The duplicate scan walked the output tree and hashed every file on the
aiohttp event loop, and the duplicate delete removed files inline; the
output scan ran its per-file database work one executor hop at a time.
- _find_duplicate_images_sync / _describe_media_file do the walk and
hashing; find_duplicate_images() runs them via _run_in_executor.
- _delete_duplicate_images_sync / _delete_one_duplicate do the removal
(absolute or output-relative paths) off the loop.
- The output scan is split into _collect_output_media_sync,
_extract_batch_metadata_sync and _ingest_scan_batch_sync (one
executor call per batch for all DB work) with a small SSE generator.
- Media collection is shared and de-duplicates by normcase'd path.
Vito Sansevero
38f4c0af43