Update app.py

app.py

@@ -1,11 +1,15 @@
 import streamlit as st
 from datetime import datetime
 import os
+
 # Create a directory to store messages
 messages_dir = "messages"
 if not os.path.exists(messages_dir):
     os.makedirs(messages_dir)
 
+# Create a dictionary to store messages and threads
+messages = {}
+
 def create_thread(thread_id, user_input):
     thread = {'messages': [user_input], 'created_at': datetime.now()}
     messages[thread_id] = thread