canvas-lms/db/migrate/20110801080015_message_forwards.rb

class MessageForwards < ActiveRecord::Migration[4.2]
  tag :predeploy

  def self.up
    add_column :conversation_messages, :forwarded_message_ids, :text
  end

  def self.down
    remove_column :conversation_messages, :forwarded_message_ids
  end
end