You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20140612010718_move_profile_background_to_user_profiles.rb
    path of file: ./repos/discourse/db/migrate
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class MoveProfileBackgroundToUserProfiles < A
    
  def down
    add_column :users, :profile_background, :string, limit: 255

    execute "UPDATE users SET profile_background = (SELECT profile_background FROM user_profiles WHERE user_profiles.user_id = users.id)"

    remove_column :user_profiles, :profile_background
  end