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: create_crono_jobs.rb
    path of file: ./repos/crono/lib/generators/crono/install/templates/migrations
    
    the code of the file until where you have to start completion: class CreateCronoJobs < ActiveRecord::Migration[6.1]
  def change
    create_table :cron
    
  def change
    create_table :crono_jobs do |t|
      t.string    :job_id, null: false
      t.text      :log, limit: 1073741823 # LONGTEXT for MySQL
      t.datetime  :last_performed_at
      t.boolean   :healthy
      t.timestamps null: false
    end
    add_index :crono_jobs, [:job_id], unique: true
  end