Update app.py

app.py

@@ -213,11 +213,12 @@ builder.add_edge("execute_sql", "refine")
 builder.add_edge("refine", END)
 
 memory = SqliteSaver("graph_checkpoint")
-graph = builder.compile(checkpointer=memory, config={"configurable": {"question"}})
+graph = builder.compile(checkpointer=memory)
 
 async def async_chatbot_response(question, model_name):
     inputs = {"question": question}
-    result = await graph.ainvoke(inputs)
+    thread_id = str(uuid4())  # ← ID único da sessão para o checkpoint funcionar
+    result = await graph.ainvoke(inputs, {"configurable": {"thread_id": thread_id}})
     return result["result"]
 
 def toggle_history():