diff --git a/cron-sync.ts b/cron-sync.ts
new file mode 100644
index 0000000..319d371
--- /dev/null
+++ b/cron-sync.ts
@@ -0,0 +1,59 @@
+// cron-sync.ts
+import cron from 'node-cron';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+import dotenv from 'dotenv';
+import http from 'node:http';
+import https from 'node:https';
+import { syncAllDomains } from './app/lib/sync'; // .ts/.js-Endung NICHT nötig mit NodeNext
+
+// __dirname in ESM/TS:
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// .env robust laden – relativ zum Script-Verzeichnis
+dotenv.config({ path: path.join(__dirname, '.env') });
+
+// Keep-Alive für HTTP(S)
+http.globalAgent.keepAlive = true;
+https.globalAgent.keepAlive = true;
+
+// Debug-Logging
+console.log('DATABASE_URL:', process.env.DATABASE_URL);
+console.log('AWS_REGION:', process.env.AWS_REGION);
+console.log('AWS_ACCESS_KEY_ID:', process.env.AWS_ACCESS_KEY_ID ? 'Set' : 'Not set');
+console.log('AWS_SECRET_ACCESS_KEY:', process.env.AWS_SECRET_ACCESS_KEY ? 'Set' : 'Not set');
+
+// Timeout-Wrapper (10 Min Default)
+async function runSyncWithTimeout(timeoutMs = 600_000) {
+  return Promise.race([
+    syncAllDomains(),
+    new Promise((_, reject) => setTimeout(() => reject(new Error('Sync timeout exceeded')), timeoutMs)),
+  ]);
+}
+
+console.log('Starting Cron Job for S3 Sync...');
+
+// Cron: jede volle Stunde
+cron.schedule('*/5 * * * *', async () => {
+  const ts = new Date().toISOString();
+  console.log(`[${ts}] Running scheduled sync...`);
+  try {
+    await runSyncWithTimeout();
+    console.log('✅ Sync completed successfully.');
+  } catch (err) {
+    console.error('❌ Sync error:', err);
+  }
+});
+
+// Optional: initial direkt synchronisieren
+(async () => {
+  const ts = new Date().toISOString();
+  console.log(`[${ts}] Initial sync run on startup...`);
+  try {
+    await runSyncWithTimeout();
+    console.log('✅ Initial sync completed successfully.');
+  } catch (err) {
+    console.error('❌ Initial sync error:', err);
+  }
+})();
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