What happens after the app is uninstalled?

When you uninstall the app, all price changes that you've made will stay. All your tasks and sales will be saved in the app for 2 months after uninstalling. During that time, you'll be able to reinstall the app and rollback any task or disable sales. 

After 2 months, all tasks and sales data will be permanently deleted and you won't be able to roll back any price changes.