managed_database_users rows (migration 050) track users/grants so they
survive restarts; SSO launches an on-demand Adminer container
pre-authenticated with a single-use, 5-minute shadow credential scoped
to one database, reaped on schedule. Also mounts the config tuner in
the explorer.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
