Joomla's console fills $_SERVER['HTTP_HOST'] with the reserved sentinel
'joomla.invalid', which the [HOST] placeholder resolver used verbatim
because its unusable-host check only knew about empty/localhost. Treat
'joomla.invalid' as unusable too, falling back to live_site then the
system hostname, so CLI/console/scheduled backups get a real name.
Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i