FEATURE: store history for scheduled job execution

db/migrate/20160530003739_create_scheduler_stats.rb

@@ -0,0 +1,14 @@
+class CreateSchedulerStats < ActiveRecord::Migration
+  def change
+    create_table :scheduler_stats do |t|
+      t.string :name, null: false
+      t.string :hostname, null: false
+      t.integer :pid, null: false
+      t.integer :duration_ms
+      t.integer :live_slots_start
+      t.integer :live_slots_finish
+      t.datetime :started_at, null: false
+      t.boolean :success
+    end
+  end
+end