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>
Three-layer separation: style learning (style_corpus), appeals-committee decisions
(internal_committee), and court rulings (external_upload).
- SCHEMA_V10: chair_name + district columns on case_law and cases, partial indexes
- create_internal_committee_decision() DB upsert function
- search_precedent_library_semantic() now accepts source_kind/district/chair_name params
- search_precedent_library_hybrid() passes through new params
- services/internal_decisions.py: ingest_internal_decision, migrate_from_style_corpus,
migrate_from_external_corpus (identifies rows via source_type='appeals_committee')
- search_internal_decisions() MCP tool (server.py + tools/search.py)
- internal_decision_migrate() MCP admin tool
- Web endpoints: POST /api/internal-decisions/upload, POST /api/internal-decisions/migrate,
GET /api/internal-decisions
- ingest_final_version auto-ingests finalized decisions into internal corpus
- SKILL.md updated: agents now search internal + external in parallel, present separately
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
`rerank.maybe_rerank` calls `base_search(limit=…, **base_kwargs)` on both
the rerank-on and rerank-off paths. Commit 242f668 moved the closure into
hybrid_search.py and renamed its parameter to `limit_inner`, so every call
to `/api/precedent-library/search` raised TypeError 500 regardless of the
VOYAGE_RERANK_ENABLED flag. Sibling `search_documents_hybrid` was unaffected
because it uses `lambda **kw:` which absorbs the kwarg.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Cosine scores in voyage-3 (~0.4-0.5) and voyage-multimodal-3
(~0.2-0.25) live on different scales. The previous weighted-sum
merge let text always dominate — verified empirically: 0 image-only
hits across 7 queries on case 8174-24, image side contributed nothing.
RRF combines by *rank* in each list rather than raw score, robust
to scale differences. Per-item score:
rrf_score = text_weight / (k + text_rank)
+ image_weight / (k + image_rank)
A row that appears in both lists (joined on (id_field, page_number))
gets both terms — surfaced as match_type='text+image'.
After fix on 8174-24 (146 image rows): 2 image-only hits land in
top-5 across all 7 test queries, surfacing actual table/diagram/
signature pages (p12, p13 of שומת המשיבה for 'טבלת השוואת ערכי שומה',
p25 of שומת השגה for 'תרשים גוש וחלקה', etc).
On 8137-24 (273 image rows): 'חישוב היוון של דמי החכירה' goes from
0 baseline results → 5 hybrid results (3 text + 2 image), opening
recall on scanned content the OCR layer misses.
Default MULTIMODAL_TEXT_WEIGHT 0.65 → 0.5 (vanilla RRF) since the
prior 0.65 was tuned for raw cosine scales that no longer apply.
New env knob MULTIMODAL_RRF_K (default 60, standard literature).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Stage C: per-page image embeddings via voyage-multimodal-3 + hybrid
text+image search. Off by default; enable with MULTIMODAL_ENABLED=true.
- Schema V9: document_image_embeddings + precedent_image_embeddings
(vector(1024), page_number, image_thumbnail_path)
- extractor.render_pages_for_multimodal renders PDF pages at
MULTIMODAL_DPI (144) for embedding + JPEG thumbnails at
MULTIMODAL_THUMB_DPI (96) for UI preview, in one pass
- embeddings.embed_images calls voyage-multimodal-3 in 50-page batches
- services/hybrid_search.py orchestrator: rerank applied to text side
first (rerank-2 is text-only); image side cosine; weighted merge
with text_weight 0.65 (env-tunable); image-only pages surface as
match_type='image' so dense scanned content still appears
- processor.process_document and precedent_library.ingest_precedent
gated by flag — non-fatal on multimodal failure
- scripts/multimodal_backfill.py — idempotent per-case CLI to embed
existing documents without re-extracting text
Validated locally on a 5-page response brief: render 0.31s, embed 8.32s,
hybrid merge surfaces image rows correctly. Production rollout starts
with flag=false (no behavior change), then per-case A/B.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
