Enforce GUID being present for notifications

db/migrate/20201130142541_change_notifications_guid_not_null.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class ChangeNotificationsGuidNotNull < ActiveRecord::Migration[5.2]
+  def up
+    Notification.where(guid: nil).find_in_batches do |batch|
+      batch.each do |notification|
+        notification.save!(validate: false, touch: false)
+      end
+    end
+
+    change_column :notifications, :guid, :string, null: false
+  end
+
+  def down
+    change_column :notifications, :guid, :string, null: true
+  end
+end