test: Backend-e2e in CI stabil (eigene Jahre, Sperren, ein Server je App)

- daily-evaluation nutzt die Jahre 2011/2012 statt 2001, damit der Job nicht
  die Daten von autopilot und reminders liest und verändert.
- throttler: app.listen(0) einmal je App statt eines Servers je Anfrage
  (ECONNRESET bei 40 parallelen Anfragen).
- outbox-claims: 120 s Zeitlimit für 2000 sequentielle Anweisungen.
- migration-harness: eine `migrate deploy` zur Zeit über eine eigene
  Advisory-Sperre (P1002 bei parallelen Migrations-Suites).
- authority-notices und authority-notices-herd laufen über
  exclusive-suite nacheinander; Herd-Wiederholung räumt eigene Entwürfe.

Refs #32

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

ApiCore-Backend/test/utils/migration-harness.ts

@@ -19,6 +19,15 @@ const PRISMA_CLI = path.join(
   'index.js',
 );
 const DEPLOY_TIMEOUT_MS = 100_000;
+/**
+ * `prisma migrate deploy` takes pg_advisory_lock(72707369) and gives up after
+ * 10 s. Advisory locks are per DATABASE, not per schema, so scratch schemas
+ * of parallel migration suites (honey-ledger, t4, t6) collide on it (P1002 in
+ * CI). The harness therefore runs one deploy at a time across jest workers
+ * with its own, blocking advisory lock; the session lock disappears with the
+ * connection should a worker die.
+ */
+const HARNESS_DEPLOY_LOCK_KEY = 72707370;
 const SCHEMA_NAME_PATTERN = /^mig_[0-9a-f]{12}$/;
 
 export interface ScratchDatabase {
@@ -119,21 +128,28 @@ export async function createScratchDatabase(
         copied.add(name);
       }
     }
-    await execFileAsync(
-      process.execPath,
-      [
-        PRISMA_CLI,
-        'migrate',
-        'deploy',
-        '--config',
-        path.join(workDir, 'prisma.config.ts'),
-      ],
-      {
-        cwd: BACKEND_ROOT,
-        env: { ...process.env, MIGRATION_HARNESS_URL: scratchUrl },
-        timeout: DEPLOY_TIMEOUT_MS,
-      },
-    );
+    await admin.query('SELECT pg_advisory_lock($1)', [HARNESS_DEPLOY_LOCK_KEY]);
+    try {
+      await execFileAsync(
+        process.execPath,
+        [
+          PRISMA_CLI,
+          'migrate',
+          'deploy',
+          '--config',
+          path.join(workDir, 'prisma.config.ts'),
+        ],
+        {
+          cwd: BACKEND_ROOT,
+          env: { ...process.env, MIGRATION_HARNESS_URL: scratchUrl },
+          timeout: DEPLOY_TIMEOUT_MS,
+        },
+      );
+    } finally {
+      await admin.query('SELECT pg_advisory_unlock($1)', [
+        HARNESS_DEPLOY_LOCK_KEY,
+      ]);
+    }
   };
 
   let client: Client | null = null;