Enable content expiry

Hello,

I think it would be useful to expire a page or a page family. Expiration means that the content on the page is only valid up to a certain date.

I have seen discussions on this topic but am not sure if a formal enhancement request has been made.

The use cases would be:
1. User creates a page and defines an expiration date
2. When the expiration date is reached, the creator of the page and the Space Admins are notified that the page has reached expiration
3. The creator and Space Admins can then extend the expiration or commit it to an expired pool, in which case the page moves to a section in the Admin area of all expired content (can be viewed but not edited) and can be optionally purged.

Also, existing pages can be tagged for expiry.