diff --git a/bitbylaw/config.py b/bitbylaw/config.py
index 7a2a24fb..ab2ae933 100644
--- a/bitbylaw/config.py
+++ b/bitbylaw/config.py
@@ -37,4 +37,4 @@ class Config:
 
     # Calendar Sync settings
     CALENDAR_SYNC_ANONYMIZE_GOOGLE_EVENTS = os.getenv('CALENDAR_SYNC_ANONYMIZE_GOOGLE_EVENTS', 'true').lower() == 'true'
-    ADVOWARE_WRITE_PROTECTION = os.getenv('ADVOWARE_WRITE_PROTECTION', 'false').lower() == 'true'
\ No newline at end of file
+    ADVOWARE_WRITE_PROTECTION = True
\ No newline at end of file
diff --git a/bitbylaw/steps/advoware_cal_sync/calendar_sync_cron_step.py b/bitbylaw/steps/advoware_cal_sync/calendar_sync_cron_step.py
index 841d98d9..734c9cff 100644
--- a/bitbylaw/steps/advoware_cal_sync/calendar_sync_cron_step.py
+++ b/bitbylaw/steps/advoware_cal_sync/calendar_sync_cron_step.py
@@ -12,7 +12,7 @@ config = {
     'emits': ['calendar.sync.triggered']
 }
 
-async def handler(event, context):
+async def handler(context):
     try:
         # Prüfe ob bereits ein Sync läuft
         redis_client = redis.Redis(
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 620f5b9c..a8c1476a 100644
--- a/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py
+++ b/bitbylaw/steps/advoware_cal_sync/calendar_sync_event_step.py
@@ -29,7 +29,7 @@ FETCH_TO = (datetime.datetime.now(BERLIN_TZ) + timedelta(days=730)).strftime('%Y
 CALENDAR_SYNC_LOCK_KEY = 'calendar_sync_lock'
 
 # Relevant fields for data comparison (simple diff)
-COMPARISON_FIELDS = ['text', 'notiz', 'ort', 'datum', 'uhrzeitBis', 'datumBis', 'dauertermin', 'turnus', 'turnusArt']
+COMPARISON_FIELDS = ['text', 'notiz', 'ort', 'datum', 'uhrzeitBis', 'datumBis', 'dauertermin', 'turnus', 'turnusArt', 'recurrence']
 
 async def connect_db():
     """Connect to Postgres DB from Config."""
@@ -91,6 +91,23 @@ async def ensure_google_calendar(service, employee_kuerzel):
         logger.error(f"Failed to ensure Google calendar for {employee_kuerzel}: {e}")
         raise
 
+async def share_google_calendar(service, calendar_id, email):
+    """Share Google Calendar with specific email."""
+    try:
+        acl_rule = {
+            'scope': {'type': 'user', 'value': email},
+            'role': 'owner'
+        }
+        result = service.acl().insert(calendarId=calendar_id, body=acl_rule).execute()
+        logger.info(f"Shared calendar {calendar_id} with {email}")
+        return result
+    except HttpError as e:
+        logger.error(f"Google API error sharing calendar {calendar_id} with {email}: {e}")
+        raise
+    except Exception as e:
+        logger.error(f"Failed to share Google calendar {calendar_id} with {email}: {e}")
+        raise
+
 async def fetch_advoware_appointments(advoware, employee_kuerzel):
     """Fetch Advoware appointments in range."""
     try:
@@ -135,6 +152,39 @@ async def fetch_google_events(service, calendar_id):
         logger.error(f"Failed to fetch Google events: {e}")
         raise
 
+def generate_rrule(turnus, turnus_art, datum_bis):
+    """Generate RRULE string from Advoware turnus and turnusArt."""
+    freq_map = {
+        1: 'DAILY',
+        2: 'WEEKLY', 
+        3: 'MONTHLY',
+        4: 'YEARLY'
+    }
+    if turnus_art not in freq_map:
+        return None
+    freq = freq_map[turnus_art]
+    
+    # Parse datum_bis to date and limit to max 2 years from now to avoid Google Calendar limits
+    try:
+        if 'T' in datum_bis:
+            bis_dt = datetime.datetime.fromisoformat(datum_bis.replace('Z', ''))
+        else:
+            bis_dt = datetime.datetime.fromisoformat(datum_bis + 'T00:00:00')
+        
+        # Limit to max 2 years from now
+        max_until = datetime.datetime.now() + timedelta(days=730)  # 2 years
+        if bis_dt > max_until:
+            bis_dt = max_until
+            logger.info(f"Limited recurrence until date to {bis_dt.date()} to avoid Google Calendar limits")
+        
+        until_date = bis_dt.strftime('%Y%m%d')
+    except ValueError:
+        logger.warning(f"Invalid datum_bis: {datum_bis}, skipping recurrence")
+        return None
+    
+    rrule = f"RRULE:FREQ={freq};INTERVAL={turnus};UNTIL={until_date}"
+    return rrule
+
 def standardize_appointment_data(data, source):
     """Standardize data from Advoware or Google to comparable dict, with TZ handling."""
     if source == 'advoware':
@@ -173,6 +223,17 @@ def standardize_appointment_data(data, source):
             notiz = data.get('notiz', '')
             ort = data.get('ort', '')
         
+        # Generate recurrence if dauertermin
+        recurrence = None
+        if data.get('dauertermin', 0) == 1:
+            turnus = data.get('turnus', 1)
+            turnus_art = data.get('turnusArt', 1)
+            datum_bis = data.get('datumBis', '')
+            if datum_bis:
+                recurrence = generate_rrule(turnus, turnus_art, datum_bis)
+                if recurrence:
+                    recurrence = [recurrence]  # Google expects list of strings
+        
         return {
             'start': start_dt,
             'end': end_dt,
@@ -182,7 +243,7 @@ def standardize_appointment_data(data, source):
             'dauertermin': data.get('dauertermin', 0),
             'turnus': data.get('turnus', 0),
             'turnusArt': data.get('turnusArt', 0),
-            'recurrence': None  # No RRULE in Advoware
+            'recurrence': recurrence
         }
     elif source == 'google':
         start_obj = data.get('start', {})
@@ -432,6 +493,11 @@ async def handler(event, context):
                 logger.warning(f"Mitarbeiter ohne Kürzel übersprungen: {employee}")
                 continue
 
+            # DEBUG: Nur für Nutzer RO syncen
+            if kuerzel != 'ST':
+                logger.info(f"DEBUG: Überspringe {kuerzel}, nur RO wird gesynct")
+                continue
+
             logger.info(f"Starting calendar sync for {kuerzel}")
 
             redis_client = redis.Redis(