def delete_all_notifications_by_kind(kind_name):
kind_ref = NotificationKind.get(name=kind_name)
(Notification.delete().where(Notification.kind == kind_ref).execute())
def delete_notifications_by_kind(target, kind_name):
kind_ref = NotificationKind.get(name=kind_name)
Notification.delete().where(Notification.target == target,
Notification.kind == kind_ref).execute()
def delete_all_notifications_by_path_prefix(prefix):
(Notification.delete().where(Notification.lookup_path**(prefix +
"%")).execute())