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: 20150826182010_refactor_verification_columns.rb
    path of file: ./repos/consuldemocracy/db/migrate
    
    the code of the file until where you have to start completion: class Refacto
    
  def change
    rename_column :users, :sms_verification_code, :sms_confirmation_code

    remove_column :users, :sms_verified_at, :datetime
    remove_column :users, :email_verified_at, :datetime
    remove_column :users, :email_for_verification, :string
    remove_column :users, :verified_user_sms_verified_at, :datetime
    add_column :users, :verified_at, :datetime

    remove_column :users, :phone, :string
    add_column :users, :unconfirmed_phone, :string
    add_column :users, :confirmed_phone, :string

    remove_column :users, :letter_requested, :boolean, default: false
    add_column :users, :letter_requested_at, :datetime

    rename_column :users, :sms_tries, :sms_confirmation_tries
  end