Update app.py

app.py

@@ -138,7 +138,7 @@ def cleanup_inactive_users():
 def get_user_history(uid):
     if uid not in user_memory:
         try:
-            resp = requests.get(f"{LAMBDA_URL}?user_id={uid}", timeout=5)
+            resp = requests.get(f"{LAMBDA_URL}?userid={uid}", timeout=5)
             resp.raise_for_status()
             loaded_history = resp.json().get("history", [])
             # Only keep the most recent MAX_MEMORY_MESSAGES when loading