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I'm not the person you're replying to, but does Postgres nowadays have a straightforward way to do tf-idf or BM25-style information retrieval?

Not op but not that I know of.

I commented below - I highly recommend Xapian for small projects to test the waters. It’s the SQLite if search.

Or you could use the FTS extension of SQLite. https://sqlite.org/fts3.html