Quick scan walks /import and enqueues
new files only.
Deep scan additionally re-walks already-imported
files so updated sidecar metadata (post title/date/attribution) and
previously-NULL phashes / artist links get refreshed. Use after
bulk-downloading fresh sidecars for existing content. Both modes
route non-media + sidecar pairs through PostAttachment capture.
An active batch is in progress. Wait for it to finish, or click
Clear stuck above if it has been wedged with no
measurable progress.