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: 20110616080444_add_look_up_key_id_to_puppet_class.rb
    path of file: ./repos/foreman/db/migrate
    
    the code of the file until where you have to start completion: class AddLookUpKeyIdToPuppetClass < ActiveRecord
    
  def down
    remove_index :lookup_keys, :path
    remove_index :lookup_values, :match
    remove_column :lookup_keys, :puppetclass_id
    remove_column :lookup_keys, :path
    remove_column :lookup_keys, :description
    remove_column :lookup_keys, :validator_type
    remove_column :lookup_keys, :validator_rule
    rename_column :lookup_values, :match, :priority
  end