Currently there is no webhook to receive a notification when a note has been deleted, and you are correct there is also no permission set to prevent notes from being deleted.
Within the API, if you request to view a specific note engagement and it's been deleted you will receive an HTTP 404 error.
Currently there is no webhook to receive a notification when a note has been deleted, and you are correct there is also no permission set to prevent notes from being deleted.
Within the API, if you request to view a specific note engagement and it's been deleted you will receive an HTTP 404 error.