Tanvir0072309/kharch-expense-tracker ? reverse-engineered prompt

Build me a mobile expense tracker called Kharch that helps people sign up, log in, add, edit, delete, and review expenses, with categories, budgets, a dashboard summary, and a profile area.

I want the app to feel polished and practical on a phone, with a React Native and Expo client talking to a Node and Express backend over REST, and PostgreSQL for the data. Please set it up so the backend stays clean and modular, with validation, auth, error handling, and a proper flow from routes to services to the database.

Use Docker for the local environment, and make sure the app is ready to grow later into a more production style setup with Redis caching and multiple API instances behind a reverse proxy if needed. If anything is unclear, make sensible choices and look up current docs online if you need to.