I just discovered the Import Contacts command 
I have now imported all of my contacts as links. Does DevonThink ever resync with the contacts database on its own?
I tried doing another import to the same folder hoping that it would only import changes (additions, corrections, deletions, etc.) but it just doubled everything. So i moved them all to trash and re-imported.
No, this is just an import.
And if I periodically do a new import each card will get a new uuid so I cant actually use links to the contacts. Right?
Not right. Or rather: That depends on what UUID you’re talking about.
If you import the contacts as bookmarks/links, the UUID in the bookmark is always the same. The UUID of the DT records, though, have to be different. But the important thing, I guess, is that the contact’s UUID does not change.
So you could remove all contacts from DT and then import them anew to get a very poor man’s sync.
So I can’t use the DT Get Item Link as a persistent link but I can use the address book link in the url field. Am I interpreting you correctly?
I guess so.
I will experiment Thank you.