fix(gift): 관리자 취소 시각을 초 단위로 정규화한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/gift/application/GiftAdminService.kt

@@ -16,6 +16,7 @@ import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
 import java.time.LocalDateTime
+import java.time.temporal.ChronoUnit
 
 data class GiftCategoryCommand(
     val classificationNumber: String,
@@ -157,12 +158,13 @@ class GiftAdminService(
         val gift = giftRepository.findByApplicationNoForUpdate(applicationNo) ?: throw invalidRequest()
         if (gift.status != GiftStatus.RECEIVED) throw invalidRequest()
         val delivery = giftDeliveryRepository.findByGiftId(requireNotNull(gift.id)) ?: throw invalidRequest()
+        val canceledAt = now.truncatedTo(ChronoUnit.SECONDS)
 
         gift.status = GiftStatus.CANCELED
-        delivery.canceledAt = now
+        delivery.canceledAt = canceledAt
         canPaymentService.refundGiftCan(gift.senderMemberId, gift.canUsageId)
 
-        return GiftOperationStatusResult(gift.applicationNo, gift.status, gift.status.displayName, now)
+        return GiftOperationStatusResult(gift.applicationNo, gift.status, gift.status.displayName, canceledAt)
     }
 
     @Transactional