fix(avatar): acknowledge BOXIM messages as read

digital-avatar-app/backend/services/takeover_service.py

@@ -268,6 +268,7 @@ class TakeoverService:
             messages.sort(key=lambda item: (_numeric_id(item.get("id")), item.get("sendTime") or 0))
             priming = not bool(cursor.initialized)
             max_message_id = _numeric_id(cursor.last_message_id)
+            read_receipts: dict[str, int] = {}
             for message in messages:
                 self._record_message(
                     db,
@@ -276,7 +277,19 @@ class TakeoverService:
                     message,
                     schedule_reply=not priming,
                 )
-                max_message_id = max(max_message_id, _numeric_id(message.get("id")))
+                message_id = _numeric_id(message.get("id"))
+                max_message_id = max(max_message_id, message_id)
+                send_id = str(message.get("sendId") or "")
+                recv_id = str(message.get("recvId") or "")
+                if recv_id == cursor.boxim_owner_id and send_id and message_id:
+                    read_receipts[send_id] = max(read_receipts.get(send_id, 0), message_id)
+
+            # BOXIM publishes this HTTP state change to connected socket clients.
+            # Do it before advancing the cursor so a failed receipt is retried.
+            for peer_id, message_id in read_receipts.items():
+                await self.boxim.mark_private_messages_read(
+                    session["access_token"], peer_id, message_id
+                )
 
             cursor.last_message_id = str(max_message_id)
             cursor.initialized = True