In a Rails app, Active Record creates created_at and updated_at columns thank to macros, (it seems to be also called "magic columns").

See Active Record Migrations

I have some questions about that mecanism:

• Is it possible to override that to get a third column (e.g. deleted_at) ?
• Is it possible to create a new macro t.publishing that will create publish_up and publish_down columns, for example?
• And where to code that?

Obviously, I know I can add those columns manually, but I wonder how to achieve it with macros.

Working on Rails 4.