Restore editor history after reload

AGENTS.md

@@ -220,19 +220,18 @@ After saving, the row becomes linked to the new project device.
 
 ## Undo / Redo
 
-The editor's visible undo/redo stack remains session-local and is not yet
+The editor reads undo/redo eligibility from the project-wide server history on
-reconstructed after reload. All currently supported Circuit and
+initial load and after every tree reload. Undo/redo therefore remains available
-CircuitDeviceRow writes execute persistent project commands; their toolbar
+after a page refresh or application restart. All currently supported Circuit
-undo/redo actions use the project-wide history endpoints. Applying a sorted
+and CircuitDeviceRow writes execute persistent project commands. Applying a
-view across multiple sections is one atomic `circuit.reorder-sections` command
+sorted view across multiple sections is one atomic `circuit.reorder-sections`
-and one undo step. Explicit renumbering uses the collision-safe
+command and one undo step. Explicit renumbering uses the collision-safe
 `circuit.renumber-section` command and is never triggered implicitly.
 Insertions and generated move targets use client-generated stable UUIDs, and
 undo restores the same ids from complete server snapshots. The tree response
 supplies the optimistic `currentRevision`; obsolete direct field PATCH,
 structure POST, move, reorder, renumber, identifier-restore, Circuit and
 CircuitDeviceRow DELETE routes are removed.
-Reloading the page does not yet reconstruct the visible editor stack.
 CircuitDeviceRow moves between existing circuits and moves that create one new
 placeholder target circuit are persisted. The latter stores the complete empty
 target snapshot so undo can restore the rows and remove only the unchanged
@@ -299,7 +298,6 @@ Users must be able to override sizing suggestions.
 
 ## Current Deferred Work
 
-- complete persistent project command coverage and the undo/redo UI cutover
 - named logical snapshots and restore
 - Revit/CSV/IFCGUID round-trip
 - full electrical sizing

docs/circuit-list-editor-interactions.md

@@ -122,14 +122,15 @@ Cross-section device moves show confirmation-required feedback before drop. The
 
 ## Undo/Redo
 
-Undo/redo wraps editor operations as command objects and reloads the tree after
+Editor operations execute persistent project commands and reload the tree after
-each command. Existing Circuit and device-row cell edits plus standalone
+each command. On initial load and every reload, the editor reads undo/redo
-insert/delete actions execute persistent project commands; their toolbar
+eligibility from the project-wide server history and verifies that tree and
-undo/redo calls the project-wide server history. New entities receive stable
+history belong to the same project revision. Undo/redo therefore remains
-UUIDs before insertion, and deletion undo restores those same ids. Device-row
+available after a page refresh. New entities receive stable UUIDs before
-moves and circuit reorders also use persistent project commands. Applying a
+insertion, and deletion undo restores those same ids. Device-row moves and
-sorted view across multiple sections is atomic and occupies one history step.
+circuit reorders also use persistent project commands. Applying a sorted view
-Explicit renumbering uses a collision-safe persistent project command and one
+across multiple sections is atomic and occupies one history step. Explicit
+renumbering uses a collision-safe persistent project command and one
 project-history step.
 
 Covered operations include:
@@ -141,6 +142,5 @@ Covered operations include:
 - renumber and identifier update flows
 - apply sorted order
 
-Current limitations:
+The toolbar currently exposes availability through its Undo/Redo buttons. A
-
+browsable revision timeline and named restore points are separate future work.
-- the visible editor stack is still session-local and is empty after reload

docs/circuit-list-editor-known-limitations.md

@@ -2,11 +2,10 @@
 
 - All currently supported Circuit and CircuitDeviceRow editor writes use
   persistent project commands and project-wide toolbar undo/redo, including
-  moves, atomic multi-section reorders and explicit renumbering. The editor's
+  moves, atomic multi-section reorders and explicit renumbering. Undo/redo
-  visible stack is still session-local and empty after reload.
+  eligibility is restored from server history after a page reload.
-- Server-side project revisions and persistent undo/redo eligibility exist for
+- There is no browsable revision timeline yet; the editor currently exposes
-  the command types documented in `circuit-list-editor-api.md`; visible history
+  only the next eligible Undo/Redo actions.
-  reconstruction is not complete.
 - Named logical project snapshots and restore are not implemented yet.
 - No Revit/CSV/IFCGUID import and export workflow is implemented yet.
 - Persistence currently targets local SQLite; PostgreSQL is an architectural option, not an implemented runtime.

docs/current-architecture.md

@@ -62,9 +62,10 @@ liegt über einen Host-Mount außerhalb des Containers.
 6. Das Frontend lädt den Circuit-Tree neu und stellt Auswahl beziehungsweise
    Viewport soweit möglich wieder her.
 
-Der sichtbare React-Historiestapel ist während des schrittweisen Cutovers noch
+Der Editor besitzt keinen sitzungslokalen Undo-/Redo-Stapel mehr. Beim initialen
-sitzungslokal. Das Datenmodell besitzt
+Laden und nach jedem Tree-Reload liest er den persistenten History-Status und
-einen projektbezogenen Revisionszähler sowie getrennte Revision-/Change-Set-
+gleicht dessen Revision mit `currentRevision` des Trees ab. Das Datenmodell
+besitzt einen projektbezogenen Revisionszähler sowie getrennte Revision-/Change-Set-
 Tabellen. Ein getestetes Repository kann diese Historienmetadaten optimistisch
 und atomar fortschreiben. Vorwärts- und Rückwärtskommandos besitzen einen
 versionierten, JSON-sicheren Umschlag; Typ und Payload können dadurch nach
@@ -94,8 +95,9 @@ dazu `currentRevision`; Undo/Redo für diese Aktionen läuft über die projektwe
 Serverhistorie. Direkte Feld-PATCH-, Struktur-POST-, Move-, Circuit- und
 Gerätezeilen-DELETE-Endpunkte sind entfernt. Gerätezeilen-Moves,
 Stromkreis-Reorders und die explizite Neunummerierung im Grid verwenden die
-persistenten Kommandos. Der sichtbare Undo-/Redo-Stack wird nach einem Reload
+persistenten Kommandos. Die Toolbar leitet ihre Undo-/Redo-Verfügbarkeit direkt
-noch nicht aus der Serverhistorie rekonstruiert.
+aus den serverseitigen Stack-Tiefen ab, sodass ein Reload die Bedienbarkeit
+nicht unterbricht.
 `circuit-device-row.move` verschiebt oder sortiert eine oder mehrere Zeilen
 zwischen vorhandenen Stromkreisen derselben Liste. Erwartete und neue
 Stromkreis-/Sortierpositionen machen Forward und Inverse deterministisch;

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

@@ -60,7 +60,9 @@ Full event sourcing is not required. Current normalized tables remain the primar
 - After a page reload, the client requests the current revision and eligible history actions.
 - Commands include an expected project revision. A stale command is rejected instead of silently overwriting a newer project state.
 
-The current session-local frontend command stack is transitional. Editor modularization must separate command descriptions from React callbacks so commands can later be sent to and reconstructed by the server.
+The circuit-list editor uses the server state directly for operation
+eligibility. React callbacks only initiate forward commands and provide
+best-effort selection hints after the tree reload.
 
 ## Snapshot Storage
 
@@ -210,6 +212,9 @@ Completed foundation:
 - the editor's explicit renumber action uses this command; obsolete direct
   renumber and identifier-restore routes plus their transaction adapter are
   removed
+- the circuit-list editor loads project-wide undo/redo eligibility together
+  with the tree, retries revision mismatches and keeps Undo/Redo available after
+  page reloads without a session-local command stack
 - `project-device.sync-rows` records synchronization, disconnect and reconnect
   as one atomic multi-row operation; complete expected/target sync snapshots
   protect local values, links and override metadata against silent stale writes
@@ -219,11 +224,9 @@ Completed foundation:
   ids; delete undo restores links only from complete unchanged disconnected-row
   snapshots in the same transaction
 
-Remaining constraints before completing persistent history:
+Remaining constraints before completing project version history:
 
-- reconstruct the visible frontend history state after reload; Circuit and
+- add a browsable revision timeline plus named logical snapshots and restore
-  CircuitDeviceRow operations plus ProjectDevice operations already use
-  persistent commands and project-wide undo
 - extend project-scoped commands only when further project mutations are
   deliberately added to history; the generic versioned envelope is complete
 - do not model IFCGUID as an overloaded circuit equipment identifier

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

@@ -358,8 +358,8 @@ Tasks:
 - [x] add immutable append-only server-side change-set storage with versioned
   forward/inverse payloads
 - [x] add optimistic checks when appending a revision
-- route domain writes and history records through one shared transaction
+- [x] route supported domain writes and history records through one shared transaction
-- define concrete serializable domain command descriptions and executors
+- [x] define concrete serializable domain command descriptions and executors
   outside React
 - [x] persist undo/redo eligibility on the server
 - [x] expose public command, undo and redo endpoints for the first supported
@@ -435,8 +435,9 @@ Circuit/CircuitDeviceRow field/insert/delete actions, device-row moves and
 circuit reorders in the circuit-list editor are connected to this history
 boundary. Applying sorted order across multiple sections is one atomic command.
 Explicit renumbering is connected to the same persistent boundary. The
-editor's visible undo/redo stack remains session-local and is not reconstructed
+editor reads the persistent undo/redo stack depths on initial load and after
-after reload.
+every tree reload. Tree and history revisions are reconciled before the state
+is exposed, so the toolbar remains usable after a page refresh.
 
 Acceptance criteria:
 

package.json

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

src/frontend/components/circuit-tree-editor.tsx

@@ -36,9 +36,9 @@ import {
 import {
   buildCircuitSectionRenumberAssignments,
 } from "../utils/circuit-section-renumber-command";
+import { loadCircuitEditorSnapshot } from "../utils/circuit-editor-history";
 import type {
   CellKey,
-  CellKind,
   ColumnDef,
   RowType,
 } from "../utils/circuit-grid-model";
@@ -53,6 +53,7 @@ import {
   deleteCircuitDeviceRowCommand,
   getCircuitTree,
   getNextCircuitIdentifier,
+  getProjectHistory,
   insertCircuitCommand,
   insertCircuitDeviceRowCommand,
   listProjectDevices,
@@ -73,6 +74,7 @@ import type {
   CreateCircuitInputDto,
   ProjectCommandResultDto,
   ProjectDeviceDto,
+  ProjectHistoryStateDto,
 } from "../types";
 import type {
   CircuitDeviceRowSnapshot,
@@ -108,11 +110,6 @@ interface SelectionIntent {
 interface HistoryCommand {
   label: string;
   redo: () => Promise<SelectionIntent | null | void>;
-  undo: () => Promise<SelectionIntent | null | void>;
-  persistent?: {
-    undoIntent: () => SelectionIntent | null;
-    redoIntent: () => SelectionIntent | null;
-  };
 }
 
 type ProjectDeviceDropIntent =
@@ -214,10 +211,7 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
   const [draggingCircuitId, setDraggingCircuitId] = useState<string | null>(null);
   const [draggingCircuitIds, setDraggingCircuitIds] = useState<string[]>([]);
   const [circuitReorderIntent, setCircuitReorderIntent] = useState<CircuitReorderDropIntent | null>(null);
-  // The visible stack is session-local during the cutover. Circuit/device field
+  const [historyState, setHistoryState] = useState<ProjectHistoryStateDto | null>(null);
-  // commands already use the persistent project-wide server history.
-  const [undoStack, setUndoStack] = useState<HistoryCommand[]>([]);
-  const [redoStack, setRedoStack] = useState<HistoryCommand[]>([]);
   const [historyBusy, setHistoryBusy] = useState(false);
   const [sortState, setSortState] = useState<{ key: CellKey; direction: SortDirection } | null>(null);
   const [columnFilters, setColumnFilters] = useState<Partial<Record<CellKey, string[]>>>({});
@@ -255,8 +249,12 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     }
     setError(null);
     try {
-      const tree = await getCircuitTree(projectId, circuitListId);
+      const { tree, history } = await loadCircuitEditorSnapshot(
-      projectRevisionRef.current = tree.currentRevision;
+        () => getCircuitTree(projectId, circuitListId),
+        () => getProjectHistory(projectId)
+      );
+      projectRevisionRef.current = history.currentRevision;
+      setHistoryState(history);
       setData(tree);
     } catch (err) {
       setError(normalizeUiError(err));
@@ -279,17 +277,16 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     void loadTree({ showLoading: true });
   }, [projectId, circuitListId]);
 
-  // Loads project-device palette used for sidebar drag/drop and quick inserts.
-  useEffect(() => {
   async function loadProjectDeviceList() {
-      try {
     const list = await listProjectDevices(projectId);
     setProjectDevices(list);
-      } catch (err) {
+  }
+
+  // Loads project-device palette used for sidebar drag/drop and quick inserts.
+  useEffect(() => {
+    void loadProjectDeviceList().catch((err) => {
       setError(normalizeUiError(err));
-      }
+    });
-    }
-    void loadProjectDeviceList();
   }, [projectId]);
 
   useEffect(() => {
@@ -792,6 +789,7 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
 
   function applyProjectCommandResult(result: ProjectCommandResultDto) {
     projectRevisionRef.current = result.history.currentRevision;
+    setHistoryState(result.history);
     setData((current) =>
       current
         ? {
@@ -886,31 +884,30 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     applyProjectCommandResult(result);
   }
 
-  // Runs a normal command and records it in session-local history.
+  // Runs a normal command. The server records it in project-wide history.
   async function runCommand(command: HistoryCommand) {
     try {
       setError(null);
       setIsSaving(true);
       const intent = await command.redo();
       await reloadWithIntent(intent ?? null);
-      // Any new forward command invalidates redo history branch.
-      setUndoStack((current) => [...current, command]);
-      setRedoStack([]);
     } catch (err) {
-      setError(normalizeUiError(err));
+      const message = normalizeUiError(err);
+      await loadTree({ showLoading: false });
+      setError(message);
     } finally {
       setIsSaving(false);
     }
   }
 
-  // Replays command in undo/redo mode. Commands encapsulate their own inverse logic.
+  // Applies the next eligible project-wide history operation. Selection is only
-  async function applyHistory(command: HistoryCommand, mode: "undo" | "redo") {
+  // a best-effort local hint; command eligibility and data changes stay server-owned.
+  async function applyHistory(mode: "undo" | "redo") {
     try {
       setError(null);
       setHistoryBusy(true);
       setIsSaving(true);
-      let intent: SelectionIntent | null | void;
+      const intent = selectedCell ? buildSelectionIntent(selectedCell) : null;
-      if (command.persistent) {
       const result =
         mode === "undo"
           ? await undoProjectCommand(
@@ -922,48 +919,32 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
               getExpectedProjectRevision()
             );
       applyProjectCommandResult(result);
-        intent =
+      await Promise.all([
-          mode === "undo"
+        reloadWithIntent(intent),
-            ? command.persistent.undoIntent()
+        loadProjectDeviceList(),
-            : command.persistent.redoIntent();
+      ]);
-      } else {
-        intent =
-          mode === "undo"
-            ? await command.undo()
-            : await command.redo();
-      }
-      await reloadWithIntent(intent ?? null);
-      if (mode === "undo") {
-        setUndoStack((current) => current.slice(0, -1));
-        setRedoStack((current) => [...current, command]);
-      } else {
-        setRedoStack((current) => current.slice(0, -1));
-        setUndoStack((current) => [...current, command]);
-      }
     } catch (err) {
-      setError(normalizeUiError(err));
+      const message = normalizeUiError(err);
+      await loadTree({ showLoading: false });
+      setError(message);
     } finally {
       setIsSaving(false);
       setHistoryBusy(false);
     }
   }
 
-  // Undo command from session-local history stack.
   async function handleUndo() {
-    if (historyBusy || isSaving || undoStack.length === 0) {
+    if (historyBusy || isSaving || !historyState || historyState.undoDepth === 0) {
       return;
     }
-    const command = undoStack[undoStack.length - 1];
+    await applyHistory("undo");
-    await applyHistory(command, "undo");
   }
 
-  // Redo command from session-local history stack.
   async function handleRedo() {
-    if (historyBusy || isSaving || redoStack.length === 0) {
+    if (historyBusy || isSaving || !historyState || historyState.redoDepth === 0) {
       return;
     }
-    const command = redoStack[redoStack.length - 1];
+    await applyHistory("redo");
-    await applyHistory(command, "redo");
   }
 
   // Persists currently sorted block order into section sortOrder values.
@@ -1029,11 +1010,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         setOpenFilterColumn(null);
         return null;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => null,
-        redoIntent: () => null,
-      },
     });
   }
 
@@ -1426,46 +1402,13 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
 
     // Placeholder rows are not persisted entities; editing them materializes a real circuit first.
     if (row.rowType === "placeholder") {
-      let createdCircuitId: string | null = null;
       const command: HistoryCommand = {
         label: "Aus freier Zeile erstellen",
         redo: async () => {
           const selection = await createFromPlaceholder(row.sectionId, editingCell.cellKey, editingCell.draft);
           targetSelection = selection;
-          const createdRow = selection.rowKey.startsWith("circuitCompact:")
-            ? selection.rowKey.replace("circuitCompact:", "")
-            : selection.rowKey.replace("reserveCircuit:", "");
-          createdCircuitId = createdRow;
           return nextSelectionIntent();
         },
-        undo: async () => {
-          return {
-            rowKey: `placeholder:${row.sectionId}`,
-            cellKey: editingCell.cellKey,
-            rowType: "placeholder",
-            sectionId: row.sectionId,
-          };
-        },
-        persistent: {
-          undoIntent: () => ({
-            rowKey: `placeholder:${row.sectionId}`,
-            cellKey: editingCell.cellKey,
-            rowType: "placeholder",
-            sectionId: row.sectionId,
-          }),
-          redoIntent: () =>
-            createdCircuitId
-              ? {
-                  rowKey: targetSelection.rowKey,
-                  cellKey: editingCell.cellKey,
-                  rowType: targetSelection.rowKey.startsWith("circuitCompact:")
-                    ? "circuitCompact"
-                    : "reserveCircuit",
-                  sectionId: row.sectionId,
-                  circuitId: createdCircuitId,
-                }
-              : null,
-        },
       };
       setEditingCell(null);
       await runCommand(command);
@@ -1480,19 +1423,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           await patchCircuit(row.circuit!.id, editingCell.cellKey, next);
           return nextSelectionIntent();
         },
-        undo: async () =>
-          buildSelectionIntent({
-            rowKey: row.rowKey,
-            cellKey: editingCell.cellKey,
-          }),
-        persistent: {
-          undoIntent: () =>
-            buildSelectionIntent({
-              rowKey: row.rowKey,
-              cellKey: editingCell.cellKey,
-            }),
-          redoIntent: nextSelectionIntent,
-        },
       };
       setEditingCell(null);
       await runCommand(command);
@@ -1507,19 +1437,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           await patchDeviceRow(row.device!.id, editingCell.cellKey, next);
           return nextSelectionIntent();
         },
-        undo: async () =>
-          buildSelectionIntent({
-            rowKey: `device:${row.device!.id}`,
-            cellKey: editingCell.cellKey,
-          }),
-        persistent: {
-          undoIntent: () =>
-            buildSelectionIntent({
-              rowKey: `device:${row.device!.id}`,
-              cellKey: editingCell.cellKey,
-            }),
-          redoIntent: nextSelectionIntent,
-        },
       };
       setEditingCell(null);
       await runCommand(command);
@@ -1528,7 +1445,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
 
     if (cell.kind === "deviceField" && row.rowType === "reserveCircuit" && row.circuit) {
       const next = editingCell.draft;
-      let createdRowId: string | null = null;
       const command: HistoryCommand = {
         label: "Gerätezeile im Reservestromkreis erstellen",
         redo: async () => {
@@ -1553,37 +1469,9 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
             snapshot,
             "Gerätezeile im Reservestromkreis erstellen"
           );
-          createdRowId = snapshot.id;
           targetSelection = { rowKey: `circuitCompact:${row.circuit!.id}`, cellKey: editingCell.cellKey };
           return nextSelectionIntent();
         },
-        undo: async () => ({
-          rowKey: `reserveCircuit:${row.circuit!.id}`,
-          cellKey: editingCell.cellKey,
-          rowType: "reserveCircuit",
-          sectionId: row.sectionId,
-          circuitId: row.circuit!.id,
-        }),
-        persistent: {
-          undoIntent: () => ({
-            rowKey: `reserveCircuit:${row.circuit!.id}`,
-            cellKey: editingCell.cellKey,
-            rowType: "reserveCircuit",
-            sectionId: row.sectionId,
-            circuitId: row.circuit!.id,
-          }),
-          redoIntent: () =>
-            createdRowId
-              ? {
-                  rowKey: `circuitCompact:${row.circuit!.id}`,
-                  cellKey: editingCell.cellKey,
-                  rowType: "circuitCompact",
-                  sectionId: row.sectionId,
-                  circuitId: row.circuit!.id,
-                  deviceId: createdRowId,
-                }
-              : null,
-        },
       };
       setEditingCell(null);
       await runCommand(command);
@@ -1605,7 +1493,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     if (!section) {
       return;
     }
-    let createdCircuitId: string | null = null;
     await runCommand({
       label: "Stromkreis hinzufügen",
       redo: async () => {
@@ -1619,7 +1506,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           isReserve: true,
         });
         await persistCircuitInsert(circuit, "Stromkreis hinzufügen");
-        createdCircuitId = circuit.id;
         setActiveSectionId(sectionId);
         return {
           rowKey: `reserveCircuit:${circuit.id}`,
@@ -1629,30 +1515,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           circuitId: circuit.id,
         };
       },
-      undo: async () => ({
-        rowKey: `placeholder:${sectionId}`,
-        cellKey: "equipmentIdentifier",
-        rowType: "placeholder",
-        sectionId,
-      }),
-      persistent: {
-        undoIntent: () => ({
-          rowKey: `placeholder:${sectionId}`,
-          cellKey: "equipmentIdentifier",
-          rowType: "placeholder",
-          sectionId,
-        }),
-        redoIntent: () =>
-          createdCircuitId
-            ? {
-                rowKey: `reserveCircuit:${createdCircuitId}`,
-                cellKey: "equipmentIdentifier",
-                rowType: "reserveCircuit",
-                sectionId,
-                circuitId: createdCircuitId,
-              }
-            : null,
-      },
     });
   }
 
@@ -1663,32 +1525,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
   ) {
     const originalDeviceCount = circuit.deviceRows.length;
     const section = data?.sections.find((entry) => entry.id === sectionId);
-    let createdRowId: string | null = null;
-    const getUndoIntent = (): SelectionIntent => {
-      const rowKey =
-        originalDeviceCount === 0
-          ? `reserveCircuit:${circuit.id}`
-          : originalDeviceCount === 1
-            ? `circuitCompact:${circuit.id}`
-            : afterDeviceRowId
-              ? `device:${afterDeviceRowId}`
-              : `circuitSummary:${circuit.id}`;
-      return {
-        rowKey,
-        cellKey: "displayName",
-        rowType:
-          originalDeviceCount === 0
-            ? "reserveCircuit"
-            : originalDeviceCount === 1
-              ? "circuitCompact"
-              : afterDeviceRowId
-                ? "deviceRow"
-                : "circuitSummary",
-        sectionId,
-        circuitId: circuit.id,
-        deviceId: afterDeviceRowId,
-      };
-    };
     await runCommand({
       label: "Manuelles Gerät hinzufügen",
       redo: async () => {
@@ -1706,7 +1542,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           rowSnapshot,
           "Manuelles Gerät hinzufügen"
         );
-        createdRowId = rowSnapshot.id;
         setActiveSectionId(sectionId);
         return {
           rowKey: originalDeviceCount === 0 ? `circuitCompact:${circuit.id}` : `device:${rowSnapshot.id}`,
@@ -1717,27 +1552,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           deviceId: rowSnapshot.id,
         };
       },
-      undo: async () => getUndoIntent(),
-      persistent: {
-        undoIntent: getUndoIntent,
-        redoIntent: () =>
-          createdRowId
-            ? {
-                rowKey:
-                  originalDeviceCount === 0
-                    ? `circuitCompact:${circuit.id}`
-                    : `device:${createdRowId}`,
-                cellKey: "displayName",
-                rowType:
-                  originalDeviceCount === 0
-                    ? "circuitCompact"
-                    : "deviceRow",
-                sectionId,
-                circuitId: circuit.id,
-                deviceId: createdRowId,
-              }
-            : null,
-      },
     });
   }
 
@@ -1816,14 +1630,10 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
       setError(getProjectDeviceTargetError(device, targetSectionId));
       return;
     }
-    let createdCircuitId: string | null = null;
-    let createdRowId: string | null = null;
     await runCommand({
       label: "Projektgerät als neuen Stromkreis hinzufügen",
       redo: async () => {
         const created = await insertProjectDeviceAsNewCircuit(device, targetSectionId);
-        createdCircuitId = created.circuitId;
-        createdRowId = created.rowId;
         return {
           rowKey: `device:${created.rowId}`,
           cellKey: "displayName",
@@ -1833,31 +1643,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           deviceId: created.rowId,
         };
       },
-      undo: async () => ({
-        rowKey: `placeholder:${targetSectionId}`,
-        cellKey: "displayName",
-        rowType: "placeholder",
-        sectionId: targetSectionId,
-      }),
-      persistent: {
-        undoIntent: () => ({
-          rowKey: `placeholder:${targetSectionId}`,
-          cellKey: "displayName",
-          rowType: "placeholder",
-          sectionId: targetSectionId,
-        }),
-        redoIntent: () =>
-          createdCircuitId && createdRowId
-            ? {
-                rowKey: `device:${createdRowId}`,
-                cellKey: "displayName",
-                rowType: "deviceRow",
-                sectionId: targetSectionId,
-                circuitId: createdCircuitId,
-                deviceId: createdRowId,
-              }
-            : null,
-      },
     });
   }
 
@@ -1884,12 +1669,10 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
       return;
     }
 
-    let createdRowId: string | null = null;
     await runCommand({
       label: "Projektgerät zum Stromkreis hinzufügen",
       redo: async () => {
         const created = await insertProjectDeviceToCircuit(device, circuitId);
-        createdRowId = created.rowId;
         return {
           rowKey: `device:${created.rowId}`,
           cellKey: "displayName",
@@ -1899,33 +1682,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           deviceId: created.rowId,
         };
       },
-      undo: async () => ({
-        rowKey: `circuitSummary:${circuitId}`,
-        cellKey: "displayName",
-        rowType: "circuitSummary",
-        sectionId,
-        circuitId,
-      }),
-      persistent: {
-        undoIntent: () => ({
-          rowKey: `circuitSummary:${circuitId}`,
-          cellKey: "displayName",
-          rowType: "circuitSummary",
-          sectionId,
-          circuitId,
-        }),
-        redoIntent: () =>
-          createdRowId
-            ? {
-                rowKey: `device:${createdRowId}`,
-                cellKey: "displayName",
-                rowType: "deviceRow",
-                sectionId,
-                circuitId,
-                deviceId: createdRowId,
-              }
-            : null,
-      },
     });
   }
 
@@ -2190,14 +1946,10 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     // Project-device drop logic is isolated from row/circuit move logic because
     // it can create new rows/circuits instead of moving existing ones.
     if (intent.kind === "new-circuit") {
-      let createdCircuitId: string | null = null;
-      let createdRowId: string | null = null;
       await runCommand({
         label: "Projektgerät in neuen Stromkreis ziehen",
         redo: async () => {
           const created = await insertProjectDeviceAsNewCircuit(device, intent.sectionId);
-          createdCircuitId = created.circuitId;
-          createdRowId = created.rowId;
           return {
             rowKey: `device:${created.rowId}`,
             cellKey: "displayName",
@@ -2207,30 +1959,13 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
             deviceId: created.rowId,
           };
         },
-        undo: async () => null,
-        persistent: {
-          undoIntent: () => null,
-          redoIntent: () =>
-            createdCircuitId && createdRowId
-              ? {
-                  rowKey: `device:${createdRowId}`,
-                  cellKey: "displayName",
-                  rowType: "deviceRow",
-                  sectionId: intent.sectionId,
-                  circuitId: createdCircuitId,
-                  deviceId: createdRowId,
-                }
-              : null,
-        },
       });
       return;
     }
-    let createdRowId: string | null = null;
     await runCommand({
       label: "Projektgerät in Stromkreis ziehen",
       redo: async () => {
         const created = await insertProjectDeviceToCircuit(device, intent.circuitId);
-        createdRowId = created.rowId;
         return {
           rowKey: `device:${created.rowId}`,
           cellKey: "displayName",
@@ -2240,21 +1975,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           deviceId: created.rowId,
         };
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => null,
-        redoIntent: () =>
-          createdRowId
-            ? {
-                rowKey: `device:${createdRowId}`,
-                cellKey: "displayName",
-                rowType: "deviceRow",
-                sectionId: intent.sectionId,
-                circuitId: intent.circuitId,
-                deviceId: createdRowId,
-              }
-            : null,
-      },
     });
   }
 
@@ -2335,17 +2055,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
           pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
           return null;
         },
-        undo: async () => null,
-        persistent: {
-          undoIntent: () => {
-            pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
-            return null;
-          },
-          redoIntent: () => {
-            pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
-            return null;
-          },
-        },
       });
       return;
     }
@@ -2398,17 +2107,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
         return null;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => {
-          pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
-          return null;
-        },
-        redoIntent: () => {
-          pendingSelectedDeviceRowIdsAfterReload.current = rowIds;
-          return null;
-        },
-      },
     });
   }
 
@@ -2477,19 +2175,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         pendingSelectedCircuitIdsAfterReload.current = sourceCircuitIds;
         return selectionIntent;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => {
-          pendingSelectedCircuitIdsAfterReload.current =
-            sourceCircuitIds;
-          return selectionIntent;
-        },
-        redoIntent: () => {
-          pendingSelectedCircuitIdsAfterReload.current =
-            sourceCircuitIds;
-          return selectionIntent;
-        },
-      },
     });
   }
 
@@ -2533,11 +2218,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         );
         return null;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => null,
-        redoIntent: () => null,
-      },
     });
   }
 
@@ -2563,11 +2243,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         await persistCircuitDelete(circuitId, "Stromkreis löschen");
         return null;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => null,
-        redoIntent: () => null,
-      },
     });
   }
 
@@ -2625,11 +2300,6 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
         applyProjectCommandResult(result);
         return null;
       },
-      undo: async () => null,
-      persistent: {
-        undoIntent: () => null,
-        redoIntent: () => null,
-      },
     });
   }
 
@@ -2755,10 +2425,18 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
     return (
       <div className="tree-editor-shell">
         <div className="editor-toolbar">
-          <button type="button" onClick={() => void handleUndo()} disabled={undoStack.length === 0 || historyBusy || isSaving}>
+          <button
+            type="button"
+            onClick={() => void handleUndo()}
+            disabled={!historyState || historyState.undoDepth === 0 || historyBusy || isSaving}
+          >
             Rückgängig
           </button>
-          <button type="button" onClick={() => void handleRedo()} disabled={redoStack.length === 0 || historyBusy || isSaving}>
+          <button
+            type="button"
+            onClick={() => void handleRedo()}
+            disabled={!historyState || historyState.redoDepth === 0 || historyBusy || isSaving}
+          >
             Wiederholen
           </button>
         <button
@@ -2822,10 +2500,28 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
   return (
     <div className="tree-editor-shell">
       <div className="editor-toolbar">
-        <button type="button" onClick={() => void handleUndo()} disabled={undoStack.length === 0 || historyBusy || isSaving}>
+        <button
+          type="button"
+          onClick={() => void handleUndo()}
+          disabled={!historyState || historyState.undoDepth === 0 || historyBusy || isSaving}
+          title={
+            historyState?.undoDepth
+              ? `${historyState.undoDepth} Änderung(en) können rückgängig gemacht werden.`
+              : undefined
+          }
+        >
           Rückgängig
         </button>
-        <button type="button" onClick={() => void handleRedo()} disabled={redoStack.length === 0 || historyBusy || isSaving}>
+        <button
+          type="button"
+          onClick={() => void handleRedo()}
+          disabled={!historyState || historyState.redoDepth === 0 || historyBusy || isSaving}
+          title={
+            historyState?.redoDepth
+              ? `${historyState.redoDepth} Änderung(en) können wiederholt werden.`
+              : undefined
+          }
+        >
           Wiederholen
         </button>
         {isSortedView ? (

src/frontend/utils/circuit-editor-history.ts

@@ -0,0 +1,27 @@
+import type {
+  CircuitTreeResponseDto,
+  ProjectHistoryStateDto,
+} from "../types";
+
+export interface CircuitEditorSnapshot {
+  tree: CircuitTreeResponseDto;
+  history: ProjectHistoryStateDto;
+}
+
+export async function loadCircuitEditorSnapshot(
+  readTree: () => Promise<CircuitTreeResponseDto>,
+  readHistory: () => Promise<ProjectHistoryStateDto>,
+  maxAttempts = 3
+): Promise<CircuitEditorSnapshot> {
+  for (let attempt = 0; attempt < maxAttempts; attempt += 1) {
+    const tree = await readTree();
+    const history = await readHistory();
+    if (tree.currentRevision === history.currentRevision) {
+      return { tree, history };
+    }
+  }
+
+  throw new Error(
+    "Der Projektstand hat sich während des Ladens geändert. Bitte erneut versuchen."
+  );
+}

tests/circuit-editor-history.test.ts

@@ -0,0 +1,126 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { loadCircuitEditorSnapshot } from "../src/frontend/utils/circuit-editor-history.js";
+import {
+  getProjectHistory,
+  redoProjectCommand,
+  undoProjectCommand,
+} from "../src/frontend/utils/api.js";
+import type {
+  CircuitTreeResponseDto,
+  ProjectHistoryStateDto,
+} from "../src/frontend/types.js";
+
+function tree(currentRevision: number): CircuitTreeResponseDto {
+  return {
+    id: "list-1",
+    projectId: "project-1",
+    distributionBoardId: "board-1",
+    name: "Liste",
+    currentRevision,
+    sections: [],
+  };
+}
+
+function history(currentRevision: number): ProjectHistoryStateDto {
+  return {
+    projectId: "project-1",
+    currentRevision,
+    undoDepth: currentRevision,
+    redoDepth: 0,
+    undoChangeSetId: currentRevision > 0 ? `change-${currentRevision}` : null,
+    redoChangeSetId: null,
+  };
+}
+
+describe("circuit editor history snapshot", () => {
+  it("returns tree and persistent history from the same project revision", async () => {
+    const snapshot = await loadCircuitEditorSnapshot(
+      async () => tree(4),
+      async () => history(4)
+    );
+
+    assert.equal(snapshot.tree.currentRevision, 4);
+    assert.equal(snapshot.history.undoDepth, 4);
+  });
+
+  it("retries when the project changes between the tree and history reads", async () => {
+    const treeRevisions = [4, 5];
+    const historyRevisions = [5, 5];
+    let attempts = 0;
+
+    const snapshot = await loadCircuitEditorSnapshot(
+      async () => tree(treeRevisions[attempts]),
+      async () => history(historyRevisions[attempts++])
+    );
+
+    assert.equal(attempts, 2);
+    assert.equal(snapshot.tree.currentRevision, 5);
+    assert.equal(snapshot.history.currentRevision, 5);
+  });
+
+  it("rejects a snapshot that remains inconsistent", async () => {
+    await assert.rejects(
+      () =>
+        loadCircuitEditorSnapshot(
+          async () => tree(4),
+          async () => history(5),
+          2
+        ),
+      /während des Ladens geändert/
+    );
+  });
+
+  it("loads history and sends revision-safe undo/redo requests", async () => {
+    const requests: Array<{ url: string; body?: unknown }> = [];
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = async (input, init) => {
+      const url = String(input);
+      requests.push({
+        url,
+        ...(init?.body
+          ? { body: JSON.parse(String(init.body)) as unknown }
+          : {}),
+      });
+      const currentRevision = requests.length - 1;
+      const state = history(currentRevision);
+      return new Response(
+        JSON.stringify(
+          init?.method === "POST"
+            ? {
+                revision: {
+                  revisionId: `revision-${currentRevision}`,
+                  changeSetId: `change-${currentRevision}`,
+                  projectId: "project-1",
+                  revisionNumber: currentRevision,
+                  createdAtIso: "2026-07-25T00:00:00.000Z",
+                },
+                history: state,
+              }
+            : state
+        ),
+        { status: 200, headers: { "Content-Type": "application/json" } }
+      );
+    };
+
+    try {
+      await getProjectHistory("project-1");
+      await undoProjectCommand("project-1", 4);
+      await redoProjectCommand("project-1", 5);
+    } finally {
+      globalThis.fetch = originalFetch;
+    }
+
+    assert.deepEqual(requests, [
+      { url: "/api/projects/project-1/history" },
+      {
+        url: "/api/projects/project-1/history/undo",
+        body: { expectedRevision: 4 },
+      },
+      {
+        url: "/api/projects/project-1/history/redo",
+        body: { expectedRevision: 5 },
+      },
+    ]);
+  });
+});