Found while triaging #1643 and #1637: both fields were stored via
system.json and accepted, validated, and echoed by the settings API,
but nothing ever consumed them. The unattended update schedule is owned
entirely by the systemd timer install.sh renders, and no UI control ever
set the fields, so the API persisted a schedule preference that could
never take effect.
Remove the fields from config.Config, SystemSettings, the settings
handlers, and the frontend config type, along with the interval
validation and the .env AUTO_UPDATE_CHECK_INTERVAL rewrite (a legacy
line is now preserved verbatim). Legacy clients that still send the
keys get them silently ignored instead of validated, and a system.json
written before the removal still loads cleanly - both behaviors are
pinned by new tests. User docs no longer describe the phantom schedule
settings.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
courtmanr@gmail.com