The crawl stalled when two crawler processes briefly overlapped on the same
WAL SQLite frontier (node:sqlite is synchronous, so a blocked write lock froze
the event loop). Fixes:
- run the crawler as a single-instance systemd service (search-crawler.service)
with CPUQuota=150% + MemoryMax=1200M so it can't starve a shared VM
- add timeouts to all Meilisearch calls + resilient flush (an untimed hang was
the amplifier that wedged every worker)
- crawl-diskguard.sh + cron: auto-stop the crawl and ntfy-alert if disk < 800MB
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
