Deleted sync icon

When I first started my main database I deleted the sync icon (as well as the smart groups) in the main column in an attempt to reduce the number of icons in amongst my group folders. I’ve recently purchased DTTG and I’m looking to sync with my iphone. Is there any way to get the sync icon and smart groups back or should I just copy my files into a new, fresh, database?

In general it should be impossible to delete the Sync group. But, however it happened, the easiest way to solve the problem is to create a new database and copy your documents over to the new one.