- Migration 0053: download_task.media_entity_id (FK, set null on delete),
backfilled from plan slot / source release / latest organize record.
- Submitted and adopted tasks carry the entity; entity merge follows it.
- GET /library/{id}: downloads also matched by dt.media_entity_id (adopted
takeover tasks), plus organizationRecords (incl. manual path organizes);
library list / inventory counts use it too.
- Web detail: "接管" marker and a list of records without a download task.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
