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Build the index as a static file and query it using js? This has been my approach so far — admittedly, this isn't with millions of pages, but I'll continue to use it for as long as it works. When hosted on the internet, the search is still blazingly fast, way better than most other sites I come across.

For a very similar scenario I'm currently looking to use PGlite: https://pglite.dev/ which is a 3MB WASM build of Postgres which also includes pgvector.

stuff like https://lunrjs.com/ works

Can it index images by semantic, that is what vector search can do