Add an admin flow to permanently delete a media asset and clean up
everything it leaves behind.
- Delete dialog with a destructive, irreversible confirmation; deletion
is blocked while the video is still attached and shows the in-use
lessons so the admin can detach first.
- Usage list resolves lesson/course context for each attachment, links
to the lesson editor via an anchor (right-click "open in new tab"),
and exposes a refresh button to re-check usage after detaching
elsewhere.
- Storage cleanup runs as a background maintenance job: the producer
captures the asset's object keys/prefixes up front and an idempotent
worker sweeps HLS segments, thumbnails, audio, transcript, and the
raw upload from object storage.
Also harden usage accounting so stale attachments cannot trap an asset:
- asset_usages has no FK to its polymorphic target, so prune a lesson's
usage rows whenever the lesson is hard-deleted (single + bulk paths).
- Usage resolution drops orphaned lesson usages (lesson gone or course
soft-deleted) so they neither appear in the list nor block deletion.
Document the icon-only button convention (variant="secondary") in
AGENTS.md.
Rotimi Best
08ea608f94