fix: restore and simplify events

backend/src/app_mixins/chat.py

@@ -170,7 +170,6 @@ class ChatMixin:
 
             def chunk_fn (chunk):
                 message.content = content.content + "..."
-                notify_users()
             async def end_fn ():
                 message.content = content.content
                 if db.is_instance(message):