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: 20141120155629_devise_extend_push_type_users.rb
    path of file: ./repos/push_type/auth/db/migrate
    
    the code of the file until where you have to start completion: class DeviseExtendPushTypeUsers < ActiveRecord::Migration[4.2]
  def change
    ## Database authenticatable
    add_column :push_type_users, :encrypted_password,     :string, null: false, default: ""

    ## Recoverable
    add_column :push_type_users, :reset_password_token,   :string  
    add_column :push_type_users, :reset_password_sent_at, :datetime

    ## Rememberable
    add_column :push_ty
    
  def change
    ## Database authenticatable
    add_column :push_type_users, :encrypted_password,     :string, null: false, default: ""

    ## Recoverable
    add_column :push_type_users, :reset_password_token,   :string  
    add_column :push_type_users, :reset_password_sent_at, :datetime

    ## Rememberable
    add_column :push_type_users, :remember_created_at,    :datetime

    ## Trackable
    add_column :push_type_users, :sign_in_count,          :integer, default: 0, null: false
    add_column :push_type_users, :current_sign_in_at,     :datetime
    add_column :push_type_users, :last_sign_in_at,        :datetime
    add_column :push_type_users, :current_sign_in_ip,     :string
    add_column :push_type_users, :last_sign_in_ip,        :string

    ## Confirmable
    add_column :push_type_users, :confirmation_token,     :string
    add_column :push_type_users, :confirmed_at,           :datetime
    add_column :push_type_users, :confirmation_sent_at,   :datetime
    # add_column :push_type_users, :unconfirmed_email,      :string # Only if using reconfirmable

    ## Lockable
    # add_column :push_type_users, :failed_attempts,        :integer, default: 0, null: false # Only if lock strategy is :failed_attempts
    # add_column :push_type_users, :unlock_token,           :string # Only if unlock strategy is :email or :both
    # add_column :push_type_users, :locked_at,              :datetime

    add_index :push_type_users, :email,                unique: true
    add_index :push_type_users, :reset_password_token, unique: true
    # add_index :push_type_users, :confirmation_token,   unique: true
    # add_index :push_type_users, :unlock_token,         unique: true
  end