Move CronoJob to models dir

app/models/crono/application_record.rb

@@ -0,0 +1,5 @@
+module Crono
+  class ApplicationRecord < ActiveRecord::Base
+    self.abstract_class = true
+  end
+end

app/models/crono/crono_job.rb

@@ -0,0 +1,11 @@
+module Crono
+  # Crono::CronoJob is a ActiveRecord model to store job state
+  class CronoJob < ActiveRecord::Base
+    self.table_name = 'crono_jobs'
+    validates :job_id, presence: true, uniqueness: true
+
+    def self.outdated
+      self
+    end
+  end
+end