video_downloads is a transient queue (hard-deleted on cleanup), so there was no record
of what SoulSync actually grabbed. Add a permanent video_download_history table +
capture: the monitor snapshots every terminal download (completed/import_failed/
cancelled/failed) into it, with rich metadata (title, year, S/E from search_ctx,
release, source, size, quality + parsed resolution/codec, dest path, poster, outcome,
timestamps). Idempotent per (download_id, outcome, dest_path).
DB methods: record_download_history, query_download_history (paged/kind/search),
download_history_detail, download_history_counts, latest_completed_download(media_type)
— the last is the probe target for the upcoming smart post-download scan. Schema v17.
