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: 20210428112249_add_token_id_to_event_subscriptions.rb
    path of file: ./repos/open-build-service/src/api/db/migrate
    
    the code of the file until where you have to start completion: class AddToke
    
  def change
    safety_assured do # since strong_migrations cannot look inside the block of change_table
      change_table :event_subscriptions, bulk: true do |t|
        t.integer :token_id
        t.index :token_id
      end
    end
  end