ADD db schema in models

app/models/praise_tread_cache.rb

@@ -1,2 +1,15 @@
+# == Schema Information
+#
+# Table name: praise_tread_caches
+#
+#  id          :integer          not null, primary key
+#  object_id   :integer          not null
+#  object_type :string(255)
+#  praise_num  :integer
+#  tread_num   :integer
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#
+
 class PraiseTreadCache < ApplicationRecord
 end