feat(photos): separate object storage from metadata layer

Move physical file facts out of the photos table into an objects ledger:

- objects / photo_objects / variant_jobs tables (migration 000008)
- drop storage_key/thumb_key/preview_key/size/width/height/mime_type from
  photos (migration 000009); they are derived via joins to the original object
- album-free storage keys: objects/{id}/{role}.{ext}
- explicit GC via pending/ready/deleting states; objects deleted only when no
  photo references them
- background worker drives variant generation (durable variant_jobs) and GC
- copy/move are metadata-only; storage objects are shared between photos
- remove unused storage.DeletePrefix

Non-destructive to the external JSON API: size/dimensions/mime and URLs are
still returned, just sourced from the object layer.

OpenSpec change: media-object-layer

This commit is contained in:

2026-10-10 23:31:41 +03:00

parent 9effc0fc82

commit 96268ee16c

30 changed files with 1835 additions and 136 deletions

									
										backend/migrations/000008_media_objects.down.sql
									
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				DROP TABLE IF EXISTS variant_jobs;

				DROP TABLE IF EXISTS photo_objects;

				DROP TABLE IF EXISTS objects;