diff --git a/backend/migrations/migrations_test.go b/backend/migrations/migrations_test.go
index 069212b..3e04af8 100644
--- a/backend/migrations/migrations_test.go
+++ b/backend/migrations/migrations_test.go
@@ -107,9 +107,31 @@ func TestBaselineDoesNotAlterProductionLikeSchema(t *testing.T) {
 	if err != nil {
 		t.Fatalf("旧库执行后续迁移失败: %v", err)
 	}
-	if len(applied) != 2 || applied[0] != "0002_legacy_schema_patches" || applied[1] != "0003_billing_settings" {
-		t.Fatalf("旧库不应重跑 0001，实际执行: %v", applied)
+	// 断言真实意图：旧库不得重跑基线，且已登记的后续迁移不能再执行。
+	// 不再写死迁移条数——否则每新增一个迁移都会误报。 // Logan.Li
+	for _, v := range applied {
+		if v == BaselineVersion {
+			t.Fatalf("旧库不应重跑基线 %s，实际执行: %v", BaselineVersion, applied)
+		}
+		if v == "0001_agent_credentials" {
+			t.Fatalf("旧库不应重跑 0001，实际执行: %v", applied)
+		}
 	}
+	for _, want := range []string{"0002_legacy_schema_patches", "0003_billing_settings"} {
+		if !containsString(applied, want) {
+			t.Fatalf("旧库应补跑迁移 %s，实际执行: %v", want, applied)
+		}
+	}
+}
+
+// containsString 判断字符串切片是否包含目标值。 // Logan.Li
+func containsString(list []string, want string) bool {
+	for _, v := range list {
+		if v == want {
+			return true
+		}
+	}
+	return false
 }
 
 // schemaDefinitions 读取 SQLite 表定义，供基线非破坏性回归测试使用。 // Logan.Li