Is there a way to see when exactly a document was "shared" with someone else?
For example, John doesn't have access to see Document A. So Matt, who has access to the document, clicks "Share" on the document in the doc library, and invites John to view Document A. Several weeks later the document owner needs to know who shared the document with John, and when.
So, something similar to Version History, except it would show "Sharing History" or "Permissions History" or some-such.
For this scenario, we are using SharePoint 2013 On-Premise. I do have direct access to the DB if that matters.