Added fifth tag category meta

db/migrate/20171106075030_add_tag_count_meta_to_posts.rb

@@ -0,0 +1,7 @@
+class AddTagCountMetaToPosts < ActiveRecord::Migration
+  def change
+    Post.without_timeout do
+      add_column :posts, :tag_count_meta, :integer, default: 0, null: false
+    end
+  end
+end