Assume I want to re-authorized one of the un-authorized members inside of the DNN (Current V. 5.4); In DNN website, does it have particular timestamp to be record for this purpose only?

I do know we have

Users.LastModifiedOnDate column to show the update date but this column is shared for all other purposes. As a result, this column won't be able to help me. 

Basically, I want to get time stamp for user who want to re-authorize someone. Or if DNN does not have this to be recorded inside of the database, can you show me which store procedure is executed when 

Authorize User is on Admin.UserAccounts webpage?

I may need to add sql statement to capture the record. If you have better ideas and routes, please let me know