How to Know When a System User's Active Property Is Changed Manually?

Whether or not a System User is Active can be read from System administration object.  However, when the state of Active is changed in System Users, no Signal is caught using Record Modified if the Active flag was changed manually in System Users.  The Signal only triggers a process if the Active status is changed by another process.

How can a process be started when changing the Active status of a System User manually?