fix: update to ddgs package and use FastAPI lifespan events

- Replace deprecated duckduckgo-search with ddgs package
- Replace deprecated @app .on_event with lifespan context manager
- Fixes deprecation warnings in HF Spaces deployment

requirements.txt

@@ -22,5 +22,5 @@ passlib[bcrypt]>=1.7.4
 python-multipart>=0.0.9
 httpx>=0.27.0
 aiohttp>=3.9.0
-duckduckgo-search>=6.0.0  # Live search for hybrid RAG
+ddgs>=1.0.0  # Live search for hybrid RAG (renamed from duckduckgo-search)
 python-dateutil>=2.8.2    # Date parsing for live results

src/infrastructure/adapters/duckduckgo_adapter.py

@@ -21,11 +21,16 @@ import traceback
 logger = logging.getLogger(__name__)
 
 try:
-    from duckduckgo_search import DDGS
+    from ddgs import DDGS
     HAS_DDGS = True
 except ImportError:
-    HAS_DDGS = False
-    logger.warning("duckduckgo-search not installed. Live search disabled.")
+    # Fallback to old package name for backward compatibility
+    try:
+        from duckduckgo_search import DDGS
+        HAS_DDGS = True
+    except ImportError:
+        HAS_DDGS = False
+        logger.warning("ddgs (duckduckgo-search) not installed. Live search disabled.")
 
 
 class DuckDuckGoAdapter:

src/main.py

@@ -1,6 +1,7 @@
 import os
 import sys
 from pathlib import Path
+from contextlib import asynccontextmanager
 
 # Add project root and local src to path to allow direct execution
 current_dir = Path(__file__).resolve().parent
@@ -17,9 +18,24 @@ from src.api.dependencies import prewarm_models
 import threading
 import uvicorn
 
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Startup
+    init_db()
+    # Pre-warming moved to lazy loading or manual script to prevent 
+    # initialization timeouts/crashes on the first run.
+    # thread = threading.Thread(target=prewarm_models)
+    # thread.start()
+    yield
+    # Shutdown (if needed)
+    pass
+
+
 app = FastAPI(
     title=settings.PROJECT_NAME,
-    openapi_url=f"{settings.API_V1_STR}/openapi.json"
+    openapi_url=f"{settings.API_V1_STR}/openapi.json",
+    lifespan=lifespan
 )
 
 # Set all CORS enabled origins
@@ -31,14 +47,6 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-@app.on_event("startup")
-def on_startup():
-    init_db()
-    # Pre-warming moved to lazy loading or manual script to prevent 
-    # initialization timeouts/crashes on the first run.
-    # thread = threading.Thread(target=prewarm_models)
-    # thread.start()
-
 app.include_router(rag.router, prefix=f"{settings.API_V1_STR}/rag", tags=["RAG"])
 app.include_router(analytics.router, prefix=f"{settings.API_V1_STR}/analytics", tags=["Analytics"])
 app.include_router(interactions.router, prefix=f"{settings.API_V1_STR}/interactions", tags=["Interactions"])