canvas-lms/db/migrate/20130425230856_add_last_logged_out_to_users.rb

class AddLastLoggedOutToUsers < ActiveRecord::Migration
  tag :predeploy

  def self.up
    add_column :users, :last_logged_out, :timestamp
  end

  def self.down
    remove_column :users, :last_logged_out
  end
end