The tradein-scraper container runs the same image as backend
(python -m app.scheduler_main, in-app scheduler) and owns the in-flight
scrape sweeps (a browser card takes ~15-27s). Two problems compounded to
kill running jobs on every deploy:
Phase 0 (deploy-tradein.yml): SCRAPER_CHANGED also fired on the `infra`
paths-filter (compose / workflow / deploy/**), so any generic infra edit
recreated the scraper container and SIGKILLed the running job. Dropped the
`|| infra == 'true'` term — only real scraper-code paths (already covered
by the `scraper` paths-filter) or a manual workflow_dispatch recreate it.
Phase 1 (docker-compose.prod.yml): the scraper had no stop_grace_period,
so Docker's default 10s window SIGKILLed an in-flight card (15-27s) before
it could finish. Added stop_grace_period: 120s + explicit stop_signal:
SIGTERM so a running unit can finish + checkpoint. The cooperative-drain
handler that consumes SIGTERM lands in a later phase; this is the
foundation.
