코드 검토 및 문서 반영

lib/extension-requests.ts

@@ -3,7 +3,7 @@ import { z } from "zod";
 import { db } from "@/lib/db";
 import { logger } from "@/lib/logger";
 import { ApiError } from "@/lib/errors";
-import { REQUEST_STATUSES } from "@/lib/constants";
+import { PAID_ACCOUNT_TYPE_VALUES, REQUEST_STATUSES } from "@/lib/constants";
 import type { Prisma } from "@/lib/generated/prisma/client";
 import {
   calculateExtendedAvailableDate,
@@ -158,22 +158,25 @@ export async function approveExtensionRequest(
 }
 
 export async function createExtensionRequest(
-  maestroID: number,
-  accountType: number
+  maestroID: number
 ): Promise<{ maestroExtensionID: number; requestedDateTime: string; status: number }> {
   const maestro = await db.maestro.findUnique({
     where: { MaestroID: maestroID },
-    select: { MaestroID: true },
+    select: { AccountType: true },
   });
 
   if (!maestro) {
     throw new ApiError("마에스트로를 찾을 수 없습니다.", 404);
   }
 
+  if (!(PAID_ACCOUNT_TYPE_VALUES as readonly number[]).includes(maestro.AccountType)) {
+    throw new ApiError("유료 요금제 계정만 연장 신청이 가능합니다.", 400);
+  }
+
   const request = await db.maestro_extension.create({
     data: {
       MaestroID: maestroID,
-      AccountType: accountType,
+      AccountType: maestro.AccountType,
       RequestedDateTime: new Date(),
       Status: REQUEST_STATUSES.REQUESTED,
     },