abramovd/yt-semantic-search ? reverse-engineered prompt

Build me a YouTube semantic search app that lets me search through video captions with plain English questions. I want to be able to load a set of YouTube videos, pull their captions, clean them up, split them into useful chunks, turn them into embeddings, and store them in a database so I can search them later by meaning instead of exact words.

Please include a simple web UI where I can type a query and see the best matching video clips with links and timestamps, plus a command line interface for populating the database, listing videos, adding new ones, and running searches. It should work with Docker for easy setup, and also run locally if I have Python and MariaDB installed. If you need to check current docs for any of the libraries, go ahead and look them up online.