deep-code-reviewer P0: mark_rate_limited() writes status='rate_limited' but
SQL CHECK constraint (015 + 051) only allows banned/done/failed/etc.
First blocking event would CheckViolation -> cascade through mark_failed ->
runs stuck in 'running' -> zombie cleanup. Frontend never shows badge.
Option B fix (no migration): rename mark_rate_limited -> mark_banned, use
existing 'banned' status (migration 015 doc'd as 'Avito вернул 403/captcha' -
exactly this scenario).
Plus:
- mark_failed + mark_banned now defensive db.rollback() at start (cascade-safe)
- All mark_* now RETURNING id + log warning when no rows updated (M3)
- Callers updated: scrape_pipeline.run_avito_city_sweep + test names
Refs PR #487 review (deep-code-reviewer, 2026-05-23).
36df5d92d2