Ensure HF dataset downloads on startup

main_api.py

@@ -13,12 +13,13 @@ import uvicorn
 
 # import your existing modules (assumed in same directory)
 from memory_store import init_db, save_message, get_last_messages, clear_user_memory, build_gradio_history  # :contentReference[oaicite:4]{index=4}
-from chatbot_retriever import build_or_load_indexes, hybrid_retrieve, retrieve_node_from_rows, load_all_docs  # :contentReference[oaicite:5]{index=5}
+from chatbot_retriever import build_or_load_indexes, hybrid_retrieve, retrieve_node_from_rows, load_all_docs, ensure_data_dir  # :contentReference[oaicite:5]{index=5}
 from chatbot_graph import SYSTEM_PROMPT, call_llm, _extract_answer_from_response  # :contentReference[oaicite:6]{index=6}
 
+ensure_data_dir()
 # ----------------- CORS SETUP -----------------
 from fastapi.middleware.cors import CORSMiddleware
-
+ensure_data_dir()  
 app = FastAPI(title="RAG Chat Backend", version="1.0")
 
 from fastapi.middleware.cors import CORSMiddleware