Add indication of relevancy to every site

[GeneralGeki]

A user has no idea wether the information on a given site is up to date.
Also it is very tedious for the content administrators to get this information. For example: I need 6 clicks to see when my Fachschaftlerpage was published and the version history is still lacking.

I propose a system, where every page has an attribute "last_relevancy_check" that not only informs the user about the relancy of the given information, but also reminds the responsible person for the site if a revisit is due. An appropiate interval for revisits would be at least every semester or every 6 months.

I bet that there's already a django (CMS) plugin for this.