class Deletion
  def execute
    user.logout

    user.after_destroy_hook do
      self.executed_at = Time.now
      save_changes(:validate => false)
    end
    user.destroy
  end
end

class User
  def before_destroy
    self.inbox = nil # so foreign_key doesnt complain when mailboxes are destroyed
    save_changes(:validate => false)
    super
  end
end