add logging config

app.py

@@ -6,18 +6,17 @@ from pydantic import BaseModel, Field
 import logging
 from google.genai.errors import ClientError, ServerError
 from rag.chain import aanswer
-from rag.retriever import get_retriever
 
+logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    """Pre-warm the retriever at startup so the first request is fast."""
-    logger.info("Pre-warming retriever (loading embeddings + FAISS index)...")
-    get_retriever()
-    logger.info("Retriever ready.")
+    """Lifespan handler — retriever initialises lazily on the first request."""
+    logger.info("=== FAQ RAG Chatbot starting up ===")
     yield
+    logger.info("=== FAQ RAG Chatbot shutting down ===")
 
 
 app = FastAPI(