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: 20201110114548_add_config_to_district.rb
    path of file: ./repos/weg-li/db/migrate/old
    
    the code of the file until where you have to start completion: class AddConfigToDistrict < ActiveRecord::Migration[6.1]
  def change

    
  def change
    add_column :districts, :config, :integer, default: 0
    reversible do |dir|
      dir.up do
        execute "UPDATE districts SET config = 1 WHERE email = 'bgst-verkehr2@dresden.de'"
        execute "UPDATE districts SET config = 2 WHERE email = 'verkehrsueberwachung.kvr@muenchen.de'"
      end
    end
  end