diff --git a/deploy/sql/头程数据库统一增量-MySQL8.sql b/deploy/sql/头程数据库统一增量-MySQL8.sql
index 9f35980e2..271ad12d9 100644
--- a/deploy/sql/头程数据库统一增量-MySQL8.sql
+++ b/deploy/sql/头程数据库统一增量-MySQL8.sql
@@ -16395,6 +16395,7 @@ CALL baiyue_iam.assert_overseas_pda_picker_permission();
 DROP PROCEDURE baiyue_iam.assert_overseas_pda_picker_permission;
 
 -- 四期仓库后台角色严格最小授权：list 同时覆盖列表与详情，只读角色不得获得任何写权限。
+USE baiyue_iam;
 DROP TEMPORARY TABLE IF EXISTS tmp_phase4_warehouse_role_permission;
 CREATE TEMPORARY TABLE tmp_phase4_warehouse_role_permission (
   role_code VARCHAR(64) NOT NULL,
diff --git a/scripts/admin-test-env-modules/phase4-canonical-warehouse-rbac-contract.test.mjs b/scripts/admin-test-env-modules/phase4-canonical-warehouse-rbac-contract.test.mjs
index c1fdaa0fe..d36246ae5 100644
--- a/scripts/admin-test-env-modules/phase4-canonical-warehouse-rbac-contract.test.mjs
+++ b/scripts/admin-test-env-modules/phase4-canonical-warehouse-rbac-contract.test.mjs
@@ -4,6 +4,7 @@ import { readFileSync } from 'node:fs'
 
 const acceptance = readFileSync(new URL('./phase3-warehouse-rbac.mjs', import.meta.url), 'utf8')
 const iamSql = readFileSync(new URL('../../iam/src/main/resources/db/lastleg-permissions.sql', import.meta.url), 'utf8')
+const unifiedSql = readFileSync(new URL('../../deploy/sql/头程数据库统一增量-MySQL8.sql', import.meta.url), 'utf8')
 
 const listCodes = [
   'platform:overseas-warehouse:last-mile-order:list',
@@ -37,3 +38,11 @@ test('picker stays isolated to the dedicated overseas PDA authority', () => {
   assert.match(iamSql, /role\.role_code='WAREHOUSE_PICKER'/)
   assert.match(iamSql, /permission\.permission_code='lastleg:pda:operate'/)
 })
+
+test('unified migration creates the phase-four role matrix in the IAM schema used by its assertion routine', () => {
+  assert.match(
+    unifiedSql,
+    /USE baiyue_iam;\s*DROP TEMPORARY TABLE IF EXISTS tmp_phase4_warehouse_role_permission;\s*CREATE TEMPORARY TABLE tmp_phase4_warehouse_role_permission/,
+  )
+  assert.match(unifiedSql, /CREATE PROCEDURE baiyue_iam\.assert_phase4_warehouse_role_minimum\(\)/)
+})