diff --git a/api.hyungi.net/config/routes.js b/api.hyungi.net/config/routes.js
index 9d233ed..f5223c2 100644
--- a/api.hyungi.net/config/routes.js
+++ b/api.hyungi.net/config/routes.js
@@ -40,7 +40,7 @@ function setupRoutes(app) {
   const attendanceRoutes = require('../routes/attendanceRoutes');
   const monthlyStatusRoutes = require('../routes/monthlyStatusRoutes');
   const pageAccessRoutes = require('../routes/pageAccessRoutes');
-  const tbmRoutes = require('../routes/tbmRoutes');
+  // const tbmRoutes = require('../routes/tbmRoutes'); // 임시 비활성화 - db/connection 문제
 
   // Rate Limiters 설정
   const rateLimit = require('express-rate-limit');
@@ -128,7 +128,7 @@ function setupRoutes(app) {
   app.use('/api/tools', toolsRoute);
   app.use('/api/users', userRoutes);
   app.use('/api', pageAccessRoutes); // 페이지 접근 권한 관리
-  app.use('/api/tbm', tbmRoutes); // TBM 시스템
+  // app.use('/api/tbm', tbmRoutes); // TBM 시스템 - 임시 비활성화
   app.use('/api', uploadBgRoutes);
 
   // Swagger API 문서
diff --git a/api.hyungi.net/controllers/authController.js b/api.hyungi.net/controllers/authController.js
index bf9e598..adb2047 100644
--- a/api.hyungi.net/controllers/authController.js
+++ b/api.hyungi.net/controllers/authController.js
@@ -2,7 +2,8 @@ const { getDb } = require('../dbPool');
 const bcrypt = require('bcryptjs');
 const jwt = require('jsonwebtoken');
 const authService = require('../services/auth.service');
-const { ApiError, asyncHandler } = require('../utils/errorHandler');
+const { asyncHandler } = require('../utils/errorHandler');
+const { AuthenticationError, ValidationError } = require('../utils/errors');
 const { validateSchema, schemas } = require('../utils/validator');
 
 const login = asyncHandler(async (req, res) => {
@@ -12,13 +13,13 @@ const login = asyncHandler(async (req, res) => {
 
   // 유효성 검사
   if (!username || !password) {
-    throw new ApiError('사용자명과 비밀번호를 입력해주세요.', 400);
+    throw new ValidationError('사용자명과 비밀번호를 입력해주세요.');
   }
 
   const result = await authService.loginService(username, password, ipAddress, userAgent);
 
   if (!result.success) {
-    throw new ApiError(result.error, result.status || 400);
+    throw new AuthenticationError(result.error);
   }
 
   // 로그인 성공 후, 메인 대시보드로 리다이렉트
diff --git a/api.hyungi.net/db/connection.js b/api.hyungi.net/db/connection.js
new file mode 100644
index 0000000..9ad0597
--- /dev/null
+++ b/api.hyungi.net/db/connection.js
@@ -0,0 +1,17 @@
+// db/connection.js - 레거시 콜백 방식 DB 래퍼
+const { getDb } = require('../dbPool');
+
+// 콜백 방식 쿼리 래퍼
+const query = async (sql, params, callback) => {
+  try {
+    const db = await getDb();
+    const [results] = await db.query(sql, params);
+    callback(null, results);
+  } catch (error) {
+    callback(error);
+  }
+};
+
+module.exports = {
+  query
+};