Undoing Deletion of Records
A record is not permanently deleted from the database until you save it. Before you save the record, which deletes it permanently, you can undo the deletion.
Note:  After 
 you save a record or a collection that has records marked for deletion, 
 you cannot undo the deletions. 
         To undo deletion of a record:
Notice that the deletion marker is no longer displayed in the row label.