Log edits without showing username/timestamp

This is something I'm still struggling to understand.

So are you suggesting doing something like adding a checkbox field as a flag to the ShotID to indicate that it has been recorded to the Reshoot table already? And then use that to make sure that any subsequent edit of the ShotID is handled differently than the first?

Note that an action can edit the record that triggered the Action. Ie the shot id table.

I'm interested in this but I don't see how I can edit a record within the same table using an Action.