Summary: Ref T2769. I'm planning to keep this pretty simple, but we have this ad-hoc edit log for rules already and some other mess that we can clean up.
Test Plan: No effect yet; see future changes.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2769
Differential Revision: https://secure.phabricator.com/D6654
