adarsh0707-kumar/medical-billing ? reverse-engineered prompt

Build me a full medical billing web app for a retail pharmacy, with a clean React front end and a Node and Express backend, using PostgreSQL for data storage. It should let staff handle point of sale billing, manage medicine stock with batch and expiry tracking, keep customer and supplier records, and show daily sales plus GST reports.

I want login and user roles for admin, pharmacist, and cashier, with a simple seeded admin account to get started. Make sure the billing flow, stock updates, and tax calculations are reliable, since this is handling money and inventory. Please containerize it so I can run the whole thing with Docker and see it behind nginx, but also have a local dev setup that is easy to start.

If you need to check current docs or best practices while building it, go ahead and look them up.