diff --git a/shierfeng-fastapi-backend/tests/module_business/test_master_service.py b/shierfeng-fastapi-backend/tests/module_business/test_master_service.py
index 61b2eed..a4ae7e6 100644
--- a/shierfeng-fastapi-backend/tests/module_business/test_master_service.py
+++ b/shierfeng-fastapi-backend/tests/module_business/test_master_service.py
@@ -1,4 +1,5 @@
 import inspect
+import re
 import unittest
 from contextlib import ExitStack
 from datetime import datetime
@@ -8,6 +9,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 from fastapi import FastAPI
 from fastapi.routing import APIRoute
+from sqlalchemy.dialects import mysql, postgresql
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -753,36 +755,48 @@ class TestMasterDao(unittest.IsolatedAsyncioTestCase):
 
     async def test_master_removability_uses_the_same_reference_constraints_as_delete(self) -> None:
         expected = {
-            'strain': (('biz_filling_record', ('strain_id',)),),
-            'customer': (('biz_customer_site', ('customer_id',)),),
+            'strain': ('biz_strain', 'strain_id', (('biz_filling_record', ('strain_id',)),)),
+            'customer': ('biz_customer', 'customer_id', (('biz_customer_site', ('customer_id',)),)),
             'site': (
-                ('biz_production_line', ('site_id',)),
-                ('biz_user_site', ('site_id',)),
-                ('biz_shipment_order', ('target_site_id',)),
-                ('biz_usage_record', ('site_id',)),
-                ('biz_return_order', ('source_site_id',)),
-                ('biz_pallet_inventory', ('site_id',)),
-                ('biz_pallet_event', ('before_site_id', 'after_site_id')),
+                'biz_customer_site',
+                'site_id',
+                (
+                    ('biz_production_line', ('site_id',)),
+                    ('biz_user_site', ('site_id',)),
+                    ('biz_shipment_order', ('target_site_id',)),
+                    ('biz_usage_record', ('site_id',)),
+                    ('biz_return_order', ('source_site_id',)),
+                    ('biz_pallet_inventory', ('site_id',)),
+                    ('biz_pallet_event', ('before_site_id', 'after_site_id')),
+                ),
             ),
             'line': (
-                ('biz_usage_record', ('line_id',)),
-                ('biz_pallet_inventory', ('current_line_id',)),
-                ('biz_pallet_event', ('before_line_id', 'after_line_id')),
+                'biz_production_line',
+                'line_id',
+                (
+                    ('biz_usage_record', ('line_id',)),
+                    ('biz_pallet_inventory', ('current_line_id',)),
+                    ('biz_pallet_event', ('before_line_id', 'after_line_id')),
+                ),
             ),
             'warehouse': (
-                ('biz_user_warehouse', ('warehouse_id',)),
-                ('biz_inbound_order', ('warehouse_id',)),
-                ('biz_filling_record', ('warehouse_id',)),
-                ('biz_shipment_order', ('source_warehouse_id',)),
-                ('biz_return_order', ('target_warehouse_id',)),
-                ('biz_pallet_inventory', ('warehouse_id',)),
-                ('biz_pallet_event', ('before_warehouse_id', 'after_warehouse_id')),
+                'biz_warehouse',
+                'warehouse_id',
+                (
+                    ('biz_user_warehouse', ('warehouse_id',)),
+                    ('biz_inbound_order', ('warehouse_id',)),
+                    ('biz_filling_record', ('warehouse_id',)),
+                    ('biz_shipment_order', ('source_warehouse_id',)),
+                    ('biz_return_order', ('target_warehouse_id',)),
+                    ('biz_pallet_inventory', ('warehouse_id',)),
+                    ('biz_pallet_event', ('before_warehouse_id', 'after_warehouse_id')),
+                ),
             ),
         }
         method = getattr(MasterDao, 'get_master_removability', None)
         self.assertIsNotNone(method)
 
-        for resource, references in expected.items():
+        for resource, (outer_table, outer_id, references) in expected.items():
             result = MagicMock()
             result.all.return_value = [(1, True), (2, False)]
             self.db.execute = AsyncMock(return_value=result)
@@ -790,11 +804,29 @@ class TestMasterDao(unittest.IsolatedAsyncioTestCase):
             removability = await method(self.db, resource, [1, 2, 3])
 
             self.assertEqual({1: True, 2: False, 3: False}, removability)
-            sql = compile_sql(self.db.execute.await_args.args[0])
-            for table, columns in references:
-                self.assertIn(f'FROM {table}', sql)
-                for column in columns:
-                    self.assertIn(f'{table}.{column}', sql)
+            statement = self.db.execute.await_args.args[0]
+            for dialect in (mysql.dialect(), postgresql.dialect()):
+                with self.subTest(resource=resource, dialect=dialect.name):
+                    sql = ' '.join(
+                        str(statement.compile(dialect=dialect, compile_kwargs={'literal_binds': True})).split()
+                    )
+                    self.assertEqual(len(references), len(re.findall(r'NOT\s+\(?EXISTS\s+\(', sql)))
+                    for table, columns in references:
+                        self.assertRegex(
+                            sql,
+                            rf'NOT\s+\(?EXISTS\s+\(SELECT {table}\.{columns[0]} FROM {table} WHERE ',
+                        )
+                        for column in columns:
+                            self.assertIn(f'{table}.{column} = {outer_table}.{outer_id}', sql)
+
+    async def test_master_removability_short_circuits_empty_resource_ids(self) -> None:
+        self.db.execute = AsyncMock()
+
+        for resource in RESOURCE_IDS:
+            with self.subTest(resource=resource):
+                self.assertEqual({}, await MasterDao.get_master_removability(self.db, resource, []))
+
+        self.db.execute.assert_not_awaited()
 
 
 class TestMasterControllers(unittest.TestCase):