Chaim
807053ec54
2026-05-31: opus-4-8 @ xhigh extraction + overlapping driver processes (agent fallback retries each spawn an independent `python -c` driver; process_pending is serial WITHIN a process but the box ran 4-5 drivers in parallel) → 12-16 concurrent xhigh `claude -p` procs → load 69 → hard reboot. Fix: halacha_extractor.extract() now takes a Postgres advisory lock (pg_try_advisory_lock, key 'HALA') before any work. If another extraction (any process/agent/driver — all share the legal-ai DB) holds it, the call returns status='busy' and the precedent stays pending for the next drain. Guarantees ONE extraction at a time ACROSS PROCESSES — an in-process Semaphore cannot (drivers are separate OS processes). Core logic moved to _extract_impl (unchanged) under the lock. CHUNK_CONCURRENCY now env-tunable (HALACHA_CHUNK_CONCURRENCY, default 3). Verified: while a lock is held, extract() returns 'busy' with no LLM call; lock releases cleanly and the next extraction proceeds. Tracks #72. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>