Automatically delete closed questions

feature-request
closed-questions
retag add tags

Today I had to close a question on my hosted site for the first time.

It will be good to keep it around for awhile so other users can see it as an example of an off-topic question and get a feel for what to do in cases like this (most of my users are new to the Q&A site concept).

However, after awhile, it will end up just adding noise to the site, so it would be nice if there were some parameters to automatically delete a closed question:

After a certain period of time.
After a certain number of downvotes?
After the question goes without any views (or less than a certain number of views) for a certain period of time?