修复：强化装填事务一致性

shierfeng-fastapi-backend/tests/module_business/test_master_service.py

@@ -502,6 +502,24 @@ class TestMasterDao(unittest.IsolatedAsyncioTestCase):
             self.assertIn(f'FROM {table}', sql)
             self.assertIn(f'{table}.{id_field} = 9', sql)
 
+    async def test_locking_master_gets_use_current_reads_and_refresh_identity_map(self) -> None:
+        strain_lock_parameter = inspect.signature(MasterDao.get_strain).parameters.get('for_update')
+        self.assertIsNotNone(strain_lock_parameter)
+        self.assertIs(inspect.Parameter.KEYWORD_ONLY, strain_lock_parameter.kind)
+        self.assertFalse(strain_lock_parameter.default)
+
+        for resource in ('warehouse', 'strain'):
+            with self.subTest(resource=resource):
+                result = MagicMock()
+                result.scalar_one_or_none.return_value = None
+                self.db.execute = AsyncMock(return_value=result)
+
+                await getattr(MasterDao, f'get_{resource}')(self.db, 9, for_update=True)
+
+                statement = self.db.execute.await_args.args[0]
+                self.assertIn('FOR UPDATE', compile_sql(statement))
+                self.assertIs(True, statement.get_execution_options().get('populate_existing'))
+
     async def test_unique_queries_use_global_or_parent_scoped_predicates(self) -> None:
         cases = (
             ('strain', ('S001',), 'biz_strain', ('strain_code',)),