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: 035_add_facebook_user_and_relations.rb
    path of file: ./repos/alonetone/db/migrate
    
    the code of the file until where you have to start completion: class AddFacebookUserAndRelations < A
    
  def self.up
    # out with the old
    remove_column :users, :fb_user_id
    
    # users can have a facebook account
    add_column :users, :facebook_account_id, :integer
    
    create_table :facebook_accounts do |t|
        t.integer :fb_user_id
    end


    # bigints for mysql
    execute("alter table facebook_accounts modify fb_user_id bigint")
    
    add_index :users, :facebook_account_id
    add_index :facebook_accounts, :fb_user_id
  end