fix(compat): set last_updated when storing a task in v0.3 format

src/a2a/compat/v0_3/model_conversions.py

@@ -32,6 +32,11 @@ def core_to_compat_task_model(task: pb2_v10.Task, owner: str) -> TaskModel:
         artifacts=data.get('artifacts'),
         task_metadata=data.get('metadata'),
         protocol_version='0.3',
+        last_updated=(
+            task.status.timestamp.ToDatetime()
+            if task.status.HasField('timestamp')
+            else None
+        ),
     )
 
 

tests/compat/v0_3/test_conversions.py

@@ -1,6 +1,8 @@
 import base64
 import json
 
+from datetime import datetime
+
 import pytest
 
 from a2a.compat.v0_3 import types as types_v03
@@ -1963,6 +1965,18 @@ def test_task_db_conversion():
     assert v10_restored.metadata == v10_task.metadata
 
 
+def test_task_db_conversion_sets_last_updated():
+    """The status timestamp becomes last_updated, as in the v1.0 model."""
+    v10_task = pb2_v10.Task(id='task-123', context_id='ctx-456')
+    v10_task.status.timestamp.FromJsonString('2026-10-01T12:00:00Z')
+
+    model = core_to_compat_task_model(v10_task, 'owner-789')
+    assert model.last_updated == datetime(2026, 10, 1, 12, 0)
+
+    v10_task.status.ClearField('timestamp')
+    assert core_to_compat_task_model(v10_task, 'owner-789').last_updated is None
+
+
 def test_push_notification_config_db_conversion():
     task_id = 'task-123'
     v10_config = pb2_v10.TaskPushNotificationConfig(