Add index to AR spec setup

spec/setup/active_record.rb

@@ -5,23 +5,23 @@
 ActiveRecord::Migration.verbose = false
 
 ActiveRecord::Schema.define do
-
   create_table :delayed_jobs, :force => true do |table|
     table.integer  :priority, :default => 0
     table.integer  :attempts, :default => 0
     table.text     :handler
-    table.string   :last_error
+    table.text     :last_error
     table.datetime :run_at
     table.datetime :locked_at
-    table.string   :locked_by
     table.datetime :failed_at
+    table.string   :locked_by
     table.timestamps
   end
 
+  add_index :delayed_jobs, [:priority, :run_at], :name => 'delayed_jobs_priority'
+
   create_table :stories, :force => true do |table|
     table.string :text
   end
-
 end
 
 # Purely useful for test cases...