Create hook_nodeaccess_grants($uid, $nid).

Hi All!

In our current project we need to store a timestamp of a moment when user was provied with grants. For example, shop owner provided cliens with access to a product and he wants to know who visited a product's page, who should be notified again.

The module doesn't store such information. Therefore it could be great to use hooks system and provide developers with the way to run custom code when new grants are assigned to user(s) or role(s).