class CreateDelayedJobs < ActiveRecord::Migration
  def change
    create_table :delayed_jobs, :force => true do |table|
      # Allows some jobs to jump to the front of the queue
      table.integer  :priority, :default => 0
      # Provides for retries, but still fail eventually.
      table.integer  :attempts, :default => 0
      # YAML-encoded string of the object that will do work
      table.text     :handler
      # reason for last failure (See Note below)
      table.text     :last_error
      # When to run. Could be Time.zone.now for immediately,
      # or sometime in the future.
      table.datetime :run_at
      # Set when a client is working on this object
      table.datetime :locked_at
      # Set when all retries have failed
      # (actually, by default, the record is deleted instead)
      table.datetime :failed_at
      # Who is working on this object (if locked)
      table.string   :locked_by
      # The name of the queue this job is in
      table.string   :queue
      table.timestamps
    end

    add_index(
      :delayed_jobs, [:priority, :run_at], :name => 'delayed_jobs_priority'
    )
  end
end
