We don't delete expired auths, but, instead, only delete them when one of the two named empires are deleted. This means that if your sole sitter gets deleted, it won't be counted. Then, the empire cleanup code will look if there are any sitter auths that expired recently, or have not yet expired. If so, we just skip that empire altogether, it won't get cleaned up. This should extend an empire out to 20 days after the last sitter expires, or 20 days after its last login, whichever comes _later_. And then the regular essentia drain kicks in. While we'd like to change that as well, that change is not part of this update.