comment on why since_id is double-checked.

bot/bot_app.py

@@ -27,7 +27,11 @@ def stream_notifications():
                 for notification in notifications:
                     notif_id = notification.id
 
-                    # Skip old or same ID notifications
+                    # Double-check filtering: Even though we pass since_id to the API,
+                    # we manually filter again for reliability because:
+                    # 1. API might ignore since_id if it's too old (server downtime)
+                    # 2. Pagination limits might cause missed notifications  
+                    # 3. Race conditions between fetch and save operations
                     if last_seen_id is not None and notif_id <= last_seen_id:
                         continue