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: 20210430023050_add_site_save_count.rb
    path of file: ./repos/tiddlyhost/rails/db/migrate
    
    the code of the file until where you have to start completion: class AddSiteSaveCount < ActiveRecord::Migration[6.1]
  def up
    add_column :sites, :save_count, :integer, default: 0

    # For existing sites we don't know their save c
    
  def up
    add_column :sites, :save_count, :integer, default: 0

    # For existing sites we don't know their save count, but
    # one is a much better guess than zero.
    Site.updated_at_least_once.update_all(save_count: 1)
  end

  def down
    remove_column :sites, :save_count
  end
end