I had a look at the activity and I have the following questions since there is no documentation that explains what it does:
1) I opened the activity, and on step 3 (Method RDB-Delete) there is a description that says "Delete recipients for notifications". What does this step do? From the comment it looks like it will delete the recipients of the notification, but we need to delete only the notifications, that seems to be executed on step 4 (description "Delete notifications").
2) There is parameter NumberOfDays for the activity, it will remove all notifications for all users for the last NumberOfDays? Or it removes only for the current logged user?
It would be helpful to have a documentation that explains what is does and how the activity is used.