fix: On discussion with Sergei, actually Should be UUID (#810)

encord/objects/ontology_labels_impl.py

@@ -17,6 +17,7 @@
 from dataclasses import dataclass, field
 from datetime import datetime
 from typing import Any, Dict, Iterable, List, Optional, Sequence, Set, Type, Union
+from uuid import UUID
 
 from encord.client import EncordClientProject
 from encord.client import LabelRow as OrmLabelRow
@@ -408,14 +409,14 @@ def audio_num_channels(self) -> Optional[int]:
         return self._label_row_read_only_data.audio_num_channels
 
     @property
-    def backing_item_uuid(self) -> Optional[str]:
+    def backing_item_uuid(self) -> Optional[UUID]:
         """
         Returns the unique identifier (UUID) for the backing storage item associated with this label row.
-        The backing item UUID represents the storage reference for the data linked to the row.
+
         While it is always included in server responses, it is marked as optional for backward compatibility with earlier versions.
 
         Returns:
-            Optional[str]: The backing storage item id or None if not found.
+            Optional[UUID]: The backing storage item id or None if not found.
         """
         # TODO: Mark required in 0.2 release
         return self._label_row_read_only_data.backing_item_uuid
@@ -1589,7 +1590,7 @@ class LabelRowReadOnlyData:
         last_edited_at: Optional[datetime]
         data_hash: str
         data_type: DataType
-        backing_item_uuid: Optional[str]
+        backing_item_uuid: Optional[UUID]
         label_status: LabelStatus
         annotation_task_status: Optional[AnnotationTaskStatus]
         workflow_graph_node: Optional[WorkflowGraphNode]

encord/orm/label_row.py

@@ -5,6 +5,7 @@
 from dataclasses import asdict, dataclass
 from enum import Enum
 from typing import Any, Dict, List, Optional
+from uuid import UUID
 
 from pydantic import Field
 
@@ -291,7 +292,7 @@ class LabelRowMetadata(Formatter):
     """Only available for certain read requests"""
     is_valid: bool = True
 
-    backing_item_uuid: Optional[str] = None
+    backing_item_uuid: Optional[UUID] = None
 
     @classmethod
     def from_dict(cls, json_dict: Dict) -> LabelRowMetadata:
@@ -428,7 +429,7 @@ class LabelRowMetadataDTO(BaseDTO):
     """Only available for certain read requests"""
     is_valid: bool = True
 
-    backing_item_uuid: Optional[str] = None
+    backing_item_uuid: Optional[UUID] = None
 
 
 def label_row_metadata_dto_to_label_row_metadata(label_row_metadata_dto: LabelRowMetadataDTO) -> LabelRowMetadata: