Back In Stock Notifications for WooCommerce

Need a way to delete all notifications. Currently the only way to delete notifications is 25 at a time. I have 3000 notifications, this will take a long time. I need to be able to do this when I copy my live site to my devsite. I don’t want notifications going out from my devsite. The plugin doesn’t clean up after itself when deleted. Have to manually clean out the db tables.