From ddb5b4f92477e41215096539c4e4df98ab63f9b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EC=B5=9C=EC=A4=80=ED=9D=A0?= <choi.jh@prime-idc.jp>
Date: Wed, 17 Dec 2025 13:26:09 +0900
Subject: [PATCH] dbmsv4 init...3

---
 app/Entities/Equipment/ServerPartEntity.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/Entities/Equipment/ServerPartEntity.php b/app/Entities/Equipment/ServerPartEntity.php
index 66ef6fe..6c42a8c 100644
--- a/app/Entities/Equipment/ServerPartEntity.php
+++ b/app/Entities/Equipment/ServerPartEntity.php
@@ -37,7 +37,7 @@ class ServerPartEntity extends EquipmentEntity
     {
         return $this->attributes['billing'];
     }
-    public function getBillingAt(): string
+    public function getBillingAt(): ?string
     {
         return $this->attributes['billing_at'];
     }