vadshan30/DataDoctor ? reverse-engineered prompt

Build me the first working version of DataDoctor as the backend for an AI powered data science platform.

I want a clean FastAPI app that starts up locally, loads settings from an .env file, connects to PostgreSQL, and includes SQLAlchemy models and JWT based login security. Please make sure there is a simple health endpoint I can hit to confirm everything is running, and that the API docs show up properly in the browser.

Keep it set up in a way that is easy to expand later for dataset profiling, data quality checks, EDA, preprocessing, model training, explainable AI, and insight generation. If anything in the setup depends on current library best practices, feel free to look up the latest docs online.

Also include the basic project wiring so I can run it locally with the backend folder, install dependencies, copy the example env file, and start the server without much fuss.