If you delete a row, and it therefore is marked as tombstone, and subsequently you try to insert the row again it appears to succeed, but if you try to request the row you don't get a result.
If you try to insert a row that has been recently deleted, and has an active tombstone I would expect either the tombstone marker to be removed, or the insert to fail. It seems to currently accept the insert and then subsequently the row can't be found.
