Refactor calendar sync to prioritize oldest synced employees with human-readable timestamps

bitbylaw/steps/advoware_cal_sync/calendar_sync_utils.py

@@ -98,9 +98,19 @@ def set_employee_lock(redis_client, kuerzel, triggered_by, context=None):
     return True
 
 def clear_employee_lock(redis_client, kuerzel, context=None):
-    """Clear lock for employee sync operation."""
+    """Clear lock for employee sync operation and update last-synced timestamp."""
     try:
         employee_lock_key = f'calendar_sync_lock_{kuerzel}'
+        employee_last_synced_key = f'calendar_sync_last_synced_{kuerzel}'
+        
+        # Update last-synced timestamp (no TTL, persistent)
+        import time
+        current_time = int(time.time())
+        redis_client.set(employee_last_synced_key, current_time)
+        
+        # Delete the lock
         redis_client.delete(employee_lock_key)
+        
+        log_operation('debug', f"Cleared lock and updated last-synced for {kuerzel} to {current_time}", context=context)
     except Exception as e:
-        log_operation('warning', f"Failed to clear lock for {kuerzel}: {e}", context=context)
+        log_operation('warning', f"Failed to clear lock and update last-synced for {kuerzel}: {e}", context=context)