fix moderation

app.py

@@ -235,6 +235,17 @@ def send_message(channel: str, username: str, message: str):
         chatbot_formatted = format_history_for_chatbot_display(current_history)
         return current_history, roundtable_json, chatbot_formatted, roundtable_json, ""
     
+    moderation_result = moderate_with_llm(message)
+    if moderation_result:
+        with history_lock:            
+            system_msg = {"role": "system_error", "content": moderation_result}
+            chat_histories[channel].append(system_msg)                        
+            final_history = chat_histories.get(channel, [])
+            final_roundtable_json = json.dumps(roundtable_states.get(channel, {}))
+
+        final_chatbot_formatted = format_history_for_chatbot_display(final_history)        
+        return final_history, final_roundtable_json, final_chatbot_formatted, final_roundtable_json, ""
+    
     user_msg = {"role": "user", "username": username, "content": message}
     with history_lock:
         chat_histories[channel].append(user_msg)