Global links checker
There is a feature in the links tool at the moment that allows the teacher to check one link at a time.
Given the possibility that some links might get hacked, it would be nice to have a basic info coming from the link to generate a global analyzer that informs the admin when a link has been changed. For example, we could store the last title seen on/parsed from this website, and indicate when this title has changed, as well as indicate if the link is dead.
This should take the form of a global screen for the admin showing the following information:
|Course||Session||Teacher||Link name||Last known content title||Current content title||Valid (yes/no)||Previous date checked|
Each element should be a link to the corresponding resource.
A big button at the top of the page would say "Check all links" and a button next to each link would allow to check only that link.
This implies a little database change to add 4 fields (past content title, past check date, last content title, last check date).