Deleted someone you actually want to keep in your list of Contacts? Here's how to fix it:
Navigate to the Contacts menu. On the top of the Contact List, next to the Search box, open the Filter option.
Toggle Active to Inactive. This will display any contacts you have marked for deletion. Select the contact you want to keep in Traktivity,
On the Contact Card that opens on the right side, you'll see a checkbox in the top-right corner. Click this checkbox to enable the Contact and move him or her back into your Active Contact List.