perf: bound classic BM25 candidates with Postgres FTS - #252
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Classic path/content channels loaded the full scoped corpus into Python before BM25. Prefetch via simple FTS (server-side OR tsquery), apply section exclusions before the candidate LIMIT, and fall back to a full scan when FTS matches nothing so recall does not regress. Combines the approaches from #244 and #251; closes #195. Co-authored-by: Ray Tien <ray.tien0907@gmail.com> Co-authored-by: nuemaan <anonnumaan@gmail.com> Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced Aug 11, 2026
EricNGOntos
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Aug 11, 2026
Keep map-nav default retrieval docs; retain BM25 FTS candidate limit note. Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced Aug 13, 2026
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Summary
path/contentBM25 channels now prefilter with PostgressimpleFTS (bounded byRETRIEVAL_POSTGRES_FTS_CANDIDATE_LIMIT, default 2000), then keep Python BM25 as the final channel ranker.exclude_sectionsbeforeLIMIT,.env.example, channel unit coverage) and #251 (server-side OR tsquery fromtext[], full-scan fallback to preserve recall, real Postgres contract tests).use_agentic=false).Co-authored-by.Test plan
uv run pytest apps/api/tests/unit/test_bm25_channel_tsquery.py packages/shared-python/shared/tests/test_retrieval_search_channels.py -quv run pytest apps/api/tests/contract/test_bm25_fts_prefilter_contract.py -quse_agentic=false) on a larger namespace if availableMade with Cursor