Pre-open error sweep (all verified by manual run):
- promote_candidates.py: INSERT OR IGNORE + only newly-added stocks count
toward promotion/XMPP (was crashing on first duplicate, never finishing;
now completes 40s, promoted 74 with correct skip marking)
- candidate_filter.py: PRAGMA busy_timeout=30s (was dying on transient
'database is locked' under concurrent cron writes; now completes 9.6s)
- price_monitor.py: verified completes 1m55s (< 120s cron timeout) with
working LLM reassess via key6
- macro_context_collector.py / divergence_detector.py: previously
'Blocked' by symlink check, now run fine (8.7s / 1m55s)
- memory_guardian.py: completes 1m55s with key6
- preflight sync diff: historical, files now identical
Production proof: 大脑任务执行 (was 429 every 10min) now status=ok at 01:21
