) {
+    if (
+      !isPlainObject(assignment) ||
+      typeof assignment.groupId !== "string" ||
+      !assignment.groupId.trim() ||
+      !Number.isFinite(assignment.expectedSortOrder) ||
+      !Number.isFinite(assignment.targetSortOrder) ||
+      groupIds.has(assignment.groupId)
+    ) {
+      throw new Error(
+        "Circuit-group reorder contains an invalid or duplicate assignment."
+      );
+    }
+    hasChange ||= assignment.expectedSortOrder !== assignment.targetSortOrder;
+    groupIds.add(assignment.groupId);
+  }
+  if (!hasChange) {
+    throw new Error("Circuit-group reorder must change at least one position.");
+  }
+}
+
+function assertSnapshotCommand(
+  command: SerializedProjectCommand<unknown>,
+  type:
+    | typeof circuitGroupInsertCommandType
+    | typeof circuitGroupDeleteCommandType
+) {
+  if (
+    command.schemaVersion !== circuitGroupStructureCommandSchemaVersion ||
+    command.type !== type ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 1
+  ) {
+    throw new Error("Unsupported circuit-group structure command.");
+  }
+  assertCircuitGroupSnapshot(command.payload.snapshot);
+}
+
+export function assertCircuitGroupSnapshot(
+  value: unknown
+): asserts value is CircuitGroupSnapshot {
+  if (!isPlainObject(value) || Object.keys(value).length !== 8) {
+    throw new Error("Circuit-group snapshot is invalid.");
+  }
+  for (const field of [
+    "id",
+    "circuitListId",
+    "key",
+    "displayName",
+    "prefix",
+  ] as const) {
+    if (typeof value[field] !== "string" || !value[field].trim()) {
+      throw new Error(`${field} must be a non-empty string.`);
+    }
+  }
+  if (
+    !circuitGroupCategories.includes(
+      value.category as CircuitGroupCategory
+    ) ||
+    !Number.isInteger(value.groupNumber) ||
+    (value.groupNumber as number) < 1 ||
+    !Number.isFinite(value.sortOrder)
+  ) {
+    throw new Error("Circuit-group category, number or order is invalid.");
+  }
+  if (
+    value.prefix !==
+    formatCircuitGroupPrefix(
+      value.category as CircuitGroupCategory,
+      value.groupNumber as number
+    )
+  ) {
+    throw new Error("Circuit-group prefix does not match its category and number.");
+  }
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

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

@@ -0,0 +1,88 @@
+import {
+  assertCircuitGroupSubtreeSnapshot,
+  type CircuitGroupSubtreeSnapshot,
+} from "./circuit-group-subtree-snapshot.model.js";
+import type { SerializedProjectCommand } from "./project-command.model.js";
+
+export const circuitGroupDeleteSubtreeCommandType =
+  "circuit-group.delete-subtree" as const;
+export const circuitGroupRestoreSubtreeCommandType =
+  "circuit-group.restore-subtree" as const;
+export const circuitGroupSubtreeCommandSchemaVersion = 1 as const;
+
+interface Payload {
+  snapshot: CircuitGroupSubtreeSnapshot;
+}
+
+export interface CircuitGroupDeleteSubtreeProjectCommand
+  extends SerializedProjectCommand<Payload> {
+  schemaVersion: typeof circuitGroupSubtreeCommandSchemaVersion;
+  type: typeof circuitGroupDeleteSubtreeCommandType;
+}
+
+export interface CircuitGroupRestoreSubtreeProjectCommand
+  extends SerializedProjectCommand<Payload> {
+  schemaVersion: typeof circuitGroupSubtreeCommandSchemaVersion;
+  type: typeof circuitGroupRestoreSubtreeCommandType;
+}
+
+export type CircuitGroupSubtreeProjectCommand =
+  | CircuitGroupDeleteSubtreeProjectCommand
+  | CircuitGroupRestoreSubtreeProjectCommand;
+
+export function createCircuitGroupDeleteSubtreeProjectCommand(
+  snapshot: CircuitGroupSubtreeSnapshot
+): CircuitGroupDeleteSubtreeProjectCommand {
+  const command: CircuitGroupDeleteSubtreeProjectCommand = {
+    schemaVersion: circuitGroupSubtreeCommandSchemaVersion,
+    type: circuitGroupDeleteSubtreeCommandType,
+    payload: { snapshot },
+  };
+  assertCircuitGroupDeleteSubtreeProjectCommand(command);
+  return command;
+}
+
+export function createCircuitGroupRestoreSubtreeProjectCommand(
+  snapshot: CircuitGroupSubtreeSnapshot
+): CircuitGroupRestoreSubtreeProjectCommand {
+  const command: CircuitGroupRestoreSubtreeProjectCommand = {
+    schemaVersion: circuitGroupSubtreeCommandSchemaVersion,
+    type: circuitGroupRestoreSubtreeCommandType,
+    payload: { snapshot },
+  };
+  assertCircuitGroupRestoreSubtreeProjectCommand(command);
+  return command;
+}
+
+export function assertCircuitGroupDeleteSubtreeProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupDeleteSubtreeProjectCommand {
+  assertCommand(command, circuitGroupDeleteSubtreeCommandType);
+}
+
+export function assertCircuitGroupRestoreSubtreeProjectCommand(
+  command: SerializedProjectCommand<unknown>
+): asserts command is CircuitGroupRestoreSubtreeProjectCommand {
+  assertCommand(command, circuitGroupRestoreSubtreeCommandType);
+}
+
+function assertCommand(
+  command: SerializedProjectCommand<unknown>,
+  type:
+    | typeof circuitGroupDeleteSubtreeCommandType
+    | typeof circuitGroupRestoreSubtreeCommandType
+) {
+  if (
+    command.schemaVersion !== circuitGroupSubtreeCommandSchemaVersion ||
+    command.type !== type ||
+    !isPlainObject(command.payload) ||
+    Object.keys(command.payload).length !== 1
+  ) {
+    throw new Error("Unsupported circuit-group subtree command.");
+  }
+  assertCircuitGroupSubtreeSnapshot(command.payload.snapshot);
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

src/domain/models/circuit-group-subtree-snapshot.model.ts

@@ -0,0 +1,169 @@
+import type {
+  BreakerTripCharacteristic,
+  FuseUtilizationCategory,
+  ProtectionDeviceType,
+  RcdType,
+} from "../../shared/constants/protection-device.js";
+import { protectionDeviceConfigurationSchema } from "../../shared/validation/protection-device.schemas.js";
+import {
+  assertCircuitGroupSnapshot,
+  type CircuitGroupSnapshot,
+} from "./circuit-group-structure-project-command.model.js";
+import {
+  assertCircuitInsertProjectCommand,
+  circuitInsertCommandType,
+  circuitStructureCommandSchemaVersion,
+  type CircuitSnapshot,
+} from "./circuit-structure-project-command.model.js";
+import {
+  assertDistributionBoardComponentSnapshot,
+  type DistributionBoardComponentSnapshot,
+} from "./distribution-board-component-structure-project-command.model.js";
+
+export interface CircuitProtectionDeviceSnapshot {
+  circuitId: string;
+  type: ProtectionDeviceType;
+  ratedCurrentA: number;
+  fuseUtilizationCategory: FuseUtilizationCategory | null;
+  tripCharacteristic: BreakerTripCharacteristic | null;
+  rcdType: RcdType | null;
+  ratedResidualCurrentMa: number | null;
+}
+
+export interface CircuitGroupSubtreeSnapshot {
+  group: CircuitGroupSnapshot;
+  components: DistributionBoardComponentSnapshot[];
+  circuits: Array<{
+    circuit: CircuitSnapshot;
+    protectionDevice: CircuitProtectionDeviceSnapshot | null;
+  }>;
+}
+
+export interface CircuitGroupDeletionSummary {
+  hasUpstreamProtection: boolean;
+  hasResidualCurrentProtection: boolean;
+  circuitCount: number;
+  deviceRowCount: number;
+}
+
+export function assertCircuitGroupSubtreeSnapshot(
+  value: unknown
+): asserts value is CircuitGroupSubtreeSnapshot {
+  if (
+    !isPlainObject(value) ||
+    Object.keys(value).length !== 3 ||
+    !Array.isArray(value.components) ||
+    !Array.isArray(value.circuits)
+  ) {
+    throw new Error("Circuit-group subtree snapshot is invalid.");
+  }
+  assertCircuitGroupSnapshot(value.group);
+  const group = value.group;
+  const entityIds = new Set<string>();
+  const equipmentIdentifiers = new Set<string>();
+  for (const component of value.components) {
+    assertDistributionBoardComponentSnapshot(component);
+    if (
+      component.component.circuitListId !== group.circuitListId ||
+      component.component.sectionId !== group.id ||
+      entityIds.has(component.component.id) ||
+      equipmentIdentifiers.has(component.component.equipmentIdentifier)
+    ) {
+      throw new Error(
+        "Circuit-group component snapshot has invalid ownership or duplicates."
+      );
+    }
+    entityIds.add(component.component.id);
+    equipmentIdentifiers.add(component.component.equipmentIdentifier);
+  }
+  for (const entry of value.circuits) {
+    if (
+      !isPlainObject(entry) ||
+      Object.keys(entry).length !== 2 ||
+      !isPlainObject(entry.circuit)
+    ) {
+      throw new Error("Circuit-group circuit snapshot is invalid.");
+    }
+    assertCircuitInsertProjectCommand({
+      schemaVersion: circuitStructureCommandSchemaVersion,
+      type: circuitInsertCommandType,
+      payload: { circuit: entry.circuit },
+    });
+    const circuit = entry.circuit as unknown as CircuitSnapshot;
+    if (
+      circuit.circuitListId !== group.circuitListId ||
+      circuit.sectionId !== group.id ||
+      entityIds.has(circuit.id) ||
+      equipmentIdentifiers.has(circuit.equipmentIdentifier)
+    ) {
+      throw new Error(
+        "Circuit-group circuit snapshot has invalid ownership or duplicates."
+      );
+    }
+    entityIds.add(circuit.id);
+    equipmentIdentifiers.add(circuit.equipmentIdentifier);
+    if (entry.protectionDevice !== null) {
+      assertCircuitProtectionDeviceSnapshot(
+        entry.protectionDevice,
+        circuit.id
+      );
+    }
+  }
+}
+
+export function summarizeCircuitGroupDeletion(
+  snapshot: CircuitGroupSubtreeSnapshot
+): CircuitGroupDeletionSummary {
+  assertCircuitGroupSubtreeSnapshot(snapshot);
+  return {
+    hasUpstreamProtection: snapshot.components.some(
+      ({ component }) =>
+        component.role === "group_upstream_protection"
+    ),
+    hasResidualCurrentProtection: snapshot.components.some(
+      ({ component }) =>
+        component.role === "group_residual_current_protection"
+    ),
+    circuitCount: snapshot.circuits.length,
+    deviceRowCount: snapshot.circuits.reduce(
+      (count, { circuit }) => count + circuit.deviceRows.length,
+      0
+    ),
+  };
+}
+
+function assertCircuitProtectionDeviceSnapshot(
+  value: unknown,
+  circuitId: string
+): asserts value is CircuitProtectionDeviceSnapshot {
+  if (
+    !isPlainObject(value) ||
+    Object.keys(value).length !== 7 ||
+    value.circuitId !== circuitId
+  ) {
+    throw new Error("Circuit protection-device snapshot is invalid.");
+  }
+  const result = protectionDeviceConfigurationSchema.safeParse({
+    type: value.type,
+    ratedCurrentA: value.ratedCurrentA,
+    ...(value.fuseUtilizationCategory === null
+      ? {}
+      : { fuseUtilizationCategory: value.fuseUtilizationCategory }),
+    ...(value.tripCharacteristic === null
+      ? {}
+      : { tripCharacteristic: value.tripCharacteristic }),
+    ...(value.rcdType === null ? {} : { rcdType: value.rcdType }),
+    ...(value.ratedResidualCurrentMa === null
+      ? {}
+      : { ratedResidualCurrentMa: value.ratedResidualCurrentMa }),
+  });
+  if (!result.success) {
+    throw new Error(
+      "Circuit protection-device configuration is invalid."
+    );
+  }
+}
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}

src/domain/models/circuit-tree.model.ts

@@ -44,6 +44,7 @@ export interface CircuitTreeCircuit {
   remark?: string;
   circuitTotalPower: number;
   deviceRows: CircuitTreeDeviceRow[];
+  protectionDevice?: CircuitTreeProtectionDevice;
 }
 
 export interface CircuitTreeSectionBlock {
@@ -52,7 +53,10 @@ export interface CircuitTreeSectionBlock {
   displayName: string;
   prefix: string;
   sortOrder: number;
+  category?: CircuitGroupCategory;
+  groupNumber?: number;
   sectionTotalPower: number;
+  components: CircuitTreeComponent[];
   circuits: CircuitTreeCircuit[];
 }
 
@@ -64,7 +68,9 @@ export interface CircuitTreeResponse {
   distributionBoardSimultaneityFactor: number;
   distributionBoardTotalPower: number;
   distributionBoardTotalPowerWithSimultaneityFactor: number;
+  headerComponents: CircuitTreeComponent[];
   sections: CircuitTreeSectionBlock[];
+  footerComponents: CircuitTreeComponent[];
 }
 
 export interface LegacyMigrationReport {
@@ -78,3 +84,35 @@ export interface LegacyMigrationReport {
   warnings: string[];
 }
 
+import type { CircuitGroupCategory } from "../../shared/constants/circuit-group.js";
+import type {
+  DistributionBoardComponentPlacement,
+  DistributionBoardComponentRole,
+} from "../../shared/constants/distribution-board-component.js";
+import type {
+  BreakerTripCharacteristic,
+  FuseUtilizationCategory,
+  ProtectionDeviceType,
+  RcdType,
+} from "../../shared/constants/protection-device.js";
+
+export interface CircuitTreeProtectionDevice {
+  type: ProtectionDeviceType;
+  ratedCurrentA: number;
+  fuseUtilizationCategory?: FuseUtilizationCategory;
+  tripCharacteristic?: BreakerTripCharacteristic;
+  rcdType?: RcdType;
+  ratedResidualCurrentMa?: number;
+}
+
+export interface CircuitTreeComponent {
+  id: string;
+  circuitListId: string;
+  sectionId?: string;
+  equipmentIdentifier: string;
+  name: string;
+  role: DistributionBoardComponentRole;
+  placement: DistributionBoardComponentPlacement;
+  sortOrder: number;
+  protectionDevice?: CircuitTreeProtectionDevice;
+}

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

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

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/ports/circuit-group-structure-project-command.store.ts

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

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

@@ -0,0 +1,24 @@
+import type { CircuitGroupSubtreeSnapshot } from "../models/circuit-group-subtree-snapshot.model.js";
+import type { CircuitGroupSubtreeProjectCommand } from "../models/circuit-group-subtree-project-command.model.js";
+import type {
+  AppendedProjectRevision,
+  ProjectRevisionSource,
+} from "./project-revision.store.js";
+
+export interface ExecuteCircuitGroupSubtreeCommandInput {
+  projectId: string;
+  expectedRevision: number;
+  source: ProjectRevisionSource;
+  description?: string;
+  actorId?: string;
+  historyTargetChangeSetId?: string;
+  command: CircuitGroupSubtreeProjectCommand;
+}
+
+export interface CircuitGroupSubtreeProjectCommandStore {
+  capture(projectId: string, groupId: string): CircuitGroupSubtreeSnapshot;
+  execute(input: ExecuteCircuitGroupSubtreeCommandInput): {
+    revision: AppendedProjectRevision;
+    inverse: CircuitGroupSubtreeProjectCommand;
+  };
+}

src/domain/services/circuit-group-move-planning.ts

@@ -0,0 +1,97 @@
+import type { CircuitGroupCategory } from "../../shared/constants/circuit-group.js";
+import {
+  formatCircuitGroupPrefix,
+  getNextGroupedCircuitIdentifier,
+  parseGroupedEquipmentIdentifier,
+} from "./circuit-group-numbering.js";
+
+export interface CircuitMoveGroupIdentity {
+  id: string;
+  category: CircuitGroupCategory;
+  groupNumber: number;
+  prefix: string;
+}
+
+export interface CircuitGroupMovePlan {
+  circuitId: string;
+  circuitListId: string;
+  expectedSectionId: string;
+  targetSectionId: string;
+  expectedEquipmentIdentifier: string;
+  targetEquipmentIdentifier: string;
+  expectedSortOrder: number;
+  targetSortOrder: number;
+}
+
+export function createCircuitGroupMovePlan(input: {
+  circuit: {
+    id: string;
+    circuitListId: string;
+    sectionId: string;
+    equipmentIdentifier: string;
+    sortOrder: number;
+  };
+  sourceGroup: CircuitMoveGroupIdentity;
+  targetGroup: CircuitMoveGroupIdentity;
+  targetCircuitEquipmentIdentifiers: Iterable<string>;
+  targetSortOrder: number;
+}): CircuitGroupMovePlan {
+  assertGroupIdentity(input.sourceGroup);
+  assertGroupIdentity(input.targetGroup);
+  if (
+    input.sourceGroup.id === input.targetGroup.id ||
+    input.sourceGroup.category !== input.targetGroup.category
+  ) {
+    throw new Error(
+      "Circuits can move only between different groups of the same category."
+    );
+  }
+  if (
+    input.circuit.sectionId !== input.sourceGroup.id ||
+    !input.circuit.id.trim() ||
+    !input.circuit.circuitListId.trim() ||
+    !Number.isFinite(input.circuit.sortOrder) ||
+    !Number.isFinite(input.targetSortOrder)
+  ) {
+    throw new Error("Circuit move source or target position is invalid.");
+  }
+  const parsed = parseGroupedEquipmentIdentifier(
+    input.circuit.equipmentIdentifier
+  );
+  if (
+    parsed?.kind !== "circuit" ||
+    parsed.category !== input.sourceGroup.category ||
+    parsed.groupNumber !== input.sourceGroup.groupNumber
+  ) {
+    throw new Error("Circuit BMK does not match its source group.");
+  }
+
+  return {
+    circuitId: input.circuit.id,
+    circuitListId: input.circuit.circuitListId,
+    expectedSectionId: input.sourceGroup.id,
+    targetSectionId: input.targetGroup.id,
+    expectedEquipmentIdentifier:
+      input.circuit.equipmentIdentifier,
+    targetEquipmentIdentifier:
+      getNextGroupedCircuitIdentifier(
+        input.targetGroup.category,
+        input.targetGroup.groupNumber,
+        input.targetCircuitEquipmentIdentifiers
+      ),
+    expectedSortOrder: input.circuit.sortOrder,
+    targetSortOrder: input.targetSortOrder,
+  };
+}
+
+function assertGroupIdentity(group: CircuitMoveGroupIdentity) {
+  if (
+    !group.id.trim() ||
+    !Number.isInteger(group.groupNumber) ||
+    group.groupNumber < 1 ||
+    group.prefix !==
+      formatCircuitGroupPrefix(group.category, group.groupNumber)
+  ) {
+    throw new Error("Circuit move group identity is invalid.");
+  }
+}

src/domain/services/circuit-group-numbering.ts

@@ -36,6 +36,13 @@ function getGroupStem(
   return `-${circuitGroupCategoryNumbers[category]}${functionLetter}${groupNumber}`;
 }
 
+export function formatCircuitGroupPrefix(
+  category: CircuitGroupCategory,
+  groupNumber: number
+) {
+  return `${getGroupStem(category, "F", groupNumber)}.`;
+}
+
 export function formatGroupUpstreamProtectionIdentifier(
   category: CircuitGroupCategory,
   groupNumber: number

src/domain/services/circuit-group-renumbering.ts

@@ -0,0 +1,193 @@
+import type { CircuitGroupCategory } from "../../shared/constants/circuit-group.js";
+import {
+  formatCircuitGroupPrefix,
+  formatGroupRcdIdentifier,
+  formatGroupedCircuitIdentifier,
+  formatGroupUpstreamProtectionIdentifier,
+  parseGroupedEquipmentIdentifier,
+} from "./circuit-group-numbering.js";
+
+export interface RenumberableCircuitGroup {
+  id: string;
+  category: CircuitGroupCategory;
+  groupNumber: number;
+  prefix: string;
+  circuits: Array<{
+    id: string;
+    equipmentIdentifier: string;
+  }>;
+  components: Array<{
+    id: string;
+    role:
+      | "group_upstream_protection"
+      | "group_residual_current_protection";
+    equipmentIdentifier: string;
+  }>;
+}
+
+export interface CircuitGroupRenumberRequest {
+  groupId: string;
+  targetGroupNumber: number;
+}
+
+export interface CircuitGroupRenumberPlan {
+  groups: Array<{
+    groupId: string;
+    category: CircuitGroupCategory;
+    expectedGroupNumber: number;
+    targetGroupNumber: number;
+    expectedPrefix: string;
+    targetPrefix: string;
+    circuits: Array<{
+      circuitId: string;
+      expectedEquipmentIdentifier: string;
+      targetEquipmentIdentifier: string;
+    }>;
+    components: Array<{
+      componentId: string;
+      expectedEquipmentIdentifier: string;
+      targetEquipmentIdentifier: string;
+    }>;
+  }>;
+}
+
+export function createCircuitGroupRenumberPlan(
+  groups: RenumberableCircuitGroup[],
+  requests: CircuitGroupRenumberRequest[]
+): CircuitGroupRenumberPlan {
+  if (requests.length === 0) {
+    throw new Error("Circuit-group renumbering requires requests.");
+  }
+  const groupsById = new Map(groups.map((group) => [group.id, group]));
+  if (groupsById.size !== groups.length) {
+    throw new Error("Circuit-group renumbering contains duplicate group ids.");
+  }
+  const requestGroupIds = new Set<string>();
+  const targetKeys = new Set<string>();
+  const selected = requests.map((request) => {
+    const group = groupsById.get(request.groupId);
+    if (
+      !group ||
+      requestGroupIds.has(request.groupId) ||
+      !Number.isInteger(request.targetGroupNumber) ||
+      request.targetGroupNumber < 1
+    ) {
+      throw new Error("Circuit-group renumber request is invalid.");
+    }
+    const targetKey = `${group.category}:${request.targetGroupNumber}`;
+    if (targetKeys.has(targetKey)) {
+      throw new Error(
+        "Circuit-group renumbering contains duplicate target numbers."
+      );
+    }
+    requestGroupIds.add(request.groupId);
+    targetKeys.add(targetKey);
+    return { group, targetGroupNumber: request.targetGroupNumber };
+  });
+  if (
+    selected.every(
+      ({ group, targetGroupNumber }) =>
+        group.groupNumber === targetGroupNumber
+    )
+  ) {
+    throw new Error(
+      "Circuit-group renumbering must change at least one number."
+    );
+  }
+
+  for (const group of groups) {
+    if (
+      !requestGroupIds.has(group.id) &&
+      targetKeys.has(`${group.category}:${group.groupNumber}`)
+    ) {
+      throw new Error(
+        "Target group number belongs to an unchanged group."
+      );
+    }
+  }
+
+  return {
+    groups: selected.map(({ group, targetGroupNumber }) => {
+      assertCurrentGroupIdentity(group);
+      return {
+        groupId: group.id,
+        category: group.category,
+        expectedGroupNumber: group.groupNumber,
+        targetGroupNumber,
+        expectedPrefix: group.prefix,
+        targetPrefix: formatCircuitGroupPrefix(
+          group.category,
+          targetGroupNumber
+        ),
+        circuits: group.circuits.map((circuit) => {
+          const parsed = parseGroupedEquipmentIdentifier(
+            circuit.equipmentIdentifier
+          );
+          if (
+            parsed?.kind !== "circuit" ||
+            parsed.category !== group.category ||
+            parsed.groupNumber !== group.groupNumber ||
+            parsed.circuitNumber === null
+          ) {
+            throw new Error(
+              "Circuit BMK does not match its current group."
+            );
+          }
+          return {
+            circuitId: circuit.id,
+            expectedEquipmentIdentifier:
+              circuit.equipmentIdentifier,
+            targetEquipmentIdentifier:
+              formatGroupedCircuitIdentifier(
+                group.category,
+                targetGroupNumber,
+                parsed.circuitNumber
+              ),
+          };
+        }),
+        components: group.components.map((component) => {
+          const expected =
+            component.role === "group_upstream_protection"
+              ? formatGroupUpstreamProtectionIdentifier(
+                  group.category,
+                  group.groupNumber
+                )
+              : formatGroupRcdIdentifier(
+                  group.category,
+                  group.groupNumber
+                );
+          if (component.equipmentIdentifier !== expected) {
+            throw new Error(
+              "Group component BMK does not match its current group."
+            );
+          }
+          return {
+            componentId: component.id,
+            expectedEquipmentIdentifier: expected,
+            targetEquipmentIdentifier:
+              component.role === "group_upstream_protection"
+                ? formatGroupUpstreamProtectionIdentifier(
+                    group.category,
+                    targetGroupNumber
+                  )
+                : formatGroupRcdIdentifier(
+                    group.category,
+                    targetGroupNumber
+                  ),
+          };
+        }),
+      };
+    }),
+  };
+}
+
+function assertCurrentGroupIdentity(group: RenumberableCircuitGroup) {
+  if (
+    !Number.isInteger(group.groupNumber) ||
+    group.groupNumber < 1 ||
+    group.prefix !==
+      formatCircuitGroupPrefix(group.category, group.groupNumber)
+  ) {
+    throw new Error("Circuit group has an invalid current identity.");
+  }
+}

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

@@ -98,6 +98,10 @@ import type { CircuitProjectCommandStore } from "../ports/circuit-project-comman
 import type { CircuitSectionReorderProjectCommandStore } from "../ports/circuit-section-reorder-project-command.store.js";
 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 { CircuitGroupMoveProjectCommandStore } from "../ports/circuit-group-move-project-command.store.js";
+import type { CircuitGroupSubtreeProjectCommandStore } from "../ports/circuit-group-subtree-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 {
@@ -110,6 +114,30 @@ import type {
   ProjectHistoryDirection,
   ProjectHistoryStore,
 } from "../ports/project-history.store.js";
+import {
+  assertCircuitGroupDeleteProjectCommand,
+  assertCircuitGroupInsertProjectCommand,
+  assertCircuitGroupReorderProjectCommand,
+  assertCircuitGroupUpdateProjectCommand,
+  circuitGroupDeleteCommandType,
+  circuitGroupInsertCommandType,
+  circuitGroupReorderCommandType,
+  circuitGroupUpdateCommandType,
+} from "../models/circuit-group-structure-project-command.model.js";
+import {
+  assertCircuitGroupRenumberProjectCommand,
+  circuitGroupRenumberCommandType,
+} from "../models/circuit-group-renumber-project-command.model.js";
+import {
+  assertCircuitGroupMoveProjectCommand,
+  circuitGroupMoveCommandType,
+} from "../models/circuit-group-move-project-command.model.js";
+import {
+  assertCircuitGroupDeleteSubtreeProjectCommand,
+  assertCircuitGroupRestoreSubtreeProjectCommand,
+  circuitGroupDeleteSubtreeCommandType,
+  circuitGroupRestoreSubtreeCommandType,
+} from "../models/circuit-group-subtree-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";
@@ -145,6 +173,10 @@ export class ProjectCommandService implements ProjectCommandExecutor {
     private readonly projectSettingsStore: ProjectSettingsProjectCommandStore,
     private readonly projectStateRestoreStore: ProjectStateRestoreCommandStore,
     private readonly distributionBoardComponentStructureStore: DistributionBoardComponentStructureProjectCommandStore,
+    private readonly circuitGroupStructureStore: CircuitGroupStructureProjectCommandStore,
+    private readonly circuitGroupRenumberStore: CircuitGroupRenumberProjectCommandStore,
+    private readonly circuitGroupMoveStore: CircuitGroupMoveProjectCommandStore,
+    private readonly circuitGroupSubtreeStore: CircuitGroupSubtreeProjectCommandStore,
     private readonly historyStore: ProjectHistoryStore
   ) {}
 
@@ -333,6 +365,62 @@ export class ProjectCommandService implements ProjectCommandExecutor {
           command: input.command,
         }).revision;
       }
+      case circuitGroupInsertCommandType: {
+        assertCircuitGroupInsertProjectCommand(input.command);
+        return this.circuitGroupStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupDeleteCommandType: {
+        assertCircuitGroupDeleteProjectCommand(input.command);
+        return this.circuitGroupStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupUpdateCommandType: {
+        assertCircuitGroupUpdateProjectCommand(input.command);
+        return this.circuitGroupStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupReorderCommandType: {
+        assertCircuitGroupReorderProjectCommand(input.command);
+        return this.circuitGroupStructureStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupRenumberCommandType: {
+        assertCircuitGroupRenumberProjectCommand(input.command);
+        return this.circuitGroupRenumberStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupMoveCommandType: {
+        assertCircuitGroupMoveProjectCommand(input.command);
+        return this.circuitGroupMoveStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupDeleteSubtreeCommandType: {
+        assertCircuitGroupDeleteSubtreeProjectCommand(input.command);
+        return this.circuitGroupSubtreeStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
+      case circuitGroupRestoreSubtreeCommandType: {
+        assertCircuitGroupRestoreSubtreeProjectCommand(input.command);
+        return this.circuitGroupSubtreeStore.execute({
+          ...input,
+          command: input.command,
+        }).revision;
+      }
       case projectFloorInsertCommandType: {
         assertProjectFloorInsertProjectCommand(input.command);
         return this.projectLocationStructureStore.execute({

src/frontend/types.ts

@@ -1,4 +1,15 @@
 import type { DistributionBoardSupplyType } from "../shared/constants/distribution-board";
+import type { CircuitGroupCategory } from "../shared/constants/circuit-group";
+import type {
+  DistributionBoardComponentPlacement,
+  DistributionBoardComponentRole,
+} from "../shared/constants/distribution-board-component";
+import type {
+  BreakerTripCharacteristic,
+  FuseUtilizationCategory,
+  ProtectionDeviceType,
+  RcdType,
+} from "../shared/constants/protection-device";
 
 export interface ProjectDto {
   id: string;
@@ -267,6 +278,27 @@ export interface CircuitTreeDeviceRowDto {
   rowTotalPower: number;
 }
 
+export interface CircuitTreeProtectionDeviceDto {
+  type: ProtectionDeviceType;
+  ratedCurrentA: number;
+  fuseUtilizationCategory?: FuseUtilizationCategory;
+  tripCharacteristic?: BreakerTripCharacteristic;
+  rcdType?: RcdType;
+  ratedResidualCurrentMa?: number;
+}
+
+export interface CircuitTreeComponentDto {
+  id: string;
+  circuitListId: string;
+  sectionId?: string;
+  equipmentIdentifier: string;
+  name: string;
+  role: DistributionBoardComponentRole;
+  placement: DistributionBoardComponentPlacement;
+  sortOrder: number;
+  protectionDevice?: CircuitTreeProtectionDeviceDto;
+}
+
 export interface CircuitTreeCircuitDto {
   id: string;
   circuitListId: string;
@@ -289,6 +321,7 @@ export interface CircuitTreeCircuitDto {
   remark?: string;
   circuitTotalPower: number;
   deviceRows: CircuitTreeDeviceRowDto[];
+  protectionDevice?: CircuitTreeProtectionDeviceDto;
 }
 
 export interface CircuitTreeSectionDto {
@@ -297,7 +330,10 @@ export interface CircuitTreeSectionDto {
   displayName: string;
   prefix: string;
   sortOrder: number;
+  category?: CircuitGroupCategory;
+  groupNumber?: number;
   sectionTotalPower: number;
+  components: CircuitTreeComponentDto[];
   circuits: CircuitTreeCircuitDto[];
 }
 
@@ -320,7 +356,9 @@ export interface CircuitTreeResponseDto {
   distributionBoardSimultaneityFactor: number;
   distributionBoardTotalPower: number;
   distributionBoardTotalPowerWithSimultaneityFactor: number;
+  headerComponents: CircuitTreeComponentDto[];
   sections: CircuitTreeSectionDto[];
+  footerComponents: CircuitTreeComponentDto[];
   migrationReport?: CircuitTreeMigrationReportDto;
 }
 

src/frontend/utils/circuit-structure-projection.ts

@@ -0,0 +1,102 @@
+import type {
+  CircuitTreeCircuitDto,
+  CircuitTreeComponentDto,
+  CircuitTreeResponseDto,
+  CircuitTreeSectionDto,
+} from "../types.js";
+
+export type CircuitStructureProjectionRow =
+  | {
+      rowKey: string;
+      rowType: "headerComponent" | "footerComponent";
+      zone: "header" | "footer";
+      component: CircuitTreeComponentDto;
+    }
+  | {
+      rowKey: string;
+      rowType: "groupHeader" | "groupPlaceholder";
+      zone: "group";
+      section: CircuitTreeSectionDto;
+    }
+  | {
+      rowKey: string;
+      rowType: "groupComponent";
+      zone: "group";
+      section: CircuitTreeSectionDto;
+      component: CircuitTreeComponentDto;
+    }
+  | {
+      rowKey: string;
+      rowType: "circuitBlock";
+      zone: "group";
+      section: CircuitTreeSectionDto;
+      circuit: CircuitTreeCircuitDto;
+    };
+
+export function buildCircuitStructureProjection(
+  tree: Pick<
+    CircuitTreeResponseDto,
+    "headerComponents" | "sections" | "footerComponents"
+  >
+): CircuitStructureProjectionRow[] {
+  const rows: CircuitStructureProjectionRow[] = [];
+  for (const component of ordered(tree.headerComponents)) {
+    rows.push({
+      rowKey: `header-component:${component.id}`,
+      rowType: "headerComponent",
+      zone: "header",
+      component,
+    });
+  }
+  for (const section of ordered(tree.sections)) {
+    rows.push({
+      rowKey: `group:${section.id}`,
+      rowType: "groupHeader",
+      zone: "group",
+      section,
+    });
+    for (const component of ordered(section.components)) {
+      rows.push({
+        rowKey: `group-component:${component.id}`,
+        rowType: "groupComponent",
+        zone: "group",
+        section,
+        component,
+      });
+    }
+    for (const circuit of section.circuits) {
+      rows.push({
+        rowKey: `circuit-block:${circuit.id}`,
+        rowType: "circuitBlock",
+        zone: "group",
+        section,
+        circuit,
+      });
+    }
+    rows.push({
+      rowKey: `group-placeholder:${section.id}`,
+      rowType: "groupPlaceholder",
+      zone: "group",
+      section,
+    });
+  }
+  for (const component of ordered(tree.footerComponents)) {
+    rows.push({
+      rowKey: `footer-component:${component.id}`,
+      rowType: "footerComponent",
+      zone: "footer",
+      component,
+    });
+  }
+  return rows;
+}
+
+function ordered<T extends { id: string; sortOrder: number }>(
+  values: readonly T[]
+) {
+  return [...values].sort(
+    (left, right) =>
+      left.sortOrder - right.sortOrder ||
+      left.id.localeCompare(right.id)
+  );
+}

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

@@ -36,6 +36,14 @@ const commandTypeLabels: Record<string, string> = {
   "distribution-board-component.insert": "Verteilergerät angelegt",
   "distribution-board-component.delete": "Verteilergerät entfernt",
   "distribution-board-component.update": "Verteilergerät bearbeitet",
+  "circuit-group.insert": "Stromkreisgruppe angelegt",
+  "circuit-group.delete": "Stromkreisgruppe entfernt",
+  "circuit-group.update": "Stromkreisgruppe bearbeitet",
+  "circuit-group.reorder": "Stromkreisgruppen sortiert",
+  "circuit-group.renumber": "Stromkreisgruppen neu nummeriert",
+  "circuit.move-group": "Stromkreis in andere Gruppe verschoben",
+  "circuit-group.delete-subtree": "Stromkreisgruppe vollständig entfernt",
+  "circuit-group.restore-subtree": "Stromkreisgruppe vollständig wiederhergestellt",
   "project-floor.insert": "Geschoss angelegt",
   "project-floor.delete": "Geschoss entfernt",
   "project-room.insert": "Raum angelegt",

src/server/composition/application-repositories.ts

@@ -3,6 +3,8 @@ import { CircuitDeviceRowRepository } from "../../db/repositories/circuit-device
 import { CircuitListRepository } from "../../db/repositories/circuit-list.repository.js";
 import { CircuitSectionRepository } from "../../db/repositories/circuit-section.repository.js";
 import { CircuitRepository } from "../../db/repositories/circuit.repository.js";
+import { CircuitProtectionDeviceRepository } from "../../db/repositories/circuit-protection-device.repository.js";
+import { DistributionBoardComponentRepository } from "../../db/repositories/distribution-board-component.repository.js";
 import { DistributionBoardRepository } from "../../db/repositories/distribution-board.repository.js";
 import { FloorRepository } from "../../db/repositories/floor.repository.js";
 import { GlobalDeviceRepository } from "../../db/repositories/global-device.repository.js";
@@ -15,6 +17,10 @@ export const circuitDeviceRowRepository =
 export const circuitListRepository = new CircuitListRepository(db);
 export const circuitSectionRepository = new CircuitSectionRepository(db);
 export const circuitRepository = new CircuitRepository(db);
+export const circuitProtectionDeviceRepository =
+  new CircuitProtectionDeviceRepository(db);
+export const distributionBoardComponentRepository =
+  new DistributionBoardComponentRepository(db);
 export const distributionBoardRepository =
   new DistributionBoardRepository(db);
 export const floorRepository = new FloorRepository(db);

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

@@ -6,6 +6,10 @@ import { CircuitProjectCommandRepository } from "../../db/repositories/circuit-p
 import { CircuitSectionReorderProjectCommandRepository } from "../../db/repositories/circuit-section-reorder-project-command.repository.js";
 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 { CircuitGroupMoveProjectCommandRepository } from "../../db/repositories/circuit-group-move-project-command.repository.js";
+import { CircuitGroupSubtreeProjectCommandRepository } from "../../db/repositories/circuit-group-subtree-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";
@@ -26,6 +30,14 @@ export const circuitDeviceRowMoveProjectCommandStore =
   new CircuitDeviceRowMoveProjectCommandRepository(db);
 export const circuitStructureProjectCommandStore =
   new CircuitStructureProjectCommandRepository(db);
+export const circuitGroupStructureProjectCommandStore =
+  new CircuitGroupStructureProjectCommandRepository(db);
+export const circuitGroupRenumberProjectCommandStore =
+  new CircuitGroupRenumberProjectCommandRepository(db);
+export const circuitGroupMoveProjectCommandStore =
+  new CircuitGroupMoveProjectCommandRepository(db);
+export const circuitGroupSubtreeProjectCommandStore =
+  new CircuitGroupSubtreeProjectCommandRepository(db);
 export const distributionBoardStructureProjectCommandStore =
   new DistributionBoardStructureProjectCommandRepository(db);
 export const distributionBoardComponentStructureProjectCommandStore =
@@ -63,5 +75,9 @@ export const projectCommandService = new ProjectCommandService(
   projectSettingsProjectCommandStore,
   projectStateRestoreCommandStore,
   distributionBoardComponentStructureProjectCommandStore,
+  circuitGroupStructureProjectCommandStore,
+  circuitGroupRenumberProjectCommandStore,
+  circuitGroupMoveProjectCommandStore,
+  circuitGroupSubtreeProjectCommandStore,
   projectHistoryStore
 );

src/server/controllers/circuit-tree.controller.ts

@@ -7,11 +7,14 @@ import {
   calculateSectionTotalPower,
 } from "../../domain/calculations/circuit-power-calculation.js";
 import type { CircuitTreeResponse } from "../../domain/models/circuit-tree.model.js";
+import type { CircuitTreeProtectionDevice } from "../../domain/models/circuit-tree.model.js";
 import {
   circuitDeviceRowRepository,
   circuitListRepository,
+  circuitProtectionDeviceRepository,
   circuitRepository,
   circuitSectionRepository,
+  distributionBoardComponentRepository,
   distributionBoardRepository,
   projectRepository,
 } from "../composition/application-repositories.js";
@@ -23,7 +26,9 @@ export function isMissingCircuitTreeSchemaError(error: unknown): boolean {
   return (
     error.message.includes("no such table: circuit_sections") ||
     error.message.includes("no such table: circuits") ||
-    error.message.includes("no such table: circuit_device_rows")
+    error.message.includes("no such table: circuit_device_rows") ||
+    error.message.includes("no such table: distribution_board_components") ||
+    error.message.includes("no such table: circuit_protection_devices")
   );
 }
 
@@ -56,9 +61,28 @@ export async function getCircuitTree(req: Request, res: Response) {
     const sections = await circuitSectionRepository.listByCircuitList(circuitListId);
     const circuits = await circuitRepository.listByCircuitList(circuitListId);
     const rows = await circuitDeviceRowRepository.listByCircuitList(circuits.map((entry) => entry.id));
+    const components =
+      await distributionBoardComponentRepository.listByCircuitList(
+        circuitListId
+      );
+    const [circuitProtections, componentProtections] =
+      await Promise.all([
+        circuitProtectionDeviceRepository.listByCircuitIds(
+          circuits.map((entry) => entry.id)
+        ),
+        distributionBoardComponentRepository.listProtectionByComponentIds(
+          components.map((entry) => entry.id)
+        ),
+      ]);
 
     const sectionById = new Map(sections.map((section) => [section.id, section]));
     const rowsByCircuitId = new Map<string, typeof rows>();
+    const circuitProtectionById = new Map(
+      circuitProtections.map((entry) => [entry.circuitId, entry])
+    );
+    const componentProtectionById = new Map(
+      componentProtections.map((entry) => [entry.componentId, entry])
+    );
     for (const row of rows) {
       if (!rowsByCircuitId.has(row.circuitId)) {
         rowsByCircuitId.set(row.circuitId, []);
@@ -75,17 +99,46 @@ export async function getCircuitTree(req: Request, res: Response) {
         distributionBoard.simultaneityFactor,
       distributionBoardTotalPower: 0,
       distributionBoardTotalPowerWithSimultaneityFactor: 0,
+      headerComponents: [],
       sections: sections.map((section) => ({
         id: section.id,
         key: section.key,
         displayName: section.displayName,
         prefix: section.prefix,
         sortOrder: section.sortOrder,
+        category: section.category ?? undefined,
+        groupNumber: section.groupNumber ?? undefined,
         sectionTotalPower: 0,
+        components: [],
         circuits: [],
       })),
+      footerComponents: [],
     };
     const sectionBlocks = new Map(tree.sections.map((section) => [section.id, section]));
+    for (const component of components) {
+      const protection =
+        componentProtectionById.get(component.id);
+      const dto = {
+        id: component.id,
+        circuitListId: component.circuitListId,
+        sectionId: component.sectionId ?? undefined,
+        equipmentIdentifier: component.equipmentIdentifier,
+        name: component.name,
+        role: component.role,
+        placement: component.placement,
+        sortOrder: component.sortOrder,
+        protectionDevice: protection
+          ? toProtectionDeviceDto(protection)
+          : undefined,
+      };
+      if (component.placement === "header") {
+        tree.headerComponents.push(dto);
+      } else if (component.placement === "footer") {
+        tree.footerComponents.push(dto);
+      } else if (component.sectionId !== null) {
+        sectionBlocks.get(component.sectionId)?.components.push(dto);
+      }
+    }
 
     for (const circuit of circuits) {
       const section = sectionById.get(circuit.sectionId);
@@ -116,6 +169,7 @@ export async function getCircuitTree(req: Request, res: Response) {
         rowTotalPower: calculateRowTotalPower(row.quantity, row.powerPerUnit, row.simultaneityFactor),
       }));
       const circuitTotalPower = calculateCircuitTotalPower(deviceRows);
+      const protection = circuitProtectionById.get(circuit.id);
 
       sectionBlocks.get(section.id)?.circuits.push({
         id: circuit.id,
@@ -139,6 +193,9 @@ export async function getCircuitTree(req: Request, res: Response) {
         remark: circuit.remark ?? undefined,
         circuitTotalPower,
         deviceRows,
+        protectionDevice: protection
+          ? toProtectionDeviceDto(protection)
+          : undefined,
       });
     }
 
@@ -167,7 +224,9 @@ export async function getCircuitTree(req: Request, res: Response) {
           distributionBoard.simultaneityFactor,
         distributionBoardTotalPower: 0,
         distributionBoardTotalPowerWithSimultaneityFactor: 0,
+        headerComponents: [],
         sections: [],
+        footerComponents: [],
         warning:
           "Circuit-first tables are not available yet. Run database migrations (including 0008_circuit_first_model).",
       });
@@ -175,3 +234,23 @@ export async function getCircuitTree(req: Request, res: Response) {
     throw error;
   }
 }
+
+function toProtectionDeviceDto(value: {
+  type: CircuitTreeProtectionDevice["type"];
+  ratedCurrentA: number;
+  fuseUtilizationCategory: CircuitTreeProtectionDevice["fuseUtilizationCategory"] | null;
+  tripCharacteristic: CircuitTreeProtectionDevice["tripCharacteristic"] | null;
+  rcdType: CircuitTreeProtectionDevice["rcdType"] | null;
+  ratedResidualCurrentMa: number | null;
+}): CircuitTreeProtectionDevice {
+  return {
+    type: value.type,
+    ratedCurrentA: value.ratedCurrentA,
+    fuseUtilizationCategory:
+      value.fuseUtilizationCategory ?? undefined,
+    tripCharacteristic: value.tripCharacteristic ?? undefined,
+    rcdType: value.rcdType ?? undefined,
+    ratedResidualCurrentMa:
+      value.ratedResidualCurrentMa ?? undefined,
+  };
+}

tests/circuit-grid-projection.test.ts

@@ -10,6 +10,7 @@ import type {
   CircuitTreeDeviceRowDto,
   CircuitTreeSectionDto,
 } from "../src/frontend/types.js";
+import "./circuit-structure-projection.test.js";
 
 function makeDevice(
   id: string,

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

@@ -0,0 +1,305 @@
+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 { CircuitGroupMoveProjectCommandRepository } from "../src/db/repositories/circuit-group-move-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 { circuitLists } from "../src/db/schema/circuit-lists.js";
+import { circuitProtectionDevices } from "../src/db/schema/circuit-protection-devices.js";
+import { circuitSections } from "../src/db/schema/circuit-sections.js";
+import { circuits } from "../src/db/schema/circuits.js";
+import { projectRevisions } from "../src/db/schema/project-revisions.js";
+import { projects } from "../src/db/schema/projects.js";
+import { createCircuitGroupMoveProjectCommand } from "../src/domain/models/circuit-group-move-project-command.model.js";
+import { createCircuitGroupMovePlan } from "../src/domain/services/circuit-group-move-planning.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 source = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.category, "lighting"))
+    .get()!;
+  context.db
+    .insert(circuitSections)
+    .values({
+      id: "lighting-move-target",
+      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-move",
+        circuitListId: list.id,
+        sectionId: source.id,
+        equipmentIdentifier: "-1F1.7",
+        displayName: "Zu verschieben",
+        sortOrder: 20,
+      },
+      {
+        id: "circuit-target-existing",
+        circuitListId: list.id,
+        sectionId: "lighting-move-target",
+        equipmentIdentifier: "-1F2.4",
+        displayName: "Bestand",
+        sortOrder: 10,
+      },
+    ])
+    .run();
+  context.db
+    .insert(circuitDeviceRows)
+    .values({
+      id: "row-move",
+      circuitId: "circuit-move",
+      sortOrder: 10,
+      name: "Leuchte",
+      displayName: "Leuchte",
+      quantity: 2,
+      powerPerUnit: 0.1,
+      simultaneityFactor: 1,
+    })
+    .run();
+  context.db
+    .insert(circuitProtectionDevices)
+    .values({
+      circuitId: "circuit-move",
+      type: "LS",
+      ratedCurrentA: 10,
+      tripCharacteristic: "B",
+    })
+    .run();
+  return context;
+}
+
+function createMoveCommand(context: DatabaseContext) {
+  const circuit = context.db
+    .select()
+    .from(circuits)
+    .where(eq(circuits.id, "circuit-move"))
+    .get()!;
+  const source = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.id, circuit.sectionId))
+    .get()!;
+  const target = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.id, "lighting-move-target"))
+    .get()!;
+  return createCircuitGroupMoveProjectCommand(
+    createCircuitGroupMovePlan({
+      circuit,
+      sourceGroup: {
+        id: source.id,
+        category: source.category!,
+        groupNumber: source.groupNumber!,
+        prefix: source.prefix,
+      },
+      targetGroup: {
+        id: target.id,
+        category: target.category!,
+        groupNumber: target.groupNumber!,
+        prefix: target.prefix,
+      },
+      targetCircuitEquipmentIdentifiers: context.db
+        .select({ value: circuits.equipmentIdentifier })
+        .from(circuits)
+        .where(eq(circuits.sectionId, target.id))
+        .all()
+        .map(({ value }) => value),
+      targetSortOrder: 30,
+    })
+  );
+}
+
+describe("circuit group-move project command", () => {
+  it("moves a complete circuit while preserving rows and protection through undo/redo", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createMoveCommand(context);
+      const repository =
+        new CircuitGroupMoveProjectCommandRepository(context.db);
+      const moved = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.deepEqual(
+        context.db
+          .select({
+            sectionId: circuits.sectionId,
+            equipmentIdentifier: circuits.equipmentIdentifier,
+            sortOrder: circuits.sortOrder,
+          })
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-move"))
+          .get(),
+        {
+          sectionId: "lighting-move-target",
+          equipmentIdentifier: "-1F2.5",
+          sortOrder: 30,
+        }
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitDeviceRows)
+          .where(eq(circuitDeviceRows.id, "row-move"))
+          .get()?.circuitId,
+        "circuit-move"
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitProtectionDevices)
+          .where(eq(circuitProtectionDevices.circuitId, "circuit-move"))
+          .get()?.ratedCurrentA,
+        10
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: moved.inverse,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-move"))
+          .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-move"))
+          .get()?.equipmentIdentifier,
+        "-1F2.5"
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects stale state without moving the circuit", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createMoveCommand(context);
+      context.db
+        .update(circuits)
+        .set({ sortOrder: 99 })
+        .where(eq(circuits.id, "circuit-move"))
+        .run();
+      assert.throws(
+        () =>
+          new CircuitGroupMoveProjectCommandRepository(context.db).execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command,
+          }),
+        /changed before group move/
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-move"))
+          .get()?.sectionId,
+        command.payload.expectedSectionId
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back the circuit move when history persistence fails", () => {
+    const context = createTestDatabase();
+    try {
+      const command = createMoveCommand(context);
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_circuit_group_move_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced circuit group move history failure');
+        END;
+      `);
+      assert.throws(
+        () =>
+          new CircuitGroupMoveProjectCommandRepository(context.db).execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command,
+          }),
+        /forced circuit group move history failure/
+      );
+      assert.deepEqual(
+        context.db
+          .select({
+            sectionId: circuits.sectionId,
+            equipmentIdentifier: circuits.equipmentIdentifier,
+            sortOrder: circuits.sortOrder,
+          })
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-move"))
+          .get(),
+        {
+          sectionId: command.payload.expectedSectionId,
+          equipmentIdentifier: "-1F1.7",
+          sortOrder: 20,
+        }
+      );
+    } finally {
+      context.close();
+    }
+  });
+});

tests/circuit-group-numbering.test.ts

@@ -8,6 +8,13 @@ import {
   getNextGroupedCircuitIdentifier,
   parseGroupedEquipmentIdentifier,
 } 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";
+import { createCircuitGroupMovePlan } from "../src/domain/services/circuit-group-move-planning.js";
+import "./circuit-group-move-project-command.repository.test.js";
+import "./circuit-group-subtree-snapshot.test.js";
+import "./circuit-group-subtree-project-command.repository.test.js";
 
 describe("circuit group numbering", () => {
   it("formats the agreed identifiers including the leading hyphen", () => {
@@ -102,3 +109,252 @@ describe("circuit group numbering", () => {
     );
   });
 });
+
+describe("circuit group renumber planning", () => {
+  const groups = [
+    {
+      id: "lighting-1",
+      category: "lighting" as const,
+      groupNumber: 1,
+      prefix: "-1F1.",
+      circuits: [
+        { id: "circuit-1", equipmentIdentifier: "-1F1.1" },
+        { id: "circuit-2", equipmentIdentifier: "-1F1.7" },
+      ],
+      components: [
+        {
+          id: "fuse-1",
+          role: "group_upstream_protection" as const,
+          equipmentIdentifier: "-1F1.0",
+        },
+        {
+          id: "rcd-1",
+          role: "group_residual_current_protection" as const,
+          equipmentIdentifier: "-1Q1.0",
+        },
+      ],
+    },
+    {
+      id: "lighting-2",
+      category: "lighting" as const,
+      groupNumber: 2,
+      prefix: "-1F2.",
+      circuits: [
+        { id: "circuit-3", equipmentIdentifier: "-1F2.4" },
+      ],
+      components: [],
+    },
+    {
+      id: "single-1",
+      category: "single_phase" as const,
+      groupNumber: 1,
+      prefix: "-2F1.",
+      circuits: [],
+      components: [],
+    },
+  ];
+
+  it("preserves circuit suffixes and maps optional group components", () => {
+    const plan = createCircuitGroupRenumberPlan(groups, [
+      { groupId: "lighting-1", targetGroupNumber: 3 },
+    ]);
+    assert.deepEqual(plan.groups[0], {
+      groupId: "lighting-1",
+      category: "lighting",
+      expectedGroupNumber: 1,
+      targetGroupNumber: 3,
+      expectedPrefix: "-1F1.",
+      targetPrefix: "-1F3.",
+      circuits: [
+        {
+          circuitId: "circuit-1",
+          expectedEquipmentIdentifier: "-1F1.1",
+          targetEquipmentIdentifier: "-1F3.1",
+        },
+        {
+          circuitId: "circuit-2",
+          expectedEquipmentIdentifier: "-1F1.7",
+          targetEquipmentIdentifier: "-1F3.7",
+        },
+      ],
+      components: [
+        {
+          componentId: "fuse-1",
+          expectedEquipmentIdentifier: "-1F1.0",
+          targetEquipmentIdentifier: "-1F3.0",
+        },
+        {
+          componentId: "rcd-1",
+          expectedEquipmentIdentifier: "-1Q1.0",
+          targetEquipmentIdentifier: "-1Q3.0",
+        },
+      ],
+    });
+  });
+
+  it("allows a number swap when every affected group participates", () => {
+    const plan = createCircuitGroupRenumberPlan(groups, [
+      { groupId: "lighting-1", targetGroupNumber: 2 },
+      { groupId: "lighting-2", targetGroupNumber: 1 },
+    ]);
+    assert.deepEqual(
+      plan.groups.map((group) => [
+        group.expectedGroupNumber,
+        group.targetGroupNumber,
+      ]),
+      [
+        [1, 2],
+        [2, 1],
+      ]
+    );
+  });
+
+  it("rejects collisions, no-op requests and mismatched current BMKs", () => {
+    assert.throws(
+      () =>
+        createCircuitGroupRenumberPlan(groups, [
+          { groupId: "lighting-1", targetGroupNumber: 2 },
+        ]),
+      /unchanged group/
+    );
+    assert.throws(
+      () =>
+        createCircuitGroupRenumberPlan(groups, [
+          { groupId: "lighting-1", targetGroupNumber: 1 },
+        ]),
+      /must change/
+    );
+    assert.throws(
+      () =>
+        createCircuitGroupRenumberPlan(
+          [
+            {
+              ...groups[0],
+              circuits: [
+                {
+                  id: "circuit-1",
+                  equipmentIdentifier: "-1F9.1",
+                },
+              ],
+            },
+          ],
+          [{ groupId: "lighting-1", targetGroupNumber: 3 }]
+        ),
+      /Circuit BMK does not match/
+    );
+  });
+});
+
+describe("circuit group move planning", () => {
+  const sourceGroup = {
+    id: "lighting-1",
+    category: "lighting" as const,
+    groupNumber: 1,
+    prefix: "-1F1.",
+  };
+  const targetGroup = {
+    id: "lighting-2",
+    category: "lighting" as const,
+    groupNumber: 2,
+    prefix: "-1F2.",
+  };
+
+  it("uses the highest target suffix plus one and stores both positions", () => {
+    assert.deepEqual(
+      createCircuitGroupMovePlan({
+        circuit: {
+          id: "circuit-1",
+          circuitListId: "list-1",
+          sectionId: "lighting-1",
+          equipmentIdentifier: "-1F1.7",
+          sortOrder: 20,
+        },
+        sourceGroup,
+        targetGroup,
+        targetCircuitEquipmentIdentifiers: [
+          "-1F2.1",
+          "-1F2.4",
+          "-1F2.9",
+        ],
+        targetSortOrder: 40,
+      }),
+      {
+        circuitId: "circuit-1",
+        circuitListId: "list-1",
+        expectedSectionId: "lighting-1",
+        targetSectionId: "lighting-2",
+        expectedEquipmentIdentifier: "-1F1.7",
+        targetEquipmentIdentifier: "-1F2.10",
+        expectedSortOrder: 20,
+        targetSortOrder: 40,
+      }
+    );
+  });
+
+  it("does not fill target gaps", () => {
+    assert.equal(
+      createCircuitGroupMovePlan({
+        circuit: {
+          id: "circuit-1",
+          circuitListId: "list-1",
+          sectionId: "lighting-1",
+          equipmentIdentifier: "-1F1.2",
+          sortOrder: 10,
+        },
+        sourceGroup,
+        targetGroup,
+        targetCircuitEquipmentIdentifiers: ["-1F2.1", "-1F2.3"],
+        targetSortOrder: 20,
+      }).targetEquipmentIdentifier,
+      "-1F2.4"
+    );
+  });
+
+  it("rejects cross-category, same-group and mismatched source moves", () => {
+    const base = {
+      circuit: {
+        id: "circuit-1",
+        circuitListId: "list-1",
+        sectionId: "lighting-1",
+        equipmentIdentifier: "-1F1.1",
+        sortOrder: 10,
+      },
+      sourceGroup,
+      targetGroup,
+      targetCircuitEquipmentIdentifiers: [] as string[],
+      targetSortOrder: 10,
+    };
+    assert.throws(
+      () =>
+        createCircuitGroupMovePlan({
+          ...base,
+          targetGroup: {
+            id: "single-1",
+            category: "single_phase",
+            groupNumber: 1,
+            prefix: "-2F1.",
+          },
+        }),
+      /same category/
+    );
+    assert.throws(
+      () =>
+        createCircuitGroupMovePlan({
+          ...base,
+          targetGroup: sourceGroup,
+        }),
+      /different groups/
+    );
+    assert.throws(
+      () =>
+        createCircuitGroupMovePlan({
+          ...base,
+          circuit: {
+            ...base.circuit,
+            equipmentIdentifier: "-1F9.1",
+          },
+        }),
+      /does not match/
+    );
+  });
+});

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/circuit-group-structure-project-command.repository.test.ts

@@ -0,0 +1,430 @@
+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 { CircuitGroupStructureProjectCommandRepository } from "../src/db/repositories/circuit-group-structure-project-command.repository.js";
+import { ProjectHistoryRepository } from "../src/db/repositories/project-history.repository.js";
+import { circuitLists } from "../src/db/schema/circuit-lists.js";
+import { circuitSections } from "../src/db/schema/circuit-sections.js";
+import { circuits } from "../src/db/schema/circuits.js";
+import { projectRevisions } from "../src/db/schema/project-revisions.js";
+import { projects } from "../src/db/schema/projects.js";
+import {
+  createCircuitGroupDeleteProjectCommand,
+  createCircuitGroupInsertProjectCommand,
+  createCircuitGroupReorderProjectCommand,
+  createCircuitGroupUpdateProjectCommand,
+  type CircuitGroupSnapshot,
+} from "../src/domain/models/circuit-group-structure-project-command.model.js";
+import { DistributionBoardFixtureRepository } from "./support/distribution-board-fixture.js";
+
+function createTestDatabase(): DatabaseContext {
+  const context = createDatabaseContext(":memory:");
+  migrate(context.db, {
+    migrationsFolder: path.resolve("src", "db", "migrations"),
+  });
+  context.db
+    .insert(projects)
+    .values([
+      { id: "project-1", name: "Projekt" },
+      { id: "project-2", name: "Fremdprojekt" },
+    ])
+    .run();
+  new DistributionBoardFixtureRepository(
+    context.db
+  ).createWithCircuitListAndDefaultSections("project-1", "UV-01");
+  new DistributionBoardFixtureRepository(
+    context.db
+  ).createWithCircuitListAndDefaultSections("project-2", "UV-02");
+  return context;
+}
+
+function getProjectList(context: DatabaseContext, projectId: string) {
+  const list = context.db
+    .select()
+    .from(circuitLists)
+    .where(eq(circuitLists.projectId, projectId))
+    .get();
+  assert.ok(list);
+  return list;
+}
+
+function groupSnapshot(circuitListId: string): CircuitGroupSnapshot {
+  return {
+    id: "group-lighting-2",
+    circuitListId,
+    key: "lighting_2",
+    displayName: "Beleuchtung 2",
+    prefix: "-1F2.",
+    sortOrder: 40,
+    category: "lighting",
+    groupNumber: 2,
+  };
+}
+
+describe("circuit-group structure project command", () => {
+  it("inserts, renames and restores a group through persistent history", () => {
+    const context = createTestDatabase();
+    try {
+      const expected = groupSnapshot(
+        getProjectList(context, "project-1").id
+      );
+      const target = {
+        ...expected,
+        displayName: "Beleuchtung Besprechungsräume",
+      };
+      const repository =
+        new CircuitGroupStructureProjectCommandRepository(context.db);
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createCircuitGroupInsertProjectCommand(expected),
+      });
+      const updated = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "user",
+        command: createCircuitGroupUpdateProjectCommand(
+          expected,
+          target
+        ),
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, expected.id))
+          .get()?.displayName,
+        target.displayName
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: updated.inverse,
+      });
+      assert.deepEqual(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, expected.id))
+          .get(),
+        expected
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("deletes only an exact empty group and restores the same UUID", () => {
+    const context = createTestDatabase();
+    try {
+      const snapshot = groupSnapshot(
+        getProjectList(context, "project-1").id
+      );
+      const repository =
+        new CircuitGroupStructureProjectCommandRepository(context.db);
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createCircuitGroupInsertProjectCommand(snapshot),
+      });
+      const deleted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "user",
+        command: createCircuitGroupDeleteProjectCommand(snapshot),
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, snapshot.id))
+          .get(),
+        undefined
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 2,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: deleted.inverse,
+      });
+      assert.deepEqual(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, snapshot.id))
+          .get(),
+        snapshot
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects foreign lists, invalid prefixes, stale updates and populated deletes", () => {
+    const context = createTestDatabase();
+    try {
+      const snapshot = groupSnapshot(
+        getProjectList(context, "project-1").id
+      );
+      const repository =
+        new CircuitGroupStructureProjectCommandRepository(context.db);
+      assert.throws(
+        () =>
+          createCircuitGroupInsertProjectCommand({
+            ...snapshot,
+            prefix: "-1F9.",
+          }),
+        /prefix does not match/
+      );
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-2",
+            expectedRevision: 0,
+            source: "user",
+            command: createCircuitGroupInsertProjectCommand(snapshot),
+          }),
+        /does not belong/
+      );
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createCircuitGroupInsertProjectCommand(snapshot),
+      });
+      context.db
+        .insert(circuits)
+        .values({
+          id: "group-circuit",
+          circuitListId: snapshot.circuitListId,
+          sectionId: snapshot.id,
+          equipmentIdentifier: "-1F2.1",
+          displayName: "Beleuchtung",
+          sortOrder: 10,
+        })
+        .run();
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "user",
+            command: createCircuitGroupDeleteProjectCommand(snapshot),
+          }),
+        /Only empty circuit groups/
+      );
+      context.db
+        .update(circuitSections)
+        .set({ displayName: "Direkt geändert" })
+        .where(eq(circuitSections.id, snapshot.id))
+        .run();
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 1,
+            source: "user",
+            command: createCircuitGroupUpdateProjectCommand(snapshot, {
+              ...snapshot,
+              displayName: "Ziel",
+            }),
+          }),
+        /changed before update/
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        1
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back group insertion when history persistence fails", () => {
+    const context = createTestDatabase();
+    try {
+      const snapshot = groupSnapshot(
+        getProjectList(context, "project-1").id
+      );
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_group_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced group history failure');
+        END;
+      `);
+      assert.throws(
+        () =>
+          new CircuitGroupStructureProjectCommandRepository(
+            context.db
+          ).execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createCircuitGroupInsertProjectCommand(snapshot),
+          }),
+        /forced group history failure/
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, snapshot.id))
+          .get(),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("reorders every group atomically without changing group identity", () => {
+    const context = createTestDatabase();
+    try {
+      const circuitListId = getProjectList(context, "project-1").id;
+      const groups = context.db
+        .select()
+        .from(circuitSections)
+        .where(eq(circuitSections.circuitListId, circuitListId))
+        .all();
+      const expectedPrefixes = new Map(
+        groups.map((group) => [group.id, group.prefix])
+      );
+      const assignments = groups.map((group, index) => ({
+        groupId: group.id,
+        expectedSortOrder: group.sortOrder,
+        targetSortOrder: (groups.length - index) * 10,
+      }));
+      const repository =
+        new CircuitGroupStructureProjectCommandRepository(context.db);
+      const reordered = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command: createCircuitGroupReorderProjectCommand(
+          circuitListId,
+          assignments
+        ),
+      });
+      for (const assignment of assignments) {
+        const group = context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, assignment.groupId))
+          .get();
+        assert.equal(group?.sortOrder, assignment.targetSortOrder);
+        assert.equal(
+          group?.prefix,
+          expectedPrefixes.get(assignment.groupId)
+        );
+      }
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: reordered.inverse,
+      });
+      for (const assignment of assignments) {
+        assert.equal(
+          context.db
+            .select()
+            .from(circuitSections)
+            .where(eq(circuitSections.id, assignment.groupId))
+            .get()?.sortOrder,
+          assignment.expectedSortOrder
+        );
+      }
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects incomplete reorders and rolls back late failures", () => {
+    const context = createTestDatabase();
+    try {
+      const circuitListId = getProjectList(context, "project-1").id;
+      const groups = context.db
+        .select()
+        .from(circuitSections)
+        .where(eq(circuitSections.circuitListId, circuitListId))
+        .all();
+      const assignments = groups.map((group, index) => ({
+        groupId: group.id,
+        expectedSortOrder: group.sortOrder,
+        targetSortOrder: (groups.length - index) * 10,
+      }));
+      const repository =
+        new CircuitGroupStructureProjectCommandRepository(context.db);
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createCircuitGroupReorderProjectCommand(
+              circuitListId,
+              assignments.slice(1)
+            ),
+          }),
+        /include every unchanged group/
+      );
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_group_reorder_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced group reorder history failure');
+        END;
+      `);
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command: createCircuitGroupReorderProjectCommand(
+              circuitListId,
+              assignments
+            ),
+          }),
+        /forced group reorder history failure/
+      );
+      for (const assignment of assignments) {
+        assert.equal(
+          context.db
+            .select()
+            .from(circuitSections)
+            .where(eq(circuitSections.id, assignment.groupId))
+            .get()?.sortOrder,
+          assignment.expectedSortOrder
+        );
+      }
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+});

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

@@ -0,0 +1,269 @@
+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 { CircuitGroupSubtreeProjectCommandRepository } from "../src/db/repositories/circuit-group-subtree-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 { circuitLists } from "../src/db/schema/circuit-lists.js";
+import { circuitProtectionDevices } from "../src/db/schema/circuit-protection-devices.js";
+import { circuitSections } from "../src/db/schema/circuit-sections.js";
+import { circuits } from "../src/db/schema/circuits.js";
+import { distributionBoardComponentProtectionDevices } from "../src/db/schema/distribution-board-component-protection-devices.js";
+import { distributionBoardComponents } from "../src/db/schema/distribution-board-components.js";
+import { projectRevisions } from "../src/db/schema/project-revisions.js";
+import { projects } from "../src/db/schema/projects.js";
+import { createCircuitGroupDeleteSubtreeProjectCommand } from "../src/domain/models/circuit-group-subtree-project-command.model.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 group = context.db
+    .select()
+    .from(circuitSections)
+    .where(eq(circuitSections.category, "lighting"))
+    .get()!;
+  context.db
+    .insert(distributionBoardComponents)
+    .values({
+      id: "subtree-rcd",
+      circuitListId: list.id,
+      sectionId: group.id,
+      equipmentIdentifier: "-1Q1.0",
+      name: "Gruppen-FI",
+      role: "group_residual_current_protection",
+      placement: "group",
+      sortOrder: 10,
+    })
+    .run();
+  context.db
+    .insert(distributionBoardComponentProtectionDevices)
+    .values({
+      componentId: "subtree-rcd",
+      type: "FI",
+      ratedCurrentA: 40,
+      rcdType: "A",
+      ratedResidualCurrentMa: 30,
+    })
+    .run();
+  context.db
+    .insert(circuits)
+    .values({
+      id: "subtree-circuit",
+      circuitListId: list.id,
+      sectionId: group.id,
+      equipmentIdentifier: "-1F1.1",
+      displayName: "Beleuchtung",
+      sortOrder: 10,
+      voltage: 230,
+      isReserve: 0,
+    })
+    .run();
+  context.db
+    .insert(circuitProtectionDevices)
+    .values({
+      circuitId: "subtree-circuit",
+      type: "LS",
+      ratedCurrentA: 10,
+      tripCharacteristic: "B",
+    })
+    .run();
+  context.db
+    .insert(circuitDeviceRows)
+    .values({
+      id: "subtree-row",
+      circuitId: "subtree-circuit",
+      linkedProjectDeviceId: null,
+      legacyConsumerId: null,
+      sortOrder: 10,
+      name: "Leuchte",
+      displayName: "Leuchte",
+      phaseType: "single_phase",
+      connectionKind: null,
+      costGroup: null,
+      category: null,
+      level: null,
+      roomId: null,
+      roomNumberSnapshot: null,
+      roomNameSnapshot: null,
+      quantity: 2,
+      powerPerUnit: 0.03,
+      simultaneityFactor: 1,
+      cosPhi: 0.95,
+      remark: null,
+      overriddenFields: "[\"displayName\"]",
+    })
+    .run();
+  return context;
+}
+
+describe("circuit-group subtree project command", () => {
+  it("deletes and restores the exact populated subtree through undo/redo", () => {
+    const context = createTestDatabase();
+    try {
+      const repository =
+        new CircuitGroupSubtreeProjectCommandRepository(context.db);
+      const groupId = context.db
+        .select()
+        .from(circuits)
+        .where(eq(circuits.id, "subtree-circuit"))
+        .get()!.sectionId;
+      const snapshot = repository.capture("project-1", groupId);
+      const command =
+        createCircuitGroupDeleteSubtreeProjectCommand(snapshot);
+      const deleted = repository.execute({
+        projectId: "project-1",
+        expectedRevision: 0,
+        source: "user",
+        command,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, groupId))
+          .get(),
+        undefined
+      );
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitDeviceRows)
+          .where(eq(circuitDeviceRows.id, "subtree-row"))
+          .get(),
+        undefined
+      );
+
+      repository.execute({
+        projectId: "project-1",
+        expectedRevision: 1,
+        source: "undo",
+        historyTargetChangeSetId: new ProjectHistoryRepository(
+          context.db
+        ).getNextCommand("project-1", "undo")?.changeSetId,
+        command: deleted.inverse,
+      });
+      assert.deepEqual(
+        repository.capture("project-1", groupId),
+        snapshot
+      );
+
+      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, "subtree-circuit"))
+          .get(),
+        undefined
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rejects a subtree changed after confirmation", () => {
+    const context = createTestDatabase();
+    try {
+      const repository =
+        new CircuitGroupSubtreeProjectCommandRepository(context.db);
+      const groupId = context.db
+        .select()
+        .from(circuits)
+        .where(eq(circuits.id, "subtree-circuit"))
+        .get()!.sectionId;
+      const snapshot = repository.capture("project-1", groupId);
+      context.db
+        .update(circuitDeviceRows)
+        .set({ displayName: "Geändert" })
+        .where(eq(circuitDeviceRows.id, "subtree-row"))
+        .run();
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command:
+              createCircuitGroupDeleteSubtreeProjectCommand(snapshot),
+          }),
+        /changed before deletion/
+      );
+      assert.ok(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, groupId))
+          .get()
+      );
+      assert.equal(
+        context.db.select().from(projectRevisions).all().length,
+        0
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("rolls back a cascaded deletion when history persistence fails", () => {
+    const context = createTestDatabase();
+    try {
+      const repository =
+        new CircuitGroupSubtreeProjectCommandRepository(context.db);
+      const groupId = context.db
+        .select()
+        .from(circuits)
+        .where(eq(circuits.id, "subtree-circuit"))
+        .get()!.sectionId;
+      const snapshot = repository.capture("project-1", groupId);
+      context.sqlite.exec(`
+        CREATE TRIGGER fail_group_subtree_history
+        BEFORE INSERT ON project_history_stack_entries
+        BEGIN
+          SELECT RAISE(ABORT, 'forced group subtree history failure');
+        END;
+      `);
+      assert.throws(
+        () =>
+          repository.execute({
+            projectId: "project-1",
+            expectedRevision: 0,
+            source: "user",
+            command:
+              createCircuitGroupDeleteSubtreeProjectCommand(snapshot),
+          }),
+        /forced group subtree history failure/
+      );
+      assert.deepEqual(
+        repository.capture("project-1", groupId),
+        snapshot
+      );
+    } finally {
+      context.close();
+    }
+  });
+});

tests/circuit-group-subtree-snapshot.test.ts

@@ -0,0 +1,173 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  assertCircuitGroupSubtreeSnapshot,
+  summarizeCircuitGroupDeletion,
+  type CircuitGroupSubtreeSnapshot,
+} from "../src/domain/models/circuit-group-subtree-snapshot.model.js";
+
+function createSnapshot(): CircuitGroupSubtreeSnapshot {
+  return {
+    group: {
+      id: "group-1",
+      circuitListId: "list-1",
+      key: "lighting",
+      displayName: "Beleuchtung 1",
+      prefix: "-1F1.",
+      sortOrder: 10,
+      category: "lighting",
+      groupNumber: 1,
+    },
+    components: [
+      {
+        component: {
+          id: "fuse-1",
+          circuitListId: "list-1",
+          sectionId: "group-1",
+          equipmentIdentifier: "-1F1.0",
+          name: "Vorsicherung",
+          role: "group_upstream_protection",
+          placement: "group",
+          sortOrder: 10,
+        },
+        protectionDevice: {
+          componentId: "fuse-1",
+          type: "D02",
+          ratedCurrentA: 35,
+          fuseUtilizationCategory: "gG",
+          tripCharacteristic: null,
+          rcdType: null,
+          ratedResidualCurrentMa: null,
+        },
+      },
+      {
+        component: {
+          id: "rcd-1",
+          circuitListId: "list-1",
+          sectionId: "group-1",
+          equipmentIdentifier: "-1Q1.0",
+          name: "Gruppen-FI",
+          role: "group_residual_current_protection",
+          placement: "group",
+          sortOrder: 20,
+        },
+        protectionDevice: {
+          componentId: "rcd-1",
+          type: "FI",
+          ratedCurrentA: 40,
+          fuseUtilizationCategory: null,
+          tripCharacteristic: null,
+          rcdType: "A",
+          ratedResidualCurrentMa: 30,
+        },
+      },
+    ],
+    circuits: [
+      {
+        circuit: {
+          id: "circuit-1",
+          circuitListId: "list-1",
+          sectionId: "group-1",
+          equipmentIdentifier: "-1F1.1",
+          displayName: "Beleuchtung",
+          sortOrder: 10,
+          protectionType: null,
+          protectionRatedCurrent: null,
+          protectionCharacteristic: null,
+          cableType: null,
+          cableCrossSection: null,
+          cableLength: null,
+          rcdAssignment: null,
+          terminalDesignation: null,
+          voltage: 230,
+          controlRequirement: null,
+          status: null,
+          isReserve: false,
+          remark: null,
+          deviceRows: [
+            {
+              id: "row-1",
+              circuitId: "circuit-1",
+              linkedProjectDeviceId: "device-1",
+              legacyConsumerId: null,
+              sortOrder: 10,
+              name: "Leuchte",
+              displayName: "Leuchte Flur",
+              phaseType: "single_phase",
+              connectionKind: null,
+              costGroup: "440",
+              category: "Licht",
+              level: "EG",
+              roomId: "room-1",
+              roomNumberSnapshot: "001",
+              roomNameSnapshot: "Flur",
+              quantity: 2,
+              powerPerUnit: 0.03,
+              simultaneityFactor: 1,
+              cosPhi: 0.95,
+              remark: null,
+              overriddenFields: "[\"displayName\"]",
+            },
+          ],
+        },
+        protectionDevice: {
+          circuitId: "circuit-1",
+          type: "LS",
+          ratedCurrentA: 10,
+          fuseUtilizationCategory: null,
+          tripCharacteristic: "B",
+          rcdType: null,
+          ratedResidualCurrentMa: null,
+        },
+      },
+    ],
+  };
+}
+
+describe("circuit-group subtree snapshot", () => {
+  it("validates complete relations and derives the deletion warning summary", () => {
+    const snapshot = createSnapshot();
+    assert.doesNotThrow(() =>
+      assertCircuitGroupSubtreeSnapshot(snapshot)
+    );
+    assert.deepEqual(summarizeCircuitGroupDeletion(snapshot), {
+      hasUpstreamProtection: true,
+      hasResidualCurrentProtection: true,
+      circuitCount: 1,
+      deviceRowCount: 1,
+    });
+  });
+
+  it("rejects foreign children, duplicate BMKs and invalid protection", () => {
+    const foreign = createSnapshot();
+    foreign.circuits[0].circuit.sectionId = "group-2";
+    assert.throws(
+      () => assertCircuitGroupSubtreeSnapshot(foreign),
+      /ownership/
+    );
+
+    const duplicate = createSnapshot();
+    duplicate.circuits[0].circuit.equipmentIdentifier = "-1F1.0";
+    assert.throws(
+      () => assertCircuitGroupSubtreeSnapshot(duplicate),
+      /duplicates/
+    );
+
+    const invalidProtection = createSnapshot();
+    invalidProtection.circuits[0].protectionDevice = {
+      ...invalidProtection.circuits[0].protectionDevice!,
+      type: "AFDD",
+      ratedResidualCurrentMa: 30,
+    };
+    assert.throws(
+      () => assertCircuitGroupSubtreeSnapshot(invalidProtection),
+      /configuration/
+    );
+  });
+
+  it("preserves device link and override metadata", () => {
+    const row = createSnapshot().circuits[0].circuit.deviceRows[0];
+    assert.equal(row.linkedProjectDeviceId, "device-1");
+    assert.equal(row.overriddenFields, "[\"displayName\"]");
+  });
+});

tests/circuit-structure-projection.test.ts

@@ -0,0 +1,144 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { buildCircuitStructureProjection } from "../src/frontend/utils/circuit-structure-projection.js";
+import type {
+  CircuitTreeCircuitDto,
+  CircuitTreeComponentDto,
+  CircuitTreeSectionDto,
+} from "../src/frontend/types.js";
+
+function component(
+  id: string,
+  placement: CircuitTreeComponentDto["placement"],
+  sortOrder: number,
+  sectionId?: string
+): CircuitTreeComponentDto {
+  return {
+    id,
+    circuitListId: "list-1",
+    sectionId,
+    equipmentIdentifier: `-${id}`,
+    name: id,
+    role:
+      placement === "header"
+        ? "main_switch"
+        : placement === "footer"
+          ? "auxiliary"
+          : "group_residual_current_protection",
+    placement,
+    sortOrder,
+  };
+}
+
+function circuit(
+  id: string,
+  sectionId: string
+): CircuitTreeCircuitDto {
+  return {
+    id,
+    circuitListId: "list-1",
+    sectionId,
+    equipmentIdentifier: `-${id}`,
+    sortOrder: 10,
+    isReserve: true,
+    circuitTotalPower: 0,
+    deviceRows: [],
+  };
+}
+
+function section(
+  id: string,
+  sortOrder: number
+): CircuitTreeSectionDto {
+  return {
+    id,
+    key: id,
+    displayName: id,
+    prefix: "-1F1.",
+    sortOrder,
+    category: "lighting",
+    groupNumber: sortOrder / 10,
+    sectionTotalPower: 0,
+    components: [
+      component(`${id}-rcd-late`, "group", 20, id),
+      component(`${id}-rcd-first`, "group", 10, id),
+    ],
+    circuits: [circuit(`${id}-circuit`, id)],
+  };
+}
+
+describe("circuit structure projection", () => {
+  it("projects fixed header, complete groups and auxiliary footer in stable order", () => {
+    const rows = buildCircuitStructureProjection({
+      headerComponents: [
+        component("surge", "header", 20),
+        component("main", "header", 10),
+      ],
+      sections: [section("group-2", 20), section("group-1", 10)],
+      footerComponents: [
+        component("actor-2", "footer", 20),
+        component("actor-1", "footer", 10),
+      ],
+    });
+    assert.deepEqual(
+      rows.map((row) => row.rowKey),
+      [
+        "header-component:main",
+        "header-component:surge",
+        "group:group-1",
+        "group-component:group-1-rcd-first",
+        "group-component:group-1-rcd-late",
+        "circuit-block:group-1-circuit",
+        "group-placeholder:group-1",
+        "group:group-2",
+        "group-component:group-2-rcd-first",
+        "group-component:group-2-rcd-late",
+        "circuit-block:group-2-circuit",
+        "group-placeholder:group-2",
+        "footer-component:actor-1",
+        "footer-component:actor-2",
+      ]
+    );
+  });
+
+  it("keeps structural rows around an empty group", () => {
+    const empty = section("group-empty", 10);
+    empty.components = [];
+    empty.circuits = [];
+    assert.deepEqual(
+      buildCircuitStructureProjection({
+        headerComponents: [],
+        sections: [empty],
+        footerComponents: [],
+      }).map((row) => row.rowType),
+      ["groupHeader", "groupPlaceholder"]
+    );
+  });
+
+  it("keeps circuit device rows inside their circuit block", () => {
+    const grouped = section("group-1", 10);
+    grouped.circuits[0].deviceRows = [
+      {
+        id: "device-1",
+        sortOrder: 10,
+        name: "Leuchte",
+        displayName: "Leuchte",
+        quantity: 1,
+        powerPerUnit: 0.1,
+        simultaneityFactor: 1,
+        rowTotalPower: 0.1,
+      },
+    ];
+    const block = buildCircuitStructureProjection({
+      headerComponents: [],
+      sections: [grouped],
+      footerComponents: [],
+    }).find((row) => row.rowType === "circuitBlock");
+    assert.equal(
+      block?.rowType === "circuitBlock"
+        ? block.circuit.deviceRows[0].id
+        : null,
+      "device-1"
+    );
+  });
+});

tests/circuit-tree.controller.test.ts

@@ -1,6 +1,19 @@
 import assert from "node:assert/strict";
 import { describe, it } from "node:test";
-import { isMissingCircuitTreeSchemaError } from "../src/server/controllers/circuit-tree.controller.js";
+import {
+  getCircuitTree,
+  isMissingCircuitTreeSchemaError,
+} from "../src/server/controllers/circuit-tree.controller.js";
+import {
+  circuitDeviceRowRepository,
+  circuitListRepository,
+  circuitProtectionDeviceRepository,
+  circuitRepository,
+  circuitSectionRepository,
+  distributionBoardComponentRepository,
+  distributionBoardRepository,
+  projectRepository,
+} from "../src/server/composition/application-repositories.js";
 
 describe("circuit tree controller", () => {
   it("detects missing circuit-first schema errors", () => {
@@ -13,7 +26,192 @@ describe("circuit tree controller", () => {
       isMissingCircuitTreeSchemaError(new Error("SqliteError: no such table: circuit_device_rows")),
       true
     );
+    assert.equal(
+      isMissingCircuitTreeSchemaError(
+        new Error("SqliteError: no such table: distribution_board_components")
+      ),
+      true
+    );
     assert.equal(isMissingCircuitTreeSchemaError(new Error("Some other error")), false);
   });
+
+  it("returns header, grouped and footer components with both protection layers", async () => {
+    const originals = {
+      findList: circuitListRepository.findById,
+      findProject: projectRepository.findById,
+      findBoard: distributionBoardRepository.findById,
+      listSections: circuitSectionRepository.listByCircuitList,
+      listCircuits: circuitRepository.listByCircuitList,
+      listRows: circuitDeviceRowRepository.listByCircuitList,
+      listComponents:
+        distributionBoardComponentRepository.listByCircuitList,
+      listComponentProtection:
+        distributionBoardComponentRepository.listProtectionByComponentIds,
+      listCircuitProtection:
+        circuitProtectionDeviceRepository.listByCircuitIds,
+    };
+    circuitListRepository.findById = async () =>
+      ({
+        id: "list-1",
+        projectId: "project-1",
+        distributionBoardId: "board-1",
+        name: "UV-01",
+      }) as never;
+    projectRepository.findById = async () =>
+      ({
+        id: "project-1",
+        name: "Projekt",
+        currentRevision: 4,
+        singlePhaseVoltageV: 230,
+        threePhaseVoltageV: 400,
+      }) as never;
+    distributionBoardRepository.findById = async () =>
+      ({ id: "board-1", simultaneityFactor: 0.8 }) as never;
+    circuitSectionRepository.listByCircuitList = async () =>
+      [
+        {
+          id: "group-1",
+          circuitListId: "list-1",
+          key: "lighting",
+          displayName: "Beleuchtung 1",
+          prefix: "-1F1.",
+          sortOrder: 10,
+          category: "lighting",
+          groupNumber: 1,
+        },
+      ] as never;
+    circuitRepository.listByCircuitList = async () =>
+      [
+        {
+          id: "circuit-1",
+          circuitListId: "list-1",
+          sectionId: "group-1",
+          equipmentIdentifier: "-1F1.1",
+          displayName: "Licht",
+          sortOrder: 10,
+          isReserve: 0,
+        },
+      ] as never;
+    circuitDeviceRowRepository.listByCircuitList = async () => [];
+    distributionBoardComponentRepository.listByCircuitList =
+      async () =>
+        [
+          {
+            id: "main",
+            circuitListId: "list-1",
+            sectionId: null,
+            equipmentIdentifier: "-Q0",
+            name: "Hauptschalter",
+            role: "main_switch",
+            placement: "header",
+            sortOrder: 10,
+          },
+          {
+            id: "rcd",
+            circuitListId: "list-1",
+            sectionId: "group-1",
+            equipmentIdentifier: "-1Q1.0",
+            name: "Gruppen-FI",
+            role: "group_residual_current_protection",
+            placement: "group",
+            sortOrder: 10,
+          },
+          {
+            id: "actor",
+            circuitListId: "list-1",
+            sectionId: null,
+            equipmentIdentifier: "-K1",
+            name: "KNX Aktor",
+            role: "auxiliary",
+            placement: "footer",
+            sortOrder: 10,
+          },
+        ] as never;
+    distributionBoardComponentRepository.listProtectionByComponentIds =
+      async () =>
+        [
+          {
+            componentId: "rcd",
+            type: "FI",
+            ratedCurrentA: 40,
+            fuseUtilizationCategory: null,
+            tripCharacteristic: null,
+            rcdType: "A",
+            ratedResidualCurrentMa: 30,
+          },
+        ] as never;
+    circuitProtectionDeviceRepository.listByCircuitIds = async () =>
+      [
+        {
+          circuitId: "circuit-1",
+          type: "LS",
+          ratedCurrentA: 10,
+          fuseUtilizationCategory: null,
+          tripCharacteristic: "B",
+          rcdType: null,
+          ratedResidualCurrentMa: null,
+        },
+      ] as never;
+
+    let responseBody: unknown;
+    const response = {
+      status() {
+        return this;
+      },
+      json(value: unknown) {
+        responseBody = value;
+        return this;
+      },
+    };
+    try {
+      await getCircuitTree(
+        { params: { projectId: "project-1", circuitListId: "list-1" } } as never,
+        response as never
+      );
+    } finally {
+      circuitListRepository.findById = originals.findList;
+      projectRepository.findById = originals.findProject;
+      distributionBoardRepository.findById = originals.findBoard;
+      circuitSectionRepository.listByCircuitList =
+        originals.listSections;
+      circuitRepository.listByCircuitList = originals.listCircuits;
+      circuitDeviceRowRepository.listByCircuitList = originals.listRows;
+      distributionBoardComponentRepository.listByCircuitList =
+        originals.listComponents;
+      distributionBoardComponentRepository.listProtectionByComponentIds =
+        originals.listComponentProtection;
+      circuitProtectionDeviceRepository.listByCircuitIds =
+        originals.listCircuitProtection;
+    }
+
+    const tree = responseBody as {
+      headerComponents: Array<{ equipmentIdentifier: string }>;
+      footerComponents: Array<{ equipmentIdentifier: string }>;
+      sections: Array<{
+        category: string;
+        groupNumber: number;
+        components: Array<{
+          protectionDevice: { ratedResidualCurrentMa: number };
+        }>;
+        circuits: Array<{
+          protectionDevice: { tripCharacteristic: string };
+        }>;
+      }>;
+    };
+    assert.equal(tree.headerComponents[0].equipmentIdentifier, "-Q0");
+    assert.equal(tree.footerComponents[0].equipmentIdentifier, "-K1");
+    assert.equal(tree.sections[0].category, "lighting");
+    assert.equal(tree.sections[0].groupNumber, 1);
+    assert.equal(
+      tree.sections[0].components[0].protectionDevice
+        .ratedResidualCurrentMa,
+      30
+    );
+    assert.equal(
+      tree.sections[0].circuits[0].protectionDevice
+        .tripCharacteristic,
+      "B"
+    );
+  });
 });
 

tests/project-command.service.test.ts

@@ -14,6 +14,10 @@ import { CircuitProjectCommandRepository } from "../src/db/repositories/circuit-
 import { CircuitSectionReorderProjectCommandRepository } from "../src/db/repositories/circuit-section-reorder-project-command.repository.js";
 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 { CircuitGroupMoveProjectCommandRepository } from "../src/db/repositories/circuit-group-move-project-command.repository.js";
+import { CircuitGroupSubtreeProjectCommandRepository } from "../src/db/repositories/circuit-group-subtree-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";
@@ -47,6 +51,16 @@ import { createCircuitSectionReorderProjectCommand } from "../src/domain/models/
 import { createCircuitSectionsReorderProjectCommand } from "../src/domain/models/circuit-sections-reorder-project-command.model.js";
 import { createCircuitSectionRenumberProjectCommand } from "../src/domain/models/circuit-section-renumber-project-command.model.js";
 import { createCircuitInsertProjectCommand } from "../src/domain/models/circuit-structure-project-command.model.js";
+import {
+  createCircuitGroupInsertProjectCommand,
+  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 { createCircuitGroupMoveProjectCommand } from "../src/domain/models/circuit-group-move-project-command.model.js";
+import { createCircuitGroupMovePlan } from "../src/domain/services/circuit-group-move-planning.js";
+import { createCircuitGroupDeleteSubtreeProjectCommand } from "../src/domain/models/circuit-group-subtree-project-command.model.js";
 import {
   createDistributionBoardInsertProjectCommand,
   createDistributionBoardStructureSnapshot,
@@ -131,6 +145,10 @@ function createService(context: DatabaseContext) {
     new DistributionBoardComponentStructureProjectCommandRepository(
       context.db
     ),
+    new CircuitGroupStructureProjectCommandRepository(context.db),
+    new CircuitGroupRenumberProjectCommandRepository(context.db),
+    new CircuitGroupMoveProjectCommandRepository(context.db),
+    new CircuitGroupSubtreeProjectCommandRepository(context.db),
     new ProjectHistoryRepository(context.db)
   );
 }
@@ -1207,6 +1225,272 @@ describe("project command service", () => {
     }
   });
 
+  it("dispatches circuit-group structure commands", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const circuitListId = context.db
+        .select()
+        .from(circuitSections)
+        .get()!.circuitListId;
+      const expected = {
+        id: "group-service",
+        circuitListId,
+        key: "lighting_2",
+        displayName: "Beleuchtung 2",
+        prefix: "-1F2.",
+        sortOrder: 40,
+        category: "lighting" as const,
+        groupNumber: 2,
+      };
+      const target = {
+        ...expected,
+        displayName: "Beleuchtung Nebenräume",
+      };
+      service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command: createCircuitGroupInsertProjectCommand(expected),
+      });
+      const updated = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 1,
+        command: createCircuitGroupUpdateProjectCommand(
+          expected,
+          target
+        ),
+      });
+      assert.equal(updated.history.currentRevision, 2);
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, expected.id))
+          .get()?.displayName,
+        target.displayName
+      );
+
+      createService(context).undo({
+        projectId: "project-1",
+        expectedRevision: 2,
+      });
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, expected.id))
+          .get()?.displayName,
+        expected.displayName
+      );
+
+      const groups = context.db
+        .select()
+        .from(circuitSections)
+        .where(eq(circuitSections.circuitListId, circuitListId))
+        .all();
+      const reorderAssignments = groups.map((group, index) => ({
+        groupId: group.id,
+        expectedSortOrder: group.sortOrder,
+        targetSortOrder: (groups.length - index) * 10,
+      }));
+      const reordered = createService(context).executeUser({
+        projectId: "project-1",
+        expectedRevision: 3,
+        command: createCircuitGroupReorderProjectCommand(
+          circuitListId,
+          reorderAssignments
+        ),
+      });
+      assert.equal(reordered.history.currentRevision, 4);
+    } finally {
+      context.close();
+    }
+  });
+
+  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 same-category circuit group moves", () => {
+    const context = createTestDatabase();
+    try {
+      const service = createService(context);
+      const source = context.db
+        .select()
+        .from(circuitSections)
+        .where(eq(circuitSections.category, "three_phase"))
+        .get()!;
+      const target = {
+        id: "group-move-service-target",
+        circuitListId: source.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(target),
+      });
+      context.db
+        .insert(circuits)
+        .values({
+          id: "circuit-group-move-service",
+          circuitListId: source.circuitListId,
+          sectionId: source.id,
+          equipmentIdentifier: "-3F1.1",
+          displayName: "Drehstrom",
+          sortOrder: 10,
+        })
+        .run();
+      const result = service.executeUser({
+        projectId: "project-1",
+        expectedRevision: 1,
+        command: createCircuitGroupMoveProjectCommand(
+          createCircuitGroupMovePlan({
+            circuit: {
+              id: "circuit-group-move-service",
+              circuitListId: source.circuitListId,
+              sectionId: source.id,
+              equipmentIdentifier: "-3F1.1",
+              sortOrder: 10,
+            },
+            sourceGroup: {
+              id: source.id,
+              category: "three_phase",
+              groupNumber: 1,
+              prefix: "-3F1.",
+            },
+            targetGroup: target,
+            targetCircuitEquipmentIdentifiers: [],
+            targetSortOrder: 20,
+          })
+        ),
+      });
+      assert.equal(result.history.currentRevision, 2);
+      assert.equal(
+        context.db
+          .select()
+          .from(circuits)
+          .where(eq(circuits.id, "circuit-group-move-service"))
+          .get()?.equipmentIdentifier,
+        "-3F2.1"
+      );
+    } finally {
+      context.close();
+    }
+  });
+
+  it("dispatches populated circuit-group deletion and restoration", () => {
+    const context = createTestDatabase();
+    try {
+      const repository =
+        new CircuitGroupSubtreeProjectCommandRepository(context.db);
+      const groupId = context.db
+        .select()
+        .from(circuits)
+        .where(eq(circuits.id, "circuit-1"))
+        .get()!.sectionId;
+      const snapshot = repository.capture("project-1", groupId);
+      const deleted = createService(context).executeUser({
+        projectId: "project-1",
+        expectedRevision: 0,
+        command:
+          createCircuitGroupDeleteSubtreeProjectCommand(snapshot),
+      });
+      assert.equal(deleted.history.currentRevision, 1);
+      assert.equal(
+        context.db
+          .select()
+          .from(circuitSections)
+          .where(eq(circuitSections.id, groupId))
+          .get(),
+        undefined
+      );
+
+      const restored = createService(context).undo({
+        projectId: "project-1",
+        expectedRevision: 1,
+      });
+      assert.equal(restored.history.currentRevision, 2);
+      assert.deepEqual(
+        repository.capture("project-1", groupId),
+        snapshot
+      );
+    } 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

@@ -14,6 +14,10 @@ import { CircuitProjectCommandRepository } from "../src/db/repositories/circuit-
 import { CircuitSectionRenumberProjectCommandRepository } from "../src/db/repositories/circuit-section-renumber-project-command.repository.js";
 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 { CircuitGroupMoveProjectCommandRepository } from "../src/db/repositories/circuit-group-move-project-command.repository.js";
+import { CircuitGroupSubtreeProjectCommandRepository } from "../src/db/repositories/circuit-group-subtree-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";
@@ -195,6 +199,10 @@ function createService(context: DatabaseContext) {
     new DistributionBoardComponentStructureProjectCommandRepository(
       context.db
     ),
+    new CircuitGroupStructureProjectCommandRepository(context.db),
+    new CircuitGroupRenumberProjectCommandRepository(context.db),
+    new CircuitGroupMoveProjectCommandRepository(context.db),
+    new CircuitGroupSubtreeProjectCommandRepository(context.db),
     new ProjectHistoryRepository(context.db)
   );
 }

tests/project-version-history.test.ts

@@ -139,6 +139,58 @@ describe("project version history presentation", () => {
       ),
       "Verteilergerät bearbeitet"
     );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(8, { commandType: "circuit-group.insert" })
+      ),
+      "Stromkreisgruppe angelegt"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(9, { commandType: "circuit-group.delete" })
+      ),
+      "Stromkreisgruppe entfernt"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(10, { commandType: "circuit-group.update" })
+      ),
+      "Stromkreisgruppe bearbeitet"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(11, { commandType: "circuit-group.reorder" })
+      ),
+      "Stromkreisgruppen sortiert"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(12, { commandType: "circuit-group.renumber" })
+      ),
+      "Stromkreisgruppen neu nummeriert"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(13, { commandType: "circuit.move-group" })
+      ),
+      "Stromkreis in andere Gruppe verschoben"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(14, {
+          commandType: "circuit-group.delete-subtree",
+        })
+      ),
+      "Stromkreisgruppe vollständig entfernt"
+    );
+    assert.equal(
+      getProjectRevisionDescription(
+        revision(15, {
+          commandType: "circuit-group.restore-subtree",
+        })
+      ),
+      "Stromkreisgruppe vollständig wiederhergestellt"
+    );
     assert.equal(getProjectSnapshotKindLabel("named"), "Benannt");
     assert.equal(
       getProjectSnapshotKindLabel("automatic"),