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Nothing reaped reels before, so the on-disk cache and ledger grew unbounded — each night's daily reel is a new ~4MB file + ledger row that's stale within ~26h. - Pre-gen self-prune: after recording a reel, prune_superseded keeps the newest PREGEN_KEEP_PER_SCOPE (2) rows per (span, library) and unlinks the superseded reels' mp4+sidecar. Caps the ledger/disk at ~spans×libraries×2. - On-disk sweeper (spawn_reel_cache_sweeper): every 24h, removes reel mp4s with no ledger row and no live job older than REEL_CACHE_MAX_AGE_DAYS (7) — bounding the on-demand cache, which has no ledger row and otherwise grows forever — plus crashed-render cruft (.mp4.tmp/.concat.txt/orphan sidecars). Runs regardless of REEL_PREGEN_ENABLED; disable with REEL_CACHE_SWEEP_ENABLED=0. - New DAO methods prune_superseded + all_cache_keys (with tests); env knobs documented in .env.example. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>