test(17-02): D-06 ownerTenantId tagging for RSS ingestion + seed idempotency

- RssAdapter.fetchTenders tags every record from a feed with a tenantId
  with the same D-13 ownerTenantId origin marking email-alert records
  carry since Phase 14; platform-wide feeds (no tenantId) stay unmarked.
  The pure parseFeed mapping is untouched — tagging happens in the
  fan-out loop that knows which row a batch came from
- Extracted the service.bund.de seed out of TendersModule.onModuleInit
  into seedServiceBundRssFeed() (tenders.seed.ts, same pattern as the
  existing seedTendersModule), so the find-then-create idempotency added
  in Task 1 is unit-tested directly instead of only via a Nest bootstrap
- New rss-feed-migration-sql.spec.ts: text-only check of the Task 1
  migration file (nullable columns, dropped/created indexes, no
  existing-row mutation, correct ordering)

- Files modified: apps/api/src/tenders/adapters/rss.adapter.ts, apps/api/src/tenders/tenders.module.ts, apps/api/src/tenders/tenders.seed.ts, apps/api/src/tenders/adapters/rss.adapter.spec.ts, apps/api/src/tenders/tenders.seed.spec.ts, apps/api/src/tenders/rss-feed-migration-sql.spec.ts

apps/api/src/tenders/tenders.seed.spec.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it, vi } from 'vitest';
-import { seedTendersModule } from './tenders.seed';
+import { SERVICE_BUND_RSS_URL, seedServiceBundRssFeed, seedTendersModule } from './tenders.seed';
 
 describe('seedTendersModule', () => {
   it('calls moduleRegistryService.seedModule once with tender-radar slug', async () => {
@@ -16,3 +16,83 @@ describe('seedTendersModule', () => {
     expect(arg.description).toHaveProperty('en');
   });
 });
+
+/**
+ * seedServiceBundRssFeed.spec — proves the Phase 17, Plan 02 (D-02) fix:
+ * "upsert on url" stopped compiling once the unique index moved to
+ * (userId, url) — Prisma's generated compound-unique input type requires a
+ * plain `string` userId, which a platform-wide row (userId = null) can
+ * never provide. Uses "find a platform-wide row with this url first, only
+ * create if none exists" instead. In-memory fake, no live DB connection.
+ */
+function makeFakePrisma() {
+  const rows = new Map<string, any>();
+  let seq = 0;
+
+  return {
+    tenderRssFeedSource: {
+      findFirst: async ({ where }: any) => {
+        for (const row of rows.values()) {
+          if (
+            row.userId === where.userId &&
+            row.url === where.url
+          ) {
+            return row;
+          }
+        }
+        return null;
+      },
+      create: async ({ data }: any) => {
+        seq += 1;
+        const row = { id: `feed-${seq}`, userId: null, tenantId: null, ...data };
+        rows.set(row.id, row);
+        return row;
+      },
+    },
+    __rows: rows,
+  };
+}
+
+describe('seedServiceBundRssFeed', () => {
+  it('creates a single active, ownerless service.bund.de row when none exists yet', async () => {
+    const prisma = makeFakePrisma();
+
+    await seedServiceBundRssFeed(prisma as any);
+
+    expect(prisma.__rows.size).toBe(1);
+    const [row] = [...prisma.__rows.values()];
+    expect(row.url).toBe(SERVICE_BUND_RSS_URL);
+    expect(row.label).toBe('service-bund');
+    expect(row.isActive).toBe(true);
+    expect(row.userId).toBeNull();
+  });
+
+  it('running the seed twice in a row (simulating a second app start) leaves exactly one ownerless row (D-02, idempotent)', async () => {
+    const prisma = makeFakePrisma();
+
+    await seedServiceBundRssFeed(prisma as any);
+    await seedServiceBundRssFeed(prisma as any);
+
+    expect(prisma.__rows.size).toBe(1);
+    const [row] = [...prisma.__rows.values()];
+    expect(row.userId).toBeNull();
+  });
+
+  it('does not touch an existing personal feed at the same URL owned by a real user', async () => {
+    const prisma = makeFakePrisma();
+    prisma.__rows.set('personal-1', {
+      id: 'personal-1',
+      userId: 'user-a',
+      tenantId: 'tenant-a',
+      url: SERVICE_BUND_RSS_URL,
+      label: 'mein-service-bund-feed',
+      isActive: true,
+    });
+
+    await seedServiceBundRssFeed(prisma as any);
+
+    expect(prisma.__rows.size).toBe(2);
+    const platformRows = [...prisma.__rows.values()].filter((r: any) => r.userId === null);
+    expect(platformRows).toHaveLength(1);
+  });
+});