fix(): copy domain entities upon uow.add

src/template_project/application/common/entity.py

@@ -1,7 +1,7 @@
 from collections.abc import Hashable
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from datetime import datetime
-from typing import cast, dataclass_transform, override
+from typing import Self, cast, dataclass_transform, override
 from uuid import UUID
 
 from template_project.application.common.errors import EntityAlreadyDeletedError
@@ -22,6 +22,9 @@ class Entity[EntityId: UUID](Hashable):
         if self.deleted_at is not None:
             raise EntityAlreadyDeletedError(entity_name=self.__class__.__name__)
 
+    def __copy__(self) -> Self:
+        return replace(self)
+
     @override
     def __eq__(self, other: object) -> bool:
         if isinstance(other, Entity):