Drops the created columns on users, subscriptions and sessions, which were
written by every insert and read by nothing, and migrate()'s add list, whose
columns all predate 0.3.0. Removes Db::subscribed_feed_ids (no callers),
Db::subscriber_count (one caller wanting > 0) and Managed.orphaned (never
read). The old-database test now builds the tables with foreign keys on.
Popular now lists the feeds inside an OPML or a Patreon creator, never the
collection, as Directory does.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TAC7sLVqfKmY6rsTLXzNgk