feat(tradein): in-app scheduler — UI-managed schedule (replaces SSH crontab)
Background scheduler в FastAPI lifespan: each tick (60s) checks scrape_schedules
table, triggers city sweep run если due (next_run_at <= NOW() + enabled + no
running run), recomputes next_run_at для следующих суток в random время в окне.
- 052_scrape_schedules.sql: NEW table (source, enabled, window_start/end_hour UTC,
default_params jsonb, last_run_id, last_run_at, next_run_at, updated_at).
Seed: 'avito_city_sweep' enabled, window 2-5 UTC (05:00-08:00 МСК).
- scheduler.py NEW:
* compute_next_run_at(start, end) — random datetime в окне для +1 day. Cross-midnight OK.
* scheduler_loop() — tick каждые 60s
* get_due_schedules / has_running_run / trigger_avito_city_sweep_run
* reap_zombies() — runs running > 6h без heartbeat → status='zombie'
- main.py: FastAPI lifespan launches scheduler_task; clean shutdown через cancel
- admin.py: 2 endpoints
* GET /admin/scrape/schedules — list all (now single row, extensible)
* PUT /admin/scrape/schedules/{source} — update config (enabled, window, params)
+ auto-recompute next_run_at
- schemas/trade_in.py: ScheduleConfig + ScheduleConfigUpdate
- tests/test_scheduler.py: 6 offline tests (normal window, cross-midnight, 1h window,
future check, timezone-aware check)
UI: frontend PR добавит секцию 6 на /scrapers/avito (parallel PR).
Cron-script deploy/avito-city-sweep.sh остаётся как backup, opt-in.
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