fixing bugs

app.py

@@ -163,7 +163,7 @@ async def rebuild_handler():
     return {"status": "success", "message": "Model and data rebuilt successfully"}
 
 @app.get("/recommend/network")
-async def get_recommendations_handler(user_id: int = Query(...)):
+async def get_recommendations_handler(user_id: str = Query(...)):
     if not trained_model:
         raise HTTPException(status_code=500, detail="Model not initialized, please rebuild first.")