https://github.com/Amogh0108/bluestock-finetech.git this is the frontend part of my project ,which few of my team mates are completed now i want to complete the backend part, the API endpoints are in the following Authentication Endpoints POST /api/auth/register - Register a new user POST /api/auth/login - Login and get authentication token GET /api/auth/user - Get current user information POST /api/auth/logout - Logout user Stock Endpoints GET /api/stocks - Get list of all stocks GET /api/stocks/:symbol - Get data for a specific stock GET /api/stocks/search/:query - Search for stocks GET /api/stocks/:symbol/history - Get historical data GET /api/stocks/trending - Get trending stocks Portfolio Endpoints GET /api/portfolio - Get user's portfolio POST /api/portfolio/add - Add stock to portfolio DELETE /api/portfolio/:stockId - Remove stock from portfolio PUT /api/portfolio/:stockId - Update stock details in portfolio GET /api/portfolio/performance - Get portfolio performance User Endpoints PUT /api/users/profile - Update user profile GET /api/users/watchlist - Get user's watchlist POST /api/users/watchlist/add - Add stock to watchlist DELETE /api/users/watchlist/:stockId - Remove stock from watchlist Now one of my team mate asked the question that is in the following: just a quick question.... for the endpoints you have mentioned under stock... are we supposed to create our own data model(for ppl to post their company and other stock related details) or should we use a pre existing API to fetch day to day stock market data? Help me out to ask him and i want only free platform not paid .Accordingly provide me ans to answer him