fix: The generate conversation name was not saved (#2836)

api/events/event_handlers/generate_conversation_name_when_first_message_created.py

@@ -26,5 +26,6 @@ def handle(sender, **kwargs):
                 conversation.name = name
             except:
                 pass
-
+                
+            db.session.merge(conversation)
             db.session.commit()