I know that there is a system for auto-deletion of certain closed and unanswered questions, as described by Shog9 in "Turbocharging the Roomba: solutions for premature deletion", but it was my understanding this only acted on closed questions.
This morning, this question was automatically deleted by the system as part of the automatic question removal script. It doesn't seem to fit the qualifications laid out by Shog9 in the above answer, as it was never closed, merely downvoted once.
Is there a bug in the auto-deletion routine? If so, have other downvoted but not closed questions been accidentally deleted in this manner?