Chaim
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Five enhancements to the precedent retrieval stack: * **#44 HNSW indexes** for precedent_chunks + halachot (replacing IVFFlat lists=50). Build time ~3s combined. Better recall@10 with pgvector 0.8.2. * **#45 Halacha sweep** — 96 pending halachot at conf>=0.78 promoted to approved (1141 → 1237). Cluster at conf=0.78 spot-checked OK. Applied via psql only — env HALACHA_AUTO_APPROVE_THRESHOLD unchanged (0.80). * **#43 MMR diversity** — search_precedent_library_hybrid now caps at ``max_per_case_law=2`` (default). Prevents one precedent dominating top-10 when many of its chunks/halachot rank high. New helper ``_diversify_by_case_law`` in hybrid_search.py. * **#46 Dynamic halacha boost** — replaces the static ``score+=0.05`` with ``score+=confidence*0.06``. Calibrated so avg-confidence (~0.85) stays at +0.05; high-conf halachot get a slight extra lift, low-conf ones get less. Behaviour preserved at the mean. * **#41 BM25/tsvector hybrid + RRF**. Schema V12 adds STORED tsvector columns ``precedent_chunks.content_tsv`` and ``halachot.rule_tsv`` (using simple config — Postgres has no Hebrew stemmer) + GIN indexes. New ``db.search_precedent_library_lexical`` mirrors the semantic function with ts_rank_cd over plainto_tsquery. ``hybrid_search`` runs sem+lex in parallel and fuses via RRF before rerank. Toggle: env ``BM25_HYBRID_ENABLED`` (default true), graceful fallback to semantic-only on lexical failure. #40 (VOYAGE_RERANK_ENABLED) was already true in Coolify env; no change. #42 (Claude Haiku query expansion) deferred — latency + cost concerns warrant a separate plan; the bm25 lexical leg already recovers most of the exact-string recall #42 was meant to address. Closes TaskMaster #41, #43-#46. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>