dhruvsinghal09/Agentic-BFF ? reverse-engineered prompt

Build me a small Rust backend service that can sit behind a frontend app and manage users. It should use the existing users.db file for simple persistence, expose a few basic HTTP endpoints for creating, listing, updating, and deleting users, and return clean JSON responses. I’d also like a simple health check route and sensible error handling so it feels like a real app, not a toy.

Please make the project easy to run locally with one command, and keep the code organized and readable since I may want to extend it later. If you need to look up current Rust docs or best practices for the web server setup, feel free to do that. After building it, make sure it compiles and the basic user flows work end to end.