feat: platform backbone and field capture complete (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), all tasks reviewed:
- webhooks with delivery table, retries and stable delivery id
- calendar handlers; a finished task removes its Outlook event
- tasks, automations, inspections, varroa, treatments, feedings,
  harvests, colonies, wintering, stock and bottling record domain events
  in the same transaction; legacy post-commit calls removed
- row locks through one helper (lockRowForUpdate, lockRowsForShare,
  lockRowsForUpdate)
- job framework with JobRun, cli exit codes, cleanup, task templates,
  daily evaluation, hourly app-backup and the rekey job
- system API and page "Verwaltung > System" with retry
- @nestjs/schedule removed, guard tests against in-process schedulers

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), all tasks reviewed:
- inspection photo offline without metadata
- bulk capture for treatments, feedings and varroa (backend + frontend)
- offline stand mode with service worker, offline pages and packs
- offline session, cold start and logout on shared devices

Docs: ARCHITECTURE.md assumptions and sections updated, TASKS.md.
Gates: backend lint, typecheck, 1770 unit, 420 e2e, build, no schema
drift; frontend lint, typecheck, 913 tests, build. Not rolled out.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/test/tasks.e2e-spec.ts

@@ -5,6 +5,7 @@ import { App } from 'supertest/types';
 import { PrismaService } from '../src/prisma/prisma.service';
 import { createTestApp } from './utils/create-test-app';
 import { login } from './utils/api';
+import { drainDomainEvents } from './utils/domain-events';
 
 interface TaskBody {
   id: string;
@@ -24,6 +25,13 @@ describe('Tasks (e2e)', () => {
   let staffToken: string;
   let readonlyToken: string;
   let taskId: string;
+  const taskIds: string[] = [];
+
+  const eventsOf = (id: string, type: string) =>
+    prisma.domainEvent.findMany({
+      where: { aggregateType: 'Task', aggregateId: id, type },
+      include: { deliveries: true },
+    });
 
   beforeAll(async () => {
     app = await createTestApp();
@@ -53,9 +61,11 @@ describe('Tasks (e2e)', () => {
   });
 
   afterAll(async () => {
-    if (taskId) {
-      await prisma.task.delete({ where: { id: taskId } });
-    }
+    // Deliveries go with their event (ON DELETE CASCADE).
+    await prisma.domainEvent.deleteMany({
+      where: { aggregateType: 'Task', aggregateId: { in: taskIds } },
+    });
+    await prisma.task.deleteMany({ where: { id: { in: taskIds } } });
     await prisma.refreshToken.deleteMany({
       where: { userId: { in: [staffId, readonlyId] } },
     });
@@ -84,9 +94,63 @@ describe('Tasks (e2e)', () => {
       .expect(201);
     const task = response.body as TaskBody;
     taskId = task.id;
+    taskIds.push(taskId);
     expect(task.status).toBe('OPEN');
   });
 
+  it('POST /tasks leaves a TaskCreated event whose calendar and webhook deliveries are DONE after draining', async () => {
+    const response = await request(app.getHttpServer())
+      .post('/api/v1/tasks')
+      .set('Authorization', `Bearer ${staffToken}`)
+      .send({ title: 'Mit Termin', dueDate: '2027-05-01T00:00:00.000Z' })
+      .expect(201);
+    const id = (response.body as TaskBody).id;
+    taskIds.push(id);
+
+    // Recorded in the request's transaction, next to the audit entry.
+    const [recorded] = await eventsOf(id, 'TaskCreated');
+    expect(recorded).toMatchObject({
+      status: 'PENDING',
+      actorUserId: staffId,
+      payload: {
+        relatedType: 'GENERAL',
+        relatedId: null,
+        dueDate: '2027-05-01',
+      },
+    });
+    await expect(
+      prisma.auditLog.count({
+        where: {
+          entityType: 'Task',
+          entityId: id,
+          action: 'CREATE',
+          userId: staffId,
+        },
+      }),
+    ).resolves.toBe(1);
+
+    await drainDomainEvents(app, [id]);
+
+    const [drained, ...more] = await eventsOf(id, 'TaskCreated');
+    expect(more).toHaveLength(0);
+    expect(drained.status).toBe('DONE');
+    expect(drained.deliveries).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          handler: 'calendar-sync.task',
+          status: 'DONE',
+        }),
+        expect.objectContaining({
+          handler: 'webhooks.forward',
+          status: 'DONE',
+        }),
+      ]),
+    );
+    expect(drained.deliveries.every((entry) => entry.status === 'DONE')).toBe(
+      true,
+    );
+  });
+
   it('lists tasks filtered by status', async () => {
     const response = await request(app.getHttpServer())
       .get('/api/v1/tasks?status=OPEN')
@@ -121,6 +185,14 @@ describe('Tasks (e2e)', () => {
     expect(auditEntry?.afterData).toEqual(
       expect.objectContaining({ dueDate: null }),
     );
+    const updates = await eventsOf(taskId, 'TaskUpdated');
+    expect(updates.map((event) => event.payload)).toEqual(
+      expect.arrayContaining([
+        { status: 'OPEN', dueDate: '2026-08-01' },
+        { status: 'OPEN', dueDate: null },
+      ]),
+    );
+    expect(updates).toHaveLength(2);
   });
 
   it('rejects null for the required title', () => {
@@ -131,7 +203,7 @@ describe('Tasks (e2e)', () => {
       .expect(400);
   });
 
-  it('completes a task', async () => {
+  it('completes a task and records TaskCompleted once, also when completed again', async () => {
     const response = await request(app.getHttpServer())
       .post(`/api/v1/tasks/${taskId}/complete`)
       .set('Authorization', `Bearer ${staffToken}`)
@@ -139,5 +211,18 @@ describe('Tasks (e2e)', () => {
     const task = response.body as TaskBody;
     expect(task.status).toBe('DONE');
     expect(task.completedAt).not.toBeNull();
+
+    const repeated = await request(app.getHttpServer())
+      .post(`/api/v1/tasks/${taskId}/complete`)
+      .set('Authorization', `Bearer ${staffToken}`)
+      .expect(201);
+    expect((repeated.body as TaskBody).completedAt).toBe(task.completedAt);
+
+    const completions = await eventsOf(taskId, 'TaskCompleted');
+    expect(completions).toHaveLength(1);
+    expect(completions[0]).toMatchObject({
+      actorUserId: staffId,
+      payload: { relatedType: 'GENERAL', relatedId: null },
+    });
   });
 });