feat(metadocs): single-run flock — nightly job and manual backfill must not race - #30
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…st not race Per-session runs are hours-long during a backfill, so the 21:00 launchd job overlapping a manual run stopped being hypothetical: two runs would race over watermarks and the git repo. flock rather than a pid file — the lock dies with the process, a crash never wedges the nightly job. The yielding run exits 0: the overlap is expected and the other run is doing its work. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Per-session runs are hours-long during a backfill, so the 21:00 launchd job
overlapping a manual run stopped being hypothetical: two runs would race
over watermarks and the git repo. flock rather than a pid file — the lock
dies with the process, a crash never wedges the nightly job. The yielding
run exits 0: the overlap is expected and the other run is doing its work.
Co-Authored-By: Claude Opus 5 noreply@anthropic.com