Halacha extraction held ALL chunk results in memory and stored once at the very
end — a crash/interrupt mid-run (e.g. the 2026-05-31 freeze) lost everything and
re-paid the full LLM cost on retry.
Now each chunk's halachot are stored AND the chunk is checkpointed
(precedent_chunks.halacha_extracted_at) the moment it finishes:
- V25 schema: precedent_chunks.halacha_extracted_at (per-chunk checkpoint).
- db.store_halachot_for_chunk: atomic per-chunk insert (halacha_index continues
from MAX, caller serializes via an in-process store-lock) + checkpoint mark.
- db.reset_halacha_extraction (force) / mark_all_chunks_extracted (legacy backfill).
- _extract_impl rewritten: resume by default (skip checkpointed chunks; failed
chunks stay pending and are retried; status stays 'processing' until all done);
force=True wipes + redoes all. reextract_halachot passes force=True; the queue
drain (process_pending) resumes by default.
- Legacy guard: a pre-V25 precedent (halachot exist, no checkpoints) is
backfilled and treated as complete — never re-extracted (would duplicate).
Verified on 9002-24 (55 halachot, legacy): resume → legacy-backfill, NO
duplication (stays 55), all chunks checkpointed. Index continuation: store at
55,56 after max 54, no collision. Tracks #72.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
