A feed whose body sniffs as OPML is treated as a subscription list and
re-read on every scan, as iPodderX did. Listed feeds become real config
entries grouped under it, inherit its settings, land in one nested folder,
and are scanned in the same run.
When a feed leaves the OPML: removed if nothing was downloaded, kept and
flagged otherwise, so a downloaded file is never orphaned.
folder_for sanitized the whole folder string and would have flattened the
nesting; each segment is sanitized separately now, and a traversal still
cannot escape the download directory. Db::memory() also runs migrate(),
which it did not, so a migration-only column passed tests while missing in
production.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AdXho5tTkjFLeUXKbEjKBh
rays
c86d698363
