fix: restore and simplify events

backend/src/agent.py

@@ -31,7 +31,7 @@ class Agent:
         agent_class = type(self)
         self.config = {field.name: data.get(field.name, field.default) for field in getattr(agent_class, 'schema_fields', [])}
     
-    def _set_basic_info(self, id, name, user_id=None):
+    def _set_basic_info(self, id, name, user_id):
         self.id = id
         self.name = name
         self.user_id = user_id