FIX revert system_notification_histories

db/migrate/20211012060837_create_system_notification_histories.rb

@@ -0,0 +1,10 @@
+class CreateSystemNotificationHistories < ActiveRecord::Migration[5.2]
+  def change
+    create_table :system_notification_histories do |t|
+      t.references :system_notification
+      t.references :user
+      
+      t.timestamps
+    end
+  end
+end