Replace the silent hard-delete orphan cleanup (which logged only through
ScannerLogger file logs and whose failure paths left rows undetected)
with an archive lifecycle that preserves reading history:
- A file missing in one scan is marked (missing_scan_count = 1); missing
in a second consecutive scan archives it (archived_at, hidden from
browsing, progress/notes/highlights survive). Every branch logs to
stdout with an [ARCHIVE] prefix so skips are always visible.
- When a file reappears - same path, or identical content at a new path
via the SHA-256 dedup match - the archived state clears automatically
and the item returns with its history intact.
- Archived rows older than ARCHIVE_RETENTION_DAYS are hard-purged at
scan time (cascading deletes); 0 disables auto-purge for manual-only
management. Retention is read from the environment in NewMediaScanner.
John O'Keefe
14445a7c3f