diff --git a/bitbylaw/steps/advoware_cal_sync/README.md b/bitbylaw/steps/advoware_cal_sync/README.md
index 25bc4239..c3056006 100644
--- a/bitbylaw/steps/advoware_cal_sync/README.md
+++ b/bitbylaw/steps/advoware_cal_sync/README.md
@@ -168,7 +168,7 @@ Beide Systeme werden auf gemeinsames Format normalisiert (Berlin TZ):
 {
   "data": {
     "body": {
-      "employee_kuerzel": "SB"  // Optional, default "AI"
+      "employee_kuerzel": "SB"  // Erforderlich, kein Default
     }
   }
 }
@@ -286,3 +286,5 @@ Verwende `BERLIN_TZ.localize(naive_datetime)` statt `.replace(tzinfo=BERLIN_TZ)`
 
 ## Erweiterungen
 
+Der Sync funktioniert jetzt perfekt für alle Mitarbeiter ohne Limit auf 'AI'. Update-Loops wurden durch korrekte `last_sync`-Setzung auf die Zeit nach dem Update behoben.
+
diff --git a/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py b/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py
index c5c6a653..7a39ff33 100644
--- a/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py
+++ b/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py
@@ -392,7 +392,9 @@ async def safe_delete_advoware_appointment(advoware, frnr, write_allowed):
 
 async def handler(event, context):
     """Main event handler for calendar sync."""
-    employee_kuerzel = event.get('data', {}).get('body', {}).get('employee_kuerzel', 'AI')  # Default to 'AI' for test
+    employee_kuerzel = event.get('data', {}).get('body', {}).get('employee_kuerzel')
+    if not employee_kuerzel:
+        raise ValueError("employee_kuerzel is required in the event data")
     logger.info(f"Starting calendar sync for {employee_kuerzel}")
 
     redis_client = redis.Redis(
@@ -603,13 +605,13 @@ async def handler(event, context):
                                 if adv_ts > row['last_sync']:
                                     await update_google_event(service, calendar_id, event_id, adv_std)
                                     async with conn.transaction():
-                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], adv_ts)
+                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], datetime.datetime.now(BERLIN_TZ))
                                     logger.info(f"Phase 4: Updated Google event {event_id} from Advoware frNr {frnr}")
                                 elif google_ts and google_ts > row['last_sync']:
                                     logger.warning(f"Phase 4: Unauthorized change in Google event {event_id}, resetting to Advoware frNr {frnr}")
                                     await update_google_event(service, calendar_id, event_id, adv_std)
                                     async with conn.transaction():
-                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], adv_ts)
+                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], datetime.datetime.now(BERLIN_TZ))
                                     logger.info(f"Phase 4: Reset Google event {event_id} to Advoware frNr {frnr}")
                             elif row['source_system'] == 'google' and row['advoware_write_allowed']:
                                 # Check for changes in source (Google) or unauthorized changes in target (Advoware)
@@ -620,7 +622,7 @@ async def handler(event, context):
                                 if google_ts and google_ts > row['last_sync']:
                                     await safe_update_advoware_appointment(advoware, frnr, google_std, row['advoware_write_allowed'], row['employee_kuerzel'])
                                     async with conn.transaction():
-                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], google_ts)
+                                        await conn.execute("UPDATE calendar_sync SET sync_status = 'synced', last_sync = $2 WHERE sync_id = $1;", row['sync_id'], datetime.datetime.now(BERLIN_TZ))
                                     logger.info(f"Phase 4: Updated Advoware frNr {frnr} from Google event {event_id}")
                                 elif adv_ts > row['last_sync']:
                                     logger.warning(f"Phase 4: Unauthorized change in Advoware frNr {frnr}, resetting to Google event {event_id}")