htang10/PersV ? reverse-engineered prompt

Build me a web app called PersV that lets people ask plain English questions about a relational database and get back clear, truthful answers without writing SQL.

I want a simple demo experience with no setup, plus the ability for a user to connect their own database later. Support common databases like PostgreSQL, MySQL, MariaDB, SQL Server, Oracle, and SQLite. The app should take a question, turn it into a safe read only SQL query, run it, and then explain the result in a human friendly way instead of showing raw rows only.

Use a modern React front end with a clean dashboard style and Tailwind for the UI. Build the backend in FastAPI with support for background processing, a database, and caching so the query flow feels responsive. Include account sign up for saving query history and past answers, and keep the demo database available for trying it right away. If you need to check current docs or best practices for any library, look them up online first.