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- BACKFILL_TIMEOUT_SECONDS 1800→1170: keep the subprocess timeout 30s below Celery's hard time_limit=1200 so SIGKILL doesn't beat TimeoutExpired (matched the tick 870s/900s rationale). Backfill runs that hit the cap let the next tick continue via the archive. - recover_interrupted_tasks orphan UPDATE now stamps finished_at; without it cleanup_old_tasks' WHERE finished_at<cutoff never reaped orphan-swept rows. recover_stalled_task_runs also now sets duration_ms (matches celery_signals.finalize's millisecond math). - ExtensionService.quick_add_source arms NEW_SOURCE_BACKFILL_RUNS=3 on Source creation, mirroring SourceService.create. Without it, Firefox quick-add on a creator with >20 unsynced posts walked the full feed until subprocess timeout. Renamed the constant from _NEW_SOURCE_BACKFILL_RUNS so it can be imported cross-module. - gallery_dl.verify() accepts TIER_LIMITED as auth-success alongside NO_NEW_CONTENT — the download path (line 712) already does, and TIER_LIMITED proves auth reached the post and was told it was tier-gated. Verify endpoint previously showed red on this and prompted operators to rotate working cookies. - prune_unused_tags now runs a single DELETE with the NOT-IN predicate find_unused_tags uses, instead of SELECT-ids → DELETE-WHERE-IN. Removes the psycopg 65535-param cliff that would have surfaced on a tag explosion (>65k unused tags). - credentials.upload() reflects the returned record into the store cache (`.set(platform, rec)`) instead of evicting it; previously the card briefly rendered "no credential" between upload and loadAll().