feat(api): photo, upload, outbox schema

Task 10: photos/photo_variants/upload_sessions/photo_jobs/outbox_events
on the CN schema (flat string FKs, no Prisma relations); migration
20260917120827_photo_upload_domain rewritten to utf8mb4_0900_bin per the
固化 collation recipe; reset.ts table order extended; one semantics e2e
case for photo_jobs @@unique([photoId, type]) and the upload_sessions
A03 idempotency anchor @@unique([userId, clientTaskId]).

Co-Authored-By: Claude Code <noreply@anthropic.com>

services/api/test/db.semantics.e2e-spec.ts

@@ -9,6 +9,9 @@
 // 5) 相册域（Task 9 增补）：多语言翻译按 @@unique([albumId, locale]) 双向
 //    精确命中、publicToken 唯一约束拒绝重复（P2002）——相册域为扁平字符串
 //    外键（无 Prisma relation），完整 CRUD 语义由 Task 15 展开。
+// 6) 照片与上传域（Task 10 增补）：photo_jobs 按 @@unique([photoId, type])
+//    拒绝重复作业、upload_sessions 按 @@unique([userId, clientTaskId]) 拒绝
+//    重复会话（P2002）——后者是断点续传幂等锚点（A03）。
 import { PrismaClient } from '@photo/db-cn';
 import { resetDb } from './reset';
 
@@ -164,4 +167,55 @@ describe('db semantics (e2e)', () => {
       }),
     ).rejects.toMatchObject({ code: 'P2002' });
   });
+
+  it('photo_jobs and upload_sessions enforce their unique anchors (Task 10)', async () => {
+    const photo = await prisma.photos.create({
+      data: {
+        albumId: 'album-jobs-e2e',
+        uploaderId: 'uploader-flat-fk',
+        objectKey: 'originals/album-jobs-e2e/photo-001.jpg',
+        bytes: 1024,
+      },
+    });
+    await prisma.photo_jobs.create({
+      data: { photoId: photo.id, type: 'process' },
+    });
+
+    // 同一照片同类作业唯一（worker 任务领取的防重入锚点）。
+    await expect(
+      prisma.photo_jobs.create({
+        data: { photoId: photo.id, type: 'process' },
+      }),
+    ).rejects.toMatchObject({ code: 'P2002' });
+
+    await prisma.upload_sessions.create({
+      data: {
+        userId: 'uploader-flat-fk',
+        albumId: 'album-jobs-e2e',
+        clientTaskId: 'task-0001',
+        photoId: photo.id,
+        objectKey: 'staging/album-jobs-e2e/task-0001.jpg',
+        expectedBytes: 1024,
+        contentType: 'image/jpeg',
+        expiresAt: new Date(Date.now() + 60_000),
+      },
+    });
+
+    // 同一 (userId, clientTaskId) 唯一——断点续传幂等锚点（A03）。
+    // photoId/objectKey 换新值，确保 P2002 只可能来自复合唯一键本身。
+    await expect(
+      prisma.upload_sessions.create({
+        data: {
+          userId: 'uploader-flat-fk',
+          albumId: 'album-jobs-e2e',
+          clientTaskId: 'task-0001',
+          photoId: 'other-photo-cuid',
+          objectKey: 'staging/album-jobs-e2e/task-0002.jpg',
+          expectedBytes: 2048,
+          contentType: 'image/jpeg',
+          expiresAt: new Date(Date.now() + 60_000),
+        },
+      }),
+    ).rejects.toMatchObject({ code: 'P2002' });
+  });
 });