feat(search): optional semantic embeddings with hybrid ranking (pgvector) - #295
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feat(search): optional semantic embeddings with hybrid ranking (pgvector)#295salmonumbrella wants to merge 2 commits into
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Results ranked by relevance instead of date-only: subject > sender > body (setweight A-D + ts_rank_cd), prefix matching as you type, quoted phrases, served by a GIN index over a trigger-maintained search_fts column. Backfill runs as a resumable background drainer (fast-DDL migrations 0035-0037, no boot-blocking rewrite); not-yet-backfilled rows fall back to the previous query path. Body text is materialized by a provider-gated background IMAP drainer with circuit breakers, poison-message forward progress, and progress reporting. Filter-only queries stay date-ordered. No infrastructure changes - runs on stock postgres:16-alpine. Split 1/3 of maathimself#283. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…tor) Explicit opt-in embeddings pipeline against any OpenAI-compatible /v1/embeddings endpoint (key encrypted at rest, host-validated, masked on read). Fingerprinted generations (config change => clean rebuild), a crash-safe fill worker, per-dimension HNSW partial indexes, re-embedding of late-arriving bodies. Query side adds hybrid BM25+ANN reciprocal-rank fusion behind an in-input Semantic toggle; lexical stays the default, with silent fallback while the index builds. Settings UI with explicit privacy copy and live Test/Build progress, in all 7 locales. Migrations 0038-0039. Includes the search-eval harness that produced the published quality numbers, and its explain/total diagnostics seams. Infra: compose moves postgres:16-alpine -> pgvector/pgvector:pg16 (same PG16 major). Run REINDEX DATABASE once after the first boot: the musl -> glibc collation change can misorder existing text btree indexes; the app logs a loud warning when it detects this. Split 2/3 of maathimself#283, stacked on the weighted-FTS PR. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This was referenced Jul 19, 2026
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Split 2/3 of #283, stacked on #294 — the diff shows #294's commit until it merges; review the last commit only (
feat(search): optional semantic embeddings with hybrid ranking (pgvector)). I'll rebase this onto main as soon as #294 lands. Everything costly or privacy-sensitive is off by default; stock Postgres still boots clean with semantic disabled.Summary
/v1/embeddingsendpoint (key encrypted at rest, host-validated, masked on read). Fingerprinted generations (config change ⇒ clean rebuild), a crash-safe fill worker, per-dimension HNSW partial indexes, re-embedding of late-arriving bodies. Migrations 0038–0039 (fast-DDL).backend/scripts/search-eval.mjs) that produced the quality numbers: on a real 18k-message mailbox, paraphrase Recall@20 goes 0% (current search) → 76% (hybrid); keyword MRR 0.43, best of all modes tested.Deployment notes
postgres:16-alpine→pgvector/pgvector:pg16(same PG16 major; the data dir mounts as-is). RunREINDEX DATABASEonce after the first boot: the musl → glibc collation change can misorder existing text btree indexes (the app logs a loud warning when it detects this).Testing
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