Update track_client_activity to handle missing rustdesk_id

- When rustdesk_id is not provided, update the most recent client for the API token
- This ensures user agents are updated even for clients not sending rustdesk_id
- Improves client reconnection handling

app/api/routes.py

@@ -818,10 +818,11 @@ def track_client_activity(api_token, rustdesk_id=None):
         ip_address = request.headers.get('X-Forwarded-For', request.remote_addr)
         user_agent = request.headers.get('User-Agent')
 
-        # Check if client already exists
+        if rustdesk_id:
+            # If rustdesk_id is provided, use specific client
             client = ClientActivity.query.filter_by(
                 api_token_id=api_token.id,
-            rustdesk_id=rustdesk_id or 'unknown'
+                rustdesk_id=rustdesk_id
             ).first()
 
             if client:
@@ -833,7 +834,27 @@ def track_client_activity(api_token, rustdesk_id=None):
                 # Create new client
                 client = ClientActivity(
                     api_token_id=api_token.id,
-                rustdesk_id=rustdesk_id or 'unknown',
+                    rustdesk_id=rustdesk_id,
+                    ip_address=ip_address,
+                    user_agent=user_agent
+                )
+                db.session.add(client)
+        else:
+            # If no rustdesk_id provided, update the most recent client for this API token
+            client = ClientActivity.query.filter_by(
+                api_token_id=api_token.id
+            ).order_by(ClientActivity.last_seen.desc()).first()
+
+            if client:
+                # Update most recent client
+                client.last_seen = datetime.utcnow()
+                client.ip_address = ip_address
+                client.user_agent = user_agent
+            else:
+                # Create new client with unknown rustdesk_id
+                client = ClientActivity(
+                    api_token_id=api_token.id,
+                    rustdesk_id='unknown',
                     ip_address=ip_address,
                     user_agent=user_agent
                 )