fix(storage): finish SQLite transactions before propagating cancellation

test/storage/test_storage_config_and_locks.py

@@ -6,6 +6,7 @@ from uuid import uuid4
 import pytest
 
 from src.core.config import Config
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
 from src.storage.runtime import StorageSettings, open_storage
 from .test_persistence import run
 
@@ -36,7 +37,7 @@ def test_sqlite_requires_migration_and_does_not_fall_back(tmp_path):
                 pytest.fail('Uninitialized durable storage must not start')
         async with open_storage(replace(config,auto_migrate=True)): pass
         async with open_storage(config) as runtime:
-            assert runtime.checkpointer.__class__.__name__=='AsyncSqliteSaver'
+            assert isinstance(runtime.checkpointer, AsyncSqliteSaver)
     run(scenario())