Fix UOW

Author: everysoftware

src/enterprise/unit_of_work.py

@@ -106,7 +106,6 @@ def commit(self) -> None:
 
     def rollback(self) -> None:
         self._source.rollback()
-        self._identity_map.clear()
         self._new.clear()
         self._dirty.clear()
         self._removed.clear()