- Add PG trigger trg_files_decrement_blob_ref (AFTER DELETE ON storage.files)
that auto-decrements storage.blobs.ref_count for every deleted file row.
Covers all paths: explicit DELETE, ON DELETE CASCADE, trash emptying.
- Remove manual remove_reference() call from delete_file() in
file_blob_write_repository — trigger is now the single source of truth.
- Fix double-decrement bug in FileManagementService::delete_with_cleanup:
was decrementing ref_count on trash (soft-delete) when the file row still
existed, causing premature blob GC and potential data corruption on restore.
- Remove dead fields (file_read, dedup_service) from FileManagementService
and simplify constructors — ref_count fully handled by PG trigger.
Diocrafts