#414

backend/app/models/event.rb

@@ -0,0 +1,9 @@
+class Event < ApplicationRecord
+  has_many :post_versions
+  has_many :tag_versions
+  has_many :material_versions
+  has_many :tag_description_versions
+  has_many :tag_group_versions
+
+  belongs_to :created_by_user, class_name: 'User', optional: true
+end