Destroy NotificationRequests that are dismissed (#31008)

db/post_migrate/20240712064044_remove_dismissed_from_notification_requests.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class RemoveDismissedFromNotificationRequests < ActiveRecord::Migration[7.1]
+  def up
+    safety_assured do
+      execute 'DELETE FROM notification_requests WHERE dismissed'
+      remove_column :notification_requests, :dismissed
+    end
+  end
+
+  def down
+    add_column :notification_requests, :dismissed, :boolean, default: false, null: false
+  end
+end