Added 'Seedable' concern to (re-)seed models based on their seed files in /db/seeds .

app/models/concerns/seedable.rb

@@ -0,0 +1,23 @@
+# Copyright (C) 2012-2016 Zammad Foundation, http://zammad-foundation.org/
+module Seedable
+  extend ActiveSupport::Concern
+
+  # methods defined here are going to extend the class, not the instance of it
+  class_methods do
+
+    def reseed
+      destroy_all
+      seed
+    end
+
+    def seed
+      UserInfo.ensure_current_user_id do
+        load seedfile
+      end
+    end
+
+    def seedfile
+      "#{Rails.root}/db/seeds/#{name.pluralize.underscore}.rb"
+    end
+  end
+end

app/models/overview.rb

@@ -3,6 +3,7 @@
 class Overview < ApplicationModel
   include NotifiesClients
   include LatestChangeObserved
+  include Seedable
 
   load 'overview/assets.rb'
   include Overview::Assets