I'm working on a proposal to rip out the existing PostgreSQL ILIKE/fuzzy_search based search in Lemmy (the federated Reddit clone) and replace it with Tantivy, a Rust full-text search library. The current implementation is basically WHERE title ILIKE '%query%' which obviously doesn't scale and has zero relevance ranking. The proposal adds BM25 scoring, phrase queries, boolean operators, field-specific searches (author:name), tag filtering, and date ranges - all while keeping the existing API endpoint unchanged. I'd need to maintain a separate Tantivy index on disk, hook into all CRUD operations to keep it in sync, and build a query parser that translates user input into Tantivy's query language. The alternative is just sticking with PostgreSQL's built-in full-text search (tsvector/tsquery) which would be way less work to implement but wouldn't give us the same level of advanced querying. Is rolling our own search index with Tantivy worth the complexity, or should we just use what Postgres already provides and call it a day?