diff --git a/sso-auth-service/controllers/authController.js b/sso-auth-service/controllers/authController.js
index 04c2ada..657a439 100644
--- a/sso-auth-service/controllers/authController.js
+++ b/sso-auth-service/controllers/authController.js
@@ -21,7 +21,9 @@ function createTokenPayload(user) {
     id: user.user_id,
     username: user.username,
     name: user.name,
-    worker_id: user.worker_id || null,
+    department_id: user.department_id || null,
+    department_name: user.department_name || user.department || null,
+    is_production: user.is_production || false,
     department: user.department,
     role: user.role,
     access_level: user.role,
@@ -78,8 +80,10 @@ async function login(req, res, next) {
         username: user.username,
         name: user.name,
         department: user.department,
+        department_id: user.department_id || null,
+        department_name: user.department_name || user.department || null,
+        is_production: user.is_production || false,
         role: user.role,
-        worker_id: user.worker_id || null,
         system_access: payload.system_access
       }
     });
@@ -154,8 +158,10 @@ async function validate(req, res, next) {
         username: user.username,
         name: user.name,
         department: user.department,
+        department_id: user.department_id || null,
+        department_name: user.department_name || user.department || null,
+        is_production: user.is_production || false,
         role: user.role,
-        worker_id: user.worker_id || null,
         system_access: {
           system1: user.system1_access,
           system2: user.system2_access,
diff --git a/sso-auth-service/models/userModel.js b/sso-auth-service/models/userModel.js
index 6fbd8a3..5c32bca 100644
--- a/sso-auth-service/models/userModel.js
+++ b/sso-auth-service/models/userModel.js
@@ -84,7 +84,10 @@ async function hashPassword(password) {
 async function findByUsername(username) {
   const db = getPool();
   const [rows] = await db.query(
-    'SELECT * FROM sso_users WHERE username = ? AND is_active = TRUE',
+    `SELECT s.*, d.department_id, d.department_name, d.is_production
+     FROM sso_users s
+     LEFT JOIN departments d ON s.department_id = d.department_id
+     WHERE s.username = ? AND s.is_active = TRUE`,
     [username]
   );
   return rows[0] || null;
@@ -93,7 +96,10 @@ async function findByUsername(username) {
 async function findById(userId) {
   const db = getPool();
   const [rows] = await db.query(
-    'SELECT * FROM sso_users WHERE user_id = ?',
+    `SELECT s.*, d.department_id, d.department_name, d.is_production
+     FROM sso_users s
+     LEFT JOIN departments d ON s.department_id = d.department_id
+     WHERE s.user_id = ?`,
     [userId]
   );
   return rows[0] || null;
diff --git a/system1-factory/api/config/swagger.js b/system1-factory/api/config/swagger.js
index ce2621a..e448dcb 100644
--- a/system1-factory/api/config/swagger.js
+++ b/system1-factory/api/config/swagger.js
@@ -154,10 +154,10 @@ const swaggerDefinition = {
             example: 'admin',
             description: '접근 권한 레벨'
           },
-          worker_id: {
+          user_id: {
             type: 'integer',
             example: 1,
-            description: '연결된 작업자 ID'
+            description: '연결된 사용자 ID (sso_users)'
           },
           is_active: {
             type: 'boolean',
@@ -186,10 +186,10 @@ const swaggerDefinition = {
       Worker: {
         type: 'object',
         properties: {
-          worker_id: {
+          user_id: {
             type: 'integer',
             example: 1,
-            description: '작업자 ID'
+            description: '사용자 ID (sso_users)'
           },
           worker_name: {
             type: 'string',
@@ -347,10 +347,10 @@ const swaggerDefinition = {
             example: '2024-01-01',
             description: '작업 날짜'
           },
-          worker_id: {
+          user_id: {
             type: 'integer',
             example: 1,
-            description: '작업자 ID'
+            description: '사용자 ID (sso_users)'
           },
           project_id: {
             type: 'integer',
diff --git a/system1-factory/api/controllers/attendanceController.js b/system1-factory/api/controllers/attendanceController.js
index 124a4cd..f5ded7b 100644
--- a/system1-factory/api/controllers/attendanceController.js
+++ b/system1-factory/api/controllers/attendanceController.js
@@ -28,8 +28,8 @@ const getDailyAttendanceStatus = asyncHandler(async (req, res) => {
  * 일일 근태 기록 조회
  */
 const getDailyAttendanceRecords = asyncHandler(async (req, res) => {
-  const { date, worker_id } = req.query;
-  const data = await attendanceService.getDailyAttendanceRecordsService(date, worker_id);
+  const { date, user_id } = req.query;
+  const data = await attendanceService.getDailyAttendanceRecordsService(date, user_id);
 
   res.json({
     success: true,
@@ -42,8 +42,8 @@ const getDailyAttendanceRecords = asyncHandler(async (req, res) => {
  * 기간별 근태 기록 조회 (월별 조회용)
  */
 const getAttendanceRecordsByRange = asyncHandler(async (req, res) => {
-  const { start_date, end_date, worker_id } = req.query;
-  const data = await attendanceService.getAttendanceRecordsByRangeService(start_date, end_date, worker_id);
+  const { start_date, end_date, user_id } = req.query;
+  const data = await attendanceService.getAttendanceRecordsByRangeService(start_date, end_date, user_id);
 
   res.json({
     success: true,
@@ -76,7 +76,7 @@ const upsertAttendanceRecord = asyncHandler(async (req, res) => {
 const processVacation = asyncHandler(async (req, res) => {
   const vacationData = {
     record_date: req.body.date,
-    worker_id: req.body.worker_id,
+    user_id: req.body.user_id,
     vacation_type_id: req.body.vacation_type,
     created_by: req.user?.user_id || req.user?.id
   };
@@ -96,7 +96,7 @@ const processVacation = asyncHandler(async (req, res) => {
 const approveOvertime = asyncHandler(async (req, res) => {
   const overtimeData = {
     record_date: req.body.date,
-    worker_id: req.body.worker_id,
+    user_id: req.body.user_id,
     overtime_approved: true,
     approved_by: req.user?.user_id || req.user?.id
   };
@@ -140,8 +140,8 @@ const getVacationTypes = asyncHandler(async (req, res) => {
  * 작업자 휴가 잔여 조회
  */
 const getWorkerVacationBalance = asyncHandler(async (req, res) => {
-  const { worker_id } = req.params;
-  const data = await attendanceService.getWorkerVacationBalanceService(parseInt(worker_id));
+  const { user_id } = req.params;
+  const data = await attendanceService.getWorkerVacationBalanceService(parseInt(user_id));
 
   res.json({
     success: true,
@@ -154,11 +154,11 @@ const getWorkerVacationBalance = asyncHandler(async (req, res) => {
  * 월별 근태 통계
  */
 const getMonthlyAttendanceStats = asyncHandler(async (req, res) => {
-  const { year, month, worker_id } = req.query;
+  const { year, month, user_id } = req.query;
   const data = await attendanceService.getMonthlyAttendanceStatsService(
     parseInt(year),
     parseInt(month),
-    worker_id ? parseInt(worker_id) : null
+    user_id ? parseInt(user_id) : null
   );
 
   res.json({
@@ -186,7 +186,7 @@ const getCheckinList = asyncHandler(async (req, res) => {
  * 출근 체크 저장 (일괄 처리)
  */
 const saveCheckins = asyncHandler(async (req, res) => {
-  const { date, checkins } = req.body; // checkins: [{worker_id, is_present}, ...]
+  const { date, checkins } = req.body; // checkins: [{user_id, is_present}, ...]
   const result = await attendanceService.saveCheckinsService(date, checkins);
 
   res.json({
diff --git a/system1-factory/api/controllers/dailyIssueReportController.js b/system1-factory/api/controllers/dailyIssueReportController.js
index 6dca260..32a5ea9 100644
--- a/system1-factory/api/controllers/dailyIssueReportController.js
+++ b/system1-factory/api/controllers/dailyIssueReportController.js
@@ -14,10 +14,10 @@ const { asyncHandler } = require('../middlewares/errorHandler');
  * 일일 이슈 보고서 생성
  */
 const createDailyIssueReport = asyncHandler(async (req, res) => {
-  // 프론트엔드에서 worker_ids 또는 worker_id로 보낼 수 있음
+  // 프론트엔드에서 user_ids 또는 user_id로 보낼 수 있음
   const issueData = {
     ...req.body,
-    worker_ids: req.body.worker_ids || req.body.worker_id
+    user_ids: req.body.user_ids || req.body.user_id
   };
 
   const result = await dailyIssueReportService.createDailyIssueReportService(issueData);
diff --git a/system1-factory/api/controllers/dailyWorkReportController.js b/system1-factory/api/controllers/dailyWorkReportController.js
index e01621a..69f1a3c 100644
--- a/system1-factory/api/controllers/dailyWorkReportController.js
+++ b/system1-factory/api/controllers/dailyWorkReportController.js
@@ -36,19 +36,19 @@ const createDailyWorkReport = asyncHandler(async (req, res) => {
  * 기여자별 요약 조회
  */
 const getContributorsSummary = asyncHandler(async (req, res) => {
-  const { date, worker_id } = req.query;
+  const { date, user_id } = req.query;
 
-  if (!date || !worker_id) {
-    return res.status(400).json({ error: 'date와 worker_id가 필요합니다.' });
+  if (!date || !user_id) {
+    return res.status(400).json({ error: 'date와 user_id가 필요합니다.' });
   }
 
-  const data = await dailyWorkReportModel.getContributorsByDate(date, worker_id);
+  const data = await dailyWorkReportModel.getContributorsByDate(date, user_id);
 
   const totalHours = data.reduce((sum, contributor) => sum + parseFloat(contributor.total_hours || 0), 0);
 
   const result = {
     date,
-    worker_id,
+    user_id,
     contributors: data,
     total_contributors: data.length,
     grand_total_hours: totalHours
@@ -61,13 +61,13 @@ const getContributorsSummary = asyncHandler(async (req, res) => {
  * 개인 누적 현황 조회
  */
 const getMyAccumulatedData = async (req, res) => {
-  const { date, worker_id } = req.query;
+  const { date, user_id } = req.query;
   const created_by = req.user?.user_id || req.user?.id;
 
-  if (!date || !worker_id) {
+  if (!date || !user_id) {
     return res.status(400).json({
-      error: 'date와 worker_id가 필요합니다.',
-      example: 'date=2024-06-16&worker_id=1'
+      error: 'date와 user_id가 필요합니다.',
+      example: 'date=2024-06-16&user_id=1'
     });
   }
 
@@ -78,11 +78,11 @@ const getMyAccumulatedData = async (req, res) => {
   }
 
   try {
-    const data = await dailyWorkReportModel.getMyAccumulatedHours(date, worker_id, created_by);
+    const data = await dailyWorkReportModel.getMyAccumulatedHours(date, user_id, created_by);
 
     res.json({
       date,
-      worker_id,
+      user_id,
       created_by,
       my_data: data,
       timestamp: new Date().toISOString()
@@ -187,14 +187,14 @@ const getDailyWorkReportsByDate = async (req, res) => {
  * 작업보고서 검색 (페이지네이션 포함)
  */
 const searchWorkReports = async (req, res) => {
-  const { start_date, end_date, worker_id, project_id, work_status_id, page = 1, limit = 20 } = req.query;
+  const { start_date, end_date, user_id, project_id, work_status_id, page = 1, limit = 20 } = req.query;
   const created_by = req.user?.user_id || req.user?.id;
 
   if (!start_date || !end_date) {
     return res.status(400).json({
       error: 'start_date와 end_date가 필요합니다.',
       example: 'start_date=2024-01-01&end_date=2024-01-31',
-      optional: ['worker_id', 'project_id', 'work_status_id', 'page', 'limit']
+      optional: ['user_id', 'project_id', 'work_status_id', 'page', 'limit']
     });
   }
 
@@ -207,7 +207,7 @@ const searchWorkReports = async (req, res) => {
   const searchParams = {
     start_date,
     end_date,
-    worker_id: worker_id ? parseInt(worker_id) : null,
+    user_id: user_id ? parseInt(user_id) : null,
     project_id: project_id ? parseInt(project_id) : null,
     work_status_id: work_status_id ? parseInt(work_status_id) : null,
     created_by,
@@ -377,7 +377,7 @@ const removeDailyWorkReport = async (req, res) => {
  * 작업자의 특정 날짜 전체 삭제
  */
 const removeDailyWorkReportByDateAndWorker = async (req, res) => {
-  const { date, worker_id } = req.params;
+  const { date, user_id } = req.params;
   const deleted_by = req.user?.user_id || req.user?.id;
   const access_level = req.user?.access_level || req.user?.role;
 
@@ -397,20 +397,20 @@ const removeDailyWorkReportByDateAndWorker = async (req, res) => {
   }
 
   try {
-    const affectedRows = await dailyWorkReportModel.removeByDateAndWorker(date, worker_id, deleted_by);
+    const affectedRows = await dailyWorkReportModel.removeByDateAndWorker(date, user_id, deleted_by);
 
     if (affectedRows === 0) {
       return res.status(404).json({
         error: '삭제할 작업보고서를 찾을 수 없습니다.',
         date: date,
-        worker_id: worker_id
+        user_id: user_id
       });
     }
 
     res.json({
-      message: `${date} 날짜의 작업자 ${worker_id} 작업보고서 ${affectedRows}개가 삭제되었습니다.`,
+      message: `${date} 날짜의 작업자 ${user_id} 작업보고서 ${affectedRows}개가 삭제되었습니다.`,
       date,
-      worker_id,
+      user_id,
       affected_rows: affectedRows,
       deleted_by,
       timestamp: new Date().toISOString()
@@ -642,21 +642,21 @@ const deleteErrorType = asyncHandler(async (req, res) => {
  * 누적 현황 조회
  */
 const getAccumulatedReports = async (req, res) => {
-  const { date, worker_id } = req.query;
+  const { date, user_id } = req.query;
 
-  if (!date || !worker_id) {
+  if (!date || !user_id) {
     return res.status(400).json({
-      error: 'date와 worker_id가 필요합니다.',
-      example: 'date=2024-06-16&worker_id=1'
+      error: 'date와 user_id가 필요합니다.',
+      example: 'date=2024-06-16&user_id=1'
     });
   }
 
   try {
-    const data = await dailyWorkReportModel.getAccumulatedReportsByDate(date, worker_id);
+    const data = await dailyWorkReportModel.getAccumulatedReportsByDate(date, user_id);
 
     res.json({
       date,
-      worker_id,
+      user_id,
       total_entries: data.length,
       accumulated_data: data,
       timestamp: new Date().toISOString()
@@ -678,7 +678,7 @@ const createFromTbm = async (req, res) => {
     const {
       tbm_assignment_id,
       tbm_session_id,
-      worker_id,
+      user_id,
       project_id,
       work_type_id,
       report_date,
@@ -691,10 +691,10 @@ const createFromTbm = async (req, res) => {
     } = req.body;
 
     // 필수 필드 검증
-    if (!tbm_assignment_id || !tbm_session_id || !worker_id || !report_date || !total_hours) {
+    if (!tbm_assignment_id || !tbm_session_id || !user_id || !report_date || !total_hours) {
       return res.status(400).json({
         success: false,
-        message: '필수 필드가 누락되었습니다. (assignment_id, session_id, worker_id, report_date, total_hours)'
+        message: '필수 필드가 누락되었습니다. (assignment_id, session_id, user_id, report_date, total_hours)'
       });
     }
 
@@ -704,7 +704,7 @@ const createFromTbm = async (req, res) => {
     const reportData = {
       tbm_assignment_id,
       tbm_session_id,
-      worker_id,
+      user_id,
       project_id,
       work_type_id,
       report_date,
diff --git a/system1-factory/api/controllers/monthlyStatusController.js b/system1-factory/api/controllers/monthlyStatusController.js
index c34c5df..cc57a44 100644
--- a/system1-factory/api/controllers/monthlyStatusController.js
+++ b/system1-factory/api/controllers/monthlyStatusController.js
@@ -101,7 +101,7 @@ const getDailyWorkerDetails = asyncHandler(async (req, res) => {
 
     // 데이터 변환
     const formattedData = workerDetails.map(worker => ({
-      workerId: worker.worker_id,
+      userId: worker.user_id,
       workerName: worker.worker_name,
       jobType: worker.job_type,
       totalHours: parseFloat(worker.total_work_hours || 0),
diff --git a/system1-factory/api/controllers/patrolController.js b/system1-factory/api/controllers/patrolController.js
index e810a9c..c46b990 100644
--- a/system1-factory/api/controllers/patrolController.js
+++ b/system1-factory/api/controllers/patrolController.js
@@ -416,7 +416,7 @@ const PatrolController = {
           LEFT JOIN tasks t ON ts.task_id = t.task_id
           LEFT JOIN work_types wt ON t.work_type_id = wt.id
           LEFT JOIN users u ON ts.leader_id = u.user_id
-          LEFT JOIN workers w ON ts.leader_worker_id = w.worker_id
+          LEFT JOIN workers w ON ts.leader_user_id = w.user_id
           WHERE ts.category_id = ? AND ts.session_date = ?
           ORDER BY ts.created_at DESC
         `, [categoryId, targetDate]);
@@ -433,7 +433,7 @@ const PatrolController = {
             SELECT tta.assignment_id, w.worker_name, w.occupation,
                    tta.attendance_status, tta.signature_image
             FROM tbm_team_assignments tta
-            JOIN workers w ON tta.worker_id = w.worker_id
+            JOIN workers w ON tta.user_id = w.user_id
             WHERE tta.session_id = ?
             ORDER BY w.worker_name
           `, [session.session_id]);
diff --git a/system1-factory/api/controllers/tbmController.js b/system1-factory/api/controllers/tbmController.js
index 52447ea..cb44eff 100644
--- a/system1-factory/api/controllers/tbmController.js
+++ b/system1-factory/api/controllers/tbmController.js
@@ -10,7 +10,7 @@ const TbmController = {
     try {
       const sessionData = {
         session_date: req.body.session_date,
-        leader_id: req.body.leader_id || null,
+        leader_user_id: req.body.leader_user_id || null,
         project_id: req.body.project_id || null,
         work_location: req.body.work_location || null,
         work_description: req.body.work_description || null,
@@ -135,7 +135,7 @@ const TbmController = {
     try {
       const assignmentData = {
         session_id: req.params.sessionId,
-        worker_id: req.body.worker_id,
+        user_id: req.body.user_id,
         assigned_role: req.body.assigned_role || null,
         work_detail: req.body.work_detail || null,
         is_present: req.body.is_present,
@@ -148,7 +148,7 @@ const TbmController = {
         work_hours: req.body.work_hours !== undefined ? req.body.work_hours : undefined
       };
 
-      if (!assignmentData.worker_id) {
+      if (!assignmentData.user_id) {
         return res.status(400).json({ success: false, message: '작업자 ID가 필요합니다.' });
       }
 
@@ -164,7 +164,7 @@ const TbmController = {
     try {
       const assignmentData = {
         session_id: req.params.sessionId,
-        worker_id: req.body.worker_id,
+        user_id: req.body.user_id,
         work_hours: req.body.work_hours,
         project_id: req.body.project_id || null,
         work_type_id: req.body.work_type_id || null,
@@ -173,7 +173,7 @@ const TbmController = {
         workplace_id: req.body.workplace_id || null
       };
 
-      if (!assignmentData.worker_id || !assignmentData.work_hours) {
+      if (!assignmentData.user_id || !assignmentData.work_hours) {
         return res.status(400).json({ success: false, message: '작업자 ID와 작업시간이 필요합니다.' });
       }
 
@@ -218,8 +218,8 @@ const TbmController = {
 
   removeTeamMember: async (req, res) => {
     try {
-      const { sessionId, workerId } = req.params;
-      const result = await TbmModel.removeTeamMember(sessionId, workerId);
+      const { sessionId, userId } = req.params;
+      const result = await TbmModel.removeTeamMember(sessionId, userId);
 
       if (result.affectedRows === 0) {
         return res.status(404).json({ success: false, message: '팀원을 찾을 수 없습니다.' });
@@ -432,17 +432,17 @@ const TbmController = {
     try {
       const handoverData = {
         session_id: req.body.session_id,
-        from_leader_id: req.body.from_leader_id,
-        to_leader_id: req.body.to_leader_id,
+        from_leader_user_id: req.body.from_leader_user_id,
+        to_leader_user_id: req.body.to_leader_user_id,
         handover_date: req.body.handover_date,
         handover_time: req.body.handover_time || null,
         reason: req.body.reason,
         handover_notes: req.body.handover_notes || null,
-        worker_ids: req.body.worker_ids || []
+        user_ids: req.body.user_ids || []
       };
 
-      if (!handoverData.session_id || !handoverData.from_leader_id ||
-          !handoverData.to_leader_id || !handoverData.handover_date || !handoverData.reason) {
+      if (!handoverData.session_id || !handoverData.from_leader_user_id ||
+          !handoverData.to_leader_user_id || !handoverData.handover_date || !handoverData.reason) {
         return res.status(400).json({ success: false, message: '필수 정보가 누락되었습니다.' });
       }
 
@@ -483,7 +483,7 @@ const TbmController = {
 
   getMyPendingHandovers: async (req, res) => {
     try {
-      const toLeaderId = req.user.worker_id;
+      const toLeaderId = req.user.user_id;
       if (!toLeaderId) {
         return res.status(400).json({ success: false, message: '작업자 정보를 찾을 수 없습니다.' });
       }
@@ -532,10 +532,10 @@ const TbmController = {
 
   createTransfer: async (req, res) => {
     try {
-      const { transfer_type, worker_id, source_session_id, dest_session_id, hours,
+      const { transfer_type, user_id, source_session_id, dest_session_id, hours,
               project_id, work_type_id, task_id, workplace_category_id, workplace_id } = req.body;
 
-      if (!transfer_type || !worker_id || !source_session_id || !dest_session_id || !hours) {
+      if (!transfer_type || !user_id || !source_session_id || !dest_session_id || !hours) {
         return res.status(400).json({ success: false, message: '필수 정보가 누락되었습니다.' });
       }
 
@@ -545,7 +545,7 @@ const TbmController = {
         String(today.getDate()).padStart(2, '0');
 
       const transferData = {
-        transfer_type, worker_id, source_session_id, dest_session_id,
+        transfer_type, user_id, source_session_id, dest_session_id,
         hours, initiated_by: req.user.user_id, transfer_date: transferDate,
         project_id, work_type_id, task_id, workplace_category_id, workplace_id
       };
diff --git a/system1-factory/api/controllers/vacationBalanceController.js b/system1-factory/api/controllers/vacationBalanceController.js
index 2231dc7..420e2d7 100644
--- a/system1-factory/api/controllers/vacationBalanceController.js
+++ b/system1-factory/api/controllers/vacationBalanceController.js
@@ -10,12 +10,12 @@ const logger = require('../utils/logger');
 const vacationBalanceController = {
   /**
    * 특정 작업자의 휴가 잔액 조회 (특정 연도)
-   * GET /api/vacation-balances/worker/:workerId/year/:year
+   * GET /api/vacation-balances/user/:userId/year/:year
    */
   async getByWorkerAndYear(req, res) {
     try {
-      const { workerId, year } = req.params;
-      const results = await vacationBalanceModel.getByWorkerAndYear(workerId, year);
+      const { userId, year } = req.params;
+      const results = await vacationBalanceModel.getByWorkerAndYear(userId, year);
       res.json({ success: true, data: results });
     } catch (error) {
       logger.error('휴가 잔액 조회 오류:', error);
@@ -44,18 +44,18 @@ const vacationBalanceController = {
    */
   async createBalance(req, res) {
     try {
-      const { worker_id, vacation_type_id, year, total_days, used_days, notes } = req.body;
+      const { user_id, vacation_type_id, year, total_days, used_days, notes } = req.body;
       const created_by = req.user.user_id;
 
-      if (!worker_id || !vacation_type_id || !year || total_days === undefined) {
+      if (!user_id || !vacation_type_id || !year || total_days === undefined) {
         return res.status(400).json({
           success: false,
-          message: '필수 필드가 누락되었습니다 (worker_id, vacation_type_id, year, total_days)'
+          message: '필수 필드가 누락되었습니다 (user_id, vacation_type_id, year, total_days)'
         });
       }
 
       // 중복 체크
-      const existing = await vacationBalanceModel.getByWorkerTypeYear(worker_id, vacation_type_id, year);
+      const existing = await vacationBalanceModel.getByWorkerTypeYear(user_id, vacation_type_id, year);
       if (existing && existing.length > 0) {
         return res.status(400).json({
           success: false,
@@ -64,7 +64,7 @@ const vacationBalanceController = {
       }
 
       const balanceData = {
-        worker_id,
+        user_id,
         vacation_type_id,
         year,
         total_days,
@@ -142,13 +142,13 @@ const vacationBalanceController = {
    */
   async autoCalculateAndCreate(req, res) {
     try {
-      const { worker_id, hire_date, year } = req.body;
+      const { user_id, hire_date, year } = req.body;
       const created_by = req.user.user_id;
 
-      if (!worker_id || !hire_date || !year) {
+      if (!user_id || !hire_date || !year) {
         return res.status(400).json({
           success: false,
-          message: '필수 필드가 누락되었습니다 (worker_id, hire_date, year)'
+          message: '필수 필드가 누락되었습니다 (user_id, hire_date, year)'
         });
       }
 
@@ -163,7 +163,7 @@ const vacationBalanceController = {
       const annualTypeId = types[0].id;
 
       // 중복 체크
-      const existing = await vacationBalanceModel.getByWorkerTypeYear(worker_id, annualTypeId, year);
+      const existing = await vacationBalanceModel.getByWorkerTypeYear(user_id, annualTypeId, year);
       if (existing && existing.length > 0) {
         return res.status(400).json({
           success: false,
@@ -172,7 +172,7 @@ const vacationBalanceController = {
       }
 
       const balanceData = {
-        worker_id,
+        user_id,
         vacation_type_id: annualTypeId,
         year,
         total_days: annualDays,
@@ -213,9 +213,9 @@ const vacationBalanceController = {
       let errorCount = 0;
 
       for (const balance of balances) {
-        const { worker_id, vacation_type_id, year, total_days, notes } = balance;
+        const { user_id, vacation_type_id, year, total_days, notes } = balance;
 
-        if (!worker_id || !vacation_type_id || !year || total_days === undefined) {
+        if (!user_id || !vacation_type_id || !year || total_days === undefined) {
           errorCount++;
           continue;
         }
@@ -223,7 +223,7 @@ const vacationBalanceController = {
         try {
           const query = `
             INSERT INTO vacation_balance_details
-              (worker_id, vacation_type_id, year, total_days, used_days, notes, created_by)
+              (user_id, vacation_type_id, year, total_days, used_days, notes, created_by)
             VALUES (?, ?, ?, ?, 0, ?, ?)
             ON DUPLICATE KEY UPDATE
               total_days = VALUES(total_days),
@@ -231,7 +231,7 @@ const vacationBalanceController = {
               updated_at = NOW()
           `;
 
-          await db.query(query, [worker_id, vacation_type_id, year, total_days, notes || null, created_by]);
+          await db.query(query, [user_id, vacation_type_id, year, total_days, notes || null, created_by]);
           successCount++;
         } catch (err) {
           logger.error('휴가 잔액 저장 오류:', err);
@@ -252,12 +252,12 @@ const vacationBalanceController = {
 
   /**
    * 작업자의 사용 가능한 휴가 일수 조회
-   * GET /api/vacation-balances/worker/:workerId/year/:year/available
+   * GET /api/vacation-balances/user/:userId/year/:year/available
    */
   async getAvailableDays(req, res) {
     try {
-      const { workerId, year } = req.params;
-      const results = await vacationBalanceModel.getAvailableVacationDays(workerId, year);
+      const { userId, year } = req.params;
+      const results = await vacationBalanceModel.getAvailableVacationDays(userId, year);
       res.json({ success: true, data: results });
     } catch (error) {
       logger.error('사용 가능 휴가 조회 오류:', error);
diff --git a/system1-factory/api/controllers/vacationRequestController.js b/system1-factory/api/controllers/vacationRequestController.js
index 318af1f..8ec44a7 100644
--- a/system1-factory/api/controllers/vacationRequestController.js
+++ b/system1-factory/api/controllers/vacationRequestController.js
@@ -12,10 +12,10 @@ const vacationRequestController = {
    */
   async createRequest(req, res) {
     try {
-      const { worker_id, vacation_type_id, start_date, end_date, days_used, reason } = req.body;
+      const { user_id, vacation_type_id, start_date, end_date, days_used, reason } = req.body;
       const requested_by = req.user.user_id;
 
-      if (!worker_id || !vacation_type_id || !start_date || !end_date || !days_used) {
+      if (!user_id || !vacation_type_id || !start_date || !end_date || !days_used) {
         return res.status(400).json({ success: false, message: '필수 필드가 누락되었습니다' });
       }
 
@@ -24,13 +24,13 @@ const vacationRequestController = {
       }
 
       // 기간 중복 체크
-      const overlapRows = await vacationRequestModel.checkOverlap(worker_id, start_date, end_date);
+      const overlapRows = await vacationRequestModel.checkOverlap(user_id, start_date, end_date);
       if (overlapRows[0].count > 0) {
         return res.status(400).json({ success: false, message: '해당 기간에 이미 신청된 휴가가 있습니다' });
       }
 
       const result = await vacationRequestModel.create({
-        worker_id, vacation_type_id, start_date, end_date,
+        user_id, vacation_type_id, start_date, end_date,
         days_used, reason: reason || null, status: 'pending', requested_by
       });
 
@@ -51,7 +51,7 @@ const vacationRequestController = {
   async getAllRequests(req, res) {
     try {
       const filters = {
-        worker_id: req.query.worker_id,
+        user_id: req.query.user_id,
         status: req.query.status,
         start_date: req.query.start_date,
         end_date: req.query.end_date,
@@ -60,8 +60,8 @@ const vacationRequestController = {
 
       // 일반 사용자는 자신의 신청만 조회 가능
       if (req.user.access_level !== 'system') {
-        if (req.user.worker_id) {
-          filters.worker_id = req.user.worker_id;
+        if (req.user.user_id) {
+          filters.user_id = req.user.user_id;
         } else {
           return res.status(403).json({ success: false, message: '권한이 없습니다' });
         }
@@ -88,7 +88,7 @@ const vacationRequestController = {
 
       const request = results[0];
 
-      if (req.user.access_level !== 'system' && req.user.worker_id !== request.worker_id) {
+      if (req.user.access_level !== 'system' && req.user.user_id !== request.user_id) {
         return res.status(403).json({ success: false, message: '권한이 없습니다' });
       }
 
@@ -114,7 +114,7 @@ const vacationRequestController = {
 
       const existingRequest = results[0];
 
-      if (req.user.access_level !== 'system' && req.user.worker_id !== existingRequest.worker_id) {
+      if (req.user.access_level !== 'system' && req.user.user_id !== existingRequest.user_id) {
         return res.status(403).json({ success: false, message: '권한이 없습니다' });
       }
 
@@ -134,7 +134,7 @@ const vacationRequestController = {
         const newEndDate = end_date || existingRequest.end_date;
 
         const overlapRows = await vacationRequestModel.checkOverlap(
-          existingRequest.worker_id, newStartDate, newEndDate, id
+          existingRequest.user_id, newStartDate, newEndDate, id
         );
         if (overlapRows[0].count > 0) {
           return res.status(400).json({ success: false, message: '해당 기간에 이미 신청된 휴가가 있습니다' });
@@ -163,7 +163,7 @@ const vacationRequestController = {
 
       const existingRequest = results[0];
 
-      if (req.user.access_level !== 'system' && req.user.worker_id !== existingRequest.worker_id) {
+      if (req.user.access_level !== 'system' && req.user.user_id !== existingRequest.user_id) {
         return res.status(403).json({ success: false, message: '권한이 없습니다' });
       }
 
diff --git a/system1-factory/api/controllers/workAnalysisController.js b/system1-factory/api/controllers/workAnalysisController.js
index 506e003..881a231 100644
--- a/system1-factory/api/controllers/workAnalysisController.js
+++ b/system1-factory/api/controllers/workAnalysisController.js
@@ -353,10 +353,10 @@ const getWorkerSpecialization = asyncHandler(async (req, res) => {
 
     // 작업자별로 그룹화하여 정리
     const groupedData = specializationData.reduce((acc, item) => {
-      if (!acc[item.worker_id]) {
-        acc[item.worker_id] = [];
+      if (!acc[item.user_id]) {
+        acc[item.user_id] = [];
       }
-      acc[item.worker_id].push({
+      acc[item.user_id].push({
         work_type_id: item.work_type_id,
         project_id: item.project_id,
         totalHours: item.totalHours,
diff --git a/system1-factory/api/controllers/workReportAnalysisController.js b/system1-factory/api/controllers/workReportAnalysisController.js
index 2e376ac..32020c1 100644
--- a/system1-factory/api/controllers/workReportAnalysisController.js
+++ b/system1-factory/api/controllers/workReportAnalysisController.js
@@ -31,9 +31,9 @@ const getAnalysisFilters = asyncHandler(async (req, res) => {
 
     // 작업자 목록
     const [workers] = await db.query(`
-      SELECT DISTINCT w.worker_id, w.worker_name
+      SELECT DISTINCT w.user_id, w.worker_name
       FROM workers w
-      INNER JOIN daily_work_reports dwr ON w.worker_id = dwr.worker_id
+      INNER JOIN daily_work_reports dwr ON w.user_id = dwr.user_id
       ORDER BY w.worker_name
     `);
 
@@ -79,7 +79,7 @@ const getAnalysisFilters = asyncHandler(async (req, res) => {
  * 기간별 작업 분석 데이터 조회
  */
 const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
-  const { start_date, end_date, project_id, worker_id } = req.query;
+  const { start_date, end_date, project_id, user_id } = req.query;
 
   if (!start_date || !end_date) {
     throw new ValidationError('start_date와 end_date가 필요합니다', {
@@ -93,7 +93,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
     start_date,
     end_date,
     project_id,
-    worker_id
+    user_id
   });
 
   const db = await getDb();
@@ -108,9 +108,9 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
       queryParams.push(project_id);
     }
 
-    if (worker_id) {
-      whereConditions.push('dwr.worker_id = ?');
-      queryParams.push(worker_id);
+    if (user_id) {
+      whereConditions.push('dwr.user_id = ?');
+      queryParams.push(user_id);
     }
 
     const whereClause = whereConditions.join(' AND ');
@@ -120,7 +120,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
       SELECT
         COUNT(*) as total_entries,
         SUM(dwr.work_hours) as total_hours,
-        COUNT(DISTINCT dwr.worker_id) as unique_workers,
+        COUNT(DISTINCT dwr.user_id) as unique_workers,
         COUNT(DISTINCT dwr.project_id) as unique_projects,
         COUNT(DISTINCT dwr.report_date) as working_days,
         AVG(dwr.work_hours) as avg_hours_per_entry,
@@ -139,7 +139,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
         dwr.report_date,
         SUM(dwr.work_hours) as daily_hours,
         COUNT(*) as daily_entries,
-        COUNT(DISTINCT dwr.worker_id) as daily_workers
+        COUNT(DISTINCT dwr.user_id) as daily_workers
       FROM daily_work_reports dwr
       WHERE ${whereClause}
       GROUP BY dwr.report_date
@@ -202,7 +202,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
     // 6. 작업자별 성과 분석
     const workerAnalysisSql = `
       SELECT
-        w.worker_id,
+        w.user_id,
         w.worker_name,
         COUNT(*) as total_entries,
         SUM(dwr.work_hours) as total_hours,
@@ -212,9 +212,9 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
         COUNT(CASE WHEN dwr.error_type_id IS NOT NULL THEN 1 END) as error_count,
         ROUND((COUNT(CASE WHEN dwr.error_type_id IS NOT NULL THEN 1 END) / COUNT(*)) * 100, 2) as error_rate
       FROM daily_work_reports dwr
-      LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+      LEFT JOIN workers w ON dwr.user_id = w.user_id
       WHERE ${whereClause}
-      GROUP BY w.worker_id, w.worker_name
+      GROUP BY w.user_id, w.worker_name
       ORDER BY total_hours DESC
     `;
 
@@ -227,7 +227,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
         p.project_name,
         COUNT(*) as total_entries,
         SUM(dwr.work_hours) as total_hours,
-        COUNT(DISTINCT dwr.worker_id) as workers_count,
+        COUNT(DISTINCT dwr.user_id) as workers_count,
         COUNT(DISTINCT dwr.report_date) as working_days,
         AVG(dwr.work_hours) as avg_hours_per_entry,
         COUNT(CASE WHEN dwr.error_type_id IS NOT NULL THEN 1 END) as error_count,
@@ -259,7 +259,7 @@ const getAnalyticsByPeriod = asyncHandler(async (req, res) => {
         workerAnalysis,
         projectAnalysis,
         period: { start_date, end_date },
-        filters: { project_id, worker_id }
+        filters: { project_id, user_id }
       },
       message: '기간별 분석 데이터 조회 성공'
     });
@@ -311,7 +311,7 @@ const getProjectAnalysis = asyncHandler(async (req, res) => {
         p.project_name,
         SUM(dwr.work_hours) as total_hours,
         COUNT(*) as total_entries,
-        COUNT(DISTINCT dwr.worker_id) as workers_count,
+        COUNT(DISTINCT dwr.user_id) as workers_count,
         COUNT(DISTINCT dwr.report_date) as working_days,
         AVG(dwr.work_hours) as avg_hours_per_entry
       FROM daily_work_reports dwr
@@ -351,7 +351,7 @@ const getProjectAnalysis = asyncHandler(async (req, res) => {
  * 작업자별 상세 분석
  */
 const getWorkerAnalysis = asyncHandler(async (req, res) => {
-  const { start_date, end_date, worker_id } = req.query;
+  const { start_date, end_date, user_id } = req.query;
 
   if (!start_date || !end_date) {
     throw new ValidationError('start_date와 end_date가 필요합니다', {
@@ -363,7 +363,7 @@ const getWorkerAnalysis = asyncHandler(async (req, res) => {
   logger.info('작업자별 분석 조회 요청', {
     start_date,
     end_date,
-    worker_id
+    user_id
   });
 
   const db = await getDb();
@@ -372,16 +372,16 @@ const getWorkerAnalysis = asyncHandler(async (req, res) => {
     let whereConditions = ['dwr.report_date BETWEEN ? AND ?'];
     let queryParams = [start_date, end_date];
 
-    if (worker_id) {
-      whereConditions.push('dwr.worker_id = ?');
-      queryParams.push(worker_id);
+    if (user_id) {
+      whereConditions.push('dwr.user_id = ?');
+      queryParams.push(user_id);
     }
 
     const whereClause = whereConditions.join(' AND ');
 
     const workerStatsSql = `
       SELECT
-        dwr.worker_id,
+        dwr.user_id,
         w.worker_name,
         SUM(dwr.work_hours) as total_hours,
         COUNT(*) as total_entries,
@@ -389,9 +389,9 @@ const getWorkerAnalysis = asyncHandler(async (req, res) => {
         COUNT(DISTINCT dwr.report_date) as working_days,
         AVG(dwr.work_hours) as avg_hours_per_entry
       FROM daily_work_reports dwr
-      LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+      LEFT JOIN workers w ON dwr.user_id = w.user_id
       WHERE ${whereClause}
-      GROUP BY dwr.worker_id
+      GROUP BY dwr.user_id
       ORDER BY total_hours DESC
     `;
 
diff --git a/system1-factory/api/controllers/workerController.js b/system1-factory/api/controllers/workerController.js
index e71332b..18c745f 100644
--- a/system1-factory/api/controllers/workerController.js
+++ b/system1-factory/api/controllers/workerController.js
@@ -103,7 +103,7 @@ exports.getAllWorkers = asyncHandler(async (req, res) => {
  * 단일 작업자 조회
  */
 exports.getWorkerById = asyncHandler(async (req, res) => {
-  const id = parseInt(req.params.worker_id, 10);
+  const id = parseInt(req.params.user_id, 10);
 
   if (isNaN(id)) {
     throw new ValidationError('유효하지 않은 작업자 ID입니다');
@@ -126,7 +126,7 @@ exports.getWorkerById = asyncHandler(async (req, res) => {
  * 작업자 수정
  */
 exports.updateWorker = asyncHandler(async (req, res) => {
-  const id = parseInt(req.params.worker_id, 10);
+  const id = parseInt(req.params.user_id, 10);
 
   if (isNaN(id)) {
     throw new ValidationError('유효하지 않은 작업자 ID입니다');
@@ -252,7 +252,7 @@ exports.updateWorker = asyncHandler(async (req, res) => {
  * 작업자 삭제
  */
 exports.removeWorker = asyncHandler(async (req, res) => {
-  const id = parseInt(req.params.worker_id, 10);
+  const id = parseInt(req.params.user_id, 10);
 
   if (isNaN(id)) {
     throw new ValidationError('유효하지 않은 작업자 ID입니다');
diff --git a/system1-factory/api/db/migrations/20260305000001_worker_id_to_user_id_migration.js b/system1-factory/api/db/migrations/20260305000001_worker_id_to_user_id_migration.js
new file mode 100644
index 0000000..f5c675a
--- /dev/null
+++ b/system1-factory/api/db/migrations/20260305000001_worker_id_to_user_id_migration.js
@@ -0,0 +1,233 @@
+/**
+ * worker_id → user_id 통합 마이그레이션 (Phase 1)
+ *
+ * 비파괴적 추가: 기존 worker_id 컬럼은 유지하면서 user_id 컬럼을 추가하고 백필.
+ * 코드 변경 전이므로 기존 시스템 동작에 영향 없음.
+ *
+ * 대상 테이블:
+ *   1. departments - is_production 플래그 추가
+ *   2. sso_users - department_id 추가 (없는 경우)
+ *   3. workers - user_id 추가 + 매핑 백필
+ *   4~15. 12개 참조 테이블 - user_id 추가 + 백필
+ *
+ * @since 2026-03-05
+ */
+
+exports.up = async function(knex) {
+  // ============================================================
+  // 1. departments 테이블에 is_production 플래그 추가
+  // ============================================================
+  const hasIsProduction = await knex.schema.hasColumn('departments', 'is_production');
+  if (!hasIsProduction) {
+    await knex.schema.table('departments', (table) => {
+      table.boolean('is_production').defaultTo(false).comment('생산직 부서 여부');
+    });
+    await knex.raw(`UPDATE departments SET is_production = TRUE WHERE department_name LIKE '%생산%'`);
+    console.log('✅ departments.is_production 추가 완료');
+  }
+
+  // ============================================================
+  // 2. sso_users에 department_id 추가 (없는 경우)
+  // ============================================================
+  const hasSsoDeptId = await knex.schema.hasColumn('sso_users', 'department_id');
+  if (!hasSsoDeptId) {
+    await knex.schema.table('sso_users', (table) => {
+      table.integer('department_id').unsigned().defaultTo(null).comment('소속 부서 ID');
+    });
+    // 기존 department(문자열) → department_id(FK) 매핑
+    await knex.raw(`
+      UPDATE sso_users s
+      INNER JOIN departments d ON s.department = d.department_name
+      SET s.department_id = d.department_id
+      WHERE s.department IS NOT NULL
+    `);
+    console.log('✅ sso_users.department_id 추가 및 백필 완료');
+  }
+
+  // ============================================================
+  // 3. workers 테이블에 user_id 추가 + 매핑 백필
+  // ============================================================
+  const hasWorkersUserId = await knex.schema.hasColumn('workers', 'user_id');
+  if (!hasWorkersUserId) {
+    await knex.schema.table('workers', (table) => {
+      table.integer('user_id').unsigned().defaultTo(null).after('worker_id')
+        .comment('sso_users.user_id 매핑');
+    });
+    // users 테이블을 경유하여 sso_users.user_id 매핑
+    await knex.raw(`
+      UPDATE workers w
+      INNER JOIN users u ON u.worker_id = w.worker_id
+      INNER JOIN sso_users s ON s.username = u.username
+      SET w.user_id = s.user_id
+    `);
+    // user_id에 인덱스 추가
+    await knex.raw(`ALTER TABLE workers ADD INDEX idx_workers_user_id (user_id)`);
+    console.log('✅ workers.user_id 추가 및 백필 완료');
+  }
+
+  // ============================================================
+  // 4~15. 12개 참조 테이블에 user_id 컬럼 추가 + 백필
+  // ============================================================
+
+  // worker_id 컬럼을 가진 테이블들
+  const tablesWithWorkerId = [
+    'tbm_team_assignments',
+    'tbm_transfers',
+    'daily_work_reports',
+    'daily_attendance_records',
+    'worker_vacation_balance',
+    'vacation_requests',
+    'vacation_balance_details',
+    'worker_groups',
+    'monthly_worker_status',
+  ];
+
+  for (const tableName of tablesWithWorkerId) {
+    const tableExists = await knex.schema.hasTable(tableName);
+    if (!tableExists) {
+      console.log(`⏭️  ${tableName} 테이블이 존재하지 않음, 건너뜀`);
+      continue;
+    }
+
+    const hasUserId = await knex.schema.hasColumn(tableName, 'user_id');
+    if (!hasUserId) {
+      await knex.schema.table(tableName, (table) => {
+        table.integer('user_id').unsigned().defaultTo(null).comment('sso_users.user_id');
+      });
+      // 백필: workers 테이블의 user_id 매핑 사용
+      await knex.raw(`
+        UPDATE ${tableName} t
+        INNER JOIN workers w ON t.worker_id = w.worker_id
+        SET t.user_id = w.user_id
+        WHERE w.user_id IS NOT NULL
+      `);
+      // 인덱스 추가
+      await knex.raw(`ALTER TABLE ${tableName} ADD INDEX idx_${tableName}_user_id (user_id)`);
+      console.log(`✅ ${tableName}.user_id 추가 및 백필 완료`);
+    }
+  }
+
+  // DailyIssueReports (대소문자 다른 테이블명)
+  const hasDIR = await knex.schema.hasTable('DailyIssueReports');
+  if (hasDIR) {
+    const hasDIRUserId = await knex.schema.hasColumn('DailyIssueReports', 'user_id');
+    if (!hasDIRUserId) {
+      await knex.schema.table('DailyIssueReports', (table) => {
+        table.integer('user_id').unsigned().defaultTo(null).comment('sso_users.user_id');
+      });
+      await knex.raw(`
+        UPDATE DailyIssueReports t
+        INNER JOIN workers w ON t.worker_id = w.worker_id
+        SET t.user_id = w.user_id
+        WHERE w.user_id IS NOT NULL
+      `);
+      console.log('✅ DailyIssueReports.user_id 추가 및 백필 완료');
+    }
+  }
+
+  // WorkReports (대소문자 다른 테이블명)
+  const hasWR = await knex.schema.hasTable('WorkReports');
+  if (hasWR) {
+    const hasWRUserId = await knex.schema.hasColumn('WorkReports', 'user_id');
+    if (!hasWRUserId) {
+      await knex.schema.table('WorkReports', (table) => {
+        table.integer('user_id').unsigned().defaultTo(null).comment('sso_users.user_id');
+      });
+      await knex.raw(`
+        UPDATE WorkReports t
+        INNER JOIN workers w ON t.worker_id = w.worker_id
+        SET t.user_id = w.user_id
+        WHERE w.user_id IS NOT NULL
+      `);
+      console.log('✅ WorkReports.user_id 추가 및 백필 완료');
+    }
+  }
+
+  // tbm_sessions: leader_id → leader_user_id 추가
+  const hasLeaderUserId = await knex.schema.hasColumn('tbm_sessions', 'leader_user_id');
+  if (!hasLeaderUserId) {
+    await knex.schema.table('tbm_sessions', (table) => {
+      table.integer('leader_user_id').unsigned().defaultTo(null).comment('조장 sso_users.user_id');
+    });
+    await knex.raw(`
+      UPDATE tbm_sessions t
+      INNER JOIN workers w ON t.leader_id = w.worker_id
+      SET t.leader_user_id = w.user_id
+      WHERE w.user_id IS NOT NULL
+    `);
+    await knex.raw(`ALTER TABLE tbm_sessions ADD INDEX idx_tbm_sessions_leader_user_id (leader_user_id)`);
+    console.log('✅ tbm_sessions.leader_user_id 추가 및 백필 완료');
+  }
+
+  // team_handovers: from/to_leader_id → from/to_leader_user_id 추가
+  const hasFromLeaderUserId = await knex.schema.hasColumn('team_handovers', 'from_leader_user_id');
+  if (!hasFromLeaderUserId) {
+    await knex.schema.table('team_handovers', (table) => {
+      table.integer('from_leader_user_id').unsigned().defaultTo(null).comment('인계자 sso_users.user_id');
+      table.integer('to_leader_user_id').unsigned().defaultTo(null).comment('인수자 sso_users.user_id');
+    });
+    await knex.raw(`
+      UPDATE team_handovers t
+      INNER JOIN workers w1 ON t.from_leader_id = w1.worker_id
+      SET t.from_leader_user_id = w1.user_id
+      WHERE w1.user_id IS NOT NULL
+    `);
+    await knex.raw(`
+      UPDATE team_handovers t
+      INNER JOIN workers w2 ON t.to_leader_id = w2.worker_id
+      SET t.to_leader_user_id = w2.user_id
+      WHERE w2.user_id IS NOT NULL
+    `);
+    console.log('✅ team_handovers.from/to_leader_user_id 추가 및 백필 완료');
+  }
+
+  console.log('🎉 Phase 1 마이그레이션 완료: 모든 테이블에 user_id 컬럼 추가 및 백필 완료');
+};
+
+exports.down = async function(knex) {
+  // user_id 컬럼 제거 (롤백)
+  const columnsToRemove = [
+    ['departments', 'is_production'],
+    ['workers', 'user_id'],
+    ['tbm_team_assignments', 'user_id'],
+    ['tbm_transfers', 'user_id'],
+    ['daily_work_reports', 'user_id'],
+    ['daily_attendance_records', 'user_id'],
+    ['worker_vacation_balance', 'user_id'],
+    ['vacation_requests', 'user_id'],
+    ['vacation_balance_details', 'user_id'],
+    ['worker_groups', 'user_id'],
+    ['monthly_worker_status', 'user_id'],
+    ['tbm_sessions', 'leader_user_id'],
+    ['team_handovers', 'from_leader_user_id'],
+    ['team_handovers', 'to_leader_user_id'],
+  ];
+
+  for (const [tableName, columnName] of columnsToRemove) {
+    const tableExists = await knex.schema.hasTable(tableName);
+    if (!tableExists) continue;
+    const hasColumn = await knex.schema.hasColumn(tableName, columnName);
+    if (hasColumn) {
+      await knex.schema.table(tableName, (table) => {
+        table.dropColumn(columnName);
+      });
+      console.log(`↩️  ${tableName}.${columnName} 제거`);
+    }
+  }
+
+  // 대소문자 다른 테이블
+  for (const tableName of ['DailyIssueReports', 'WorkReports']) {
+    const tableExists = await knex.schema.hasTable(tableName);
+    if (tableExists) {
+      const hasColumn = await knex.schema.hasColumn(tableName, 'user_id');
+      if (hasColumn) {
+        await knex.schema.table(tableName, (table) => {
+          table.dropColumn('user_id');
+        });
+        console.log(`↩️  ${tableName}.user_id 제거`);
+      }
+    }
+  }
+
+  // sso_users.department_id는 유지 (다른 마이그레이션에서 관리)
+};
diff --git a/system1-factory/api/db/migrations/20260205_fix_work_type_id_data.js b/system1-factory/api/db/scripts/20260205_fix_work_type_id_data.js
similarity index 100%
rename from system1-factory/api/db/migrations/20260205_fix_work_type_id_data.js
rename to system1-factory/api/db/scripts/20260205_fix_work_type_id_data.js
diff --git a/system1-factory/api/middlewares/auth.js b/system1-factory/api/middlewares/auth.js
index 990fecf..a9d1257 100644
--- a/system1-factory/api/middlewares/auth.js
+++ b/system1-factory/api/middlewares/auth.js
@@ -229,7 +229,7 @@ const requireMinLevel = (minLevel) => {
  * requireAuth 미들웨어가 먼저 실행되어야 합니다.
  *
  * @param {Object} options - 옵션 객체
- * @param {string} options.resourceField - 리소스 ID를 가져올 req 필드 (예: 'params.user_id', 'body.worker_id')
+ * @param {string} options.resourceField - 리소스 ID를 가져올 req 필드 (예: 'params.user_id', 'body.user_id')
  * @param {string} options.userField - 사용자 ID 필드명 (기본값: 'user_id', 'id'도 자동 시도)
  * @param {string[]} options.adminRoles - 관리자로 인정할 역할들 (기본값: ['admin', 'system'])
  * @returns {Function} Express 미들웨어 함수
@@ -242,9 +242,9 @@ const requireMinLevel = (minLevel) => {
  *   resourceField: 'params.user_id'
  * }), updateUser);
  *
- * // 요청 body의 worker_id로 체크, support_team도 관리자로 인정
+ * // 요청 body의 user_id로 체크, support_team도 관리자로 인정
  * router.delete('/reports/:id', requireAuth, requireOwnerOrAdmin({
- *   resourceField: 'body.worker_id',
+ *   resourceField: 'body.user_id',
  *   adminRoles: ['admin', 'system', 'support_team']
  * }), deleteReport);
  */
diff --git a/system1-factory/api/models/WorkAnalysis.js b/system1-factory/api/models/WorkAnalysis.js
index 8513ace..0fd7920 100644
--- a/system1-factory/api/models/WorkAnalysis.js
+++ b/system1-factory/api/models/WorkAnalysis.js
@@ -12,7 +12,7 @@ class WorkAnalysis {
                 COALESCE(SUM(work_hours), 0) as total_hours,
                 COUNT(*) as total_reports,
                 COUNT(DISTINCT project_id) as active_projects,
-                COUNT(DISTINCT worker_id) as active_workers,
+                COUNT(DISTINCT user_id) as active_workers,
                 SUM(CASE WHEN work_status_id = 2 THEN 1 ELSE 0 END) as error_reports,
                 ROUND(AVG(work_hours), 2) as avg_hours_per_report
             FROM daily_work_reports 
@@ -47,7 +47,7 @@ class WorkAnalysis {
                 report_date as date,
                 SUM(work_hours) as hours,
                 COUNT(*) as reports,
-                COUNT(DISTINCT worker_id) as workers,
+                COUNT(DISTINCT user_id) as workers,
                 SUM(CASE WHEN work_status_id = 2 THEN 1 ELSE 0 END) as errors
             FROM daily_work_reports 
             WHERE report_date BETWEEN ? AND ?
@@ -73,7 +73,7 @@ class WorkAnalysis {
     async getWorkerStats(startDate, endDate) {
         const query = `
             SELECT 
-                dwr.worker_id,
+                dwr.user_id,
                 w.worker_name,
                 SUM(dwr.work_hours) as totalHours,
                 COUNT(*) as totalReports,
@@ -82,17 +82,17 @@ class WorkAnalysis {
                 SUM(CASE WHEN dwr.work_status_id = 2 THEN 1 ELSE 0 END) as errorCount,
                 COUNT(DISTINCT dwr.report_date) as workingDays
             FROM daily_work_reports dwr
-            LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+            LEFT JOIN workers w ON dwr.user_id = w.user_id
             WHERE dwr.report_date BETWEEN ? AND ?
-            GROUP BY dwr.worker_id, w.worker_name
+            GROUP BY dwr.user_id, w.worker_name
             ORDER BY totalHours DESC
         `;
 
         try {
             const [results] = await this.db.execute(query, [startDate, endDate]);
             return results.map(row => ({
-                worker_id: row.worker_id,
-                worker_name: row.worker_name || `작업자 ${row.worker_id}`,
+                user_id: row.user_id,
+                worker_name: row.worker_name || `작업자 ${row.user_id}`,
                 totalHours: parseFloat(row.totalHours) || 0,
                 totalReports: parseInt(row.totalReports) || 0,
                 avgHours: parseFloat(row.avgHours) || 0,
@@ -114,7 +114,7 @@ class WorkAnalysis {
                 p.project_name,
                 SUM(dwr.work_hours) as totalHours,
                 COUNT(*) as totalReports,
-                COUNT(DISTINCT dwr.worker_id) as workerCount,
+                COUNT(DISTINCT dwr.user_id) as workerCount,
                 ROUND(AVG(dwr.work_hours), 2) as avgHours,
                 SUM(CASE WHEN dwr.work_status_id = 2 THEN 1 ELSE 0 END) as errorCount,
                 COUNT(DISTINCT dwr.report_date) as activeDays
@@ -152,7 +152,7 @@ class WorkAnalysis {
                 SUM(dwr.work_hours) as totalHours,
                 COUNT(*) as totalReports,
                 ROUND(AVG(dwr.work_hours), 2) as avgHours,
-                COUNT(DISTINCT dwr.worker_id) as workerCount,
+                COUNT(DISTINCT dwr.user_id) as workerCount,
                 SUM(CASE WHEN dwr.work_status_id = 2 THEN 1 ELSE 0 END) as errorCount,
                 COUNT(DISTINCT dwr.project_id) as projectCount
             FROM daily_work_reports dwr
@@ -190,7 +190,7 @@ class WorkAnalysis {
             SELECT
                 dwr.id,
                 dwr.report_date,
-                dwr.worker_id,
+                dwr.user_id,
                 w.worker_name,
                 dwr.project_id,
                 p.project_name,
@@ -215,7 +215,7 @@ class WorkAnalysis {
                 u.name as created_by_name,
                 dwr.created_at
             FROM daily_work_reports dwr
-            LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+            LEFT JOIN workers w ON dwr.user_id = w.user_id
             LEFT JOIN projects p ON dwr.project_id = p.project_id
             LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
             LEFT JOIN tasks t ON dwr.work_type_id = t.task_id
@@ -234,8 +234,8 @@ class WorkAnalysis {
             return results.map(row => ({
                 id: row.id,
                 report_date: row.report_date,
-                worker_id: row.worker_id,
-                worker_name: row.worker_name || `작업자 ${row.worker_id}`,
+                user_id: row.user_id,
+                worker_name: row.worker_name || `작업자 ${row.user_id}`,
                 project_id: row.project_id,
                 project_name: row.project_name || `프로젝트 ${row.project_id}`,
                 job_no: row.job_no || 'N/A',
@@ -274,7 +274,7 @@ class WorkAnalysis {
                 SUM(work_hours) as total_hours,
                 COUNT(*) as total_reports,
                 ROUND(AVG(work_hours), 2) as avg_hours,
-                COUNT(DISTINCT worker_id) as active_workers
+                COUNT(DISTINCT user_id) as active_workers
             FROM daily_work_reports
             WHERE report_date BETWEEN ? AND ?
             GROUP BY DAYOFWEEK(report_date)
@@ -306,7 +306,7 @@ class WorkAnalysis {
                 irc.category_name as error_category_name,
                 COUNT(*) as error_count,
                 SUM(dwr.work_hours) as total_hours,
-                COUNT(DISTINCT dwr.worker_id) as affected_workers,
+                COUNT(DISTINCT dwr.user_id) as affected_workers,
                 COUNT(DISTINCT dwr.project_id) as affected_projects
             FROM daily_work_reports dwr
             LEFT JOIN issue_report_items iri ON dwr.error_type_id = iri.item_id
@@ -341,7 +341,7 @@ class WorkAnalysis {
                 MONTHNAME(report_date) as month_name,
                 SUM(work_hours) as total_hours,
                 COUNT(*) as total_reports,
-                COUNT(DISTINCT worker_id) as active_workers,
+                COUNT(DISTINCT user_id) as active_workers,
                 COUNT(DISTINCT project_id) as active_projects,
                 SUM(CASE WHEN work_status_id = 2 THEN 1 ELSE 0 END) as error_count
             FROM daily_work_reports
@@ -371,7 +371,7 @@ class WorkAnalysis {
     async getWorkerSpecialization(startDate, endDate) {
         const query = `
             SELECT 
-                dwr.worker_id,
+                dwr.user_id,
                 w.worker_name,
                 dwr.work_type_id,
                 wt.name as work_type_name,
@@ -382,24 +382,24 @@ class WorkAnalysis {
                 ROUND((SUM(dwr.work_hours) / (
                     SELECT SUM(work_hours) 
                     FROM daily_work_reports 
-                    WHERE worker_id = dwr.worker_id 
+                    WHERE user_id = dwr.user_id 
                     AND report_date BETWEEN ? AND ?
                 )) * 100, 2) as percentage
             FROM daily_work_reports dwr
-            LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+            LEFT JOIN workers w ON dwr.user_id = w.user_id
             LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
             LEFT JOIN projects p ON dwr.project_id = p.project_id
             WHERE dwr.report_date BETWEEN ? AND ?
-            GROUP BY dwr.worker_id, w.worker_name, dwr.work_type_id, wt.name, dwr.project_id, p.project_name
+            GROUP BY dwr.user_id, w.worker_name, dwr.work_type_id, wt.name, dwr.project_id, p.project_name
             HAVING totalHours > 0
-            ORDER BY dwr.worker_id, totalHours DESC
+            ORDER BY dwr.user_id, totalHours DESC
         `;
 
         try {
             const [results] = await this.db.execute(query, [startDate, endDate, startDate, endDate]);
             return results.map(row => ({
-                worker_id: row.worker_id,
-                worker_name: row.worker_name || `작업자 ${row.worker_id}`,
+                user_id: row.user_id,
+                worker_name: row.worker_name || `작업자 ${row.user_id}`,
                 work_type_id: row.work_type_id,
                 work_type_name: row.work_type_name || `작업유형 ${row.work_type_id}`,
                 project_id: row.project_id,
diff --git a/system1-factory/api/models/analysisModel.js b/system1-factory/api/models/analysisModel.js
index c0b5b84..067f3e0 100644
--- a/system1-factory/api/models/analysisModel.js
+++ b/system1-factory/api/models/analysisModel.js
@@ -26,7 +26,7 @@ const getAnalysis = async (startDate, endDate) => {
     const summarySql = `
       SELECT
         COUNT(DISTINCT dwr.project_id) as totalProjects,
-        COUNT(DISTINCT dwr.worker_id) as totalworkers,
+        COUNT(DISTINCT dwr.user_id) as totalworkers,
         COUNT(DISTINCT dwr.task_id) as totalTasks,
         SUM(${workHoursCalc}) as totalHours
       FROM DailyWorkReports dwr
@@ -35,7 +35,7 @@ const getAnalysis = async (startDate, endDate) => {
     
     // 2. 프로젝트별 집계 쿼리
     const byProjectSql = `
-      SELECT p.project_name as name, SUM(${workHoursCalc}) as hours, COUNT(DISTINCT dwr.worker_id) as participants
+      SELECT p.project_name as name, SUM(${workHoursCalc}) as hours, COUNT(DISTINCT dwr.user_id) as participants
       FROM DailyWorkReports dwr
       JOIN projects p ON dwr.project_id = p.project_id
       ${whereClause}
@@ -48,7 +48,7 @@ const getAnalysis = async (startDate, endDate) => {
     const byWorkerSql = `
       SELECT w.worker_name as name, SUM(${workHoursCalc}) as hours, COUNT(DISTINCT dwr.project_id) as participants
       FROM DailyWorkReports dwr
-      JOIN workers w ON dwr.worker_id = w.worker_id
+      JOIN workers w ON dwr.user_id = w.user_id
       ${whereClause}
       GROUP BY w.worker_name
       HAVING hours > 0
@@ -57,7 +57,7 @@ const getAnalysis = async (startDate, endDate) => {
     
     // 4. 작업별 집계 쿼리
     const byTaskSql = `
-      SELECT t.category as name, SUM(${workHoursCalc}) as hours, COUNT(DISTINCT dwr.worker_id) as participants
+      SELECT t.category as name, SUM(${workHoursCalc}) as hours, COUNT(DISTINCT dwr.user_id) as participants
       FROM DailyWorkReports dwr
       JOIN Tasks t ON dwr.task_id = t.task_id
       ${whereClause}
@@ -74,7 +74,7 @@ const getAnalysis = async (startDate, endDate) => {
         (${workHoursCalc}) as work_hours, dwr.memo
       FROM DailyWorkReports dwr
       JOIN projects p ON dwr.project_id = p.project_id
-      JOIN workers w ON dwr.worker_id = w.worker_id
+      JOIN workers w ON dwr.user_id = w.user_id
       JOIN Tasks t ON dwr.task_id = t.task_id
       ${whereClause}
       HAVING work_hours > 0
diff --git a/system1-factory/api/models/attendanceModel.js b/system1-factory/api/models/attendanceModel.js
index a14c411..c7f7761 100644
--- a/system1-factory/api/models/attendanceModel.js
+++ b/system1-factory/api/models/attendanceModel.js
@@ -2,7 +2,7 @@ const { getDb } = require('../dbPool');
 
 class AttendanceModel {
   // 일일 근태 기록 조회
-  static async getDailyAttendanceRecords(date, workerId = null) {
+  static async getDailyAttendanceRecords(date, userId = null) {
     const db = await getDb();
     let query = `
       SELECT
@@ -15,7 +15,7 @@ class AttendanceModel {
         vt.type_code as vacation_type_code,
         vt.deduct_days as vacation_days
       FROM daily_attendance_records dar
-      LEFT JOIN workers w ON dar.worker_id = w.worker_id
+      LEFT JOIN workers w ON dar.user_id = w.user_id
       LEFT JOIN work_attendance_types wat ON dar.attendance_type_id = wat.id
       LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
       WHERE dar.record_date = ?
@@ -23,9 +23,9 @@ class AttendanceModel {
 
     const params = [date];
 
-    if (workerId) {
-      query += ' AND dar.worker_id = ?';
-      params.push(workerId);
+    if (userId) {
+      query += ' AND dar.user_id = ?';
+      params.push(userId);
     }
 
     query += ' ORDER BY w.worker_name';
@@ -35,7 +35,7 @@ class AttendanceModel {
   }
 
   // 기간별 근태 기록 조회 (월별 조회용)
-  static async getDailyRecords(startDate, endDate, workerId = null) {
+  static async getDailyRecords(startDate, endDate, userId = null) {
     const db = await getDb();
     let query = `
       SELECT
@@ -48,7 +48,7 @@ class AttendanceModel {
         vt.type_code as vacation_type_code,
         vt.deduct_days as vacation_days
       FROM daily_attendance_records dar
-      LEFT JOIN workers w ON dar.worker_id = w.worker_id
+      LEFT JOIN workers w ON dar.user_id = w.user_id
       LEFT JOIN work_attendance_types wat ON dar.attendance_type_id = wat.id
       LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
       WHERE dar.record_date BETWEEN ? AND ?
@@ -56,9 +56,9 @@ class AttendanceModel {
 
     const params = [startDate, endDate];
 
-    if (workerId) {
-      query += ' AND dar.worker_id = ?';
-      params.push(workerId);
+    if (userId) {
+      query += ' AND dar.user_id = ?';
+      params.push(userId);
     }
 
     query += ' ORDER BY dar.record_date ASC';
@@ -68,17 +68,17 @@ class AttendanceModel {
   }
 
   // 작업 보고서와 근태 기록 동기화 (시간 합산 및 상태 업데이트)
-  static async syncWithWorkReports(workerId, date) {
+  static async syncWithWorkReports(userId, date) {
     const db = await getDb();
 
     // 1. 해당 날짜의 총 작업 시간 계산
     const [reportStats] = await db.execute(`
-      SELECT 
+      SELECT
         COALESCE(SUM(work_hours), 0) as total_hours,
         COUNT(*) as report_count
       FROM daily_work_reports
-      WHERE worker_id = ? AND report_date = ?
-    `, [workerId, date]);
+      WHERE user_id = ? AND report_date = ?
+    `, [userId, date]);
 
     const totalHours = parseFloat(reportStats[0].total_hours || 0);
     const reportCount = reportStats[0].report_count;
@@ -110,8 +110,8 @@ class AttendanceModel {
     // 3. 기록 업데이트 (휴가 정보는 유지)
     // 기존 기록 조회
     const [existing] = await db.execute(
-      'SELECT id, vacation_type_id FROM daily_attendance_records WHERE worker_id = ? AND record_date = ?',
-      [workerId, date]
+      'SELECT id, vacation_type_id FROM daily_attendance_records WHERE user_id = ? AND record_date = ?',
+      [userId, date]
     );
 
     if (existing.length > 0) {
@@ -138,9 +138,9 @@ class AttendanceModel {
       // 생성자가 명확하지 않으므로 시스템(1) 또는 알 수 없음 처리
       await db.execute(`
         INSERT INTO daily_attendance_records
-        (record_date, worker_id, total_work_hours, attendance_type_id, status, created_by)
+        (record_date, user_id, total_work_hours, attendance_type_id, status, created_by)
         VALUES (?, ?, ?, ?, ?, 1)
-      `, [date, workerId, totalHours, typeId, status]);
+      `, [date, userId, totalHours, typeId, status]);
 
       return { synced: true, totalHours, status, created: true };
     }
@@ -152,14 +152,14 @@ class AttendanceModel {
 
     // 1. 활성 작업자 조회
     const [workers] = await db.execute(
-      'SELECT worker_id FROM workers WHERE status = "active"' // is_active check not needed as status covers it based on previous fix? Wait, previous fix used status='active'.
+      'SELECT user_id FROM workers WHERE status = "active" AND user_id IS NOT NULL'
     );
 
     if (workers.length === 0) return { inserted: 0 };
 
     // 2. 일일 근태 레코드 일괄 생성 (이미 존재하면 무시)
     // VALUES (...), (...), ...
-    const values = workers.map(w => [date, w.worker_id, 'incomplete', createdBy]);
+    const values = workers.map(w => [date, w.user_id, 'incomplete', createdBy]);
 
     // Bulk INSERT IGNORE
     // Note: mysql2 execute doesn't support nested arrays for bulk insert easily with placeholder ?
@@ -175,10 +175,10 @@ class AttendanceModel {
 
       for (const w of workers) {
         const [result] = await conn.execute(`
-          INSERT IGNORE INTO daily_attendance_records 
-          (record_date, worker_id, status, created_by)
+          INSERT IGNORE INTO daily_attendance_records
+          (record_date, user_id, status, created_by)
           VALUES (?, ?, 'incomplete', ?)
-        `, [date, w.worker_id, createdBy]);
+        `, [date, w.user_id, createdBy]);
 
         insertedCount += result.affectedRows;
       }
@@ -200,7 +200,7 @@ class AttendanceModel {
 
     const {
       record_date,
-      worker_id,
+      user_id,
       total_work_hours = 8,
       work_attendance_type_id = 1,
       vacation_type_id = null,
@@ -212,8 +212,8 @@ class AttendanceModel {
 
     // 기존 기록 확인
     const [existing] = await db.execute(
-      'SELECT id FROM daily_attendance_records WHERE worker_id = ? AND record_date = ?',
-      [worker_id, record_date]
+      'SELECT id FROM daily_attendance_records WHERE user_id = ? AND record_date = ?',
+      [user_id, record_date]
     );
 
     if (existing.length > 0) {
@@ -240,12 +240,12 @@ class AttendanceModel {
       // 생성
       const [result] = await db.execute(`
         INSERT INTO daily_attendance_records (
-          record_date, worker_id, total_work_hours, attendance_type_id,
+          record_date, user_id, total_work_hours, attendance_type_id,
           vacation_type_id, is_overtime_approved, created_by
         ) VALUES (?, ?, ?, ?, ?, ?, ?)
       `, [
         record_date,
-        worker_id,
+        user_id,
         total_work_hours,
         attendance_type_id,
         vacation_type_id,
@@ -263,8 +263,8 @@ class AttendanceModel {
 
     // 모든 작업자와 해당 날짜의 근태 기록을 조회
     const [rows] = await db.execute(`
-      SELECT 
-        w.worker_id,
+      SELECT
+        w.user_id,
         w.worker_name,
         w.job_type,
         COALESCE(dar.total_work_hours, 0) as total_work_hours,
@@ -277,16 +277,16 @@ class AttendanceModel {
         vt.type_code as vacation_type_code,
         dar.notes,
         -- 작업 건수 계산
-        (SELECT COUNT(*) FROM daily_work_reports dwr 
-         WHERE dwr.worker_id = w.worker_id AND dwr.report_date = ?) as work_count,
+        (SELECT COUNT(*) FROM daily_work_reports dwr
+         WHERE dwr.user_id = w.user_id AND dwr.report_date = ?) as work_count,
         -- 오류 건수 계산
-        (SELECT COUNT(*) FROM daily_work_reports dwr 
-         WHERE dwr.worker_id = w.worker_id AND dwr.report_date = ? AND dwr.work_status_id = 2) as error_count
+        (SELECT COUNT(*) FROM daily_work_reports dwr
+         WHERE dwr.user_id = w.user_id AND dwr.report_date = ? AND dwr.work_status_id = 2) as error_count
       FROM workers w
-      LEFT JOIN daily_attendance_records dar ON w.worker_id = dar.worker_id AND dar.record_date = ?
+      LEFT JOIN daily_attendance_records dar ON w.user_id = dar.user_id AND dar.record_date = ?
       LEFT JOIN work_attendance_types wat ON dar.attendance_type_id = wat.id
       LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
-      WHERE w.is_active = TRUE
+      WHERE w.status = 'active' AND w.user_id IS NOT NULL
       ORDER BY w.worker_name
     `, [date, date, date]);
 
@@ -294,7 +294,7 @@ class AttendanceModel {
   }
 
   // 휴가 처리
-  static async processVacation(workerId, date, vacationType, createdBy) {
+  static async processVacation(userId, date, vacationType, createdBy) {
     const db = await getDb();
 
     // 휴가 유형 정보 조회
@@ -312,9 +312,9 @@ class AttendanceModel {
     // 현재 작업 시간 조회
     const [workHours] = await db.execute(`
       SELECT COALESCE(SUM(work_hours), 0) as total_hours
-      FROM daily_work_reports 
-      WHERE worker_id = ? AND report_date = ?
-    `, [workerId, date]);
+      FROM daily_work_reports
+      WHERE user_id = ? AND report_date = ?
+    `, [userId, date]);
 
     const currentHours = parseFloat(workHours[0].total_hours);
     // deduct_days를 시간으로 변환 (1일 = 8시간)
@@ -338,12 +338,12 @@ class AttendanceModel {
     // 휴가 작업 기록 생성 (프로젝트 ID 13 = "연차/휴무", work_type_id 1 = 기본)
     await db.execute(`
       INSERT INTO daily_work_reports (
-        report_date, worker_id, project_id, work_type_id, work_status_id,
+        report_date, user_id, project_id, work_type_id, work_status_id,
         work_hours, description, created_by
       ) VALUES (?, ?, 13, 1, 1, ?, ?, ?)
     `, [
       date,
-      workerId,
+      userId,
       vacationHours,
       `${vacationTypeInfo.type_name} 처리`,
       createdBy
@@ -352,7 +352,7 @@ class AttendanceModel {
     // 근태 기록 업데이트
     const attendanceData = {
       record_date: date,
-      worker_id: workerId,
+      user_id: userId,
       total_work_hours: totalHours,
       work_attendance_type_id: attendanceTypes[0]?.id,
       vacation_type_id: vacationTypeInfo.id,
@@ -364,19 +364,19 @@ class AttendanceModel {
   }
 
   // 초과근무 승인
-  static async approveOvertime(workerId, date, approvedBy) {
+  static async approveOvertime(userId, date, approvedBy) {
     const db = await getDb();
 
     const [result] = await db.execute(`
-      UPDATE daily_attendance_records 
-      SET 
+      UPDATE daily_attendance_records
+      SET
         overtime_approved = TRUE,
         overtime_approved_by = ?,
         overtime_approved_at = CURRENT_TIMESTAMP,
         updated_by = ?,
         updated_at = CURRENT_TIMESTAMP
-      WHERE worker_id = ? AND record_date = ?
-    `, [approvedBy, approvedBy, workerId, date]);
+      WHERE user_id = ? AND record_date = ?
+    `, [approvedBy, approvedBy, userId, date]);
 
     return result.affectedRows > 0;
   }
@@ -400,24 +400,24 @@ class AttendanceModel {
   }
 
   // 작업자 휴가 잔여 조회
-  static async getWorkerVacationBalance(workerId, year = null) {
+  static async getWorkerVacationBalance(userId, year = null) {
     const db = await getDb();
     const currentYear = year || new Date().getFullYear();
 
     const [rows] = await db.execute(`
-      SELECT id, worker_id, year, total_annual_leave, used_annual_leave, notes, created_at, updated_at FROM worker_vacation_balance 
-      WHERE worker_id = ? AND year = ?
-    `, [workerId, currentYear]);
+      SELECT id, user_id, year, total_annual_leave, used_annual_leave, notes, created_at, updated_at FROM worker_vacation_balance
+      WHERE user_id = ? AND year = ?
+    `, [userId, currentYear]);
 
     if (rows.length === 0) {
       // 기본 연차 생성 (15일)
       await db.execute(`
-        INSERT INTO worker_vacation_balance (worker_id, year, total_annual_leave)
+        INSERT INTO worker_vacation_balance (user_id, year, total_annual_leave)
         VALUES (?, ?, 15.0)
-      `, [workerId, currentYear]);
+      `, [userId, currentYear]);
 
       return {
-        worker_id: workerId,
+        user_id: userId,
         year: currentYear,
         total_annual_leave: 15.0,
         used_annual_leave: 0,
@@ -429,14 +429,14 @@ class AttendanceModel {
   }
 
   // 월별 근태 통계
-  static async getMonthlyAttendanceStats(year, month, workerId = null) {
+  static async getMonthlyAttendanceStats(year, month, userId = null) {
     const db = await getDb();
 
     // work_attendance_types: 1=NORMAL, 2=LATE, 3=EARLY_LEAVE, 4=ABSENT, 5=VACATION
     // vacation_types: 1=ANNUAL(연차), 2=HALF_ANNUAL(반차), 3=SICK(병가), 4=SPECIAL(경조사)
     let query = `
       SELECT
-        w.worker_id,
+        w.user_id,
         w.worker_name,
         COUNT(CASE WHEN dar.attendance_type_id = 1 AND (dar.is_overtime_approved = 0 OR dar.is_overtime_approved IS NULL) THEN 1 END) as regular_days,
         COUNT(CASE WHEN dar.is_overtime_approved = 1 OR dar.total_work_hours > 8 THEN 1 END) as overtime_days,
@@ -446,19 +446,19 @@ class AttendanceModel {
         COALESCE(SUM(dar.total_work_hours), 0) as total_work_hours,
         COALESCE(AVG(dar.total_work_hours), 0) as avg_work_hours
       FROM workers w
-      LEFT JOIN daily_attendance_records dar ON w.worker_id = dar.worker_id
+      LEFT JOIN daily_attendance_records dar ON w.user_id = dar.user_id
         AND YEAR(dar.record_date) = ? AND MONTH(dar.record_date) = ?
       WHERE w.employment_status = 'employed'
     `;
 
     const params = [year, month];
 
-    if (workerId) {
-      query += ' AND w.worker_id = ?';
-      params.push(workerId);
+    if (userId) {
+      query += ' AND w.user_id = ?';
+      params.push(userId);
     }
 
-    query += ' GROUP BY w.worker_id, w.worker_name ORDER BY w.worker_name';
+    query += ' GROUP BY w.user_id, w.worker_name ORDER BY w.worker_name';
 
     const [rows] = await db.execute(query, params);
     return rows;
@@ -467,12 +467,12 @@ class AttendanceModel {
   // 출근 체크 기록 생성 또는 업데이트
   static async upsertCheckin(checkinData) {
     const db = await getDb();
-    const { worker_id, record_date, is_present } = checkinData;
+    const { user_id, record_date, is_present } = checkinData;
 
     // 해당 날짜에 기록이 있는지 확인
     const [existing] = await db.execute(
-      'SELECT id FROM daily_attendance_records WHERE worker_id = ? AND record_date = ?',
-      [worker_id, record_date]
+      'SELECT id FROM daily_attendance_records WHERE user_id = ? AND record_date = ?',
+      [user_id, record_date]
     );
 
     if (existing.length > 0) {
@@ -486,9 +486,9 @@ class AttendanceModel {
       // 새로 생성 (기본값으로)
       const [result] = await db.execute(
         `INSERT INTO daily_attendance_records
-        (worker_id, record_date, is_present, attendance_type_id, created_by)
+        (user_id, record_date, is_present, attendance_type_id, created_by)
         VALUES (?, ?, ?, 1, 1)`,
-        [worker_id, record_date, is_present]
+        [user_id, record_date, is_present]
       );
       return result.insertId;
     }
@@ -499,7 +499,7 @@ class AttendanceModel {
     const db = await getDb();
     const query = `
       SELECT
-        w.worker_id,
+        w.user_id,
         w.worker_name,
         w.job_type,
         w.employment_status,
@@ -512,9 +512,9 @@ class AttendanceModel {
         vr.days_used as vacation_days
       FROM workers w
       LEFT JOIN daily_attendance_records dar
-        ON w.worker_id = dar.worker_id AND dar.record_date = ?
+        ON w.user_id = dar.user_id AND dar.record_date = ?
       LEFT JOIN vacation_requests vr
-        ON w.worker_id = vr.worker_id
+        ON w.user_id = vr.user_id
         AND ? BETWEEN vr.start_date AND vr.end_date
         AND vr.status = 'approved'
       LEFT JOIN vacation_types vt ON vr.vacation_type_id = vt.id
diff --git a/system1-factory/api/models/dailyIssueReportModel.js b/system1-factory/api/models/dailyIssueReportModel.js
index 103ad14..2e193de 100644
--- a/system1-factory/api/models/dailyIssueReportModel.js
+++ b/system1-factory/api/models/dailyIssueReportModel.js
@@ -12,13 +12,13 @@ const createMany = async (reports) => {
     const insertedIds = [];
     const sql = `
       INSERT INTO DailyIssueReports
-      (date, worker_id, project_id, start_time, end_time, issue_type_id)
+      (date, user_id, project_id, start_time, end_time, issue_type_id)
       VALUES (?, ?, ?, ?, ?, ?)
     `;
 
     for (const report of reports) {
-      const { date, worker_id, project_id, start_time, end_time, issue_type_id } = report;
-      const [result] = await conn.query(sql, [date, worker_id, project_id, start_time, end_time, issue_type_id]);
+      const { date, user_id, project_id, start_time, end_time, issue_type_id } = report;
+      const [result] = await conn.query(sql, [date, user_id, project_id, start_time, end_time, issue_type_id]);
       insertedIds.push(result.insertId);
     }
 
@@ -43,7 +43,7 @@ const getAllByDate = async (date) => {
       d.id, d.date, w.worker_name, p.project_name, d.start_time, d.end_time,
       t.category, t.subcategory, d.description
      FROM DailyIssueReports d
-     LEFT JOIN workers w ON d.worker_id = w.worker_id
+     LEFT JOIN workers w ON d.user_id = w.user_id
      LEFT JOIN projects p ON d.project_id = p.project_id
      LEFT JOIN IssueTypes t ON d.issue_type_id = t.issue_type_id
      WHERE d.date = ?
@@ -58,7 +58,7 @@ const getAllByDate = async (date) => {
  */
 const getById = async (id) => {
   const db = await getDb();
-  const [rows] = await db.query(`SELECT id, date, worker_id, project_id, issue_type_id, description, created_at, start_time, end_time FROM DailyIssueReports WHERE id = ?`, [id]);
+  const [rows] = await db.query(`SELECT id, date, user_id, project_id, issue_type_id, description, created_at, start_time, end_time FROM DailyIssueReports WHERE id = ?`, [id]);
   return rows[0];
 };
 
diff --git a/system1-factory/api/models/dailyWorkReportModel.js b/system1-factory/api/models/dailyWorkReportModel.js
index 04fb63d..2d1d86c 100644
--- a/system1-factory/api/models/dailyWorkReportModel.js
+++ b/system1-factory/api/models/dailyWorkReportModel.js
@@ -39,22 +39,22 @@ const getAllErrorTypes = async () => {
  * 누적 추가 전용 함수 (createDailyReport 대체) - 절대 삭제 안함!
  */
 const createDailyReport = async (reportData) => {
-  const { report_date, worker_id, work_entries, created_by, created_by_name, total_hours } = reportData;
+  const { report_date, user_id, work_entries, created_by, created_by_name, total_hours } = reportData;
   const db = await getDb();
   const conn = await db.getConnection();
 
   try {
     await conn.beginTransaction();
 
-    console.log(`${created_by_name}이 ${report_date} ${worker_id}번 작업자에게 데이터 추가 중...`);
+    console.log(`${created_by_name}이 ${report_date} ${user_id}번 작업자에게 데이터 추가 중...`);
 
     const [existingReports] = await conn.query(
       `SELECT dwr.created_by, u.name as created_by_name, COUNT(*) as count, SUM(dwr.work_hours) as total_hours
    FROM daily_work_reports dwr
-   LEFT JOIN users u ON dwr.created_by = u.user_id
-   WHERE dwr.report_date = ? AND dwr.worker_id = ?
+   LEFT JOIN sso_users u ON dwr.created_by = u.user_id
+   WHERE dwr.report_date = ? AND dwr.user_id = ?
    GROUP BY dwr.created_by`,
-      [report_date, worker_id]
+      [report_date, user_id]
     );
 
     console.log('기존 데이터 (삭제하지 않음):', existingReports);
@@ -66,9 +66,9 @@ const createDailyReport = async (reportData) => {
 
       const [insertResult] = await conn.query(
         `INSERT INTO daily_work_reports
-         (report_date, worker_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_by, created_at)
+         (report_date, user_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_by, created_at)
          VALUES (?, ?, ?, ?, ?, ?, ?, ?, NOW())`,
-        [report_date, worker_id, project_id, work_type_id, work_status_id || 1, error_type_id || null, work_hours, created_by]
+        [report_date, user_id, project_id, work_type_id, work_status_id || 1, error_type_id || null, work_hours, created_by]
       );
 
       insertedIds.push(insertResult.insertId);
@@ -77,10 +77,10 @@ const createDailyReport = async (reportData) => {
     const [finalReports] = await conn.query(
       `SELECT dwr.created_by, u.name as created_by_name, COUNT(*) as count, SUM(dwr.work_hours) as total_hours
    FROM daily_work_reports dwr
-   LEFT JOIN users u ON dwr.created_by = u.user_id
-   WHERE dwr.report_date = ? AND dwr.worker_id = ?
+   LEFT JOIN sso_users u ON dwr.created_by = u.user_id
+   WHERE dwr.report_date = ? AND dwr.user_id = ?
    GROUP BY dwr.created_by`,
-      [report_date, worker_id]
+      [report_date, user_id]
     );
 
     const grandTotal = finalReports.reduce((sum, report) => sum + parseFloat(report.total_hours || 0), 0);
@@ -103,7 +103,7 @@ const createDailyReport = async (reportData) => {
           insertedIds[0] || null,
           JSON.stringify({
             report_date,
-            worker_id,
+            user_id,
             work_entries_count: work_entries.length,
             added_hours: total_hours,
             my_total: myTotal,
@@ -123,7 +123,7 @@ const createDailyReport = async (reportData) => {
     // 근태 기록 동기화
     try {
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+      await AttendanceModel.syncWithWorkReports(user_id, report_date);
     } catch (syncErr) {
       console.error('근태 기록 동기화 실패:', syncErr);
     }
@@ -153,7 +153,7 @@ const createDailyReport = async (reportData) => {
 /**
  * 특정 날짜 + 작업자 + 작성자의 누적 현황 조회
  */
-const getMyAccumulatedHours = async (date, worker_id, created_by) => {
+const getMyAccumulatedHours = async (date, user_id, created_by) => {
   const db = await getDb();
 
   const sql = `
@@ -166,32 +166,32 @@ const getMyAccumulatedHours = async (date, worker_id, created_by) => {
       ) as my_entries
     FROM daily_work_reports dwr
     LEFT JOIN projects p ON dwr.project_id = p.project_id
-    WHERE dwr.report_date = ? AND dwr.worker_id = ? AND dwr.created_by = ?
+    WHERE dwr.report_date = ? AND dwr.user_id = ? AND dwr.created_by = ?
   `;
 
-  const [rows] = await db.query(sql, [date, worker_id, created_by]);
+  const [rows] = await db.query(sql, [date, user_id, created_by]);
   return rows[0] || { my_total_hours: 0, my_entry_count: 0, my_entries: null };
 };
 
 /**
  * 누적 현황 조회 - 날짜+작업자별 (모든 기여자)
  */
-const getAccumulatedReportsByDate = async (date, worker_id) => {
+const getAccumulatedReportsByDate = async (date, user_id) => {
   const db = await getDb();
 
   const sql = getSelectQuery() + `
-    WHERE dwr.report_date = ? AND dwr.worker_id = ?
+    WHERE dwr.report_date = ? AND dwr.user_id = ?
     ORDER BY dwr.created_by, dwr.created_at ASC
   `;
 
-  const [rows] = await db.query(sql, [date, worker_id]);
+  const [rows] = await db.query(sql, [date, user_id]);
   return rows;
 };
 
 /**
  * 기여자별 요약 조회
  */
-const getContributorsByDate = async (date, worker_id) => {
+const getContributorsByDate = async (date, user_id) => {
   const db = await getDb();
 
   const sql = `
@@ -207,14 +207,14 @@ const getContributorsByDate = async (date, worker_id) => {
         ORDER BY dwr.created_at SEPARATOR ', '
       ) as entry_details
     FROM daily_work_reports dwr
-    LEFT JOIN users u ON dwr.created_by = u.user_id
+    LEFT JOIN sso_users u ON dwr.created_by = u.user_id
     LEFT JOIN projects p ON dwr.project_id = p.project_id
-    WHERE dwr.report_date = ? AND dwr.worker_id = ?
+    WHERE dwr.report_date = ? AND dwr.user_id = ?
     GROUP BY dwr.created_by
     ORDER BY total_hours DESC, first_entry ASC
   `;
 
-  const [rows] = await db.query(sql, [date, worker_id]);
+  const [rows] = await db.query(sql, [date, user_id]);
   return rows;
 };
 
@@ -232,9 +232,9 @@ const removeSpecificEntry = async (entry_id, deleted_by) => {
     const [entryInfo] = await conn.query(
       `SELECT dwr.*, w.worker_name, p.project_name, u.name as created_by_name
        FROM daily_work_reports dwr
-       LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+       LEFT JOIN workers w ON dwr.user_id = w.user_id
        LEFT JOIN projects p ON dwr.project_id = p.project_id
-       LEFT JOIN users u ON dwr.created_by = u.user_id
+       LEFT JOIN sso_users u ON dwr.created_by = u.user_id
        WHERE dwr.id = ?`,
       [entry_id]
     );
@@ -282,7 +282,7 @@ const getSelectQuery = () => `
   SELECT
     dwr.id,
     dwr.report_date,
-    dwr.worker_id,
+    dwr.user_id,
     dwr.project_id,
     dwr.work_type_id,
     dwr.work_status_id,
@@ -299,13 +299,13 @@ const getSelectQuery = () => `
     dwr.created_at,
     dwr.updated_at
   FROM daily_work_reports dwr
-  LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+  LEFT JOIN workers w ON dwr.user_id = w.user_id
   LEFT JOIN projects p ON dwr.project_id = p.project_id
   LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
   LEFT JOIN work_status_types wst ON dwr.work_status_id = wst.id
   LEFT JOIN issue_report_items iri ON dwr.error_type_id = iri.item_id
   LEFT JOIN issue_report_categories irc ON iri.category_id = irc.category_id
-  LEFT JOIN users u ON dwr.created_by = u.user_id
+  LEFT JOIN sso_users u ON dwr.created_by = u.user_id
 `;
 
 /**
@@ -347,26 +347,26 @@ const getByDateAndCreator = async (date, created_by) => {
 /**
  * 10. 일일 작업보고서 조회 (작업자별)
  */
-const getByWorker = async (worker_id) => {
+const getByWorker = async (user_id) => {
   const db = await getDb();
   const sql = getSelectQuery() + `
-    WHERE dwr.worker_id = ?
+    WHERE dwr.user_id = ?
     ORDER BY dwr.report_date DESC, dwr.id ASC
   `;
-  const [rows] = await db.query(sql, [worker_id]);
+  const [rows] = await db.query(sql, [user_id]);
   return rows;
 };
 
 /**
  * 11. 일일 작업보고서 조회 (날짜 + 작업자)
  */
-const getByDateAndWorker = async (date, worker_id) => {
+const getByDateAndWorker = async (date, user_id) => {
   const db = await getDb();
   const sql = getSelectQuery() + `
-    WHERE dwr.report_date = ? AND dwr.worker_id = ?
+    WHERE dwr.report_date = ? AND dwr.user_id = ?
     ORDER BY dwr.id ASC
   `;
-  const [rows] = await db.query(sql, [date, worker_id]);
+  const [rows] = await db.query(sql, [date, user_id]);
   return rows;
 };
 
@@ -387,7 +387,7 @@ const getByRange = async (start_date, end_date) => {
  * 13. 상세 검색 (페이지네이션 포함)
  */
 const searchWithDetails = async (params) => {
-  const { start_date, end_date, worker_id, project_id, work_status_id, created_by, page, limit } = params;
+  const { start_date, end_date, user_id, project_id, work_status_id, created_by, page, limit } = params;
 
   const db = await getDb();
 
@@ -395,9 +395,9 @@ const searchWithDetails = async (params) => {
   let whereConditions = ['dwr.report_date BETWEEN ? AND ?'];
   let queryParams = [start_date, end_date];
 
-  if (worker_id) {
-    whereConditions.push('dwr.worker_id = ?');
-    queryParams.push(worker_id);
+  if (user_id) {
+    whereConditions.push('dwr.user_id = ?');
+    queryParams.push(user_id);
   }
 
   if (project_id) {
@@ -448,16 +448,16 @@ const getSummaryByDate = async (date) => {
 
   const sql = `
     SELECT
-      dwr.worker_id,
+      dwr.user_id,
       w.worker_name,
       dwr.report_date,
       SUM(dwr.work_hours) as total_hours,
       COUNT(*) as work_entries_count,
       SUM(CASE WHEN dwr.work_status_id = 2 THEN 1 ELSE 0 END) as error_count
     FROM daily_work_reports dwr
-    LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+    LEFT JOIN workers w ON dwr.user_id = w.user_id
     WHERE dwr.report_date = ?
-    GROUP BY dwr.worker_id, dwr.report_date
+    GROUP BY dwr.user_id, dwr.report_date
     ORDER BY w.worker_name ASC
   `;
   const [rows] = await db.query(sql, [date]);
@@ -467,24 +467,24 @@ const getSummaryByDate = async (date) => {
 /**
  * 15. 일일 근무 요약 조회 (작업자별)
  */
-const getSummaryByWorker = async (worker_id) => {
+const getSummaryByWorker = async (user_id) => {
   const db = await getDb();
 
   const sql = `
     SELECT
       dwr.report_date,
-      dwr.worker_id,
+      dwr.user_id,
       w.worker_name,
       SUM(dwr.work_hours) as total_hours,
       COUNT(*) as work_entries_count,
       SUM(CASE WHEN dwr.work_status_id = 2 THEN 1 ELSE 0 END) as error_count
     FROM daily_work_reports dwr
-    LEFT JOIN workers w ON dwr.worker_id = w.worker_id
-    WHERE dwr.worker_id = ?
-    GROUP BY dwr.report_date, dwr.worker_id
+    LEFT JOIN workers w ON dwr.user_id = w.user_id
+    WHERE dwr.user_id = ?
+    GROUP BY dwr.report_date, dwr.user_id
     ORDER BY dwr.report_date DESC
   `;
-  const [rows] = await db.query(sql, [worker_id]);
+  const [rows] = await db.query(sql, [user_id]);
   return rows;
 };
 
@@ -499,7 +499,7 @@ const getMonthlySummary = async (year, month) => {
   const sql = `
     SELECT
       dwr.report_date,
-      dwr.worker_id,
+      dwr.user_id,
       w.worker_name,
       SUM(dwr.work_hours) as total_work_hours,
       COUNT(DISTINCT dwr.project_id) as project_count,
@@ -508,11 +508,11 @@ const getMonthlySummary = async (year, month) => {
       GROUP_CONCAT(DISTINCT p.project_name ORDER BY p.project_name) as projects,
       GROUP_CONCAT(DISTINCT wt.name ORDER BY wt.name) as work_types
     FROM daily_work_reports dwr
-    LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+    LEFT JOIN workers w ON dwr.user_id = w.user_id
     LEFT JOIN projects p ON dwr.project_id = p.project_id
     LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
     WHERE dwr.report_date BETWEEN ? AND ?
-    GROUP BY dwr.report_date, dwr.worker_id
+    GROUP BY dwr.report_date, dwr.user_id
     ORDER BY dwr.report_date DESC, w.worker_name ASC
   `;
   const [rows] = await db.query(sql, [start, end]);
@@ -567,11 +567,11 @@ const updateById = async (id, updateData) => {
 
   // [Sync] 근태 기록 동기화
   try {
-    const [targetReport] = await db.query('SELECT worker_id, report_date FROM daily_work_reports WHERE id = ?', [id]);
+    const [targetReport] = await db.query('SELECT user_id, report_date FROM daily_work_reports WHERE id = ?', [id]);
     if (targetReport.length > 0) {
-      const { worker_id, report_date } = targetReport[0];
+      const { user_id, report_date } = targetReport[0];
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+      await AttendanceModel.syncWithWorkReports(user_id, report_date);
     }
   } catch (syncErr) {
     console.error('근태 기록 동기화 실패 (Update):', syncErr);
@@ -615,9 +615,9 @@ const removeById = async (id, deletedBy) => {
     // [Sync] 근태 기록 동기화
     if (reportInfo.length > 0) {
       try {
-        const { worker_id, report_date } = reportInfo[0];
+        const { user_id, report_date } = reportInfo[0];
         const AttendanceModel = require('./attendanceModel');
-        await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+        await AttendanceModel.syncWithWorkReports(user_id, report_date);
       } catch (syncErr) {
         console.error('근태 기록 동기화 실패 (Delete):', syncErr);
       }
@@ -635,7 +635,7 @@ const removeById = async (id, deletedBy) => {
 /**
  * 19. 작업자의 특정 날짜 전체 삭제
  */
-const removeByDateAndWorker = async (date, worker_id, deletedBy) => {
+const removeByDateAndWorker = async (date, user_id, deletedBy) => {
   const db = await getDb();
   const conn = await db.getConnection();
 
@@ -644,14 +644,14 @@ const removeByDateAndWorker = async (date, worker_id, deletedBy) => {
 
     // 삭제 전 정보 저장 (감사 로그용)
     const [reportInfos] = await conn.query(
-      'SELECT id, report_date, worker_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_at, updated_at, created_by, updated_by FROM daily_work_reports WHERE report_date = ? AND worker_id = ?',
-      [date, worker_id]
+      'SELECT id, report_date, user_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_at, updated_at, created_by, updated_by FROM daily_work_reports WHERE report_date = ? AND user_id = ?',
+      [date, user_id]
     );
 
     // 작업보고서 삭제
     const [result] = await conn.query(
-      'DELETE FROM daily_work_reports WHERE report_date = ? AND worker_id = ?',
-      [date, worker_id]
+      'DELETE FROM daily_work_reports WHERE report_date = ? AND user_id = ?',
+      [date, user_id]
     );
 
     // 감사 로그 추가
@@ -673,7 +673,7 @@ const removeByDateAndWorker = async (date, worker_id, deletedBy) => {
     // [Sync] 근태 기록 동기화
     try {
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(worker_id, date);
+      await AttendanceModel.syncWithWorkReports(user_id, date);
     } catch (syncErr) {
       console.error('근태 기록 동기화 실패 (Batch Delete):', syncErr);
     }
@@ -697,7 +697,7 @@ const getStatistics = async (start_date, end_date) => {
     SELECT
       COUNT(*) as total_reports,
       SUM(work_hours) as total_hours,
-      COUNT(DISTINCT worker_id) as unique_workers,
+      COUNT(DISTINCT user_id) as unique_workers,
       COUNT(DISTINCT project_id) as unique_projects
     FROM daily_work_reports
     WHERE report_date BETWEEN ? AND ?
@@ -708,7 +708,7 @@ const getStatistics = async (start_date, end_date) => {
     SELECT
       report_date,
       SUM(work_hours) as daily_hours,
-      COUNT(DISTINCT worker_id) as daily_workers
+      COUNT(DISTINCT user_id) as daily_workers
     FROM daily_work_reports
     WHERE report_date BETWEEN ? AND ?
     GROUP BY report_date
@@ -727,7 +727,7 @@ const getStatistics = async (start_date, end_date) => {
  * @param {object} modelData - 서비스 레이어에서 전달된 데이터
  * @returns {Promise<object>} 삽입된 항목의 ID 배열과 개수
  */
-const createReportEntries = async ({ report_date, worker_id, entries }) => {
+const createReportEntries = async ({ report_date, user_id, entries }) => {
   const db = await getDb();
   const conn = await db.getConnection();
   try {
@@ -736,7 +736,7 @@ const createReportEntries = async ({ report_date, worker_id, entries }) => {
     const insertedIds = [];
     const sql = `
       INSERT INTO daily_work_reports
-      (report_date, worker_id, project_id, work_type_id, work_hours, work_status_id, error_type_id, created_by)
+      (report_date, user_id, project_id, work_type_id, work_hours, work_status_id, error_type_id, created_by)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?)
     `;
 
@@ -744,7 +744,7 @@ const createReportEntries = async ({ report_date, worker_id, entries }) => {
       const { project_id, work_type_id, work_hours, work_status_id, error_type_id, created_by } = entry;
       const [result] = await conn.query(sql, [
         report_date,
-        worker_id,
+        user_id,
         project_id,
         work_type_id,
         work_hours,
@@ -760,7 +760,7 @@ const createReportEntries = async ({ report_date, worker_id, entries }) => {
     // [Sync] 근태 기록 동기화
     try {
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+      await AttendanceModel.syncWithWorkReports(user_id, report_date);
     } catch (syncErr) {
       console.error('근태 기록 동기화 실패 (V2 Create):', syncErr);
     }
@@ -788,7 +788,7 @@ const getSelectQueryV2 = () => `
   SELECT
     dwr.id,
     dwr.report_date,
-    dwr.worker_id,
+    dwr.user_id,
     dwr.project_id,
     dwr.work_type_id,
     dwr.work_status_id,
@@ -805,19 +805,19 @@ const getSelectQueryV2 = () => `
     u.name as created_by_name,
     dwr.created_at
   FROM daily_work_reports dwr
-  LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+  LEFT JOIN workers w ON dwr.user_id = w.user_id
   LEFT JOIN projects p ON dwr.project_id = p.project_id
   LEFT JOIN tasks t ON dwr.work_type_id = t.task_id
   LEFT JOIN work_types wt ON t.work_type_id = wt.id
   LEFT JOIN work_status_types wst ON dwr.work_status_id = wst.id
   LEFT JOIN issue_report_items iri ON dwr.error_type_id = iri.item_id
   LEFT JOIN issue_report_categories irc ON iri.category_id = irc.category_id
-  LEFT JOIN users u ON dwr.created_by = u.user_id
+  LEFT JOIN sso_users u ON dwr.created_by = u.user_id
 `;
 
 /**
  * [V2] 옵션 기반으로 작업 보고서를 조회합니다.
- * @param {object} options - 조회 조건 (date, worker_id, created_by_user_id 등)
+ * @param {object} options - 조회 조건 (date, user_id, created_by_user_id 등)
  * @returns {Promise<Array>} 조회된 작업 보고서 배열
  */
 const getReportsWithOptions = async (options) => {
@@ -834,9 +834,9 @@ const getReportsWithOptions = async (options) => {
     queryParams.push(options.start_date, options.end_date);
   }
 
-  if (options.worker_id) {
-    whereConditions.push('dwr.worker_id = ?');
-    queryParams.push(options.worker_id);
+  if (options.user_id) {
+    whereConditions.push('dwr.user_id = ?');
+    queryParams.push(options.user_id);
   }
   if (options.created_by_user_id) {
     whereConditions.push('dwr.created_by = ?');
@@ -890,7 +890,7 @@ const updateReportById = async (reportId, updateData) => {
   // [Sync] 업데이트 전 정보 조회 (동기화를 위해)
   let targetInfo = null;
   try {
-    const [rows] = await db.query('SELECT worker_id, report_date FROM daily_work_reports WHERE id = ?', [reportId]);
+    const [rows] = await db.query('SELECT user_id, report_date FROM daily_work_reports WHERE id = ?', [reportId]);
     if (rows.length > 0) targetInfo = rows[0];
   } catch (e) { console.warn('Sync fetch failed', e); }
 
@@ -902,7 +902,7 @@ const updateReportById = async (reportId, updateData) => {
   if (targetInfo) {
     try {
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(targetInfo.worker_id, targetInfo.report_date);
+      await AttendanceModel.syncWithWorkReports(targetInfo.user_id, targetInfo.report_date);
     } catch (syncErr) {
       console.error('근태 기록 동기화 실패 (V2 Update):', syncErr);
     }
@@ -925,7 +925,7 @@ const removeReportById = async (reportId, deletedByUserId) => {
     await conn.beginTransaction();
 
     // 감사 로그를 위해 삭제 전 정보 조회
-    const [reportInfo] = await conn.query('SELECT id, report_date, worker_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_at, updated_at, created_by, updated_by FROM daily_work_reports WHERE id = ?', [reportId]);
+    const [reportInfo] = await conn.query('SELECT id, report_date, user_id, project_id, work_type_id, work_status_id, error_type_id, work_hours, created_at, updated_at, created_by, updated_by FROM daily_work_reports WHERE id = ?', [reportId]);
 
     // 실제 삭제 작업
     const [result] = await conn.query('DELETE FROM daily_work_reports WHERE id = ?', [reportId]);
@@ -940,9 +940,9 @@ const removeReportById = async (reportId, deletedByUserId) => {
     // [Sync] 근태 기록 동기화
     if (reportInfo.length > 0) {
       try {
-        const { worker_id, report_date } = reportInfo[0];
+        const { user_id, report_date } = reportInfo[0];
         const AttendanceModel = require('./attendanceModel');
-        await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+        await AttendanceModel.syncWithWorkReports(user_id, report_date);
       } catch (syncErr) {
         console.error('근태 기록 동기화 실패 (V2 Delete):', syncErr);
       }
@@ -1075,7 +1075,7 @@ const createFromTbmAssignment = async (reportData) => {
   const {
     tbm_assignment_id,
     tbm_session_id,
-    worker_id,
+    user_id,
     project_id,
     work_type_id,
     report_date,
@@ -1098,7 +1098,7 @@ const createFromTbmAssignment = async (reportData) => {
     // 1. 작업보고서 생성
     const sql = `
       INSERT INTO daily_work_reports
-      (tbm_session_id, tbm_assignment_id, report_date, worker_id, project_id, work_type_id,
+      (tbm_session_id, tbm_assignment_id, report_date, user_id, project_id, work_type_id,
        start_time, end_time, work_hours, total_hours, regular_hours, error_hours,
        work_status_id, error_type_id, created_by, created_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW())
@@ -1108,7 +1108,7 @@ const createFromTbmAssignment = async (reportData) => {
       tbm_session_id,
       tbm_assignment_id,
       report_date,
-      worker_id,
+      user_id,
       project_id,
       work_type_id,
       start_time || null,
@@ -1150,7 +1150,7 @@ const createFromTbmAssignment = async (reportData) => {
     // 4. 근태 기록 동기화
     try {
       const AttendanceModel = require('./attendanceModel');
-      await AttendanceModel.syncWithWorkReports(worker_id, report_date);
+      await AttendanceModel.syncWithWorkReports(user_id, report_date);
     } catch (syncErr) {
       console.error('근태 기록 동기화 실패 (TBM Report):', syncErr);
     }
diff --git a/system1-factory/api/models/departmentModel.js b/system1-factory/api/models/departmentModel.js
index e9c329b..bfe7e8c 100644
--- a/system1-factory/api/models/departmentModel.js
+++ b/system1-factory/api/models/departmentModel.js
@@ -91,7 +91,7 @@ const departmentModel = {
       SELECT w.*, d.department_name, u.user_id, u.username
       FROM workers w
       LEFT JOIN departments d ON w.department_id = d.department_id
-      LEFT JOIN users u ON u.worker_id = w.worker_id
+      LEFT JOIN users u ON u.user_id = w.user_id
       WHERE w.department_id = ?
       ORDER BY w.worker_name
     `, [departmentId]);
@@ -99,20 +99,20 @@ const departmentModel = {
   },
 
   // 작업자 부서 변경
-  async moveWorker(workerId, departmentId) {
+  async moveWorker(userId, departmentId) {
     const db = await getDb();
     const [result] = await db.query(`
-      UPDATE workers SET department_id = ? WHERE worker_id = ?
-    `, [departmentId, workerId]);
+      UPDATE workers SET department_id = ? WHERE user_id = ?
+    `, [departmentId, userId]);
     return result.affectedRows > 0;
   },
 
   // 여러 작업자 부서 일괄 변경
-  async moveWorkers(workerIds, departmentId) {
+  async moveWorkers(userIds, departmentId) {
     const db = await getDb();
     const [result] = await db.query(`
-      UPDATE workers SET department_id = ? WHERE worker_id IN (?)
-    `, [departmentId, workerIds]);
+      UPDATE workers SET department_id = ? WHERE user_id IN (?)
+    `, [departmentId, userIds]);
     return result.affectedRows;
   }
 };
diff --git a/system1-factory/api/models/monthlyStatusModel.js b/system1-factory/api/models/monthlyStatusModel.js
index d7e86e4..f40df94 100644
--- a/system1-factory/api/models/monthlyStatusModel.js
+++ b/system1-factory/api/models/monthlyStatusModel.js
@@ -49,7 +49,7 @@ class MonthlyStatusModel {
       // daily_work_reports에서 직접 집계하여 조회 (중복 없음 보장)
       const [rows] = await db.query(`
         SELECT 
-          w.worker_id,
+          w.user_id,
           w.worker_name,
           w.job_type,
           YEAR(?) as year,
@@ -77,9 +77,9 @@ class MonthlyStatusModel {
           END as has_issues,
           MAX(dwr.created_at) as last_updated
         FROM workers w
-        LEFT JOIN daily_work_reports dwr ON w.worker_id = dwr.worker_id AND dwr.report_date = ?
+        LEFT JOIN daily_work_reports dwr ON w.user_id = dwr.user_id AND dwr.report_date = ?
         WHERE w.status = 'active'
-        GROUP BY w.worker_id, w.worker_name, w.job_type
+        GROUP BY w.user_id, w.worker_name, w.job_type
         ORDER BY w.worker_name ASC
       `, [date, date, date, date]);
 
@@ -97,15 +97,15 @@ class MonthlyStatusModel {
     try {
       // 해당 월의 모든 날짜와 작업자 조합을 찾아서 재계산
       const [workDates] = await db.execute(`
-        SELECT DISTINCT report_date, worker_id
-        FROM daily_work_reports 
+        SELECT DISTINCT report_date, user_id
+        FROM daily_work_reports
         WHERE YEAR(report_date) = ? AND MONTH(report_date) = ?
       `, [year, month]);
 
       let updatedCount = 0;
 
-      for (const { report_date, worker_id } of workDates) {
-        await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [report_date, worker_id]);
+      for (const { report_date, user_id } of workDates) {
+        await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [report_date, user_id]);
         updatedCount++;
       }
 
@@ -119,23 +119,23 @@ class MonthlyStatusModel {
   }
 
   // 특정 날짜 집계 강제 업데이트
-  static async updateDateSummary(date, workerId = null) {
+  static async updateDateSummary(date, userId = null) {
     const db = await getDb();
 
     try {
-      if (workerId) {
+      if (userId) {
         // 특정 작업자만 업데이트
-        await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [date, workerId]);
+        await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [date, userId]);
       } else {
         // 해당 날짜의 모든 작업자 업데이트
         const [workers] = await db.execute(`
-          SELECT DISTINCT worker_id
-          FROM daily_work_reports 
+          SELECT DISTINCT user_id
+          FROM daily_work_reports
           WHERE report_date = ?
         `, [date]);
 
-        for (const { worker_id } of workers) {
-          await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [date, worker_id]);
+        for (const { user_id } of workers) {
+          await db.execute('CALL UpdateMonthlyWorkerStatus(?, ?)', [date, user_id]);
         }
       }
 
@@ -163,7 +163,7 @@ class MonthlyStatusModel {
       const [workerStatusCount] = await db.execute(`
         SELECT 
           COUNT(*) as total_records,
-          COUNT(DISTINCT worker_id) as unique_workers,
+          COUNT(DISTINCT user_id) as unique_workers,
           COUNT(DISTINCT date) as unique_dates,
           MAX(last_updated) as last_update
         FROM monthly_worker_status
diff --git a/system1-factory/api/models/pageAccessModel.js b/system1-factory/api/models/pageAccessModel.js
index 0d50190..b1632ee 100644
--- a/system1-factory/api/models/pageAccessModel.js
+++ b/system1-factory/api/models/pageAccessModel.js
@@ -139,13 +139,13 @@ const PageAccessModel = {
         u.name,
         u.role_id,
         r.name as role_name,
-        u.worker_id,
+        u.user_id as worker_user_id,
         w.worker_name,
         w.job_type,
         COUNT(upa.page_id) as granted_pages_count
       FROM users u
       LEFT JOIN roles r ON u.role_id = r.id
-      LEFT JOIN workers w ON u.worker_id = w.worker_id
+      LEFT JOIN workers w ON u.user_id = w.user_id
       LEFT JOIN user_page_access upa ON u.user_id = upa.user_id AND upa.can_access = 1
       WHERE u.is_active = 1
         AND u.role_id IN (4, 5)
diff --git a/system1-factory/api/models/tbmModel.js b/system1-factory/api/models/tbmModel.js
index 27704a9..ad35da2 100644
--- a/system1-factory/api/models/tbmModel.js
+++ b/system1-factory/api/models/tbmModel.js
@@ -8,11 +8,11 @@ const TbmModel = {
     const db = await getDb();
     const [result] = await db.query(
       `INSERT INTO tbm_sessions
-      (session_date, leader_id, project_id, work_type_id, task_id, work_location, created_by)
+      (session_date, leader_user_id, project_id, work_type_id, task_id, work_location, created_by)
       VALUES (?, ?, ?, ?, ?, ?, ?)`,
       [
         sessionData.session_date,
-        sessionData.leader_id,
+        sessionData.leader_user_id,
         sessionData.project_id || null,
         sessionData.work_type_id || null,
         sessionData.task_id || null,
@@ -32,7 +32,7 @@ const TbmModel = {
         w.job_type as leader_job_type,
         u.username as created_by_username,
         u.name as created_by_name,
-        COUNT(DISTINCT ta.worker_id) as team_member_count,
+        COUNT(DISTINCT ta.user_id) as team_member_count,
         GROUP_CONCAT(DISTINCT w2.worker_name ORDER BY ta.assignment_id SEPARATOR ', ') as team_member_names,
         (SELECT COUNT(*) FROM tbm_transfers tf
          WHERE (tf.source_session_id = s.session_id OR tf.dest_session_id = s.session_id)
@@ -46,10 +46,10 @@ const TbmModel = {
         first_t.task_name,
         first_wp.workplace_name as work_location
       FROM tbm_sessions s
-      LEFT JOIN workers w ON s.leader_id = w.worker_id
+      LEFT JOIN workers w ON s.leader_user_id = w.user_id
       LEFT JOIN sso_users u ON s.created_by = u.user_id
       LEFT JOIN tbm_team_assignments ta ON s.session_id = ta.session_id
-      LEFT JOIN workers w2 ON ta.worker_id = w2.worker_id
+      LEFT JOIN workers w2 ON ta.user_id = w2.user_id
       LEFT JOIN (
         SELECT * FROM tbm_team_assignments
         WHERE (session_id, assignment_id) IN (
@@ -80,7 +80,7 @@ const TbmModel = {
         w.phone_number as leader_phone,
         u.username as created_by_username,
         u.name as created_by_name,
-        COUNT(DISTINCT ta.worker_id) as team_member_count,
+        COUNT(DISTINCT ta.user_id) as team_member_count,
         first_p.project_name,
         first_p.job_no,
         first_wt.name as work_type_name,
@@ -90,7 +90,7 @@ const TbmModel = {
         first_wp.workplace_name as work_location,
         first_wc.category_name as workplace_category_name
       FROM tbm_sessions s
-      LEFT JOIN workers w ON s.leader_id = w.worker_id
+      LEFT JOIN workers w ON s.leader_user_id = w.user_id
       LEFT JOIN sso_users u ON s.created_by = u.user_id
       LEFT JOIN tbm_team_assignments ta ON s.session_id = ta.session_id
       LEFT JOIN (
@@ -165,8 +165,8 @@ const TbmModel = {
         await conn.query(
           `UPDATE tbm_team_assignments
            SET attendance_type = ?, attendance_hours = ?
-           WHERE session_id = ? AND worker_id = ?`,
-          [item.attendance_type, item.attendance_hours || null, sessionId, item.worker_id]
+           WHERE session_id = ? AND user_id = ?`,
+          [item.attendance_type, item.attendance_hours || null, sessionId, item.user_id]
         );
       }
 
@@ -174,8 +174,8 @@ const TbmModel = {
       const annualWorkers = attendanceData.filter(a => a.attendance_type === 'annual');
       for (const aw of annualWorkers) {
         const [assignRows] = await conn.query(
-          'SELECT assignment_id FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-          [sessionId, aw.worker_id]
+          'SELECT assignment_id FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+          [sessionId, aw.user_id]
         );
         if (assignRows.length > 0) {
           const [existingReport] = await conn.query(
@@ -185,9 +185,9 @@ const TbmModel = {
           if (existingReport.length === 0) {
             await conn.query(
               `INSERT INTO daily_work_reports
-               (report_date, worker_id, project_id, work_hours, work_status_id, created_by, tbm_assignment_id, created_at)
+               (report_date, user_id, project_id, work_hours, work_status_id, created_by, tbm_assignment_id, created_at)
                VALUES (?, ?, 13, 8, 1, ?, ?, NOW())`,
-              [reportDate, aw.worker_id, createdBy, assignRows[0].assignment_id]
+              [reportDate, aw.user_id, createdBy, assignRows[0].assignment_id]
             );
           }
         }
@@ -207,7 +207,7 @@ const TbmModel = {
       for (const aw of annualWorkers) {
         try {
           const AttendanceModel = require('./attendanceModel');
-          await AttendanceModel.syncWithWorkReports(aw.worker_id, reportDate);
+          await AttendanceModel.syncWithWorkReports(aw.user_id, reportDate);
         } catch (syncErr) {
           // 근태 동기화 오류 (무시됨)
         }
@@ -237,7 +237,7 @@ const TbmModel = {
     const db = await getDb();
     const [result] = await db.query(
       `INSERT INTO tbm_team_assignments
-      (session_id, worker_id, split_seq, assigned_role, work_detail, is_present, absence_reason,
+      (session_id, user_id, split_seq, assigned_role, work_detail, is_present, absence_reason,
        project_id, work_type_id, task_id, workplace_category_id, workplace_id, work_hours)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
       ON DUPLICATE KEY UPDATE
@@ -253,7 +253,7 @@ const TbmModel = {
         work_hours = COALESCE(VALUES(work_hours), work_hours)`,
       [
         assignmentData.session_id,
-        assignmentData.worker_id,
+        assignmentData.user_id,
         assignmentData.split_seq || 0,
         assignmentData.assigned_role,
         assignmentData.work_detail,
@@ -273,19 +273,19 @@ const TbmModel = {
   addSplitAssignment: async (assignmentData) => {
     const db = await getDb();
     const [maxRows] = await db.query(
-      'SELECT COALESCE(MAX(split_seq), -1) as max_seq FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-      [assignmentData.session_id, assignmentData.worker_id]
+      'SELECT COALESCE(MAX(split_seq), -1) as max_seq FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+      [assignmentData.session_id, assignmentData.user_id]
     );
     const nextSeq = (maxRows[0].max_seq || 0) + 1;
 
     const [result] = await db.query(
       `INSERT INTO tbm_team_assignments
-      (session_id, worker_id, split_seq, work_hours, project_id, work_type_id,
+      (session_id, user_id, split_seq, work_hours, project_id, work_type_id,
        task_id, workplace_category_id, workplace_id, is_present)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, 1)`,
       [
         assignmentData.session_id,
-        assignmentData.worker_id,
+        assignmentData.user_id,
         nextSeq,
         assignmentData.work_hours,
         assignmentData.project_id || null,
@@ -306,7 +306,7 @@ const TbmModel = {
     const db = await getDb();
     const values = members.map(m => [
       sessionId,
-      m.worker_id,
+      m.user_id,
       m.assigned_role || null,
       m.work_detail || null,
       m.is_present !== undefined ? m.is_present : true,
@@ -320,7 +320,7 @@ const TbmModel = {
 
     const [result] = await db.query(
       `INSERT INTO tbm_team_assignments
-      (session_id, worker_id, assigned_role, work_detail, is_present, absence_reason,
+      (session_id, user_id, assigned_role, work_detail, is_present, absence_reason,
        project_id, work_type_id, task_id, workplace_category_id, workplace_id)
       VALUES ?`,
       [values]
@@ -343,7 +343,7 @@ const TbmModel = {
         wc.category_name AS workplace_category_name,
         wp.workplace_name
       FROM tbm_team_assignments ta
-      INNER JOIN workers w ON ta.worker_id = w.worker_id
+      INNER JOIN workers w ON ta.user_id = w.user_id
       LEFT JOIN projects p ON ta.project_id = p.project_id
       LEFT JOIN work_types wt ON ta.work_type_id = wt.id
       LEFT JOIN tasks t ON ta.task_id = t.task_id
@@ -359,7 +359,7 @@ const TbmModel = {
   removeTeamMember: async (sessionId, workerId) => {
     const db = await getDb();
     const [result] = await db.query(
-      `DELETE FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?`,
+      `DELETE FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?`,
       [sessionId, workerId]
     );
     return result;
@@ -464,13 +464,13 @@ const TbmModel = {
     const db = await getDb();
     const [result] = await db.query(
       `INSERT INTO team_handovers
-      (session_id, from_leader_id, to_leader_id, handover_date, handover_time,
+      (session_id, from_leader_user_id, to_leader_user_id, handover_date, handover_time,
        reason, handover_notes, worker_ids)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
       [
         handoverData.session_id,
-        handoverData.from_leader_id,
-        handoverData.to_leader_id,
+        handoverData.from_leader_user_id,
+        handoverData.to_leader_user_id,
         handoverData.handover_date,
         handoverData.handover_time,
         handoverData.reason,
@@ -502,8 +502,8 @@ const TbmModel = {
         u.username as confirmed_by_username,
         u.name as confirmed_by_name
       FROM team_handovers h
-      INNER JOIN workers w1 ON h.from_leader_id = w1.worker_id
-      INNER JOIN workers w2 ON h.to_leader_id = w2.worker_id
+      INNER JOIN workers w1 ON h.from_leader_user_id = w1.user_id
+      INNER JOIN workers w2 ON h.to_leader_user_id = w2.user_id
       LEFT JOIN sso_users u ON h.confirmed_by = u.user_id
       WHERE h.handover_date = ?
       ORDER BY h.handover_time DESC`,
@@ -521,9 +521,9 @@ const TbmModel = {
         w1.phone_number as from_leader_phone,
         s.work_location
       FROM team_handovers h
-      INNER JOIN workers w1 ON h.from_leader_id = w1.worker_id
+      INNER JOIN workers w1 ON h.from_leader_user_id = w1.user_id
       LEFT JOIN tbm_sessions s ON h.session_id = s.session_id
-      WHERE h.to_leader_id = ? AND h.is_confirmed = 0
+      WHERE h.to_leader_user_id = ? AND h.is_confirmed = 0
       ORDER BY h.handover_date DESC, h.handover_time DESC`,
       [toLeaderId]
     );
@@ -538,7 +538,7 @@ const TbmModel = {
       `SELECT
         DATE(session_date) as date,
         COUNT(DISTINCT session_id) as session_count,
-        COUNT(DISTINCT leader_id) as leader_count,
+        COUNT(DISTINCT leader_user_id) as leader_count,
         SUM(CASE WHEN status = 'completed' THEN 1 ELSE 0 END) as completed_count
       FROM tbm_sessions
       WHERE session_date BETWEEN ? AND ?
@@ -553,16 +553,16 @@ const TbmModel = {
     const db = await getDb();
     const [rows] = await db.query(
       `SELECT
-        s.leader_id,
+        s.leader_user_id,
         w.worker_name as leader_name,
         COUNT(DISTINCT s.session_id) as total_sessions,
         SUM(CASE WHEN s.status = 'completed' THEN 1 ELSE 0 END) as completed_sessions,
-        COUNT(DISTINCT ta.worker_id) as total_team_members
+        COUNT(DISTINCT ta.user_id) as total_team_members
       FROM tbm_sessions s
-      INNER JOIN workers w ON s.leader_id = w.worker_id
+      INNER JOIN workers w ON s.leader_user_id = w.user_id
       LEFT JOIN tbm_team_assignments ta ON s.session_id = ta.session_id
       WHERE s.session_date BETWEEN ? AND ?
-      GROUP BY s.leader_id
+      GROUP BY s.leader_user_id
       ORDER BY total_sessions DESC`,
       [startDate, endDate]
     );
@@ -597,7 +597,7 @@ const TbmModel = {
       `SELECT
         ta.assignment_id,
         ta.session_id,
-        ta.worker_id,
+        ta.user_id,
         ta.project_id,
         ta.work_type_id,
         ta.task_id,
@@ -620,9 +620,9 @@ const TbmModel = {
         lw.worker_name as leader_name
       FROM tbm_team_assignments ta
       INNER JOIN tbm_sessions s ON ta.session_id = s.session_id
-      INNER JOIN workers w ON ta.worker_id = w.worker_id
+      INNER JOIN workers w ON ta.user_id = w.user_id
       LEFT JOIN sso_users creator ON s.created_by = creator.user_id
-      LEFT JOIN workers lw ON s.leader_id = lw.worker_id
+      LEFT JOIN workers lw ON s.leader_user_id = lw.user_id
       LEFT JOIN projects p ON ta.project_id = p.project_id
       LEFT JOIN work_types wt ON ta.work_type_id = wt.id
       LEFT JOIN tasks t ON ta.task_id = t.task_id
diff --git a/system1-factory/api/models/tbmTransferModel.js b/system1-factory/api/models/tbmTransferModel.js
index 7f60bf1..87953d2 100644
--- a/system1-factory/api/models/tbmTransferModel.js
+++ b/system1-factory/api/models/tbmTransferModel.js
@@ -13,15 +13,15 @@ const TbmTransferModel = {
       await conn.beginTransaction();
 
       const {
-        transfer_type, worker_id, source_session_id, dest_session_id,
+        transfer_type, user_id, source_session_id, dest_session_id,
         hours, initiated_by, transfer_date,
         project_id, work_type_id, task_id, workplace_category_id, workplace_id
       } = transferData;
 
       // 1. source 세션에서 해당 작업자의 work_hours 업데이트
       const [sourceRows] = await conn.query(
-        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-        [source_session_id, worker_id]
+        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+        [source_session_id, user_id]
       );
 
       if (sourceRows.length === 0) {
@@ -38,28 +38,28 @@ const TbmTransferModel = {
       }
 
       await conn.query(
-        'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND worker_id = ?',
-        [newSourceHours, source_session_id, worker_id]
+        'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND user_id = ?',
+        [newSourceHours, source_session_id, user_id]
       );
 
       // 2. dest 세션에 작업자 INSERT (이미 있으면 work_hours 증가)
       const [destRows] = await conn.query(
-        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-        [dest_session_id, worker_id]
+        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+        [dest_session_id, user_id]
       );
 
       if (destRows.length > 0) {
         const existingHours = destRows[0].work_hours === null ? 8 : parseFloat(destRows[0].work_hours);
         await conn.query(
-          'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND worker_id = ?',
-          [existingHours + parseFloat(hours), dest_session_id, worker_id]
+          'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND user_id = ?',
+          [existingHours + parseFloat(hours), dest_session_id, user_id]
         );
       } else {
         await conn.query(
           `INSERT INTO tbm_team_assignments
-           (session_id, worker_id, work_hours, project_id, work_type_id, task_id, workplace_category_id, workplace_id, is_present)
+           (session_id, user_id, work_hours, project_id, work_type_id, task_id, workplace_category_id, workplace_id, is_present)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, 1)`,
-          [dest_session_id, worker_id, parseFloat(hours),
+          [dest_session_id, user_id, parseFloat(hours),
            project_id || null, work_type_id || null, task_id || null,
            workplace_category_id || null, workplace_id || null]
         );
@@ -68,18 +68,18 @@ const TbmTransferModel = {
       // 3. tbm_transfers에 로그 INSERT
       const [logResult] = await conn.query(
         `INSERT INTO tbm_transfers
-         (transfer_date, worker_id, source_session_id, dest_session_id, hours, transfer_type, initiated_by)
+         (transfer_date, user_id, source_session_id, dest_session_id, hours, transfer_type, initiated_by)
          VALUES (?, ?, ?, ?, ?, ?, ?)`,
-        [transfer_date, worker_id, source_session_id, dest_session_id, parseFloat(hours), transfer_type, initiated_by]
+        [transfer_date, user_id, source_session_id, dest_session_id, parseFloat(hours), transfer_type, initiated_by]
       );
 
       // 4. 합계 시간 검증 (경고만, 차단 안함)
       const [totalRows] = await conn.query(
         `SELECT SUM(COALESCE(work_hours, 8)) as total_hours
          FROM tbm_team_assignments
-         WHERE worker_id = ?
+         WHERE user_id = ?
            AND session_id IN (SELECT session_id FROM tbm_sessions WHERE session_date = ?)`,
-        [worker_id, transfer_date]
+        [user_id, transfer_date]
       );
       const totalHours = totalRows[0] ? parseFloat(totalRows[0].total_hours) : 0;
 
@@ -128,8 +128,8 @@ const TbmTransferModel = {
 
       // 2. dest 세션에서 작업자 work_hours 감소 (또는 삭제)
       const [destRows] = await conn.query(
-        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-        [t.dest_session_id, t.worker_id]
+        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+        [t.dest_session_id, t.user_id]
       );
 
       if (destRows.length > 0) {
@@ -138,29 +138,29 @@ const TbmTransferModel = {
 
         if (newDestHours <= 0) {
           await conn.query(
-            'DELETE FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-            [t.dest_session_id, t.worker_id]
+            'DELETE FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+            [t.dest_session_id, t.user_id]
           );
         } else {
           await conn.query(
-            'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND worker_id = ?',
-            [newDestHours, t.dest_session_id, t.worker_id]
+            'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND user_id = ?',
+            [newDestHours, t.dest_session_id, t.user_id]
           );
         }
       }
 
       // 3. source 세션에서 작업자 work_hours 복원
       const [sourceRows] = await conn.query(
-        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND worker_id = ?',
-        [t.source_session_id, t.worker_id]
+        'SELECT assignment_id, work_hours FROM tbm_team_assignments WHERE session_id = ? AND user_id = ?',
+        [t.source_session_id, t.user_id]
       );
 
       if (sourceRows.length > 0) {
         const sourceHours = sourceRows[0].work_hours === null ? 8 : parseFloat(sourceRows[0].work_hours);
         const restoredHours = sourceHours + parseFloat(t.hours);
         await conn.query(
-          'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND worker_id = ?',
-          [restoredHours >= 8 ? null : restoredHours, t.source_session_id, t.worker_id]
+          'UPDATE tbm_team_assignments SET work_hours = ? WHERE session_id = ? AND user_id = ?',
+          [restoredHours >= 8 ? null : restoredHours, t.source_session_id, t.user_id]
         );
       }
 
@@ -191,11 +191,11 @@ const TbmTransferModel = {
         dl.worker_name as dest_leader_name,
         u.name as initiated_by_name
       FROM tbm_transfers t
-      INNER JOIN workers w ON t.worker_id = w.worker_id
+      INNER JOIN workers w ON t.user_id = w.user_id
       LEFT JOIN tbm_sessions ss ON t.source_session_id = ss.session_id
-      LEFT JOIN workers sl ON ss.leader_id = sl.worker_id
+      LEFT JOIN workers sl ON ss.leader_id = sl.user_id
       LEFT JOIN tbm_sessions ds ON t.dest_session_id = ds.session_id
-      LEFT JOIN workers dl ON ds.leader_id = dl.worker_id
+      LEFT JOIN workers dl ON ds.leader_id = dl.user_id
       LEFT JOIN sso_users u ON t.initiated_by = u.user_id
       WHERE t.transfer_date = ?
       ORDER BY t.created_at DESC
@@ -213,7 +213,7 @@ const TbmTransferModel = {
     // 1. 해당 날짜의 모든 배정 가져오기
     const [assignments] = await db.query(`
       SELECT
-        ta.worker_id,
+        ta.user_id,
         ta.session_id,
         ta.work_hours,
         w.worker_name,
@@ -223,22 +223,22 @@ const TbmTransferModel = {
         s.status as session_status
       FROM tbm_team_assignments ta
       INNER JOIN tbm_sessions s ON ta.session_id = s.session_id
-      INNER JOIN workers w ON ta.worker_id = w.worker_id
-      LEFT JOIN workers lw ON s.leader_id = lw.worker_id
+      INNER JOIN workers w ON ta.user_id = w.user_id
+      LEFT JOIN workers lw ON s.leader_id = lw.user_id
       WHERE s.session_date = ?
       ORDER BY w.worker_name
     `, [date]);
 
     // 2. 모든 작업자 가져오기 (배정 안 된 사람도 포함)
     const [allWorkers] = await db.query(
-      "SELECT worker_id, worker_name, job_type FROM workers WHERE status = 'active' AND department = '생산' ORDER BY worker_name"
+      "SELECT user_id, worker_name, job_type FROM workers WHERE status = 'active' AND department = '생산' ORDER BY worker_name"
     );
 
     // 3. 작업자별 배정 현황 구성
     const workerMap = {};
     allWorkers.forEach(w => {
-      workerMap[w.worker_id] = {
-        worker_id: w.worker_id,
+      workerMap[w.user_id] = {
+        user_id: w.user_id,
         worker_name: w.worker_name,
         job_type: w.job_type,
         sessions: [],
@@ -249,14 +249,14 @@ const TbmTransferModel = {
 
     assignments.forEach(a => {
       const hours = a.work_hours === null ? 8 : parseFloat(a.work_hours);
-      if (workerMap[a.worker_id]) {
-        workerMap[a.worker_id].sessions.push({
+      if (workerMap[a.user_id]) {
+        workerMap[a.user_id].sessions.push({
           session_id: a.session_id,
           leader_name: a.leader_name,
           work_hours: hours,
           session_status: a.session_status
         });
-        workerMap[a.worker_id].total_hours += hours;
+        workerMap[a.user_id].total_hours += hours;
       }
     });
 
diff --git a/system1-factory/api/models/userModel.js b/system1-factory/api/models/userModel.js
index bd4c54f..b59858a 100644
--- a/system1-factory/api/models/userModel.js
+++ b/system1-factory/api/models/userModel.js
@@ -7,7 +7,7 @@ const findByUsername = async (username) => {
         const [rows] = await db.query(
             `SELECT u.user_id, u.username, u.password, u.name, u.email,
                     u.role_id, r.name as role_name,
-                    u._access_level_old as access_level, u.worker_id, u.is_active,
+                    u._access_level_old as access_level, u.is_active,
                     u.last_login_at, u.password_changed_at, u.failed_login_attempts,
                     u.locked_until, u.created_at, u.updated_at
              FROM users u
diff --git a/system1-factory/api/models/vacationBalanceModel.js b/system1-factory/api/models/vacationBalanceModel.js
index 62096d4..87b9c21 100644
--- a/system1-factory/api/models/vacationBalanceModel.js
+++ b/system1-factory/api/models/vacationBalanceModel.js
@@ -9,7 +9,7 @@ const vacationBalanceModel = {
   /**
    * 특정 작업자의 모든 휴가 잔액 조회 (특정 연도)
    */
-  async getByWorkerAndYear(workerId, year) {
+  async getByWorkerAndYear(userId, year) {
     const db = await getDb();
     const [rows] = await db.query(`
       SELECT
@@ -20,16 +20,16 @@ const vacationBalanceModel = {
         vt.is_special
       FROM vacation_balance_details vbd
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
-      WHERE vbd.worker_id = ? AND vbd.year = ?
+      WHERE vbd.user_id = ? AND vbd.year = ?
       ORDER BY vt.priority ASC, vt.type_name ASC
-    `, [workerId, year]);
+    `, [userId, year]);
     return rows;
   },
 
   /**
    * 특정 작업자의 특정 휴가 유형 잔액 조회
    */
-  async getByWorkerTypeYear(workerId, vacationTypeId, year) {
+  async getByWorkerTypeYear(userId, vacationTypeId, year) {
     const db = await getDb();
     const [rows] = await db.query(`
       SELECT
@@ -38,10 +38,10 @@ const vacationBalanceModel = {
         vt.type_code
       FROM vacation_balance_details vbd
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
-      WHERE vbd.worker_id = ?
+      WHERE vbd.user_id = ?
         AND vbd.vacation_type_id = ?
         AND vbd.year = ?
-    `, [workerId, vacationTypeId, year]);
+    `, [userId, vacationTypeId, year]);
     return rows;
   },
 
@@ -59,7 +59,7 @@ const vacationBalanceModel = {
         vt.type_code,
         vt.priority
       FROM vacation_balance_details vbd
-      INNER JOIN workers w ON vbd.worker_id = w.worker_id
+      INNER JOIN workers w ON vbd.user_id = w.user_id
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
       WHERE vbd.year = ?
         AND w.employment_status = 'employed'
@@ -98,39 +98,39 @@ const vacationBalanceModel = {
   /**
    * 작업자의 휴가 사용 일수 업데이트 (차감)
    */
-  async deductDays(workerId, vacationTypeId, year, daysToDeduct) {
+  async deductDays(userId, vacationTypeId, year, daysToDeduct) {
     const db = await getDb();
     const [result] = await db.query(`
       UPDATE vacation_balance_details
       SET used_days = used_days + ?,
           updated_at = NOW()
-      WHERE worker_id = ?
+      WHERE user_id = ?
         AND vacation_type_id = ?
         AND year = ?
-    `, [daysToDeduct, workerId, vacationTypeId, year]);
+    `, [daysToDeduct, userId, vacationTypeId, year]);
     return result;
   },
 
   /**
    * 작업자의 휴가 사용 일수 복구 (취소)
    */
-  async restoreDays(workerId, vacationTypeId, year, daysToRestore) {
+  async restoreDays(userId, vacationTypeId, year, daysToRestore) {
     const db = await getDb();
     const [result] = await db.query(`
       UPDATE vacation_balance_details
       SET used_days = GREATEST(0, used_days - ?),
           updated_at = NOW()
-      WHERE worker_id = ?
+      WHERE user_id = ?
         AND vacation_type_id = ?
         AND year = ?
-    `, [daysToRestore, workerId, vacationTypeId, year]);
+    `, [daysToRestore, userId, vacationTypeId, year]);
     return result;
   },
 
   /**
    * 특정 작업자의 사용 가능한 휴가 일수 확인
    */
-  async getAvailableVacationDays(workerId, year) {
+  async getAvailableVacationDays(userId, year) {
     const db = await getDb();
     const [rows] = await db.query(`
       SELECT
@@ -144,11 +144,11 @@ const vacationBalanceModel = {
         vbd.remaining_days
       FROM vacation_balance_details vbd
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
-      WHERE vbd.worker_id = ?
+      WHERE vbd.user_id = ?
         AND vbd.year = ?
         AND vbd.remaining_days > 0
       ORDER BY vt.priority ASC
-    `, [workerId, year]);
+    `, [userId, year]);
     return rows;
   },
 
@@ -162,11 +162,11 @@ const vacationBalanceModel = {
 
     const db = await getDb();
     const query = `INSERT INTO vacation_balance_details
-      (worker_id, vacation_type_id, year, total_days, used_days, notes, created_by)
+      (user_id, vacation_type_id, year, total_days, used_days, notes, created_by)
       VALUES ?`;
 
     const values = balances.map(b => [
-      b.worker_id,
+      b.user_id,
       b.vacation_type_id,
       b.year,
       b.total_days || 0,
@@ -202,7 +202,7 @@ const vacationBalanceModel = {
   /**
    * 휴가 사용 시 우선순위에 따라 잔액에서 차감
    */
-  async deductByPriority(workerId, year, daysToDeduct) {
+  async deductByPriority(userId, year, daysToDeduct) {
     const db = await getDb();
 
     const [balances] = await db.query(`
@@ -211,13 +211,13 @@ const vacationBalanceModel = {
              vt.type_code, vt.type_name, vt.priority
       FROM vacation_balance_details vbd
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
-      WHERE vbd.worker_id = ? AND vbd.year = ?
+      WHERE vbd.user_id = ? AND vbd.year = ?
         AND (vbd.total_days - vbd.used_days) > 0
       ORDER BY vt.priority ASC
-    `, [workerId, year]);
+    `, [userId, year]);
 
     if (balances.length === 0) {
-      console.warn(`[VacationBalance] 작업자 ${workerId}의 ${year}년 휴가 잔액이 없습니다`);
+      console.warn(`[VacationBalance] 작업자 ${userId}의 ${year}년 휴가 잔액이 없습니다`);
       return { success: false, message: '휴가 잔액이 없습니다', deducted: 0 };
     }
 
@@ -248,14 +248,14 @@ const vacationBalanceModel = {
       }
     }
 
-    console.log(`[VacationBalance] 작업자 ${workerId}: ${daysToDeduct}일 차감 완료`, deductions);
+    console.log(`[VacationBalance] 작업자 ${userId}: ${daysToDeduct}일 차감 완료`, deductions);
     return { success: true, deductions, totalDeducted: daysToDeduct - remaining };
   },
 
   /**
    * 휴가 취소 시 우선순위 역순으로 복구
    */
-  async restoreByPriority(workerId, year, daysToRestore) {
+  async restoreByPriority(userId, year, daysToRestore) {
     const db = await getDb();
 
     const [balances] = await db.query(`
@@ -263,10 +263,10 @@ const vacationBalanceModel = {
              vt.type_code, vt.type_name, vt.priority
       FROM vacation_balance_details vbd
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
-      WHERE vbd.worker_id = ? AND vbd.year = ?
+      WHERE vbd.user_id = ? AND vbd.year = ?
         AND vbd.used_days > 0
       ORDER BY vt.priority DESC
-    `, [workerId, year]);
+    `, [userId, year]);
 
     let remaining = daysToRestore;
     const restorations = [];
@@ -295,7 +295,7 @@ const vacationBalanceModel = {
       }
     }
 
-    console.log(`[VacationBalance] 작업자 ${workerId}: ${daysToRestore}일 복구 완료`, restorations);
+    console.log(`[VacationBalance] 작업자 ${userId}: ${daysToRestore}일 복구 완료`, restorations);
     return { success: true, restorations, totalRestored: daysToRestore - remaining };
   },
 
@@ -311,7 +311,7 @@ const vacationBalanceModel = {
         vt.type_name,
         vt.type_code
       FROM vacation_balance_details vbd
-      INNER JOIN workers w ON vbd.worker_id = w.worker_id
+      INNER JOIN workers w ON vbd.user_id = w.user_id
       INNER JOIN vacation_types vt ON vbd.vacation_type_id = vt.id
       WHERE vbd.id = ?
     `, [id]);
diff --git a/system1-factory/api/models/vacationRequestModel.js b/system1-factory/api/models/vacationRequestModel.js
index 75cae22..0e032c4 100644
--- a/system1-factory/api/models/vacationRequestModel.js
+++ b/system1-factory/api/models/vacationRequestModel.js
@@ -30,7 +30,7 @@ const vacationRequestModel = {
         requester.name as requester_name,
         reviewer.name as reviewer_name
       FROM vacation_requests vr
-      INNER JOIN workers w ON vr.worker_id = w.worker_id
+      INNER JOIN workers w ON vr.user_id = w.user_id
       INNER JOIN vacation_types vt ON vr.vacation_type_id = vt.id
       LEFT JOIN users requester ON vr.requested_by = requester.user_id
       LEFT JOIN users reviewer ON vr.reviewed_by = reviewer.user_id
@@ -39,9 +39,9 @@ const vacationRequestModel = {
 
     const params = [];
 
-    if (filters.worker_id) {
-      query += ` AND vr.worker_id = ?`;
-      params.push(filters.worker_id);
+    if (filters.user_id) {
+      query += ` AND vr.user_id = ?`;
+      params.push(filters.user_id);
     }
     if (filters.status) {
       query += ` AND vr.status = ?`;
@@ -85,7 +85,7 @@ const vacationRequestModel = {
         reviewer.name as reviewer_name,
         reviewer.username as reviewer_username
       FROM vacation_requests vr
-      INNER JOIN workers w ON vr.worker_id = w.worker_id
+      INNER JOIN workers w ON vr.user_id = w.user_id
       INNER JOIN vacation_types vt ON vr.vacation_type_id = vt.id
       LEFT JOIN users requester ON vr.requested_by = requester.user_id
       LEFT JOIN users reviewer ON vr.reviewed_by = reviewer.user_id
@@ -128,35 +128,35 @@ const vacationRequestModel = {
   /**
    * 특정 작업자의 대기 중인 휴가 신청 수
    */
-  async getPendingCount(workerId) {
+  async getPendingCount(userId) {
     const db = await getDb();
     const [rows] = await db.query(`
       SELECT COUNT(*) as count FROM vacation_requests
-      WHERE worker_id = ? AND status = 'pending'
-    `, [workerId]);
+      WHERE user_id = ? AND status = 'pending'
+    `, [userId]);
     return rows;
   },
 
   /**
    * 특정 작업자의 승인된 휴가 일수 합계 (특정 기간)
    */
-  async getApprovedDaysInPeriod(workerId, startDate, endDate) {
+  async getApprovedDaysInPeriod(userId, startDate, endDate) {
     const db = await getDb();
     const [rows] = await db.query(`
       SELECT COALESCE(SUM(days_used), 0) as total_days FROM vacation_requests
-      WHERE worker_id = ? AND status = 'approved' AND start_date >= ? AND end_date <= ?
-    `, [workerId, startDate, endDate]);
+      WHERE user_id = ? AND status = 'approved' AND start_date >= ? AND end_date <= ?
+    `, [userId, startDate, endDate]);
     return rows;
   },
 
   /**
    * 휴가 기간 중복 체크
    */
-  async checkOverlap(workerId, startDate, endDate, excludeRequestId = null) {
+  async checkOverlap(userId, startDate, endDate, excludeRequestId = null) {
     const db = await getDb();
     let query = `
       SELECT COUNT(*) as count FROM vacation_requests
-      WHERE worker_id = ?
+      WHERE user_id = ?
         AND status IN ('pending', 'approved')
         AND (
           (start_date <= ? AND end_date >= ?) OR
@@ -164,7 +164,7 @@ const vacationRequestModel = {
           (start_date >= ? AND end_date <= ?)
         )
     `;
-    const params = [workerId, startDate, startDate, endDate, endDate, startDate, endDate];
+    const params = [userId, startDate, startDate, endDate, endDate, startDate, endDate];
 
     if (excludeRequestId) {
       query += ` AND request_id != ?`;
@@ -187,7 +187,7 @@ const vacationRequestModel = {
         vt.type_name as vacation_type_name,
         requester.name as requester_name
       FROM vacation_requests vr
-      INNER JOIN workers w ON vr.worker_id = w.worker_id
+      INNER JOIN workers w ON vr.user_id = w.user_id
       INNER JOIN vacation_types vt ON vr.vacation_type_id = vt.id
       LEFT JOIN users requester ON vr.requested_by = requester.user_id
       WHERE vr.status = 'pending'
diff --git a/system1-factory/api/models/workReportModel.js b/system1-factory/api/models/workReportModel.js
index 3766369..5ca352b 100644
--- a/system1-factory/api/models/workReportModel.js
+++ b/system1-factory/api/models/workReportModel.js
@@ -12,14 +12,14 @@ const createBatch = async (reports) => {
 
     const sql = `
       INSERT INTO WorkReports
-        (\`date\`, worker_id, project_id, task_id, overtime_hours, work_details, memo)
+        (\`date\`, user_id, project_id, task_id, overtime_hours, work_details, memo)
       VALUES (?, ?, ?, ?, ?, ?, ?)
     `;
 
     for (const rpt of reports) {
       const params = [
         rpt.date,
-        rpt.worker_id,
+        rpt.user_id,
         rpt.project_id,
         rpt.task_id || null,
         rpt.overtime_hours || null,
@@ -44,18 +44,18 @@ const createBatch = async (reports) => {
 const create = async (report) => {
   const db = await getDb();
   const {
-    date, worker_id, project_id,
+    date, user_id, project_id,
     task_id, overtime_hours,
     work_details, memo
   } = report;
 
   const [result] = await db.query(
     `INSERT INTO WorkReports
-     (\`date\`, worker_id, project_id, task_id, overtime_hours, work_details, memo)
+     (\`date\`, user_id, project_id, task_id, overtime_hours, work_details, memo)
      VALUES (?, ?, ?, ?, ?, ?, ?)`,
     [
       date,
-      worker_id,
+      user_id,
       project_id,
       task_id || null,
       overtime_hours || null,
@@ -74,7 +74,7 @@ const getAllByDate = async (date) => {
   const db = await getDb();
   const sql = `
     SELECT
-      wr.worker_id,
+      wr.user_id,
       wr.id,
       wr.\`date\`,
       w.worker_name,
@@ -84,7 +84,7 @@ const getAllByDate = async (date) => {
       wr.work_details,
       wr.memo
     FROM WorkReports wr
-    LEFT JOIN workers w  ON wr.worker_id  = w.worker_id
+    LEFT JOIN workers w  ON wr.user_id  = w.user_id
     LEFT JOIN projects p ON wr.project_id = p.project_id
     LEFT JOIN Tasks t    ON wr.task_id    = t.task_id
     WHERE wr.\`date\` = ?
@@ -100,7 +100,7 @@ const getAllByDate = async (date) => {
 const getByRange = async (start, end) => {
   const db = await getDb();
   const [rows] = await db.query(
-    `SELECT id, \`date\`, worker_id, project_id, morning_task_id, afternoon_task_id, overtime_hours, overtime_task_id, work_details, note, memo, created_at, updated_at, morning_project_id, afternoon_project_id, overtime_project_id, task_id FROM WorkReports
+    `SELECT id, \`date\`, user_id, project_id, morning_task_id, afternoon_task_id, overtime_hours, overtime_task_id, work_details, note, memo, created_at, updated_at, morning_project_id, afternoon_project_id, overtime_project_id, task_id FROM WorkReports
      WHERE \`date\` BETWEEN ? AND ?
      ORDER BY \`date\` ASC`,
     [start, end]
@@ -114,7 +114,7 @@ const getByRange = async (start, end) => {
 const getById = async (id) => {
   const db = await getDb();
   const [rows] = await db.query(
-    `SELECT id, \`date\`, worker_id, project_id, morning_task_id, afternoon_task_id, overtime_hours, overtime_task_id, work_details, note, memo, created_at, updated_at, morning_project_id, afternoon_project_id, overtime_project_id, task_id FROM WorkReports WHERE id = ?`,
+    `SELECT id, \`date\`, user_id, project_id, morning_task_id, afternoon_task_id, overtime_hours, overtime_task_id, work_details, note, memo, created_at, updated_at, morning_project_id, afternoon_project_id, overtime_project_id, task_id FROM WorkReports WHERE id = ?`,
     [id]
   );
   return rows[0];
@@ -126,7 +126,7 @@ const getById = async (id) => {
 const update = async (id, report) => {
   const db = await getDb();
   const {
-    date, worker_id, project_id,
+    date, user_id, project_id,
     task_id, overtime_hours,
     work_details, memo
   } = report;
@@ -134,7 +134,7 @@ const update = async (id, report) => {
   const [result] = await db.query(
     `UPDATE WorkReports
      SET \`date\`         = ?,
-         worker_id       = ?,
+         user_id         = ?,
          project_id      = ?,
          task_id         = ?,
          overtime_hours  = ?,
@@ -144,7 +144,7 @@ const update = async (id, report) => {
      WHERE id = ?`,
     [
       date,
-      worker_id,
+      user_id,
       project_id,
       task_id || null,
       overtime_hours || null,
@@ -172,11 +172,11 @@ const remove = async (id) => {
 /**
  * 8. 중복 확인
  */
-const existsByDateAndWorker = async (date, worker_id) => {
+const existsByDateAndWorker = async (date, user_id) => {
   const db = await getDb();
   const [rows] = await db.query(
-    `SELECT 1 FROM WorkReports WHERE \`date\` = ? AND worker_id = ? LIMIT 1`,
-    [date, worker_id]
+    `SELECT 1 FROM WorkReports WHERE \`date\` = ? AND user_id = ? LIMIT 1`,
+    [date, user_id]
   );
   return rows.length > 0;
 };
diff --git a/system1-factory/api/models/workerModel.js b/system1-factory/api/models/workerModel.js
index b549750..bb1315b 100644
--- a/system1-factory/api/models/workerModel.js
+++ b/system1-factory/api/models/workerModel.js
@@ -39,39 +39,60 @@ const getAll = async () => {
   const [rows] = await db.query(`
     SELECT
       w.*,
+      w.user_id,
       CASE WHEN w.status = 'active' THEN 1 ELSE 0 END AS is_active,
-      u.user_id,
+      su.username,
       d.department_name
     FROM workers w
-    LEFT JOIN users u ON w.worker_id = u.worker_id
+    LEFT JOIN sso_users su ON w.user_id = su.user_id
     LEFT JOIN departments d ON w.department_id = d.department_id
-    ORDER BY w.worker_id DESC
+    ORDER BY w.worker_name ASC
   `);
   return rows;
 };
 
-// 3. 단일 조회
+// 3. 단일 조회 (worker_id 기준 - 하위 호환성 유지)
 const getById = async (worker_id) => {
   const db = await getDb();
   const [rows] = await db.query(`
     SELECT
       w.*,
+      w.user_id,
       CASE WHEN w.status = 'active' THEN 1 ELSE 0 END AS is_active,
-      u.user_id,
+      su.username,
       d.department_name
     FROM workers w
-    LEFT JOIN users u ON w.worker_id = u.worker_id
+    LEFT JOIN sso_users su ON w.user_id = su.user_id
     LEFT JOIN departments d ON w.department_id = d.department_id
     WHERE w.worker_id = ?
   `, [worker_id]);
   return rows[0];
 };
 
-// 4. 작업자 수정
+// 3-1. 단일 조회 (user_id 기준)
+const getByUserId = async (userId) => {
+  const db = await getDb();
+  const [rows] = await db.query(`
+    SELECT
+      w.*,
+      w.user_id,
+      CASE WHEN w.status = 'active' THEN 1 ELSE 0 END AS is_active,
+      su.username,
+      d.department_name
+    FROM workers w
+    LEFT JOIN sso_users su ON w.user_id = su.user_id
+    LEFT JOIN departments d ON w.department_id = d.department_id
+    WHERE w.user_id = ?
+  `, [userId]);
+  return rows[0];
+};
+
+// 4. 작업자 수정 (worker_id 또는 user_id 기준)
 const update = async (worker) => {
   const db = await getDb();
   const {
     worker_id,
+    user_id,
     worker_name,
     job_type,
     status,
@@ -123,12 +144,22 @@ const update = async (worker) => {
     throw new Error('업데이트할 필드가 없습니다');
   }
 
-  values.push(worker_id); // WHERE 조건용
+  // WHERE 조건: user_id 우선, 없으면 worker_id 사용
+  let whereClause;
+  if (user_id !== undefined) {
+    whereClause = 'user_id = ?';
+    values.push(user_id);
+  } else if (worker_id !== undefined) {
+    whereClause = 'worker_id = ?';
+    values.push(worker_id);
+  } else {
+    throw new Error('worker_id 또는 user_id가 필요합니다');
+  }
 
-  const query = `UPDATE workers SET ${updates.join(', ')} WHERE worker_id = ?`;
+  const query = `UPDATE workers SET ${updates.join(', ')} WHERE ${whereClause}`;
 
-  console.log('🔍 실행할 SQL:', query);
-  console.log('🔍 SQL 파라미터:', values);
+  console.log('실행할 SQL:', query);
+  console.log('SQL 파라미터:', values);
 
   const [result] = await db.query(query, values);
 
@@ -192,6 +223,7 @@ module.exports = {
   create,
   getAll,
   getById,
+  getByUserId,
   update,
   remove
 };
diff --git a/system1-factory/api/public/pages/work_analysis_dashboard.html b/system1-factory/api/public/pages/work_analysis_dashboard.html
index 6aa8cd3..79506e0 100644
--- a/system1-factory/api/public/pages/work_analysis_dashboard.html
+++ b/system1-factory/api/public/pages/work_analysis_dashboard.html
@@ -539,7 +539,7 @@
             charts.workerStats = new Chart(ctx, {
                 type: 'bar',
                 data: {
-                    labels: data.map(item => `작업자 ${item.worker_id}`),
+                    labels: data.map(item => `작업자 ${item.user_id}`),
                     datasets: [{
                         label: '총 작업시간',
                         data: data.map(item => item.totalHours),
@@ -666,7 +666,7 @@
                         ${data.map(item => `
                             <tr>
                                 <td>${item.report_date}</td>
-                                <td>작업자 ${item.worker_id}</td>
+                                <td>작업자 ${item.user_id}</td>
                                 <td>프로젝트 ${item.project_id}</td>
                                 <td>유형 ${item.work_type_id}</td>
                                 <td>${item.work_hours}시간</td>
diff --git a/system1-factory/api/routes/attendanceRoutes.js b/system1-factory/api/routes/attendanceRoutes.js
index 99e4c6b..d65f4c5 100644
--- a/system1-factory/api/routes/attendanceRoutes.js
+++ b/system1-factory/api/routes/attendanceRoutes.js
@@ -32,7 +32,7 @@ router.get('/attendance-types', AttendanceController.getAttendanceTypes);
 router.get('/vacation-types', AttendanceController.getVacationTypes);
 
 // 작업자 휴가 잔여 조회
-router.get('/vacation-balance/:worker_id', AttendanceController.getWorkerVacationBalance);
+router.get('/vacation-balance/:user_id', AttendanceController.getWorkerVacationBalance);
 
 // 월별 근태 통계
 router.get('/monthly-stats', AttendanceController.getMonthlyAttendanceStats);
diff --git a/system1-factory/api/routes/dailyWorkReportRoutes.js b/system1-factory/api/routes/dailyWorkReportRoutes.js
index f805c57..0dc64bc 100644
--- a/system1-factory/api/routes/dailyWorkReportRoutes.js
+++ b/system1-factory/api/routes/dailyWorkReportRoutes.js
@@ -26,22 +26,22 @@ router.put('/error-types/:id', dailyWorkReportController.updateErrorType);
 router.delete('/error-types/:id', dailyWorkReportController.deleteErrorType);
 
 // 🔄 누적 관련 새로운 라우트들 (누적입력 시스템 전용)
-router.get('/accumulated', dailyWorkReportController.getAccumulatedReports);          // ?date=2024-06-16&worker_id=1
-router.get('/contributors', dailyWorkReportController.getContributorsSummary);       // ?date=2024-06-16&worker_id=1
-router.get('/my-data', dailyWorkReportController.getMyAccumulatedData);              // ?date=2024-06-16&worker_id=1
+router.get('/accumulated', dailyWorkReportController.getAccumulatedReports);          // ?date=2024-06-16&user_id=1
+router.get('/contributors', dailyWorkReportController.getContributorsSummary);       // ?date=2024-06-16&user_id=1
+router.get('/my-data', dailyWorkReportController.getMyAccumulatedData);              // ?date=2024-06-16&user_id=1
 
 // ✅ check-overwrite 엔드포인트 추가 (누락된 엔드포인트)
 router.get('/check-overwrite', (req, res) => {
-  const { date, worker_id } = req.query;
-  
-  if (!date || !worker_id) {
-    return res.status(400).json({ 
-      error: 'date와 worker_id가 필요합니다.',
-      example: 'date=2025-06-16&worker_id=1'
+  const { date, user_id } = req.query;
+
+  if (!date || !user_id) {
+    return res.status(400).json({
+      error: 'date와 user_id가 필요합니다.',
+      example: 'date=2025-06-16&user_id=1'
     });
   }
 
-  console.log(`🔍 덮어쓰기 권한 확인: 날짜=${date}, 작업자=${worker_id} (누적입력모드)`);
+  console.log(`🔍 덮어쓰기 권한 확인: 날짜=${date}, 작업자=${user_id} (누적입력모드)`);
 
   // 누적입력 시스템에서는 항상 덮어쓰기 가능 (실제로는 누적만 함)
   res.json({
@@ -49,7 +49,7 @@ router.get('/check-overwrite', (req, res) => {
     reason: 'accumulate_mode',
     message: '누적입력 모드에서는 항상 추가 가능합니다.',
     date,
-    worker_id,
+    user_id,
     timestamp: new Date().toISOString()
   });
 });
@@ -84,7 +84,7 @@ router.get('/', dailyWorkReportController.getDailyWorkReports);
 router.put('/:id', dailyWorkReportController.updateWorkReport);
 
 // 🗑️ 작업자의 특정 날짜 전체 삭제
-router.delete('/date/:date/worker/:worker_id', dailyWorkReportController.removeDailyWorkReportByDateAndWorker);
+router.delete('/date/:date/worker/:user_id', dailyWorkReportController.removeDailyWorkReportByDateAndWorker);
 
 // 🗑️ 특정 작업보고서 삭제 (항상 가장 마지막에 정의)
 router.delete('/:id', dailyWorkReportController.removeDailyWorkReport);
diff --git a/system1-factory/api/routes/systemRoutes.js b/system1-factory/api/routes/systemRoutes.js
index ff5cd22..6e8306d 100644
--- a/system1-factory/api/routes/systemRoutes.js
+++ b/system1-factory/api/routes/systemRoutes.js
@@ -231,7 +231,7 @@ router.post('/migrations/fix-work-type-id', async (req, res) => {
         dwr.report_date
       FROM daily_work_reports dwr
       INNER JOIN tbm_team_assignments ta ON dwr.tbm_assignment_id = ta.assignment_id
-      INNER JOIN workers w ON dwr.worker_id = w.worker_id
+      INNER JOIN workers w ON dwr.user_id = w.user_id
       WHERE dwr.tbm_assignment_id IS NOT NULL
         AND ta.task_id IS NOT NULL
         AND dwr.work_type_id != ta.task_id
@@ -271,7 +271,7 @@ router.post('/migrations/fix-work-type-id', async (req, res) => {
       INNER JOIN tbm_team_assignments ta ON dwr.tbm_assignment_id = ta.assignment_id
       LEFT JOIN tasks t ON dwr.work_type_id = t.task_id
       LEFT JOIN work_types wt ON t.work_type_id = wt.id
-      LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+      LEFT JOIN workers w ON dwr.user_id = w.user_id
       WHERE dwr.tbm_assignment_id IS NOT NULL
       ORDER BY dwr.report_date DESC
       LIMIT 10
diff --git a/system1-factory/api/routes/tbmRoutes.js b/system1-factory/api/routes/tbmRoutes.js
index 2b21464..03fd87c 100644
--- a/system1-factory/api/routes/tbmRoutes.js
+++ b/system1-factory/api/routes/tbmRoutes.js
@@ -48,7 +48,7 @@ router.get('/sessions/:sessionId/team', requireAuth, TbmController.getTeamMember
 router.delete('/sessions/:sessionId/team/clear', requireAuth, TbmController.clearAllTeamMembers);
 
 // 팀원 제거
-router.delete('/sessions/:sessionId/team/:workerId', requireAuth, TbmController.removeTeamMember);
+router.delete('/sessions/:sessionId/team/:userId', requireAuth, TbmController.removeTeamMember);
 
 // ==================== 안전 체크리스트 관련 ====================
 
diff --git a/system1-factory/api/routes/userRoutes.js b/system1-factory/api/routes/userRoutes.js
index 4e6a93a..7e296be 100644
--- a/system1-factory/api/routes/userRoutes.js
+++ b/system1-factory/api/routes/userRoutes.js
@@ -59,7 +59,7 @@ router.get('/me/attendance-records', async (req, res) => {
     const AttendanceModel = require('../models/attendanceModel');
     const startDate = `${year}-${String(month).padStart(2, '0')}-01`;
     const endDate = `${year}-${String(month).padStart(2, '0')}-31`;
-    const records = await AttendanceModel.getDailyRecords(startDate, endDate, req.user.worker_id);
+    const records = await AttendanceModel.getDailyRecords(startDate, endDate, req.user.user_id);
     res.json({ success: true, data: records });
   } catch (error) {
     res.status(500).json({ success: false, error: error.message });
@@ -71,7 +71,7 @@ router.get('/me/vacation-balance', async (req, res) => {
   try {
     const AttendanceModel = require('../models/attendanceModel');
     const year = req.query.year || new Date().getFullYear();
-    const balance = await AttendanceModel.getWorkerVacationBalance(req.user.worker_id, year);
+    const balance = await AttendanceModel.getWorkerVacationBalance(req.user.user_id, year);
     res.json({ success: true, data: balance });
   } catch (error) {
     res.status(500).json({ success: false, error: error.message });
@@ -84,8 +84,8 @@ router.get('/me/work-reports', async (req, res) => {
     const { startDate, endDate } = req.query;
     const db = require('../config/database');
     const reports = await db.query(
-      'SELECT * FROM daily_work_reports WHERE worker_id = ? AND report_date BETWEEN ? AND ? ORDER BY report_date DESC',
-      [req.user.worker_id, startDate, endDate]
+      'SELECT * FROM daily_work_reports WHERE user_id = ? AND report_date BETWEEN ? AND ? ORDER BY report_date DESC',
+      [req.user.user_id, startDate, endDate]
     );
     res.json({ success: true, data: reports });
   } catch (error) {
@@ -104,8 +104,8 @@ router.get('/me/monthly-stats', async (req, res) => {
         SUM(total_work_hours) as month_hours,
         COUNT(DISTINCT record_date) as work_days
       FROM daily_attendance_records
-      WHERE worker_id = ? AND YEAR(record_date) = ? AND MONTH(record_date) = ?`,
-      [req.user.worker_id, year, month]
+      WHERE user_id = ? AND YEAR(record_date) = ? AND MONTH(record_date) = ?`,
+      [req.user.user_id, year, month]
     );
     res.json({ success: true, data: stats[0] || { month_hours: 0, work_days: 0 } });
   } catch (error) {
diff --git a/system1-factory/api/routes/vacationBalanceRoutes.js b/system1-factory/api/routes/vacationBalanceRoutes.js
index e44872f..f0f5f58 100644
--- a/system1-factory/api/routes/vacationBalanceRoutes.js
+++ b/system1-factory/api/routes/vacationBalanceRoutes.js
@@ -11,10 +11,10 @@ const vacationBalanceController = require('../controllers/vacationBalanceControl
 router.get('/year/:year', vacationBalanceController.getAllByYear);
 
 // 특정 작업자의 휴가 잔액 조회 (특정 연도)
-router.get('/worker/:workerId/year/:year', vacationBalanceController.getByWorkerAndYear);
+router.get('/worker/:userId/year/:year', vacationBalanceController.getByWorkerAndYear);
 
 // 작업자의 사용 가능한 휴가 일수 조회
-router.get('/worker/:workerId/year/:year/available', vacationBalanceController.getAvailableDays);
+router.get('/worker/:userId/year/:year/available', vacationBalanceController.getAvailableDays);
 
 // 근속년수 기반 연차 자동 계산 및 생성 (관리자만)
 router.post('/auto-calculate', vacationBalanceController.autoCalculateAndCreate);
diff --git a/system1-factory/api/routes/workerRoutes.js b/system1-factory/api/routes/workerRoutes.js
index 15d5f0e..5677f4f 100644
--- a/system1-factory/api/routes/workerRoutes.js
+++ b/system1-factory/api/routes/workerRoutes.js
@@ -96,7 +96,7 @@ router.get('/', workerController.getAllWorkers);
 
 /**
  * @swagger
- * /api/workers/{worker_id}:
+ * /api/workers/{user_id}:
  *   get:
  *     tags: [Workers]
  *     summary: 특정 작업자 조회
@@ -105,7 +105,7 @@ router.get('/', workerController.getAllWorkers);
  *       - bearerAuth: []
  *     parameters:
  *       - in: path
- *         name: worker_id
+ *         name: user_id
  *         required: true
  *         schema:
  *           type: integer
@@ -142,7 +142,7 @@ router.get('/', workerController.getAllWorkers);
  *       - bearerAuth: []
  *     parameters:
  *       - in: path
- *         name: worker_id
+ *         name: user_id
  *         required: true
  *         schema:
  *           type: integer
@@ -193,7 +193,7 @@ router.get('/', workerController.getAllWorkers);
  *       - bearerAuth: []
  *     parameters:
  *       - in: path
- *         name: worker_id
+ *         name: user_id
  *         required: true
  *         schema:
  *           type: integer
@@ -221,8 +221,8 @@ router.get('/', workerController.getAllWorkers);
  *       500:
  *         description: 서버 오류
  */
-router.get('/:worker_id', workerController.getWorkerById);
-router.put('/:worker_id', workerController.updateWorker);
-router.delete('/:worker_id', workerController.removeWorker);
+router.get('/:user_id', workerController.getWorkerById);
+router.put('/:user_id', workerController.updateWorker);
+router.delete('/:user_id', workerController.removeWorker);
 
 module.exports = router;
\ No newline at end of file
diff --git a/system1-factory/api/services/attendanceService.js b/system1-factory/api/services/attendanceService.js
index 6d6a182..c207724 100644
--- a/system1-factory/api/services/attendanceService.js
+++ b/system1-factory/api/services/attendanceService.js
@@ -53,7 +53,7 @@ const getDailyAttendanceStatusService = async (date) => {
 /**
  * 일일 근태 기록 조회
  */
-const getDailyAttendanceRecordsService = async (date, workerId = null) => {
+const getDailyAttendanceRecordsService = async (date, userId = null) => {
   if (!date) {
     throw new ValidationError('날짜가 필요합니다', {
       required: ['date'],
@@ -61,10 +61,10 @@ const getDailyAttendanceRecordsService = async (date, workerId = null) => {
     });
   }
 
-  logger.info('일일 근태 기록 조회 요청', { date, workerId });
+  logger.info('일일 근태 기록 조회 요청', { date, userId });
 
   try {
-    const records = await AttendanceModel.getDailyAttendanceRecords(date, workerId);
+    const records = await AttendanceModel.getDailyAttendanceRecords(date, userId);
     logger.info('일일 근태 기록 조회 성공', { date, count: records.length });
     return records;
   } catch (error) {
@@ -76,7 +76,7 @@ const getDailyAttendanceRecordsService = async (date, workerId = null) => {
 /**
  * 기간별 근태 기록 조회 (월별 조회용)
  */
-const getAttendanceRecordsByRangeService = async (startDate, endDate, workerId = null) => {
+const getAttendanceRecordsByRangeService = async (startDate, endDate, userId = null) => {
   if (!startDate || !endDate) {
     throw new ValidationError('시작 날짜와 종료 날짜가 필요합니다', {
       required: ['start_date', 'end_date'],
@@ -84,10 +84,10 @@ const getAttendanceRecordsByRangeService = async (startDate, endDate, workerId =
     });
   }
 
-  logger.info('기간별 근태 기록 조회 요청', { startDate, endDate, workerId });
+  logger.info('기간별 근태 기록 조회 요청', { startDate, endDate, userId });
 
   try {
-    const records = await AttendanceModel.getDailyRecords(startDate, endDate, workerId);
+    const records = await AttendanceModel.getDailyRecords(startDate, endDate, userId);
     logger.info('기간별 근태 기록 조회 성공', { startDate, endDate, count: records.length });
     return records;
   } catch (error) {
@@ -103,7 +103,7 @@ const getAttendanceRecordsByRangeService = async (startDate, endDate, workerId =
 const upsertAttendanceRecordService = async (recordData) => {
   const {
     record_date,
-    worker_id,
+    user_id,
     total_work_hours,
     attendance_type_id,
     vacation_type_id,
@@ -115,25 +115,25 @@ const upsertAttendanceRecordService = async (recordData) => {
   } = recordData;
 
   // 필수 필드 검증
-  if (!record_date || !worker_id) {
+  if (!record_date || !user_id) {
     throw new ValidationError('필수 필드가 누락되었습니다', {
-      required: ['record_date', 'worker_id'],
-      received: { record_date, worker_id }
+      required: ['record_date', 'user_id'],
+      received: { record_date, user_id }
     });
   }
 
-  logger.info('근태 기록 저장 요청', { record_date, worker_id, vacation_type_id });
+  logger.info('근태 기록 저장 요청', { record_date, user_id, vacation_type_id });
 
   try {
     // 1. 기존 기록 조회 (휴가 연동을 위해)
-    const existingRecords = await AttendanceModel.getDailyAttendanceRecords(record_date, worker_id);
-    const existingRecord = existingRecords.find(r => r.worker_id === worker_id);
+    const existingRecords = await AttendanceModel.getDailyAttendanceRecords(record_date, user_id);
+    const existingRecord = existingRecords.find(r => r.user_id === user_id);
     const previousVacationTypeId = existingRecord?.vacation_type_id || null;
 
     // 2. 근태 기록 저장
     const result = await AttendanceModel.upsertAttendanceRecord({
       record_date,
-      worker_id,
+      user_id,
       total_work_hours,
       work_attendance_type_id: attendance_type_id,
       vacation_type_id,
@@ -150,21 +150,21 @@ const upsertAttendanceRecordService = async (recordData) => {
     if (previousDays !== newDays) {
       // 이전 휴가 복구
       if (previousDays > 0) {
-        await vacationBalanceModel.restoreByPriority(worker_id, year, previousDays);
-        logger.info('휴가 잔액 복구', { worker_id, year, restored: previousDays });
+        await vacationBalanceModel.restoreByPriority(user_id, year, previousDays);
+        logger.info('휴가 잔액 복구', { user_id, year, restored: previousDays });
       }
 
       // 새 휴가 차감
       if (newDays > 0) {
-        await vacationBalanceModel.deductByPriority(worker_id, year, newDays);
-        logger.info('휴가 잔액 차감', { worker_id, year, deducted: newDays });
+        await vacationBalanceModel.deductByPriority(user_id, year, newDays);
+        logger.info('휴가 잔액 차감', { user_id, year, deducted: newDays });
       }
     }
 
-    logger.info('근태 기록 저장 성공', { record_date, worker_id });
+    logger.info('근태 기록 저장 성공', { record_date, user_id });
     return result;
   } catch (error) {
-    logger.error('근태 기록 저장 실패', { record_date, worker_id, error: error.message });
+    logger.error('근태 기록 저장 실패', { record_date, user_id, error: error.message });
     throw new DatabaseError('근태 기록 저장 중 데이터베이스 오류가 발생했습니다');
   }
 };
@@ -173,28 +173,28 @@ const upsertAttendanceRecordService = async (recordData) => {
  * 휴가 처리
  */
 const processVacationService = async (vacationData) => {
-  const { record_date, worker_id, vacation_type_id } = vacationData;
+  const { record_date, user_id, vacation_type_id } = vacationData;
 
-  if (!record_date || !worker_id || !vacation_type_id) {
+  if (!record_date || !user_id || !vacation_type_id) {
     throw new ValidationError('필수 필드가 누락되었습니다', {
-      required: ['record_date', 'worker_id', 'vacation_type_id'],
-      received: { record_date, worker_id, vacation_type_id }
+      required: ['record_date', 'user_id', 'vacation_type_id'],
+      received: { record_date, user_id, vacation_type_id }
     });
   }
 
-  logger.info('휴가 처리 요청', { record_date, worker_id, vacation_type_id });
+  logger.info('휴가 처리 요청', { record_date, user_id, vacation_type_id });
 
   try {
     const result = await AttendanceModel.processVacation({
       record_date,
-      worker_id,
+      user_id,
       vacation_type_id
     });
 
-    logger.info('휴가 처리 성공', { record_date, worker_id });
+    logger.info('휴가 처리 성공', { record_date, user_id });
     return result;
   } catch (error) {
-    logger.error('휴가 처리 실패', { record_date, worker_id, error: error.message });
+    logger.error('휴가 처리 실패', { record_date, user_id, error: error.message });
     throw new DatabaseError('휴가 처리 중 데이터베이스 오류가 발생했습니다');
   }
 };
@@ -203,28 +203,28 @@ const processVacationService = async (vacationData) => {
  * 초과 근무 승인
  */
 const approveOvertimeService = async (overtimeData) => {
-  const { record_date, worker_id, overtime_approved } = overtimeData;
+  const { record_date, user_id, overtime_approved } = overtimeData;
 
-  if (!record_date || !worker_id || overtime_approved === undefined) {
+  if (!record_date || !user_id || overtime_approved === undefined) {
     throw new ValidationError('필수 필드가 누락되었습니다', {
-      required: ['record_date', 'worker_id', 'overtime_approved'],
-      received: { record_date, worker_id, overtime_approved }
+      required: ['record_date', 'user_id', 'overtime_approved'],
+      received: { record_date, user_id, overtime_approved }
     });
   }
 
-  logger.info('초과 근무 승인 요청', { record_date, worker_id, overtime_approved });
+  logger.info('초과 근무 승인 요청', { record_date, user_id, overtime_approved });
 
   try {
     const result = await AttendanceModel.approveOvertime({
       record_date,
-      worker_id,
+      user_id,
       overtime_approved
     });
 
-    logger.info('초과 근무 승인 처리 성공', { record_date, worker_id });
+    logger.info('초과 근무 승인 처리 성공', { record_date, user_id });
     return result;
   } catch (error) {
-    logger.error('초과 근무 승인 실패', { record_date, worker_id, error: error.message });
+    logger.error('초과 근무 승인 실패', { record_date, user_id, error: error.message });
     throw new DatabaseError('초과 근무 승인 중 데이터베이스 오류가 발생했습니다');
   }
 };
@@ -264,22 +264,22 @@ const getVacationTypesService = async () => {
 /**
  * 작업자 휴가 잔여 일수 조회
  */
-const getWorkerVacationBalanceService = async (workerId) => {
-  if (!workerId) {
+const getWorkerVacationBalanceService = async (userId) => {
+  if (!userId) {
     throw new ValidationError('작업자 ID가 필요합니다', {
-      required: ['worker_id'],
-      received: { workerId }
+      required: ['user_id'],
+      received: { userId }
     });
   }
 
-  logger.info('휴가 잔여 일수 조회 요청', { workerId });
+  logger.info('휴가 잔여 일수 조회 요청', { userId });
 
   try {
-    const balance = await AttendanceModel.getWorkerVacationBalance(workerId);
-    logger.info('휴가 잔여 일수 조회 성공', { workerId });
+    const balance = await AttendanceModel.getWorkerVacationBalance(userId);
+    logger.info('휴가 잔여 일수 조회 성공', { userId });
     return balance;
   } catch (error) {
-    logger.error('휴가 잔여 일수 조회 실패', { workerId, error: error.message });
+    logger.error('휴가 잔여 일수 조회 실패', { userId, error: error.message });
     throw new DatabaseError('휴가 잔여 일수 조회 중 데이터베이스 오류가 발생했습니다');
   }
 };
@@ -287,7 +287,7 @@ const getWorkerVacationBalanceService = async (workerId) => {
 /**
  * 월별 근태 통계 조회
  */
-const getMonthlyAttendanceStatsService = async (year, month, workerId = null) => {
+const getMonthlyAttendanceStatsService = async (year, month, userId = null) => {
   if (!year || !month) {
     throw new ValidationError('연도와 월이 필요합니다', {
       required: ['year', 'month'],
@@ -295,10 +295,10 @@ const getMonthlyAttendanceStatsService = async (year, month, workerId = null) =>
     });
   }
 
-  logger.info('월별 근태 통계 조회 요청', { year, month, workerId });
+  logger.info('월별 근태 통계 조회 요청', { year, month, userId });
 
   try {
-    const stats = await AttendanceModel.getMonthlyAttendanceStats(year, month, workerId);
+    const stats = await AttendanceModel.getMonthlyAttendanceStats(year, month, userId);
     logger.info('월별 근태 통계 조회 성공', { year, month });
     return stats;
   } catch (error) {
@@ -347,21 +347,21 @@ const saveCheckinsService = async (date, checkins) => {
     const results = [];
 
     for (const checkin of checkins) {
-      const { worker_id, is_present } = checkin;
+      const { user_id, is_present } = checkin;
 
-      if (!worker_id || is_present === undefined) {
+      if (!user_id || is_present === undefined) {
         logger.warn('출근 체크 데이터 누락', { checkin });
         continue;
       }
 
       const result = await AttendanceModel.upsertCheckin({
-        worker_id,
+        user_id,
         record_date: date,
         is_present
       });
 
       results.push({
-        worker_id,
+        user_id,
         record_id: result,
         is_present
       });
diff --git a/system1-factory/api/services/auth.service.js b/system1-factory/api/services/auth.service.js
index a7481b4..ce013b6 100644
--- a/system1-factory/api/services/auth.service.js
+++ b/system1-factory/api/services/auth.service.js
@@ -57,7 +57,7 @@ const loginService = async (username, password, ipAddress, userAgent) => {
 
 
     const token = jwt.sign(
-      { user_id: user.user_id, username: user.username, role: user.role_name, role_id: user.role_id, access_level: user.access_level, worker_id: user.worker_id, name: user.name || user.username },
+      { user_id: user.user_id, username: user.username, role: user.role_name, role_id: user.role_id, access_level: user.access_level, name: user.name || user.username },
       process.env.JWT_SECRET || 'your-secret-key',
       { expiresIn: process.env.JWT_EXPIRES_IN || '24h' }
     );
@@ -81,8 +81,7 @@ const loginService = async (username, password, ipAddress, userAgent) => {
           username: user.username,
           name: user.name || user.username,
           role: user.role_name,
-          access_level: user.access_level,
-          worker_id: user.worker_id
+          access_level: user.access_level
         }
       }
     };
diff --git a/system1-factory/api/services/dailyIssueReportService.js b/system1-factory/api/services/dailyIssueReportService.js
index f8e8f92..e776c63 100644
--- a/system1-factory/api/services/dailyIssueReportService.js
+++ b/system1-factory/api/services/dailyIssueReportService.js
@@ -22,23 +22,23 @@ const logger = require('../utils/logger');
  * @param {string} issueData.start_time - 이슈 시작 시간
  * @param {string} issueData.end_time - 이슈 종료 시간
  * @param {number} issueData.issue_type_id - 이슈 유형 ID
- * @param {number[]} issueData.worker_ids - 작업자 ID 배열
+ * @param {number[]} issueData.user_ids - 작업자 ID 배열
  * @returns {Promise<object>} 생성 결과
  */
 const createDailyIssueReportService = async (issueData) => {
-  const { date, project_id, start_time, end_time, issue_type_id, worker_ids } = issueData;
+  const { date, project_id, start_time, end_time, issue_type_id, user_ids } = issueData;
 
   // 필수 필드 검증
-  if (!date || !project_id || !start_time || !end_time || !issue_type_id || !worker_ids) {
+  if (!date || !project_id || !start_time || !end_time || !issue_type_id || !user_ids) {
     throw new ValidationError('필수 필드가 누락되었습니다', {
-      required: ['date', 'project_id', 'start_time', 'end_time', 'issue_type_id', 'worker_ids'],
-      received: { date, project_id, start_time, end_time, issue_type_id, worker_ids: !!worker_ids }
+      required: ['date', 'project_id', 'start_time', 'end_time', 'issue_type_id', 'user_ids'],
+      received: { date, project_id, start_time, end_time, issue_type_id, user_ids: !!user_ids }
     });
   }
 
-  if (!Array.isArray(worker_ids) || worker_ids.length === 0) {
-    throw new ValidationError('worker_ids는 최소 한 명 이상의 작업자를 포함하는 배열이어야 합니다', {
-      received: { worker_ids, isArray: Array.isArray(worker_ids), length: worker_ids?.length }
+  if (!Array.isArray(user_ids) || user_ids.length === 0) {
+    throw new ValidationError('user_ids는 최소 한 명 이상의 작업자를 포함하는 배열이어야 합니다', {
+      received: { user_ids, isArray: Array.isArray(user_ids), length: user_ids?.length }
     });
   }
 
@@ -46,17 +46,17 @@ const createDailyIssueReportService = async (issueData) => {
     date,
     project_id,
     issue_type_id,
-    worker_count: worker_ids.length
+    worker_count: user_ids.length
   });
 
   // 모델에 전달할 데이터 준비
-  const reportsToCreate = worker_ids.map(worker_id => ({
+  const reportsToCreate = user_ids.map(user_id => ({
     date,
     project_id,
     start_time,
     end_time,
     issue_type_id,
-    worker_id
+    user_id
   }));
 
   try {
@@ -75,7 +75,7 @@ const createDailyIssueReportService = async (issueData) => {
     logger.error('이슈 보고서 생성 실패', {
       date,
       project_id,
-      worker_ids,
+      user_ids,
       error: error.message
     });
     throw new DatabaseError('이슈 보고서 생성 중 오류가 발생했습니다');
diff --git a/system1-factory/api/services/dailyWorkReportService.js b/system1-factory/api/services/dailyWorkReportService.js
index 5b058a3..b29ff11 100644
--- a/system1-factory/api/services/dailyWorkReportService.js
+++ b/system1-factory/api/services/dailyWorkReportService.js
@@ -17,13 +17,13 @@ const logger = require('../utils/logger');
  * @returns {Promise<object>} 생성 결과 또는 에러
  */
 const createDailyWorkReportService = async (reportData) => {
-  const { report_date, worker_id, work_entries, created_by, created_by_name } = reportData;
+  const { report_date, user_id, work_entries, created_by, created_by_name } = reportData;
 
   // 1. 기본 유효성 검사
-  if (!report_date || !worker_id || !work_entries) {
+  if (!report_date || !user_id || !work_entries) {
     throw new ValidationError('필수 필드가 누락되었습니다', {
-      required: ['report_date', 'worker_id', 'work_entries'],
-      received: { report_date, worker_id, work_entries: !!work_entries }
+      required: ['report_date', 'user_id', 'work_entries'],
+      received: { report_date, user_id, work_entries: !!work_entries }
     });
   }
 
@@ -70,7 +70,7 @@ const createDailyWorkReportService = async (reportData) => {
   // 3. 모델에 전달할 데이터 준비
   const modelData = {
     report_date,
-    worker_id: parseInt(worker_id),
+    user_id: parseInt(user_id),
     entries: work_entries.map(entry => ({
       project_id: entry.project_id,
       work_type_id: entry.task_id, // task_id를 work_type_id로 매핑
@@ -83,7 +83,7 @@ const createDailyWorkReportService = async (reportData) => {
 
   logger.info('작업보고서 생성 요청', {
     date: report_date,
-    worker: worker_id,
+    worker: user_id,
     creator: created_by_name,
     entries_count: modelData.entries.length
   });
@@ -117,7 +117,7 @@ const createDailyWorkReportService = async (reportData) => {
  * @returns {Promise<Array>} 조회된 작업 보고서 배열
  */
 const getDailyWorkReportsService = async (queryParams, userInfo) => {
-  const { date, start_date, end_date, worker_id, created_by: requested_created_by, view_all } = queryParams;
+  const { date, start_date, end_date, user_id, created_by: requested_created_by, view_all } = queryParams;
   const { user_id: current_user_id, role } = userInfo;
 
   // 날짜 또는 날짜 범위 중 하나는 필수
@@ -142,8 +142,8 @@ const getDailyWorkReportsService = async (queryParams, userInfo) => {
     options.end_date = end_date;
   }
 
-  if (worker_id) {
-    options.worker_id = parseInt(worker_id);
+  if (user_id) {
+    options.user_id = parseInt(user_id);
   }
   
   // 최종적으로 필터링할 작성자 ID 결정
@@ -285,16 +285,16 @@ const getStatisticsService = async (queryParams) => {
 
 /**
  * 일일 또는 작업자별 작업 요약 정보를 조회하는 비즈니스 로직을 처리합니다.
- * @param {object} queryParams - 컨트롤러에서 전달된 쿼리 파라미터 (date 또는 worker_id)
+ * @param {object} queryParams - 컨트롤러에서 전달된 쿼리 파라미터 (date 또는 user_id)
  * @returns {Promise<object>} 요약 데이터
  */
 const getSummaryService = async (queryParams) => {
-    const { date, worker_id } = queryParams;
+    const { date, user_id } = queryParams;
 
-    if (!date && !worker_id) {
+    if (!date && !user_id) {
         throw new ValidationError('날짜 또는 작업자 ID가 필요합니다', {
-            required: 'date OR worker_id',
-            received: { date, worker_id }
+            required: 'date OR user_id',
+            received: { date, user_id }
         });
     }
 
@@ -304,10 +304,10 @@ const getSummaryService = async (queryParams) => {
             const result = await dailyWorkReportModel.getSummaryByDate(date);
             logger.info('일일 요약 조회 성공', { date });
             return result;
-        } else { // worker_id
-            logger.info('작업자별 요약 조회 요청', { worker_id });
-            const result = await dailyWorkReportModel.getSummaryByWorker(worker_id);
-            logger.info('작업자별 요약 조회 성공', { worker_id });
+        } else { // user_id
+            logger.info('작업자별 요약 조회 요청', { user_id });
+            const result = await dailyWorkReportModel.getSummaryByWorker(user_id);
+            logger.info('작업자별 요약 조회 성공', { user_id });
             return result;
         }
     } catch (error) {
diff --git a/system1-factory/api/utils/queryOptimizer.js b/system1-factory/api/utils/queryOptimizer.js
index e716d0f..d882dae 100644
--- a/system1-factory/api/utils/queryOptimizer.js
+++ b/system1-factory/api/utils/queryOptimizer.js
@@ -286,7 +286,7 @@ const optimizedQueries = {
     let baseQuery = `
       SELECT w.*, d.department_name, COUNT(dwr.id) as report_count
       FROM workers w
-      LEFT JOIN daily_work_reports dwr ON w.worker_id = dwr.worker_id
+      LEFT JOIN daily_work_reports dwr ON w.user_id = dwr.user_id
       LEFT JOIN departments d ON w.department_id = d.department_id
     `;
 
@@ -322,10 +322,10 @@ const optimizedQueries = {
       countQuery += whereClause;
     }
 
-    baseQuery += ' GROUP BY w.worker_id';
+    baseQuery += ' GROUP BY w.user_id';
 
     return executePagedQuery(baseQuery, countQuery, params, {
-      page, limit, orderBy: 'w.worker_id', orderDirection: 'DESC'
+      page, limit, orderBy: 'w.user_id', orderDirection: 'DESC'
     });
   },
 
@@ -362,7 +362,7 @@ const optimizedQueries = {
              wt.name as work_type_name, wst.name as work_status_name,
              et.name as error_type_name, u.name as created_by_name
       FROM daily_work_reports dwr
-      LEFT JOIN workers w ON dwr.worker_id = w.worker_id
+      LEFT JOIN workers w ON dwr.user_id = w.user_id
       LEFT JOIN projects p ON dwr.project_id = p.project_id
       LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
       LEFT JOIN work_status_types wst ON dwr.work_status_id = wst.id
diff --git a/system1-factory/api/utils/validator.js b/system1-factory/api/utils/validator.js
index 66d4f3d..2a776b2 100644
--- a/system1-factory/api/utils/validator.js
+++ b/system1-factory/api/utils/validator.js
@@ -242,14 +242,14 @@ const schemas = {
     password: { required: true, password: true },
     name: { required: true, type: 'string', minLength: 2, maxLength: 100 },
     access_level: { required: true, enum: ['user', 'admin', 'system'] },
-    worker_id: { type: 'integer' }
+    user_id: { type: 'integer' }
   },
   
   // 사용자 업데이트
   updateUser: {
     name: { type: 'string', minLength: 2, maxLength: 100 },
     access_level: { enum: ['user', 'admin', 'system'] },
-    worker_id: { type: 'integer' }
+    user_id: { type: 'integer' }
   },
   
   // 비밀번호 변경
@@ -261,7 +261,7 @@ const schemas = {
   // 일일 작업 보고서 생성 (배열 형태)
   createDailyWorkReport: {
     report_date: { required: true, type: 'date' },
-    worker_id: { required: true, type: 'integer' },
+    user_id: { required: true, type: 'integer' },
     work_entries: { required: true, type: 'array' },
     created_by: { type: 'integer' }
   },
diff --git a/system1-factory/web/js/_deprecated/index.js b/system1-factory/web/js/_deprecated/index.js
new file mode 100644
index 0000000..c51fc59
--- /dev/null
+++ b/system1-factory/web/js/_deprecated/index.js
@@ -0,0 +1,318 @@
+/**
+ * Daily Work Report - Module Loader
+ * 작업보고서 모듈을 초기화하고 연결하는 메인 진입점
+ *
+ * 로드 순서:
+ * 1. state.js - 전역 상태 관리
+ * 2. utils.js - 유틸리티 함수
+ * 3. api.js - API 클라이언트
+ * 4. index.js - 이 파일 (메인 컨트롤러)
+ */
+
+class DailyWorkReportController {
+  constructor() {
+    this.state = window.DailyWorkReportState;
+    this.api = window.DailyWorkReportAPI;
+    this.utils = window.DailyWorkReportUtils;
+    this.initialized = false;
+
+    console.log('[Controller] DailyWorkReportController 생성');
+  }
+
+  /**
+   * 초기화
+   */
+  async init() {
+    if (this.initialized) {
+      console.log('[Controller] 이미 초기화됨');
+      return;
+    }
+
+    console.log('[Controller] 초기화 시작...');
+
+    try {
+      // 이벤트 리스너 설정
+      this.setupEventListeners();
+
+      // 기본 데이터 로드
+      await this.api.loadAllData();
+
+      // TBM 탭이 기본
+      await this.switchTab('tbm');
+
+      this.initialized = true;
+      console.log('[Controller] 초기화 완료');
+
+    } catch (error) {
+      console.error('[Controller] 초기화 실패:', error);
+      window.showMessage?.('초기화 중 오류가 발생했습니다: ' + error.message, 'error');
+    }
+  }
+
+  /**
+   * 이벤트 리스너 설정
+   */
+  setupEventListeners() {
+    // 탭 버튼
+    const tbmBtn = document.getElementById('tbmReportTab');
+    const completedBtn = document.getElementById('completedReportTab');
+
+    if (tbmBtn) {
+      tbmBtn.addEventListener('click', () => this.switchTab('tbm'));
+    }
+    if (completedBtn) {
+      completedBtn.addEventListener('click', () => this.switchTab('completed'));
+    }
+
+    // 완료 보고서 날짜 변경
+    const completedDateInput = document.getElementById('completedReportDate');
+    if (completedDateInput) {
+      completedDateInput.addEventListener('change', () => this.loadCompletedReports());
+    }
+
+    console.log('[Controller] 이벤트 리스너 설정 완료');
+  }
+
+  /**
+   * 탭 전환
+   */
+  async switchTab(tab) {
+    this.state.setCurrentTab(tab);
+
+    const tbmBtn = document.getElementById('tbmReportTab');
+    const completedBtn = document.getElementById('completedReportTab');
+    const tbmSection = document.getElementById('tbmReportSection');
+    const completedSection = document.getElementById('completedReportSection');
+
+    // 모든 탭 버튼 비활성화
+    tbmBtn?.classList.remove('active');
+    completedBtn?.classList.remove('active');
+
+    // 모든 섹션 숨기기
+    if (tbmSection) tbmSection.style.display = 'none';
+    if (completedSection) completedSection.style.display = 'none';
+
+    // 선택된 탭 활성화
+    if (tab === 'tbm') {
+      tbmBtn?.classList.add('active');
+      if (tbmSection) tbmSection.style.display = 'block';
+      await this.loadTbmData();
+    } else if (tab === 'completed') {
+      completedBtn?.classList.add('active');
+      if (completedSection) completedSection.style.display = 'block';
+
+      // 오늘 날짜로 초기화
+      const dateInput = document.getElementById('completedReportDate');
+      if (dateInput) {
+        dateInput.value = this.utils.getKoreaToday();
+      }
+      await this.loadCompletedReports();
+    }
+  }
+
+  /**
+   * TBM 데이터 로드
+   */
+  async loadTbmData() {
+    try {
+      await this.api.loadIncompleteTbms();
+      await this.api.loadDailyIssuesForTbms();
+
+      // 렌더링은 기존 함수 사용 (점진적 마이그레이션)
+      if (typeof window.renderTbmWorkList === 'function') {
+        window.renderTbmWorkList();
+      }
+    } catch (error) {
+      console.error('[Controller] TBM 데이터 로드 오류:', error);
+      window.showMessage?.('TBM 데이터를 불러오는 중 오류가 발생했습니다.', 'error');
+    }
+  }
+
+  /**
+   * 완료 보고서 로드
+   */
+  async loadCompletedReports() {
+    try {
+      const dateInput = document.getElementById('completedReportDate');
+      const date = dateInput?.value || this.utils.getKoreaToday();
+
+      const reports = await this.api.loadCompletedReports(date);
+
+      // 렌더링은 기존 함수 사용
+      if (typeof window.renderCompletedReports === 'function') {
+        window.renderCompletedReports(reports);
+      }
+    } catch (error) {
+      console.error('[Controller] 완료 보고서 로드 오류:', error);
+      window.showMessage?.('완료 보고서를 불러오는 중 오류가 발생했습니다.', 'error');
+    }
+  }
+
+  /**
+   * TBM 작업보고서 제출
+   */
+  async submitTbmWorkReport(index) {
+    try {
+      const tbm = this.state.incompleteTbms[index];
+      if (!tbm) {
+        throw new Error('TBM 데이터를 찾을 수 없습니다.');
+      }
+
+      // 유효성 검사
+      const totalHoursInput = document.getElementById(`totalHours_${index}`);
+      const totalHours = parseFloat(totalHoursInput?.value);
+
+      if (!totalHours || totalHours <= 0) {
+        window.showMessage?.('작업시간을 입력해주세요.', 'warning');
+        return;
+      }
+
+      // 부적합 시간 계산
+      const defects = this.state.tempDefects[index] || [];
+      const errorHours = defects.reduce((sum, d) => sum + (parseFloat(d.defect_hours) || 0), 0);
+      const regularHours = totalHours - errorHours;
+
+      if (regularHours < 0) {
+        window.showMessage?.('부적합 시간이 총 작업시간을 초과할 수 없습니다.', 'warning');
+        return;
+      }
+
+      // API 데이터 구성
+      const user = this.state.getCurrentUser();
+      const reportData = {
+        tbm_session_id: tbm.session_id,
+        tbm_assignment_id: tbm.assignment_id,
+        user_id: tbm.user_id,
+        project_id: tbm.project_id,
+        work_type_id: tbm.work_type_id,
+        report_date: this.utils.formatDateForApi(tbm.session_date),
+        total_hours: totalHours,
+        regular_hours: regularHours,
+        error_hours: errorHours,
+        work_status_id: errorHours > 0 ? 2 : 1,
+        created_by: user?.user_id || user?.id,
+        defects: defects.map(d => ({
+          category_id: d.category_id,
+          item_id: d.item_id,
+          issue_report_id: d.issue_report_id,
+          defect_hours: d.defect_hours,
+          note: d.note
+        }))
+      };
+
+      const result = await this.api.submitTbmWorkReport(reportData);
+
+      window.showSaveResultModal?.(
+        'success',
+        '제출 완료',
+        `${tbm.worker_name}의 작업보고서가 제출되었습니다.`
+      );
+
+      // 목록 새로고침
+      await this.loadTbmData();
+
+    } catch (error) {
+      console.error('[Controller] 제출 오류:', error);
+      window.showSaveResultModal?.(
+        'error',
+        '제출 실패',
+        error.message || '작업보고서 제출 중 오류가 발생했습니다.'
+      );
+    }
+  }
+
+  /**
+   * 세션 일괄 제출
+   */
+  async batchSubmitSession(sessionKey) {
+    const rows = document.querySelectorAll(`tr[data-session-key="${sessionKey}"][data-type="tbm"]`);
+    const indices = [];
+
+    rows.forEach(row => {
+      const index = parseInt(row.dataset.index);
+      const totalHoursInput = document.getElementById(`totalHours_${index}`);
+      if (totalHoursInput?.value && parseFloat(totalHoursInput.value) > 0) {
+        indices.push(index);
+      }
+    });
+
+    if (indices.length === 0) {
+      window.showMessage?.('제출할 항목이 없습니다. 작업시간을 입력해주세요.', 'warning');
+      return;
+    }
+
+    const confirmed = confirm(`${indices.length}건의 작업보고서를 일괄 제출하시겠습니까?`);
+    if (!confirmed) return;
+
+    let successCount = 0;
+    let failCount = 0;
+
+    for (const index of indices) {
+      try {
+        await this.submitTbmWorkReport(index);
+        successCount++;
+      } catch (error) {
+        failCount++;
+        console.error(`[Controller] 일괄 제출 오류 (index: ${index}):`, error);
+      }
+    }
+
+    if (failCount === 0) {
+      window.showSaveResultModal?.('success', '일괄 제출 완료', `${successCount}건이 성공적으로 제출되었습니다.`);
+    } else {
+      window.showSaveResultModal?.('warning', '일괄 제출 부분 완료', `성공: ${successCount}건, 실패: ${failCount}건`);
+    }
+  }
+
+  /**
+   * 상태 디버그
+   */
+  debug() {
+    console.log('[Controller] 상태 디버그:');
+    this.state.debug();
+  }
+}
+
+// 전역 인스턴스 생성
+window.DailyWorkReportController = new DailyWorkReportController();
+
+// 하위 호환성: 기존 전역 함수들
+window.switchTab = (tab) => window.DailyWorkReportController.switchTab(tab);
+window.submitTbmWorkReport = (index) => window.DailyWorkReportController.submitTbmWorkReport(index);
+window.batchSubmitTbmSession = (sessionKey) => window.DailyWorkReportController.batchSubmitSession(sessionKey);
+
+// 사용자 정보 함수
+window.getUser = () => window.DailyWorkReportState.getUser();
+window.getCurrentUser = () => window.DailyWorkReportState.getCurrentUser();
+
+// 날짜 그룹 토글 (UI 함수)
+window.toggleDateGroup = function(dateStr) {
+  const group = document.querySelector(`.date-group[data-date="${dateStr}"]`);
+  if (!group) return;
+
+  const isExpanded = group.classList.contains('expanded');
+  const content = group.querySelector('.date-group-content');
+  const icon = group.querySelector('.date-toggle-icon');
+
+  if (isExpanded) {
+    group.classList.remove('expanded');
+    group.classList.add('collapsed');
+    if (content) content.style.display = 'none';
+    if (icon) icon.textContent = '▶';
+  } else {
+    group.classList.remove('collapsed');
+    group.classList.add('expanded');
+    if (content) content.style.display = 'block';
+    if (icon) icon.textContent = '▼';
+  }
+};
+
+// DOMContentLoaded 이벤트에서 초기화
+document.addEventListener('DOMContentLoaded', () => {
+  // 약간의 지연 후 초기화 (다른 스크립트 로드 대기)
+  setTimeout(() => {
+    window.DailyWorkReportController.init();
+  }, 100);
+});
+
+console.log('[Module] daily-work-report/index.js 로드 완료');
diff --git a/system1-factory/web/js/_deprecated/work-report-api.js b/system1-factory/web/js/_deprecated/work-report-api.js
new file mode 100644
index 0000000..3b23ec9
--- /dev/null
+++ b/system1-factory/web/js/_deprecated/work-report-api.js
@@ -0,0 +1,51 @@
+// /js/work-report-api.js
+import { apiGet, apiPost } from './api-helper.js';
+
+/**
+ * 작업 보고서 작성을 위해 필요한 초기 데이터(작업자, 프로젝트, 태스크)를 가져옵니다.
+ * Promise.all을 사용하여 병렬로 API를 호출합니다.
+ * @returns {Promise<{workers: Array, projects: Array, tasks: Array}>}
+ */
+export async function getInitialData() {
+  try {
+    const [allWorkers, projects, tasks] = await Promise.all([
+      apiGet('/workers'),
+      apiGet('/projects'),
+      apiGet('/tasks')
+    ]);
+
+    // 활성화된 작업자만 필터링
+    const workers = allWorkers.filter(worker => {
+      return worker.status === 'active' || worker.is_active === 1 || worker.is_active === true;
+    });
+
+    // 데이터 형식 검증
+    if (!Array.isArray(workers) || !Array.isArray(projects) || !Array.isArray(tasks)) {
+      throw new Error('서버에서 받은 데이터 형식이 올바르지 않습니다.');
+    }
+
+    // 작업자 목록은 ID 기준으로 정렬
+    workers.sort((a, b) => a.user_id - b.user_id);
+
+    return { workers, projects, tasks };
+  } catch (error) {
+    console.error('초기 데이터 로딩 중 오류 발생:', error);
+    // 에러를 다시 던져서 호출한 쪽에서 처리할 수 있도록 함
+    throw error;
+  }
+}
+
+/**
+ * 작성된 작업 보고서 데이터를 서버에 전송합니다.
+ * @param {Array<object>} reportData - 전송할 작업 보고서 데이터 배열
+ * @returns {Promise<object>} - 서버의 응답 결과
+ */
+export async function createWorkReport(reportData) {
+  try {
+    const result = await apiPost('/workreports', reportData);
+    return result;
+  } catch (error) {
+    console.error('작업 보고서 생성 요청 실패:', error);
+    throw error;
+  }
+} 
\ No newline at end of file
diff --git a/system1-factory/web/js/_deprecated/work-report-create.js b/system1-factory/web/js/_deprecated/work-report-create.js
new file mode 100644
index 0000000..d61ed79
--- /dev/null
+++ b/system1-factory/web/js/_deprecated/work-report-create.js
@@ -0,0 +1,79 @@
+// /js/work-report-create.js
+import { renderCalendar } from './calendar.js';
+import { getInitialData, createWorkReport } from './work-report-api.js';
+import { initializeReportTable, getReportData } from './work-report-ui.js';
+
+// 전역 상태 변수
+let selectedDate = '';
+
+/**
+ * 날짜가 선택되었을 때 실행되는 콜백 함수.
+ * 초기 데이터를 로드하고 테이블을 렌더링합니다.
+ * @param {string} date - 선택된 날짜 (YYYY-MM-DD 형식)
+ */
+async function onDateSelect(date) {
+  selectedDate = date;
+  const tableBody = document.getElementById('reportBody');
+  tableBody.innerHTML = '<tr><td colspan="8" class="text-center">데이터를 불러오는 중...</td></tr>';
+
+  try {
+    const initialData = await getInitialData();
+    initializeReportTable(initialData);
+  } catch (error) {
+    alert('데이터를 불러오는 데 실패했습니다: ' + error.message);
+    tableBody.innerHTML = '<tr><td colspan="8" class="text-center error">오류 발생! 데이터를 불러올 수 없습니다.</td></tr>';
+  }
+}
+
+/**
+ * '전체 등록' 버튼 클릭 시 실행되는 이벤트 핸들러.
+ * 폼 데이터를 서버에 전송합니다.
+ */
+async function handleSubmit() {
+  if (!selectedDate) {
+    alert('먼저 달력에서 날짜를 선택해주세요.');
+    return;
+  }
+
+  const reportData = getReportData();
+  if (!reportData) {
+    // getReportData 내부에서 이미 alert으로 사용자에게 알림
+    return;
+  }
+
+  // 각 항목에 선택된 날짜 추가
+  const payload = reportData.map(item => ({ ...item, date: selectedDate }));
+
+  const submitBtn = document.getElementById('submitBtn');
+  submitBtn.disabled = true;
+  submitBtn.textContent = '등록 중...';
+
+  try {
+    const result = await createWorkReport(payload);
+    if (result.success) {
+      alert('✅ 작업 보고서가 성공적으로 등록되었습니다!');
+      // 성공 후 폼을 다시 로드하거나, 다른 페이지로 이동 등의 로직 추가 가능
+      onDateSelect(selectedDate); // 현재 날짜의 폼을 다시 로드
+    } else {
+      throw new Error(result.error || '알 수 없는 오류로 등록에 실패했습니다.');
+    }
+  } catch (error) {
+    alert('❌ 등록 실패: ' + error.message);
+  } finally {
+    submitBtn.disabled = false;
+    submitBtn.textContent = '전체 등록';
+  }
+}
+
+/**
+ * 페이지 초기화 함수
+ */
+function initializePage() {
+  renderCalendar('calendar', onDateSelect);
+  
+  const submitBtn = document.getElementById('submitBtn');
+  submitBtn.addEventListener('click', handleSubmit);
+}
+
+// DOM이 로드되면 페이지 초기화를 시작합니다.
+document.addEventListener('DOMContentLoaded', initializePage);
\ No newline at end of file
diff --git a/system1-factory/web/js/_deprecated/work-report-ui.js b/system1-factory/web/js/_deprecated/work-report-ui.js
new file mode 100644
index 0000000..e4eba20
--- /dev/null
+++ b/system1-factory/web/js/_deprecated/work-report-ui.js
@@ -0,0 +1,141 @@
+// /js/work-report-ui.js
+
+const DEFAULT_PROJECT_ID = '13'; // 나중에는 API나 설정에서 받아오는 것이 좋음
+const DEFAULT_TASK_ID = '15';
+
+/**
+ * 주어진 데이터를 바탕으로 <select> 요소의 <option>들을 생성합니다.
+ * @param {Array<object>} items - 옵션으로 만들 데이터 배열
+ * @param {string} valueField - <option>의 value 속성에 사용할 필드 이름
+ * @param {string} textField - <option>의 텍스트에 사용할 필드 이름
+ * @returns {string} - 생성된 HTML 옵션 문자열
+ */
+function createOptions(items, valueField, textField) {
+  return items.map(item => `<option value="${item[valueField]}">${textField(item)}</option>`).join('');
+}
+
+/**
+ * 테이블의 모든 행 번호를 다시 매깁니다.
+ * @param {HTMLTableSectionElement} tableBody - tbody 요소
+ */
+function updateRowNumbers(tableBody) {
+  tableBody.querySelectorAll('tr').forEach((tr, index) => {
+    tr.cells[0].textContent = index + 1;
+  });
+}
+
+/**
+ * 하나의 작업 보고서 행(tr)을 생성합니다.
+ * @param {object} worker - 작업자 정보
+ * @param {Array} projects - 전체 프로젝트 목록
+ * @param {Array} tasks - 전체 태스크 목록
+ * @param {number} index - 행 번호
+ * @returns {HTMLTableRowElement} - 생성된 tr 요소
+ */
+function createReportRow(worker, projects, tasks, index) {
+  const tr = document.createElement('tr');
+
+  tr.innerHTML = `
+    <td>${index + 1}</td>
+    <td>
+      <input type="hidden" name="user_id" value="${worker.user_id}">
+      ${worker.worker_name}
+    </td>
+    <td><select name="project_id">${createOptions(projects, 'project_id', p => p.project_name)}</select></td>
+    <td><select name="task_id">${createOptions(tasks, 'task_id', t => `${t.category}:${t.subcategory}`)}</select></td>
+    <td>
+      <select name="overtime">
+        <option value="">없음</option>
+        ${[1, 2, 3, 4].map(n => `<option>${n}</option>`).join('')}
+      </select>
+    </td>
+    <td>
+      <select name="work_type">
+        ${['근무', '연차', '유급', '반차', '반반차', '조퇴', '휴무'].map(t => `<option>${t}</option>`).join('')}
+      </select>
+    </td>
+    <td><input type="text" name="memo" placeholder="메모"></td>
+    <td><button type="button" class="remove-btn">x</button></td>
+  `;
+
+  // 이벤트 리스너 설정
+  const workTypeSelect = tr.querySelector('[name="work_type"]');
+  const projectSelect = tr.querySelector('[name="project_id"]');
+  const taskSelect = tr.querySelector('[name="task_id"]');
+
+  workTypeSelect.addEventListener('change', () => {
+    const isDisabled = ['연차', '휴무', '유급'].includes(workTypeSelect.value);
+    projectSelect.disabled = isDisabled;
+    taskSelect.disabled = isDisabled;
+    if (isDisabled) {
+      projectSelect.value = DEFAULT_PROJECT_ID;
+      taskSelect.value = DEFAULT_TASK_ID;
+    }
+  });
+
+  tr.querySelector('.remove-btn').addEventListener('click', () => {
+    tr.remove();
+    updateRowNumbers(tr.parentElement);
+  });
+
+  return tr;
+}
+
+/**
+ * 작업 보고서 테이블을 초기화하고 데이터를 채웁니다.
+ * @param {{workers: Array, projects: Array, tasks: Array}} initialData - 초기 데이터
+ */
+export function initializeReportTable(initialData) {
+  const tableBody = document.getElementById('reportBody');
+  if (!tableBody) return;
+
+  tableBody.innerHTML = ''; // 기존 내용 초기화
+  const { workers, projects, tasks } = initialData;
+
+  if (!workers || workers.length === 0) {
+    tableBody.innerHTML = '<tr><td colspan="8" class="text-center">등록할 작업자 정보가 없습니다.</td></tr>';
+    return;
+  }
+
+  workers.forEach((worker, index) => {
+    const row = createReportRow(worker, projects, tasks, index);
+    tableBody.appendChild(row);
+  });
+}
+
+/**
+ * 테이블에서 폼 데이터를 추출하여 배열로 반환합니다.
+ * @returns {Array<object>|null} - 추출된 데이터 배열 또는 유효성 검사 실패 시 null
+ */
+export function getReportData() {
+  const tableBody = document.getElementById('reportBody');
+  const rows = tableBody.querySelectorAll('tr');
+  
+  if (rows.length === 0 || (rows.length === 1 && rows[0].cells.length < 2)) {
+    alert('등록할 내용이 없습니다.');
+    return null;
+  }
+  
+  const reportData = [];
+  const workerIds = new Set();
+
+  for (const tr of rows) {
+    const workerId = tr.querySelector('[name="user_id"]').value;
+    if (workerIds.has(workerId)) {
+      alert(`오류: 작업자 '${tr.cells[1].textContent.trim()}'가 중복 등록되었습니다.`);
+      return null;
+    }
+    workerIds.add(workerId);
+    
+    reportData.push({
+      user_id: workerId,
+      project_id: tr.querySelector('[name="project_id"]').value,
+      task_id: tr.querySelector('[name="task_id"]').value,
+      overtime_hours: tr.querySelector('[name="overtime"]').value || 0,
+      work_details: tr.querySelector('[name="work_type"]').value,
+      memo: tr.querySelector('[name="memo"]').value
+    });
+  }
+
+  return reportData;
+} 
\ No newline at end of file
diff --git a/system1-factory/web/js/admin-settings.js b/system1-factory/web/js/admin-settings.js
index 8b8b820..e802cc6 100644
--- a/system1-factory/web/js/admin-settings.js
+++ b/system1-factory/web/js/admin-settings.js
@@ -794,14 +794,14 @@ document.addEventListener('DOMContentLoaded', () => {
 
 // ========== 작업자 연결 기능 ========== //
 let departments = [];
-let selectedWorkerId = null;
+let selectedUserId = null;
 
 // 연결된 작업자 정보 표시 업데이트
 function updateLinkedWorkerDisplay(user) {
   const linkedWorkerInfo = document.getElementById('linkedWorkerInfo');
   if (!linkedWorkerInfo) return;
 
-  if (user.worker_id && user.worker_name) {
+  if (user.user_id && user.worker_name) {
     linkedWorkerInfo.innerHTML = `
       <span class="worker-badge">
         <span class="worker-name">👤 ${user.worker_name}</span>
@@ -820,7 +820,7 @@ async function openWorkerSelectModal() {
     return;
   }
 
-  selectedWorkerId = currentEditingUser.worker_id || null;
+  selectedUserId = currentEditingUser.user_id || null;
 
   // 부서 목록 로드
   await loadDepartmentsForSelect();
@@ -833,7 +833,7 @@ window.openWorkerSelectModal = openWorkerSelectModal;
 // 작업자 선택 모달 닫기
 function closeWorkerSelectModal() {
   document.getElementById('workerSelectModal').style.display = 'none';
-  selectedWorkerId = null;
+  selectedUserId = null;
 }
 window.closeWorkerSelectModal = closeWorkerSelectModal;
 
@@ -906,18 +906,18 @@ function renderWorkerListForSelect(workers) {
   }
 
   // 이미 다른 계정에 연결된 작업자 확인을 위해 users 배열 사용
-  const linkedWorkerIds = users
-    .filter(u => u.worker_id && u.user_id !== currentEditingUser?.user_id)
-    .map(u => u.worker_id);
+  const linkedUserIds = users
+    .filter(u => u.user_id && u.user_id !== currentEditingUser?.user_id)
+    .map(u => u.user_id);
 
   container.innerHTML = workers.map(worker => {
-    const isSelected = selectedWorkerId === worker.worker_id;
-    const isLinkedToOther = linkedWorkerIds.includes(worker.worker_id);
-    const linkedUser = isLinkedToOther ? users.find(u => u.worker_id === worker.worker_id) : null;
+    const isSelected = selectedUserId === worker.user_id;
+    const isLinkedToOther = linkedUserIds.includes(worker.user_id);
+    const linkedUser = isLinkedToOther ? users.find(u => u.user_id === worker.user_id) : null;
 
     return `
       <div class="worker-select-item ${isSelected ? 'selected' : ''} ${isLinkedToOther ? 'disabled' : ''}"
-           onclick="${isLinkedToOther ? '' : `selectWorker(${worker.worker_id}, '${worker.worker_name}')`}">
+           onclick="${isLinkedToOther ? '' : `selectWorker(${worker.user_id}, '${worker.worker_name}')`}">
         <div class="worker-avatar">${worker.worker_name.charAt(0)}</div>
         <div class="worker-info">
           <div class="worker-name">${worker.worker_name}</div>
@@ -941,8 +941,8 @@ function getJobTypeName(jobType) {
 }
 
 // 작업자 선택
-async function selectWorker(workerId, workerName) {
-  selectedWorkerId = workerId;
+async function selectWorker(userId, workerName) {
+  selectedUserId = userId;
 
   // UI 업데이트
   document.querySelectorAll('.worker-select-item').forEach(item => {
@@ -950,7 +950,7 @@ async function selectWorker(workerId, workerName) {
     item.querySelector('.select-indicator').textContent = '';
   });
 
-  const selectedItem = document.querySelector(`.worker-select-item[onclick*="${workerId}"]`);
+  const selectedItem = document.querySelector(`.worker-select-item[onclick*="${userId}"]`);
   if (selectedItem) {
     selectedItem.classList.add('selected');
     selectedItem.querySelector('.select-indicator').textContent = '✓';
@@ -959,12 +959,12 @@ async function selectWorker(workerId, workerName) {
   // 서버에 저장
   try {
     const response = await window.apiCall(`/users/${currentEditingUser.user_id}`, 'PUT', {
-      worker_id: workerId
+      user_id: userId
     });
 
     if (response.success) {
       // currentEditingUser 업데이트
-      currentEditingUser.worker_id = workerId;
+      currentEditingUser.user_id = userId;
       currentEditingUser.worker_name = workerName;
 
       // 부서 정보도 업데이트
@@ -1003,7 +1003,7 @@ async function unlinkWorker() {
     return;
   }
 
-  if (!currentEditingUser.worker_id) {
+  if (!currentEditingUser.user_id) {
     showToast('연결된 작업자가 없습니다.', 'warning');
     closeWorkerSelectModal();
     return;
@@ -1015,19 +1015,19 @@ async function unlinkWorker() {
 
   try {
     const response = await window.apiCall(`/users/${currentEditingUser.user_id}`, 'PUT', {
-      worker_id: null
+      user_id: null
     });
 
     if (response.success) {
       // currentEditingUser 업데이트
-      currentEditingUser.worker_id = null;
+      currentEditingUser.user_id = null;
       currentEditingUser.worker_name = null;
       currentEditingUser.department_name = null;
 
       // users 배열 업데이트
       const userIndex = users.findIndex(u => u.user_id === currentEditingUser.user_id);
       if (userIndex !== -1) {
-        users[userIndex] = { ...users[userIndex], worker_id: null, worker_name: null, department_name: null };
+        users[userIndex] = { ...users[userIndex], user_id: null, worker_name: null, department_name: null };
       }
 
       // 표시 업데이트
diff --git a/system1-factory/web/js/attendance-validation.js b/system1-factory/web/js/attendance-validation.js
index a2f47e7..b9f5244 100644
--- a/system1-factory/web/js/attendance-validation.js
+++ b/system1-factory/web/js/attendance-validation.js
@@ -322,7 +322,7 @@ async function fetchDailyWorkReports(date) {
 async function updateWorkerHours(workerId, date, newHours, reason = '') {
     try {
         const data = {
-            worker_id: workerId,
+            user_id: workerId,
             report_date: date,
             work_hours: parseFloat(newHours),
             modification_reason: reason,
@@ -412,7 +412,7 @@ async function calculateDateStatus(dateStr) {
             status = 'missing';
         } else {
             const hasDiscrepancy = workReports.some(wr => {
-                const dr = dailyReports.find(d => d.worker_id === wr.worker_id);
+                const dr = dailyReports.find(d => d.user_id === wr.user_id);
                 if (!dr) return true;
                 
                 const expected = calculateExpectedHours(wr.status, wr.overtime_hours);
@@ -607,8 +607,8 @@ async function getWorkersForDate(dateStr) {
         
         // WorkReports 데이터 추가
         workReports.forEach(wr => {
-            workerMap.set(wr.worker_id, {
-                worker_id: wr.worker_id,
+            workerMap.set(wr.user_id, {
+                user_id: wr.user_id,
                 worker_name: wr.worker_name,
                 overtime_hours: wr.overtime_hours || 0,
                 status: wr.status || 'normal',
@@ -621,13 +621,13 @@ async function getWorkersForDate(dateStr) {
         
         // DailyReports 데이터 추가
         dailyReports.forEach(dr => {
-            if (workerMap.has(dr.worker_id)) {
-                const worker = workerMap.get(dr.worker_id);
+            if (workerMap.has(dr.user_id)) {
+                const worker = workerMap.get(dr.user_id);
                 worker.reported_hours = dr.work_hours;
                 worker.hasDailyReport = true;
             } else {
-                workerMap.set(dr.worker_id, {
-                    worker_id: dr.worker_id,
+                workerMap.set(dr.user_id, {
+                    user_id: dr.user_id,
                     worker_name: dr.worker_name,
                     overtime_hours: 0,
                     status: 'normal',
@@ -739,7 +739,7 @@ async function saveEditedWork() {
         
         showMessage('수정 중...', 'loading');
         
-        await updateWorkerHours(editingWorker.worker_id, selectedDate, newHours, reason);
+        await updateWorkerHours(editingWorker.user_id, selectedDate, newHours, reason);
         
         showMessage('✅ 근무시간이 성공적으로 수정되었습니다!', 'success');
         closeEditModal();
@@ -767,7 +767,7 @@ async function deleteWorker(worker) {
     try {
         showMessage('삭제 중...', 'loading');
         
-        await deleteWorkerReport(worker.worker_id, selectedDate);
+        await deleteWorkerReport(worker.user_id, selectedDate);
         
         showMessage('✅ 작업 데이터가 성공적으로 삭제되었습니다!', 'success');
         
@@ -884,7 +884,7 @@ function renderWorkersList(workers) {
                                 </div>
                                 <div>
                                     <div class="worker-name">${worker.worker_name}</div>
-                                    <div class="worker-id">작업자 ID: ${worker.worker_id}</div>
+                                    <div class="worker-id">작업자 ID: ${worker.user_id}</div>
                                 </div>
                             </div>
                             <div class="status-badge">${getStatusIcon(worker.validationStatus)}</div>
diff --git a/system1-factory/web/js/attendance.js b/system1-factory/web/js/attendance.js
index 10ffcc7..99f9941 100644
--- a/system1-factory/web/js/attendance.js
+++ b/system1-factory/web/js/attendance.js
@@ -45,7 +45,7 @@ async function fetchWorkers() {
       return worker.status === 'active' || worker.is_active === 1 || worker.is_active === true;
     });
 
-    workers.sort((a, b) => a.worker_id - b.worker_id);
+    workers.sort((a, b) => a.user_id - b.user_id);
   } catch (err) {
     alert('작업자 불러오기 실패');
   }
@@ -93,14 +93,14 @@ function renderTable(data, year, month, lastDay) {
   workers.forEach(w => {
     // ✅ 월간 데이터 (표에 표시용)
     const recsThisMonth = data.filter(r =>
-      r.worker_id === w.worker_id &&
+      r.user_id === w.user_id &&
       new Date(r.date).getFullYear() === +year &&
       new Date(r.date).getMonth() + 1 === +month
     );
 
     // ✅ 연간 데이터 (연차 계산용)
     const recsThisYear = data.filter(r =>
-      r.worker_id === w.worker_id &&
+      r.user_id === w.user_id &&
       new Date(r.date).getFullYear() === +year
     );
 
diff --git a/system1-factory/web/js/daily-issue-api.js b/system1-factory/web/js/daily-issue-api.js
index 8a0e95b..ca8dc2d 100644
--- a/system1-factory/web/js/daily-issue-api.js
+++ b/system1-factory/web/js/daily-issue-api.js
@@ -34,8 +34,8 @@ export async function getWorkersByDate(date) {
     if (reports && reports.length > 0) {
       const workerMap = new Map();
       reports.forEach(r => {
-        if (!workerMap.has(r.worker_id)) {
-          workerMap.set(r.worker_id, { worker_id: r.worker_id, worker_name: r.worker_name });
+        if (!workerMap.has(r.user_id)) {
+          workerMap.set(r.user_id, { user_id: r.user_id, worker_name: r.worker_name });
         }
       });
       workers = Array.from(workerMap.values());
diff --git a/system1-factory/web/js/daily-issue-ui.js b/system1-factory/web/js/daily-issue-ui.js
index c125ea8..fdc3082 100644
--- a/system1-factory/web/js/daily-issue-ui.js
+++ b/system1-factory/web/js/daily-issue-ui.js
@@ -54,7 +54,7 @@ export function renderWorkerList(workers) {
     btn.type = 'button';
     btn.className = 'btn';
     btn.textContent = worker.worker_name;
-    btn.dataset.id = worker.worker_id;
+    btn.dataset.id = worker.user_id;
     btn.addEventListener('click', () => btn.classList.toggle('selected'));
     DOM.workerList.appendChild(btn);
   });
@@ -79,7 +79,7 @@ export function getFormData() {
     issue_type_id: DOM.issueTypeSelect.value,
     start_time: DOM.timeStart.value,
     end_time: DOM.timeEnd.value,
-    worker_ids: selectedWorkers, // worker_id -> worker_ids 로 명확하게 변경
+    user_ids: selectedWorkers, // user_id -> user_ids 로 명확하게 변경
   };
 
   for (const key in data) {
diff --git a/system1-factory/web/js/daily-work-report-mobile.js b/system1-factory/web/js/daily-work-report-mobile.js
index e167209..07a2e1b 100644
--- a/system1-factory/web/js/daily-work-report-mobile.js
+++ b/system1-factory/web/js/daily-work-report-mobile.js
@@ -792,7 +792,7 @@ const MobileReport = (function() {
     const reportData = {
       tbm_assignment_id: tbm.assignment_id,
       tbm_session_id: tbm.session_id,
-      worker_id: tbm.worker_id,
+      user_id: tbm.user_id,
       project_id: tbm.project_id,
       work_type_id: tbm.task_id,
       report_date: reportDate,
@@ -895,7 +895,7 @@ const MobileReport = (function() {
         data: {
           tbm_assignment_id: tbm.assignment_id,
           tbm_session_id: tbm.session_id,
-          worker_id: tbm.worker_id,
+          user_id: tbm.user_id,
           project_id: tbm.project_id,
           work_type_id: tbm.task_id,
           report_date: reportDate,
@@ -974,7 +974,7 @@ const MobileReport = (function() {
     const state = window.DailyWorkReportState;
 
     manualCards[id] = {
-      worker_id: null,
+      user_id: null,
       report_date: getKoreaToday(),
       project_id: null,
       work_type_id: null,
@@ -1006,9 +1006,9 @@ const MobileReport = (function() {
       <button class="m-manual-delete" onclick="MobileReport.removeManualCard('${id}')">&times;</button>
       <div class="m-form-group">
         <label class="m-form-label">작업자</label>
-        <select class="m-form-select" id="m_manual_worker_${id}" onchange="MobileReport.updateManualField('${id}','worker_id',this.value)">
+        <select class="m-form-select" id="m_manual_worker_${id}" onchange="MobileReport.updateManualField('${id}','user_id',this.value)">
           <option value="">작업자 선택</option>
-          ${workers.map(w => `<option value="${w.worker_id}">${esc(w.worker_name)} (${esc(w.job_type || '-')})</option>`).join('')}
+          ${workers.map(w => `<option value="${w.user_id}">${esc(w.worker_name)} (${esc(w.job_type || '-')})</option>`).join('')}
         </select>
       </div>
       <div class="m-form-row">
@@ -1127,7 +1127,7 @@ const MobileReport = (function() {
     const mc = manualCards[id];
     if (!mc) return;
 
-    const workerId = mc.worker_id || document.getElementById('m_manual_worker_' + id)?.value;
+    const workerId = mc.user_id || document.getElementById('m_manual_worker_' + id)?.value;
     const reportDate = mc.report_date || document.getElementById('m_manual_date_' + id)?.value;
     const projectId = mc.project_id || document.getElementById('m_manual_project_' + id)?.value;
     const taskId = mc.task_id || document.getElementById('m_manual_task_' + id)?.value;
@@ -1148,7 +1148,7 @@ const MobileReport = (function() {
 
     const reportData = {
       report_date: reportDate,
-      worker_id: parseInt(workerId),
+      user_id: parseInt(workerId),
       work_entries: [{
         project_id: parseInt(projectId),
         task_id: parseInt(taskId),
diff --git a/system1-factory/web/js/daily-work-report.js b/system1-factory/web/js/daily-work-report.js
index 8bd66ec..ee9e514 100644
--- a/system1-factory/web/js/daily-work-report.js
+++ b/system1-factory/web/js/daily-work-report.js
@@ -581,7 +581,7 @@ window.submitTbmWorkReport = async function(index) {
   const reportData = {
     tbm_assignment_id: tbm.assignment_id,
     tbm_session_id: tbm.session_id,
-    worker_id: tbm.worker_id,
+    user_id: tbm.user_id,
     project_id: tbm.project_id,
     work_type_id: tbm.task_id, // task_id를 work_type_id 컬럼에 저장 (직접 작업보고서와 일관성 유지)
     report_date: reportDate,
@@ -729,7 +729,7 @@ window.batchSubmitTbmSession = async function(sessionKey) {
       data: {
         tbm_assignment_id: tbm.assignment_id,
         tbm_session_id: tbm.session_id,
-        worker_id: tbm.worker_id,
+        user_id: tbm.user_id,
         project_id: tbm.project_id,
         work_type_id: tbm.task_id, // task_id를 work_type_id 컬럼에 저장 (일관성 유지)
         report_date: reportDate,
@@ -847,7 +847,7 @@ window.addManualWorkRow = function() {
     <td>
       <select class="form-input-compact" id="worker_${manualIndex}" style="width: 120px;" required>
         <option value="">작업자 선택</option>
-        ${workers.map(w => `<option value="${escapeHtml(String(w.worker_id))}">${escapeHtml(w.worker_name)} (${escapeHtml(w.job_type || '-')})</option>`).join('')}
+        ${workers.map(w => `<option value="${escapeHtml(String(w.user_id))}">${escapeHtml(w.worker_name)} (${escapeHtml(w.job_type || '-')})</option>`).join('')}
       </select>
     </td>
     <td>
@@ -1418,7 +1418,7 @@ window.submitManualWorkReport = async function(manualIndex) {
   // 주의: 서비스에서 task_id를 work_type_id 컬럼에 매핑함
   const reportData = {
     report_date: reportDate,
-    worker_id: parseInt(workerId),
+    user_id: parseInt(workerId),
     work_entries: [{
       project_id: parseInt(projectId),
       task_id: parseInt(taskId),  // 서비스에서 work_type_id로 매핑됨
@@ -1577,7 +1577,7 @@ window.submitAllManualWorkReports = async function() {
       // 서비스 레이어가 기대하는 형식으로 변환
       const reportData = {
         report_date: reportDate,
-        worker_id: parseInt(workerId),
+        user_id: parseInt(workerId),
         work_entries: [{
           project_id: parseInt(projectId),
           task_id: parseInt(taskId),
@@ -2282,7 +2282,7 @@ async function loadTbmTeamForDate(date) {
         // 팀 구성 조회
         const teamRes = await window.apiCall(`/tbm/sessions/${targetSession.session_id}/team`);
         if (teamRes && teamRes.success && teamRes.data) {
-          const teamWorkerIds = teamRes.data.map(m => m.worker_id);
+          const teamWorkerIds = teamRes.data.map(m => m.user_id);
           console.log(`✅ TBM 팀 구성 로드 성공: ${teamWorkerIds.length}명`);
           return teamWorkerIds;
         }
@@ -2334,16 +2334,16 @@ async function populateWorkerGrid() {
     btn.type = 'button';
     btn.className = 'worker-card';
     btn.textContent = worker.worker_name;
-    btn.dataset.id = worker.worker_id;
+    btn.dataset.id = worker.user_id;
 
     // TBM 팀 구성에 포함된 작업자는 자동 선택
-    if (tbmWorkerIds.includes(worker.worker_id)) {
+    if (tbmWorkerIds.includes(worker.user_id)) {
       btn.classList.add('selected');
-      selectedWorkers.add(worker.worker_id);
+      selectedWorkers.add(worker.user_id);
     }
 
     btn.addEventListener('click', () => {
-      toggleWorkerSelection(worker.worker_id, btn);
+      toggleWorkerSelection(worker.user_id, btn);
     });
 
     grid.appendChild(btn);
@@ -2673,12 +2673,12 @@ async function saveWorkReport() {
     const failureDetails = [];
 
     for (const workerId of selectedWorkers) {
-      const workerName = workers.find(w => w.worker_id == workerId)?.worker_name || '알 수 없음';
+      const workerName = workers.find(w => w.user_id == workerId)?.worker_name || '알 수 없음';
 
       // 서버가 기대하는 work_entries 배열 형태로 전송
       const requestData = {
         report_date: reportDate,
-        worker_id: parseInt(workerId),
+        user_id: parseInt(workerId),
         work_entries: newWorkEntries.map(entry => ({
           project_id: entry.project_id,
           task_id: entry.work_type_id, // 서버에서 task_id로 기대
diff --git a/system1-factory/web/js/daily-work-report/state.js b/system1-factory/web/js/daily-work-report/state.js
index 2df535c..889fe94 100644
--- a/system1-factory/web/js/daily-work-report/state.js
+++ b/system1-factory/web/js/daily-work-report/state.js
@@ -96,7 +96,7 @@ class DailyWorkReportState extends BaseState {
    */
   selectAllWorkers(select = true) {
     if (select) {
-      this.workers.forEach(w => this.selectedWorkers.add(w.worker_id));
+      this.workers.forEach(w => this.selectedWorkers.add(w.user_id));
     } else {
       this.selectedWorkers.clear();
     }
diff --git a/system1-factory/web/js/department-management.js b/system1-factory/web/js/department-management.js
index e159574..33b645a 100644
--- a/system1-factory/web/js/department-management.js
+++ b/system1-factory/web/js/department-management.js
@@ -110,11 +110,11 @@ function renderWorkerList(workers) {
   }
 
   container.innerHTML = workers.map(worker => `
-    <div class="worker-card ${selectedWorkers.has(worker.worker_id) ? 'selected' : ''}"
-         onclick="toggleWorkerSelection(${worker.worker_id})">
+    <div class="worker-card ${selectedWorkers.has(worker.user_id) ? 'selected' : ''}"
+         onclick="toggleWorkerSelection(${worker.user_id})">
       <div class="worker-info-row">
-        <input type="checkbox" ${selectedWorkers.has(worker.worker_id) ? 'checked' : ''}
-               onclick="event.stopPropagation(); toggleWorkerSelection(${worker.worker_id})">
+        <input type="checkbox" ${selectedWorkers.has(worker.user_id) ? 'checked' : ''}
+               onclick="event.stopPropagation(); toggleWorkerSelection(${worker.user_id})">
         <div class="worker-avatar">${worker.worker_name.charAt(0)}</div>
         <div class="worker-details">
           <span class="worker-name">${worker.worker_name}</span>
diff --git a/system1-factory/web/js/load-sections.js b/system1-factory/web/js/load-sections.js
index 6b735ff..da3fd38 100644
--- a/system1-factory/web/js/load-sections.js
+++ b/system1-factory/web/js/load-sections.js
@@ -23,7 +23,7 @@ async function fetchDashboardStats() {
     // 필요한 데이터 형태로 가공 (예시)
     return {
       today_reports_count: stats.length,
-      today_workers_count: new Set(stats.map(d => d.worker_id)).size,
+      today_workers_count: new Set(stats.map(d => d.user_id)).size,
     };
   } catch (error) {
     console.error('대시보드 통계 데이터 로드 실패:', error);
diff --git a/system1-factory/web/js/manage-user.js b/system1-factory/web/js/manage-user.js
index 253195e..bd8c97a 100644
--- a/system1-factory/web/js/manage-user.js
+++ b/system1-factory/web/js/manage-user.js
@@ -147,7 +147,7 @@ userForm?.addEventListener('submit', async e => {
     password: document.getElementById('password').value.trim(),
     name: document.getElementById('name').value.trim(),
     access_level: document.getElementById('access_level').value,
-    worker_id: document.getElementById('worker_id').value || null
+    user_id: document.getElementById('user_id').value || null
   };
 
   try {
@@ -206,13 +206,13 @@ async function loadUsers() {
       
       list.forEach(item => {
         item.access_level = accessLabels[item.access_level] || item.access_level;
-        item.worker_id = item.worker_id || '-';
+        item.user_id = item.user_id || '-';
 
         // 행 생성
         const tr = document.createElement('tr');
 
         // 데이터 컬럼
-        ['user_id', 'username', 'name', 'access_level', 'worker_id'].forEach(key => {
+        ['user_id', 'username', 'name', 'access_level', 'user_id'].forEach(key => {
           const td = document.createElement('td');
           td.textContent = item[key] || '-';
           tr.appendChild(td);
@@ -267,7 +267,7 @@ async function loadUsers() {
 }
 
 async function loadWorkerOptions() {
-  const select = document.getElementById('worker_id');
+  const select = document.getElementById('user_id');
   if (!select) return;
 
   try {
@@ -289,8 +289,8 @@ async function loadWorkerOptions() {
     if (Array.isArray(workers)) {
       workers.forEach(w => {
         const opt = document.createElement('option');
-        opt.value = w.worker_id;
-        opt.textContent = `${w.worker_name} (${w.worker_id})`;
+        opt.value = w.user_id;
+        opt.textContent = `${w.worker_name} (${w.user_id})`;
         select.appendChild(opt);
       });
     }
diff --git a/system1-factory/web/js/manage-worker.js b/system1-factory/web/js/manage-worker.js
index bb44577..269877f 100644
--- a/system1-factory/web/js/manage-worker.js
+++ b/system1-factory/web/js/manage-worker.js
@@ -80,10 +80,10 @@ async function loadWorkers() {
     
     if (Array.isArray(list)) {
       list.forEach(item => {
-        const row = createRow(item, ['worker_id', 'worker_name', 'position'], async w => {
+        const row = createRow(item, ['user_id', 'worker_name', 'position'], async w => {
           if (!confirm('삭제하시겠습니까?')) return;
           try {
-            const delRes = await fetch(`${API}/workers/${w.worker_id}`, {
+            const delRes = await fetch(`${API}/workers/${w.user_id}`, {
               method: 'DELETE',
               headers: getAuthHeaders()
             });
diff --git a/system1-factory/web/js/management-dashboard.js b/system1-factory/web/js/management-dashboard.js
index 36342ed..cfd6eca 100644
--- a/system1-factory/web/js/management-dashboard.js
+++ b/system1-factory/web/js/management-dashboard.js
@@ -255,11 +255,11 @@ function analyzeDashboardData() {
   // 작업자별 데이터 그룹화
   const workerWorkData = {};
   workData.forEach(work => {
-    const workerId = work.worker_id;
-    if (!workerWorkData[workerId]) {
-      workerWorkData[workerId] = [];
+    const userId = work.user_id;
+    if (!workerWorkData[userId]) {
+      workerWorkData[userId] = [];
     }
-    workerWorkData[workerId].push(work);
+    workerWorkData[userId].push(work);
   });
   
   // 전체 통계 계산
@@ -272,7 +272,7 @@ function analyzeDashboardData() {
   
   // 작업자별 상세 분석 (개선된 버전)
   const workerAnalysis = workers.map(worker => {
-    const workerWorks = workerWorkData[worker.worker_id] || [];
+    const workerWorks = workerWorkData[worker.user_id] || [];
     const workerHours = workerWorks.reduce((sum, work) => sum + parseFloat(work.work_hours || 0), 0);
     
     // 작업 유형 분석 (실제 이름으로)
@@ -455,7 +455,7 @@ function createWorkerRow(worker) {
       <div class="update-time ${updateClass}">${updateTimeText}</div>
     </td>
     <td>
-      <button class="detail-btn" onclick="showWorkerDetailSafe('${worker.worker_id}')">
+      <button class="detail-btn" onclick="showWorkerDetailSafe('${worker.user_id}')">
         📋 상세
       </button>
     </td>
@@ -479,7 +479,7 @@ function formatDateTime(date) {
 // 작업자 상세 모달 표시 (안전한 버전)
 function showWorkerDetailSafe(workerId) {
   // 현재 분석된 데이터에서 해당 작업자 찾기
-  const worker = filteredWorkData.find(w => w.worker_id == workerId);
+  const worker = filteredWorkData.find(w => w.user_id == workerId);
   if (!worker) {
     showMessage('작업자 정보를 찾을 수 없습니다.', 'error');
     return;
diff --git a/system1-factory/web/js/modern-dashboard.js b/system1-factory/web/js/modern-dashboard.js
index ea5be23..51f675e 100644
--- a/system1-factory/web/js/modern-dashboard.js
+++ b/system1-factory/web/js/modern-dashboard.js
@@ -246,7 +246,7 @@ async function loadWorkData(date) {
 // ========== 요약 카드 업데이트 ========== //
 function updateSummaryCards() {
   // 오늘 작업자 수
-  const todayWorkersCount = new Set(workData.map(w => w.worker_id)).size;
+  const todayWorkersCount = new Set(workData.map(w => w.user_id)).size;
   updateSummaryCard(elements.todayWorkers, todayWorkersCount, '명');
   
   // 총 작업 시간
@@ -326,7 +326,7 @@ function displayWorkStatus() {
 
   // 작업자별 상황 분석
   const workerStatusList = allWorkers.map(worker => {
-    const todayWork = workData.filter(w => w.worker_id === worker.worker_id);
+    const todayWork = workData.filter(w => w.user_id === worker.user_id);
     const totalHours = todayWork.reduce((sum, w) => sum + parseFloat(w.work_hours || 0), 0);
 
     // 휴가/연차 제외한 실제 작업시간 계산
@@ -453,7 +453,7 @@ function displayWorkStatus() {
     else if (worker.status === 'partial') iconKey = 'partial';
 
     return `
-      <tr data-worker-id="${worker.worker_id}">
+      <tr data-user-id="${worker.user_id}">
         <td data-label="작업자" class="worker-info">
           <div class="worker-avatar">
             <span>${worker.worker_name.charAt(0)}</span>
@@ -492,7 +492,7 @@ function displayWorkStatus() {
 
         <td data-label="액션" class="worker-actions">
           <div class="action-buttons">
-            <button class="action-btn btn-edit" onclick="openWorkerModal(${worker.worker_id}, '${worker.worker_name}')" title="작업입력">
+            <button class="action-btn btn-edit" onclick="openWorkerModal(${worker.user_id}, '${worker.worker_name}')" title="작업입력">
               <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                 <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"></path>
                 <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"></path>
@@ -500,7 +500,7 @@ function displayWorkStatus() {
               <span class="action-text">작업입력</span>
             </button>
             ${worker.vacationType ? `
-              <button class="action-btn btn-vacation" onclick="handleVacation(${worker.worker_id}, '${worker.vacationType}')" title="${worker.vacationType === 'full' ? '연차처리' : worker.vacationType === 'half' ? '반차처리' : '반반차처리'}">
+              <button class="action-btn btn-vacation" onclick="handleVacation(${worker.user_id}, '${worker.vacationType}')" title="${worker.vacationType === 'full' ? '연차처리' : worker.vacationType === 'half' ? '반차처리' : '반반차처리'}">
                 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                   <rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect>
                   <line x1="16" y1="2" x2="16" y2="6"></line>
@@ -511,7 +511,7 @@ function displayWorkStatus() {
               </button>
             ` : ''}
             ${worker.status === 'overtime-warning' ? `
-              <button class="action-btn btn-confirm" onclick="confirmOvertime(${worker.worker_id})" title="정상확인">
+              <button class="action-btn btn-confirm" onclick="confirmOvertime(${worker.user_id})" title="정상확인">
                 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                   <polyline points="20 6 9 17 4 12"></polyline>
                 </svg>
@@ -563,16 +563,16 @@ function displayWorkersAsCards(workers) {
   elements.workersContainer.innerHTML = `
     <div class="workers-grid grid grid-cols-4">
       ${workers.map(worker => {
-        const todayWork = workData.filter(w => w.worker_id === worker.worker_id);
+        const todayWork = workData.filter(w => w.user_id === worker.user_id);
         const totalHours = todayWork.reduce((sum, w) => sum + parseFloat(w.work_hours || 0), 0);
-        
+
         // 휴가/연차 제외한 실제 작업시간 계산
         const actualWorkHours = todayWork
           .filter(w => w.project_id !== 13) // 연차/휴무 프로젝트 제외
           .reduce((sum, w) => sum + parseFloat(w.work_hours || 0), 0);
-        
+
         const hasError = todayWork.some(w => w.work_status_id === 2);
-        
+
         // 정규 작업과 에러 작업 건수 분리
         const regularWorkCount = todayWork.filter(w => w.project_id !== 13 && w.work_status_id !== 2).length;
         const errorWorkCount = todayWork.filter(w => w.project_id !== 13 && w.work_status_id === 2).length;
@@ -631,7 +631,7 @@ function displayWorkersAsList(workers) {
         </thead>
         <tbody>
           ${workers.map(worker => {
-            const todayWork = workData.filter(w => w.worker_id === worker.worker_id);
+            const todayWork = workData.filter(w => w.user_id === worker.user_id);
             const totalHours = todayWork.reduce((sum, w) => sum + parseFloat(w.work_hours || 0), 0);
             const hasError = todayWork.some(w => w.work_status_id === 2);
             
@@ -852,7 +852,7 @@ async function processVacation(workerId, vacationType, hours) {
     // 휴가용 작업 보고서 생성 (특별한 작업 유형으로)
     const vacationReport = {
       report_date: selectedDate,
-      worker_id: workerId,
+      user_id: workerId,
       project_id: 1, // 기본 프로젝트 (휴가용)
       work_type_id: 999, // 휴가 전용 작업 유형 (DB에 추가 필요)
       work_status_id: 1, // 정상 상태
@@ -887,10 +887,10 @@ async function processOvertimeConfirmation(workerId) {
     
     // 새로운 근태 관리 API 사용
     const overtimeData = {
-      worker_id: workerId,
+      user_id: workerId,
       date: selectedDate
     };
-    
+
     const response = await window.apiCall('/attendance/overtime/approve', 'POST', overtimeData);
     
     if (response.success) {
@@ -1104,7 +1104,7 @@ async function loadModalData() {
 
 async function loadModalExistingWork() {
   try {
-    const response = await window.apiCall(`/daily-work-reports?date=${currentModalWorker.date}&worker_id=${currentModalWorker.id}`);
+    const response = await window.apiCall(`/daily-work-reports?date=${currentModalWorker.date}&user_id=${currentModalWorker.id}`);
     modalExistingWork = Array.isArray(response) ? response : (response.data || []);
   } catch (error) {
     console.error('기존 작업 로드 오류:', error);
@@ -1258,7 +1258,7 @@ async function saveModalNewWork() {
     
     const workData = {
       report_date: currentModalWorker.date,
-      worker_id: currentModalWorker.id,
+      user_id: currentModalWorker.id,
       work_entries: [{
         project_id: parseInt(projectId),
         task_id: parseInt(workTypeId), // work_type_id를 task_id로 매핑
@@ -1332,7 +1332,7 @@ async function handleModalVacation(vacationType) {
   try {
     // 새로운 근태 관리 API 사용
     const vacationData = {
-      worker_id: currentModalWorker.id,
+      user_id: currentModalWorker.id,
       date: currentModalWorker.date,
       vacation_type: vacation.code
     };
diff --git a/system1-factory/web/js/my-profile.js b/system1-factory/web/js/my-profile.js
index 201d3c3..3a50a9c 100644
--- a/system1-factory/web/js/my-profile.js
+++ b/system1-factory/web/js/my-profile.js
@@ -71,7 +71,7 @@ function updateProfileUI(user) {
   document.getElementById('username').textContent = user.username || '-';
   document.getElementById('fullName').textContent = user.name || '-';
   document.getElementById('accessLevel').textContent = accessLevelMap[user.access_level] || user.access_level || '-';
-  document.getElementById('workerId').textContent = user.worker_id || '연결되지 않음';
+  document.getElementById('workerId').textContent = user.user_id || '연결되지 않음';
   
   // 날짜 포맷팅
   if (user.created_at) {
diff --git a/system1-factory/web/js/project-analysis-ui.js b/system1-factory/web/js/project-analysis-ui.js
index 75c49e6..5066b6d 100644
--- a/system1-factory/web/js/project-analysis-ui.js
+++ b/system1-factory/web/js/project-analysis-ui.js
@@ -80,7 +80,7 @@ export function updateFilterOptions(masterData) {
     return html;
   };
   DOM.projectFilter.innerHTML = createOptions(masterData.projects, 'project_id', 'project_name');
-  DOM.workerFilter.innerHTML = createOptions(masterData.workers, 'worker_id', 'worker_name');
+  DOM.workerFilter.innerHTML = createOptions(masterData.workers, 'user_id', 'worker_name');
   DOM.taskFilter.innerHTML = createOptions(masterData.tasks, 'task_id', 'category');
 }
 
diff --git a/system1-factory/web/js/system-dashboard.js b/system1-factory/web/js/system-dashboard.js
index bf94526..511adde 100644
--- a/system1-factory/web/js/system-dashboard.js
+++ b/system1-factory/web/js/system-dashboard.js
@@ -678,7 +678,7 @@ function showUserEditForm(user) {
                 </div>
                 <div class="form-group">
                     <label for="edit-worker-id">작업자 ID</label>
-                    <input type="number" id="edit-worker-id" value="${user.worker_id || ''}">
+                    <input type="number" id="edit-worker-id" value="${user.user_id || ''}">
                 </div>
                 <div class="form-actions">
                     <button type="submit" class="btn btn-primary">
@@ -711,9 +711,9 @@ async function updateUser(userId) {
             role: document.getElementById('edit-role').value,
             access_level: document.getElementById('edit-role').value,
             is_active: parseInt(document.getElementById('edit-is-active').value),
-            worker_id: document.getElementById('edit-worker-id').value || null
+            user_id: document.getElementById('edit-worker-id').value || null
         };
-        
+
         const response = await apiRequest(`/api/system/users/${userId}`, 'PUT', formData);
         
         if (response.success) {
@@ -840,7 +840,7 @@ async function createUser() {
             email: document.getElementById('create-email').value || null,
             role: document.getElementById('create-role').value,
             access_level: document.getElementById('create-role').value,
-            worker_id: document.getElementById('create-worker-id').value || null
+            user_id: document.getElementById('create-worker-id').value || null
         };
         
         const response = await apiRequest('/api/system/users', 'POST', formData);
diff --git a/system1-factory/web/js/tbm-create.js b/system1-factory/web/js/tbm-create.js
index ba51d7e..8f5dbaf 100644
--- a/system1-factory/web/js/tbm-create.js
+++ b/system1-factory/web/js/tbm-create.js
@@ -15,8 +15,8 @@
     sessionDate: null,
     leaderId: null,
     leaderName: '',
-    workers: new Set(),          // worker_id Set
-    workerNames: {},             // { worker_id: worker_name }
+    workers: new Set(),          // user_id Set
+    workerNames: {},             // { user_id: worker_name }
     projectId: null,
     projectName: '',
     workTypeId: null,
@@ -41,10 +41,10 @@
       W.sessionDate = window.TbmUtils.getTodayKST();
       var user = window.TbmState.getUser();
       if (user) {
-        if (user.worker_id) {
-          var worker = window.TbmState.allWorkers.find(function(w) { return w.worker_id === user.worker_id; });
+        if (user.user_id) {
+          var worker = window.TbmState.allWorkers.find(function(w) { return w.user_id === user.user_id; });
           if (worker) {
-            W.leaderId = worker.worker_id;
+            W.leaderId = worker.user_id;
             W.leaderName = worker.worker_name;
           } else {
             W.leaderName = user.name || '';
@@ -203,7 +203,7 @@
           W.todayAssignments = {};
           res.data.forEach(function(a) {
             if (a.sessions && a.sessions.length > 0) {
-              W.todayAssignments[a.worker_id] = a;
+              W.todayAssignments[a.user_id] = a;
             }
           });
         } else {
@@ -216,14 +216,14 @@
     }
 
     var workerCards = workers.map(function(w) {
-      var selected = W.workers.has(w.worker_id) ? ' selected' : '';
-      var assignment = W.todayAssignments[w.worker_id];
+      var selected = W.workers.has(w.user_id) ? ' selected' : '';
+      var assignment = W.todayAssignments[w.user_id];
       var assigned = assignment && assignment.total_hours >= 8;
       var partiallyAssigned = assignment && assignment.total_hours > 0 && assignment.total_hours < 8;
 
       var badgeHtml = '';
       var disabledClass = '';
-      var onclick = 'toggleWorker(' + w.worker_id + ')';
+      var onclick = 'toggleWorker(' + w.user_id + ')';
 
       if (assigned) {
         // 종일 배정됨 - 선택 불가
@@ -238,7 +238,7 @@
 
       return '<div class="worker-card' + selected + disabledClass + '"' +
         (onclick ? ' onclick="' + onclick + '"' : '') +
-        ' data-wid="' + w.worker_id + '"' +
+        ' data-wid="' + w.user_id + '"' +
         ' style="' + (assigned ? 'opacity:0.5; pointer-events:none;' : '') + '">' +
         '<div class="worker-check">&#10003;</div>' +
         '<div class="worker-info">' +
@@ -272,7 +272,7 @@
       delete W.workerNames[workerId];
     } else {
       W.workers.add(workerId);
-      var w = window.TbmState.allWorkers.find(function(x) { return x.worker_id === workerId; });
+      var w = window.TbmState.allWorkers.find(function(x) { return x.user_id === workerId; });
       if (w) W.workerNames[workerId] = w.worker_name;
     }
     var card = document.querySelector('[data-wid="' + workerId + '"]');
@@ -284,7 +284,7 @@
   window.toggleAllWorkers = function() {
     var workers = window.TbmState.allWorkers;
     var availableWorkers = workers.filter(function(w) {
-      var a = W.todayAssignments && W.todayAssignments[w.worker_id];
+      var a = W.todayAssignments && W.todayAssignments[w.user_id];
       return !(a && a.total_hours >= 8);
     });
     if (W.workers.size === availableWorkers.length) {
@@ -292,8 +292,8 @@
       W.workerNames = {};
     } else {
       availableWorkers.forEach(function(w) {
-        W.workers.add(w.worker_id);
-        W.workerNames[w.worker_id] = w.worker_name;
+        W.workers.add(w.user_id);
+        W.workerNames[w.user_id] = w.worker_name;
       });
     }
     renderStepWorkers(document.getElementById('stepContainer'));
@@ -522,7 +522,7 @@
       // 1. TBM 세션 생성
       var sessionData = {
         session_date: W.sessionDate,
-        leader_id: leaderId
+        leader_user_id: leaderId
       };
 
       var response = await window.apiCall('/tbm/sessions', 'POST', sessionData);
@@ -536,7 +536,7 @@
       var members = [];
       W.workers.forEach(function(wid) {
         members.push({
-          worker_id: wid,
+          user_id: wid,
           project_id: W.projectId,
           work_type_id: W.workTypeId,
           task_id: null,
diff --git a/system1-factory/web/js/tbm-mobile.js b/system1-factory/web/js/tbm-mobile.js
index 0be6f5e..7b8a7bf 100644
--- a/system1-factory/web/js/tbm-mobile.js
+++ b/system1-factory/web/js/tbm-mobile.js
@@ -124,10 +124,10 @@
 
   function isMySession(s) {
     var userId = currentUser.user_id;
-    var workerId = currentUser.worker_id;
+    var workerId = currentUser.user_id;
     var userName = currentUser.name;
     return (userId && String(s.created_by) === String(userId)) ||
-           (workerId && String(s.leader_id) === String(workerId)) ||
+           (workerId && String(s.leader_user_id) === String(workerId)) ||
            (userName && s.created_by_name === userName);
   }
 
@@ -645,7 +645,7 @@
       var wpId = document.getElementById('de_wp_' + i).value || null;
 
       members.push({
-        worker_id: m.worker_id,
+        user_id: m.user_id,
         project_id: m.project_id || deSession.project_id || null,
         work_type_id: m.work_type_id || deSession.work_type_id || null,
         task_id: taskId ? parseInt(taskId) : null,
@@ -798,7 +798,7 @@
       if (type === 'early' && (!hours || hours <= 0)) {
         window.showToast(esc(completeTeamMembers[i].worker_name) + '의 근무 시간을 입력해주세요.', 'error'); return;
       }
-      attendanceData.push({ worker_id: completeTeamMembers[i].worker_id, attendance_type: type, attendance_hours: hours });
+      attendanceData.push({ user_id: completeTeamMembers[i].user_id, attendance_type: type, attendance_hours: hours });
     }
 
     var btn = document.getElementById('completeSheetBtn');
@@ -996,7 +996,7 @@
 
         // 1) 기존 항목: 시간만 줄이기 (프로젝트/공정 유지)
         await window.TbmAPI.updateTeamMember(deSessionId, {
-          worker_id: m.worker_id,
+          user_id: m.user_id,
           project_id: m.project_id || null,
           work_type_id: m.work_type_id || null,
           task_id: m.task_id || null,
@@ -1009,7 +1009,7 @@
 
         // 2) 나머지 시간으로 새 항목 추가 (프로젝트/공정 변경 가능)
         await window.TbmAPI.splitAssignment(deSessionId, {
-          worker_id: m.worker_id,
+          user_id: m.user_id,
           work_hours: remainHoursKeep,
           project_id: newProjectId,
           work_type_id: newWorkTypeId
@@ -1033,7 +1033,7 @@
         // transfer API 호출
         var res = await window.TbmAPI.transfer({
           transfer_type: 'send',
-          worker_id: m.worker_id,
+          user_id: m.user_id,
           source_session_id: deSessionId,
           dest_session_id: splitTargetSessionId,
           hours: remainHours,
@@ -1094,7 +1094,7 @@
         if (!myDraftSession) {
           btnHtml = '<button type="button" class="pull-btn" disabled title="내 TBM이 없음">내 TBM 없음</button>';
         } else {
-          btnHtml = '<button type="button" class="pull-btn" onclick="event.stopPropagation(); startPull(' + m.worker_id + ', \'' + esc(m.worker_name).replace(/'/g, "\\'") + '\', ' + hours + ')">빼오기</button>';
+          btnHtml = '<button type="button" class="pull-btn" onclick="event.stopPropagation(); startPull(' + m.user_id + ', \'' + esc(m.worker_name).replace(/'/g, "\\'") + '\', ' + hours + ')">빼오기</button>';
         }
 
         html += '<div class="pull-member-item">' +
@@ -1129,7 +1129,7 @@
   };
 
   window.startPull = async function(workerId, workerName, maxHours) {
-    pullWorker = { worker_id: workerId, worker_name: workerName, max_hours: maxHours };
+    pullWorker = { user_id: workerId, worker_name: workerName, max_hours: maxHours };
     document.getElementById('pullHoursTitle').textContent = esc(workerName) + ' 빼오기';
     document.getElementById('pullHoursSubtitle').textContent = '최대 ' + maxHours + 'h 가능';
     document.getElementById('pullHoursInput').value = maxHours;
@@ -1167,7 +1167,7 @@
       var pullWorkTypeId = document.getElementById('pullWorkTypeId').value || null;
       var res = await window.TbmAPI.transfer({
         transfer_type: 'pull',
-        worker_id: pullWorker.worker_id,
+        user_id: pullWorker.user_id,
         source_session_id: pullSessionId,
         dest_session_id: myDraftSession.session_id,
         hours: hours,
@@ -1230,13 +1230,13 @@
       // 현재 세션 리더를 제외한 반장/그룹장 목록
       var leaders = workers.filter(function(w) {
         return (w.job_type === 'leader' || w.job_type === '그룹장' || w.job_type === 'admin') &&
-               w.worker_id !== handoverSession.leader_id;
+               w.user_id !== handoverSession.leader_user_id;
       });
 
       var leaderSelect = document.getElementById('handoverLeaderId');
       leaderSelect.innerHTML = '<option value="">반장 선택...</option>' +
         leaders.map(function(w) {
-          return '<option value="' + w.worker_id + '">' + esc(w.worker_name) + ' (' + (w.job_type || '') + ')</option>';
+          return '<option value="' + w.user_id + '">' + esc(w.worker_name) + ' (' + (w.job_type || '') + ')</option>';
         }).join('');
 
       // 인계할 팀원 체크리스트
@@ -1246,7 +1246,7 @@
       } else {
         listEl.innerHTML = team.map(function(m) {
           return '<label style="display:flex; align-items:center; gap:0.5rem; padding:0.5rem; cursor:pointer;">' +
-            '<input type="checkbox" class="handover-worker-cb" value="' + m.worker_id + '" checked style="width:16px; height:16px;">' +
+            '<input type="checkbox" class="handover-worker-cb" value="' + m.user_id + '" checked style="width:16px; height:16px;">' +
             '<span style="font-weight:500; font-size:0.875rem;">' + esc(m.worker_name) + '</span>' +
             '<span style="font-size:0.75rem; color:#6b7280; margin-left:auto;">' + (m.job_type || '') + '</span>' +
             '</label>';
@@ -1301,13 +1301,13 @@
 
       var handoverData = {
         session_id: handoverSessionId,
-        from_leader_id: handoverSession.leader_id,
-        to_leader_id: toLeaderId,
+        from_leader_user_id: handoverSession.leader_user_id,
+        to_leader_user_id: toLeaderId,
         handover_date: today,
         handover_time: now,
         reason: '모바일 인계',
         handover_notes: notes,
-        worker_ids: workerIds
+        user_ids: workerIds
       };
 
       var res = await window.TbmAPI.saveHandover(handoverData);
diff --git a/system1-factory/web/js/tbm.js b/system1-factory/web/js/tbm.js
index e6399ab..53f1697 100644
--- a/system1-factory/web/js/tbm.js
+++ b/system1-factory/web/js/tbm.js
@@ -394,11 +394,11 @@ function openNewTbmModal() {
   }
 
   // 입력자 자동 설정 (readonly)
-  if (currentUser && currentUser.worker_id) {
-    const worker = allWorkers.find(w => w.worker_id === currentUser.worker_id);
+  if (currentUser && currentUser.user_id) {
+    const worker = allWorkers.find(w => w.user_id === currentUser.user_id);
     if (worker) {
       document.getElementById('leaderName').textContent = worker.worker_name;
-      document.getElementById('leaderId').value = worker.worker_id;
+      document.getElementById('leaderId').value = worker.user_id;
     }
   } else if (currentUser && currentUser.name) {
     document.getElementById('leaderName').textContent = currentUser.name;
@@ -444,7 +444,7 @@ async function renderNewTbmWorkerGrid() {
       todayAssignmentsMap = {};
       assignments.forEach(a => {
         if (a.sessions && a.sessions.length > 0) {
-          todayAssignmentsMap[a.worker_id] = a;
+          todayAssignmentsMap[a.user_id] = a;
         }
       });
     } catch(e) {
@@ -454,8 +454,8 @@ async function renderNewTbmWorkerGrid() {
   }
 
   grid.innerHTML = allWorkers.map(w => {
-    const checked = selectedWorkersForNewTbm.has(w.worker_id) ? 'checked' : '';
-    const assignment = todayAssignmentsMap[w.worker_id];
+    const checked = selectedWorkersForNewTbm.has(w.user_id) ? 'checked' : '';
+    const assignment = todayAssignmentsMap[w.user_id];
     const fullyAssigned = assignment && assignment.total_hours >= 8;
     const partiallyAssigned = assignment && assignment.total_hours > 0 && assignment.total_hours < 8;
 
@@ -474,9 +474,9 @@ async function renderNewTbmWorkerGrid() {
     }
 
     return `
-      <label class="tbm-worker-select-item ${checked ? 'selected' : ''}" data-wid="${w.worker_id}" style="${disabledStyle}">
-        <input type="checkbox" class="new-tbm-worker-cb" data-worker-id="${w.worker_id}" ${checked} ${disabledAttr}
-          onchange="toggleNewTbmWorker(${w.worker_id}, this.checked)">
+      <label class="tbm-worker-select-item ${checked ? 'selected' : ''}" data-wid="${w.user_id}" style="${disabledStyle}">
+        <input type="checkbox" class="new-tbm-worker-cb" data-user-id="${w.user_id}" ${checked} ${disabledAttr}
+          onchange="toggleNewTbmWorker(${w.user_id}, this.checked)">
         <span class="tbm-worker-name">${escapeHtml(w.worker_name)}</span>
         <span class="tbm-worker-role">${escapeHtml(w.job_type || '작업자')}</span>
         ${badgeHtml}
@@ -511,9 +511,9 @@ window.toggleNewTbmWorker = toggleNewTbmWorker;
 
 function selectAllNewTbmWorkers() {
   allWorkers.forEach(w => {
-    const a = todayAssignmentsMap && todayAssignmentsMap[w.worker_id];
+    const a = todayAssignmentsMap && todayAssignmentsMap[w.user_id];
     if (a && a.total_hours >= 8) return; // 종일 배정 제외
-    selectedWorkersForNewTbm.add(w.worker_id);
+    selectedWorkersForNewTbm.add(w.user_id);
   });
   document.querySelectorAll('.new-tbm-worker-cb').forEach(cb => {
     if (!cb.disabled) cb.checked = true;
@@ -539,12 +539,12 @@ function populateLeaderSelect() {
   if (!leaderSelect) return;
 
   // 로그인한 사용자가 작업자와 연결되어 있는지 확인
-  if (currentUser && currentUser.worker_id) {
+  if (currentUser && currentUser.user_id) {
     // 작업자와 연결된 경우: 자동으로 선택하고 비활성화
-    const worker = allWorkers.find(w => w.worker_id === currentUser.worker_id);
+    const worker = allWorkers.find(w => w.user_id === currentUser.user_id);
     if (worker) {
       const jobTypeText = worker.job_type ? ` (${escapeHtml(worker.job_type)})` : '';
-      leaderSelect.innerHTML = `<option value="${escapeHtml(worker.worker_id)}" selected>${escapeHtml(worker.worker_name)}${jobTypeText}</option>`;
+      leaderSelect.innerHTML = `<option value="${escapeHtml(worker.user_id)}" selected>${escapeHtml(worker.worker_name)}${jobTypeText}</option>`;
       leaderSelect.disabled = true;
       console.log('✅ 입력자 자동 설정:', worker.worker_name);
     } else {
@@ -553,7 +553,7 @@ function populateLeaderSelect() {
       leaderSelect.disabled = true;
     }
   } else {
-    // 관리자 계정 (worker_id가 없음): 드롭다운으로 선택 가능
+    // 관리자 계정 (user_id가 없음): 드롭다운으로 선택 가능
     const leaders = allWorkers.filter(w =>
       w.job_type === 'leader' || w.job_type === '그룹장' || w.job_type === 'admin'
     );
@@ -561,7 +561,7 @@ function populateLeaderSelect() {
     leaderSelect.innerHTML = '<option value="">입력자 선택...</option>' +
       leaders.map(w => {
         const jobTypeText = w.job_type ? ` (${escapeHtml(w.job_type)})` : '';
-        return `<option value="${escapeHtml(w.worker_id)}">${escapeHtml(w.worker_name)}${jobTypeText}</option>`;
+        return `<option value="${escapeHtml(w.user_id)}">${escapeHtml(w.worker_name)}${jobTypeText}</option>`;
       }).join('');
     leaderSelect.disabled = false;
     console.log('✅ 관리자: 입력자 선택 가능');
@@ -646,8 +646,8 @@ async function saveTbmSession() {
   let leaderId = parseInt(document.getElementById('leaderId').value);
 
   if (!leaderId || isNaN(leaderId)) {
-    if (!currentUser.worker_id) {
-      console.log('📝 관리자 계정: leader_id를 NULL로 설정');
+    if (!currentUser.user_id) {
+      console.log('📝 관리자 계정: leader_user_id를 NULL로 설정');
       leaderId = null;
     } else {
       console.error('❌ 입력자 설정 오류');
@@ -658,7 +658,7 @@ async function saveTbmSession() {
 
   const sessionData = {
     session_date: document.getElementById('sessionDate').value,
-    leader_id: leaderId
+    leader_user_id: leaderId
   };
 
   if (!sessionData.session_date) {
@@ -680,7 +680,7 @@ async function saveTbmSession() {
     for (const workerData of workerTaskList) {
       for (const taskLine of workerData.tasks) {
         members.push({
-          worker_id: workerData.worker_id,
+          user_id: workerData.user_id,
           project_id: taskLine.project_id || null,
           work_type_id: taskLine.work_type_id,
           task_id: taskLine.task_id,
@@ -732,7 +732,7 @@ async function saveTbmSession() {
   const members = [];
   selectedWorkersForNewTbm.forEach(workerId => {
     members.push({
-      worker_id: workerId,
+      user_id: workerId,
       project_id: projectId,
       work_type_id: workTypeId,
       task_id: null,
@@ -894,11 +894,11 @@ function openWorkerSelectionModal() {
   if (!workerCardGrid) return;
 
   // 이미 추가된 작업자 ID 세트
-  const addedWorkerIds = new Set(workerTaskList.map(w => w.worker_id));
+  const addedWorkerIds = new Set(workerTaskList.map(w => w.user_id));
 
   workerCardGrid.innerHTML = allWorkers.map(worker => {
-    const isAdded = addedWorkerIds.has(worker.worker_id);
-    const safeWorkerId = parseInt(worker.worker_id) || 0;
+    const isAdded = addedWorkerIds.has(worker.user_id);
+    const safeWorkerId = parseInt(worker.user_id) || 0;
     return `
       <div id="worker-card-${safeWorkerId}"
         onclick="toggleWorkerSelection(${safeWorkerId})"
@@ -923,7 +923,7 @@ window.openWorkerSelectionModal = openWorkerSelectionModal;
 // 작업자 선택 토글
 function toggleWorkerSelection(workerId) {
   // 이미 추가된 작업자는 선택 불가
-  const alreadyAdded = workerTaskList.some(w => w.worker_id === workerId);
+  const alreadyAdded = workerTaskList.some(w => w.user_id === workerId);
   if (alreadyAdded) return;
 
   const card = document.getElementById(`worker-card-${workerId}`);
@@ -945,11 +945,11 @@ window.toggleWorkerSelection = toggleWorkerSelection;
 
 // 전체 선택
 function selectAllWorkersInModal() {
-  const addedWorkerIds = new Set(workerTaskList.map(w => w.worker_id));
+  const addedWorkerIds = new Set(workerTaskList.map(w => w.user_id));
   allWorkers.forEach(worker => {
-    if (!addedWorkerIds.has(worker.worker_id)) {
-      selectedWorkersInModal.add(worker.worker_id);
-      const card = document.getElementById(`worker-card-${worker.worker_id}`);
+    if (!addedWorkerIds.has(worker.user_id)) {
+      selectedWorkersInModal.add(worker.user_id);
+      const card = document.getElementById(`worker-card-${worker.user_id}`);
       if (card) {
         card.style.borderColor = '#3b82f6';
         card.style.background = '#eff6ff';
@@ -982,10 +982,10 @@ function confirmWorkerSelection() {
   }
 
   selectedWorkersInModal.forEach(workerId => {
-    const worker = allWorkers.find(w => w.worker_id === workerId);
+    const worker = allWorkers.find(w => w.user_id === workerId);
     if (worker) {
       workerTaskList.push({
-        worker_id: worker.worker_id,
+        user_id: worker.user_id,
         worker_name: worker.worker_name,
         job_type: worker.job_type,
         tasks: [
@@ -1970,16 +1970,16 @@ async function openTeamCompositionModal(sessionId) {
 
     // 팀원별로 작업 그룹화
     teamMembers.forEach(member => {
-      if (!workerMap.has(member.worker_id)) {
-        workerMap.set(member.worker_id, {
-          worker_id: member.worker_id,
+      if (!workerMap.has(member.user_id)) {
+        workerMap.set(member.user_id, {
+          user_id: member.user_id,
           worker_name: member.worker_name,
           job_type: member.job_type,
           tasks: []
         });
       }
 
-      workerMap.get(member.worker_id).tasks.push({
+      workerMap.get(member.user_id).tasks.push({
         task_line_id: generateUUID(),
         project_id: member.project_id,
         work_type_id: member.work_type_id,
@@ -2003,7 +2003,7 @@ async function openTeamCompositionModal(sessionId) {
     // 입력자 표시
     if (session.leader_name) {
       document.getElementById('leaderName').value = `${session.leader_name} (${session.leader_job_type || ''})`;
-      document.getElementById('leaderId').value = session.leader_id;
+      document.getElementById('leaderId').value = session.leader_user_id;
     } else if (session.created_by_name) {
       document.getElementById('leaderName').value = `${session.created_by_name} (관리자)`;
       document.getElementById('leaderId').value = '';
@@ -2026,7 +2026,7 @@ function updateSelectedWorkers() {
   selectedWorkers.clear();
 
   document.querySelectorAll('.worker-checkbox:checked').forEach(cb => {
-    selectedWorkers.add(parseInt(cb.dataset.workerId));
+    selectedWorkers.add(parseInt(cb.dataset.userId));
   });
 
   const selectedCount = document.getElementById('selectedCount');
@@ -2038,7 +2038,7 @@ function updateSelectedWorkers() {
     selectedList.innerHTML = '<p style="margin: 0; color: #9ca3af; font-size: 0.875rem;">작업자를 선택해주세요</p>';
   } else {
     const selectedWorkersArray = Array.from(selectedWorkers).map(id => {
-      const worker = allWorkers.find(w => w.worker_id === id);
+      const worker = allWorkers.find(w => w.user_id === id);
       return worker ? `
         <span style="display: inline-flex; align-items: center; gap: 0.25rem; padding: 0.25rem 0.75rem; background: #3b82f6; color: white; border-radius: 9999px; font-size: 0.875rem;">
           ${worker.worker_name}
@@ -2053,7 +2053,7 @@ window.updateSelectedWorkers = updateSelectedWorkers;
 
 // 작업자 제거
 function removeWorker(workerId) {
-  const checkbox = document.querySelector(`.worker-checkbox[data-worker-id="${workerId}"]`);
+  const checkbox = document.querySelector(`.worker-checkbox[data-user-id="${workerId}"]`);
   if (checkbox) {
     checkbox.checked = false;
     updateSelectedWorkers();
@@ -2094,7 +2094,7 @@ async function saveTeamComposition() {
   }
 
   const members = Array.from(selectedWorkers).map(workerId => ({
-    worker_id: workerId
+    user_id: workerId
   }));
 
   try {
@@ -2427,7 +2427,7 @@ async function completeTbmSession() {
     }
 
     attendanceData.push({
-      worker_id: completeModalTeam[i].worker_id,
+      user_id: completeModalTeam[i].user_id,
       attendance_type: type,
       attendance_hours: hours
     });
@@ -2527,15 +2527,15 @@ async function viewTbmSession(sessionId) {
       // 작업자별로 그룹화
       const workerMap = new Map();
       team.forEach(member => {
-        if (!workerMap.has(member.worker_id)) {
-          workerMap.set(member.worker_id, {
+        if (!workerMap.has(member.user_id)) {
+          workerMap.set(member.user_id, {
             worker_name: member.worker_name,
             job_type: member.job_type,
             is_present: member.is_present,
             tasks: []
           });
         }
-        workerMap.get(member.worker_id).tasks.push(member);
+        workerMap.get(member.user_id).tasks.push(member);
       });
 
       teamContainer.style.display = 'flex';
@@ -2692,12 +2692,12 @@ async function openHandoverModal(sessionId) {
     const toLeaderSelect = document.getElementById('toLeaderId');
     const otherLeaders = allWorkers.filter(w =>
       (w.job_type === 'leader' || w.job_type === '그룹장' || w.job_type === 'admin') &&
-      w.worker_id !== session.leader_id
+      w.user_id !== session.leader_user_id
     );
 
     toLeaderSelect.innerHTML = '<option value="">인수자 선택...</option>' +
       otherLeaders.map(w => `
-        <option value="${w.worker_id}">${w.worker_name} (${w.job_type || ''})</option>
+        <option value="${w.user_id}">${w.worker_name} (${w.job_type || ''})</option>
       `).join('');
 
     // 인계할 팀원 목록
@@ -2710,7 +2710,7 @@ async function openHandoverModal(sessionId) {
                onmouseover="this.style.background='#f9fafb'" onmouseout="this.style.background='white'">
           <input type="checkbox"
                  class="handover-worker-checkbox"
-                 value="${member.worker_id}"
+                 value="${member.user_id}"
                  checked
                  style="width: 16px; height: 16px; cursor: pointer;">
           <span style="font-weight: 500; font-size: 0.875rem;">${member.worker_name}</span>
@@ -2771,9 +2771,9 @@ async function saveHandover() {
   }
 
   try {
-    // 세션 정보 조회 (from_leader_id 가져오기)
+    // 세션 정보 조회 (from_leader_user_id 가져오기)
     const sessionData = await window.TbmAPI.getSession(sessionId);
-    const fromLeaderId = sessionData?.leader_id;
+    const fromLeaderId = sessionData?.leader_user_id;
 
     if (!fromLeaderId) {
       showToast('세션 정보를 찾을 수 없습니다.', 'error');
@@ -2782,13 +2782,13 @@ async function saveHandover() {
 
     const handoverData = {
       session_id: sessionId,
-      from_leader_id: fromLeaderId,
-      to_leader_id: toLeaderId,
+      from_leader_user_id: fromLeaderId,
+      to_leader_user_id: toLeaderId,
       handover_date: handoverDate,
       handover_time: handoverTime,
       reason: reason,
       handover_notes: handoverNotes,
-      worker_ids: workerIds
+      user_ids: workerIds
     };
 
     const response = await window.TbmAPI.saveHandover(handoverData);
@@ -2855,12 +2855,12 @@ async function executeSplit(memberIdx) {
   }
   try {
     await window.TbmAPI.updateTeamMember(splitModalSessionId, {
-      worker_id: m.worker_id, project_id: m.project_id, work_type_id: m.work_type_id,
+      user_id: m.user_id, project_id: m.project_id, work_type_id: m.work_type_id,
       task_id: m.task_id, workplace_category_id: m.workplace_category_id, workplace_id: m.workplace_id,
       work_detail: m.work_detail, is_present: true, work_hours: splitHours
     });
     await window.TbmAPI.splitAssignment(splitModalSessionId, {
-      worker_id: m.worker_id, work_hours: currentHours - splitHours,
+      user_id: m.user_id, work_hours: currentHours - splitHours,
       project_id: m.project_id, work_type_id: m.work_type_id
     });
     showToast(`${escapeHtml(m.worker_name)} 분할 완료: ${splitHours}h + ${currentHours - splitHours}h`, 'success');
@@ -2934,8 +2934,8 @@ async function togglePullSessionMembers(sessionId, el) {
         <div style="display:flex; align-items:center; justify-content:space-between; padding:0.375rem 0; border-bottom:1px solid #f9fafb;">
           <span>${escapeHtml(m.worker_name)} <span style="font-size:0.75rem; color:#6b7280;">(${hours}h)</span></span>
           <div style="display:flex; gap:0.25rem; align-items:center;">
-            <input type="number" id="pull_h_${sessionId}_${m.worker_id}" step="0.5" min="0.5" max="${hours}" value="${hours}" style="width:60px; padding:0.25rem; border:1px solid #d1d5db; border-radius:0.25rem; font-size:0.75rem;">
-            <button type="button" class="tbm-btn tbm-btn-primary" style="padding:0.25rem 0.5rem; font-size:0.75rem;" onclick="executePull(${sessionId}, ${m.worker_id}, '${escapeHtml(m.worker_name)}')">빼오기</button>
+            <input type="number" id="pull_h_${sessionId}_${m.user_id}" step="0.5" min="0.5" max="${hours}" value="${hours}" style="width:60px; padding:0.25rem; border:1px solid #d1d5db; border-radius:0.25rem; font-size:0.75rem;">
+            <button type="button" class="tbm-btn tbm-btn-primary" style="padding:0.25rem 0.5rem; font-size:0.75rem;" onclick="executePull(${sessionId}, ${m.user_id}, '${escapeHtml(m.worker_name)}')">빼오기</button>
           </div>
         </div>`;
     }).join('') || '<div style="color:#9ca3af; padding:0.25rem;">팀원 없음</div>';
@@ -2954,7 +2954,7 @@ async function executePull(sourceSessionId, workerId, workerName) {
   try {
     const res = await window.TbmAPI.transfer({
       transfer_type: 'pull',
-      worker_id: workerId,
+      user_id: workerId,
       source_session_id: sourceSessionId,
       dest_session_id: pullModalSessionId,
       hours: hours
diff --git a/system1-factory/web/js/tbm/api.js b/system1-factory/web/js/tbm/api.js
index a0416d5..e730f45 100644
--- a/system1-factory/web/js/tbm/api.js
+++ b/system1-factory/web/js/tbm/api.js
@@ -18,7 +18,7 @@ class TbmAPI {
       // 현재 로그인한 사용자 정보 가져오기
       const userInfo = JSON.parse(localStorage.getItem('sso_user') || '{}');
       this.state.currentUser = userInfo;
-      console.log('👤 로그인 사용자:', this.state.currentUser, 'worker_id:', this.state.currentUser?.worker_id);
+      console.log('👤 로그인 사용자:', this.state.currentUser, 'user_id:', this.state.currentUser?.user_id);
 
       // 병렬로 데이터 로드
       await Promise.all([
diff --git a/system1-factory/web/js/tbm/state.js b/system1-factory/web/js/tbm/state.js
index 925cc2f..6e96f7d 100644
--- a/system1-factory/web/js/tbm/state.js
+++ b/system1-factory/web/js/tbm/state.js
@@ -77,7 +77,7 @@ class TbmState extends BaseState {
    */
   addWorkerToList(worker) {
     this.workerTaskList.push({
-      worker_id: worker.worker_id,
+      user_id: worker.user_id,
       worker_name: worker.worker_name,
       job_type: worker.job_type,
       tasks: [this.createEmptyTaskLine()]
diff --git a/system1-factory/web/js/vacation-allocation.js b/system1-factory/web/js/vacation-allocation.js
index 2a156e4..6bfe907 100644
--- a/system1-factory/web/js/vacation-allocation.js
+++ b/system1-factory/web/js/vacation-allocation.js
@@ -81,7 +81,7 @@ async function loadWorkers() {
     const selectWorker = document.getElementById('individualWorker');
     workers.forEach(worker => {
       const option = document.createElement('option');
-      option.value = worker.worker_id;
+      option.value = worker.user_id;
       option.textContent = `${worker.worker_name} (${worker.employment_status === 'employed' ? '재직' : '퇴사'})`;
       selectWorker.appendChild(option);
     });
@@ -293,7 +293,7 @@ async function autoCalculateAnnualLeave() {
   }
 
   // 작업자의 입사일 조회
-  const worker = workers.find(w => w.worker_id == workerId);
+  const worker = workers.find(w => w.user_id == workerId);
   if (!worker || !worker.hire_date) {
     showToast('작업자의 입사일 정보가 없습니다', 'error');
     return;
@@ -308,7 +308,7 @@ async function autoCalculateAnnualLeave() {
         'Content-Type': 'application/json'
       },
       body: JSON.stringify({
-        worker_id: workerId,
+        user_id: workerId,
         hire_date: worker.hire_date,
         year: year
       })
@@ -369,7 +369,7 @@ async function submitIndividualVacation() {
         'Content-Type': 'application/json'
       },
       body: JSON.stringify({
-        worker_id: workerId,
+        user_id: workerId,
         vacation_type_id: typeId,
         year: year,
         total_days: parseFloat(totalDays),
@@ -520,7 +520,7 @@ async function previewBulkAllocation() {
     const hireDate = worker.hire_date;
     if (!hireDate) {
       return {
-        worker_id: worker.worker_id,
+        user_id: worker.user_id,
         worker_name: worker.worker_name,
         hire_date: '-',
         years_worked: '-',
@@ -534,7 +534,7 @@ async function previewBulkAllocation() {
     const yearsWorked = calculateYearsWorked(hireDate, year);
 
     return {
-      worker_id: worker.worker_id,
+      user_id: worker.user_id,
       worker_name: worker.worker_name,
       hire_date: hireDate,
       years_worked: yearsWorked,
@@ -656,7 +656,7 @@ async function submitBulkAllocation() {
           'Content-Type': 'application/json'
         },
         body: JSON.stringify({
-          worker_id: item.worker_id,
+          user_id: item.user_id,
           hire_date: item.hire_date,
           year: year
         })
diff --git a/system1-factory/web/js/work-analysis/table-renderer.js b/system1-factory/web/js/work-analysis/table-renderer.js
index 6572f04..126e8a6 100644
--- a/system1-factory/web/js/work-analysis/table-renderer.js
+++ b/system1-factory/web/js/work-analysis/table-renderer.js
@@ -445,7 +445,7 @@ class WorkAnalysisTableRenderer {
         return workerData.map(worker => {
             // 해당 작업자의 작업 데이터 필터링
             const workerWork = recentWorkData ? 
-                recentWorkData.filter(work => work.worker_id === worker.worker_id) : [];
+                recentWorkData.filter(work => work.user_id === worker.user_id) : [];
 
             // 프로젝트별로 그룹화
             const projectMap = new Map();
diff --git a/system1-factory/web/js/work-report-manage.js b/system1-factory/web/js/work-report-manage.js
index a628878..2d75f71 100644
--- a/system1-factory/web/js/work-report-manage.js
+++ b/system1-factory/web/js/work-report-manage.js
@@ -47,7 +47,7 @@ async function loadReports() {
       return;
     }
 
-    const nameMap = Object.fromEntries(workers.map(w => [w.worker_id, w.worker_name]));
+    const nameMap = Object.fromEntries(workers.map(w => [w.user_id, w.worker_name]));
     const projMap = Object.fromEntries(projects.map(p => [p.project_id, p.project_name]));
     // const taskMap = Object.fromEntries(tasks.map(t => [t.task_id, `${t.category}:${t.subcategory}`])); // tasks 테이블 삭제됨
 
@@ -56,7 +56,7 @@ async function loadReports() {
       const tr = document.createElement('tr');
       tr.innerHTML = `
         <td>${i + 1}</td>
-        <td>${nameMap[r.worker_id] || r.worker_id}</td>
+        <td>${nameMap[r.user_id] || r.user_id}</td>
         <td><select data-id="project">
           ${projects.map(p =>
             `<option value="${p.project_id}" ${p.project_id === r.project_id ? 'selected' : ''}>${p.project_name}</option>`
@@ -107,7 +107,7 @@ async function loadReports() {
 
         const payload = {
           date: formatDate(r.date),  // 날짜 형식 변환
-          worker_id: r.worker_id,  // 기존 작업자 ID 유지
+          user_id: r.user_id,  // 기존 작업자 ID 유지
           project_id: Number(projectId),
           task_id: Number(taskId),
           overtime_hours: overtimeHours ? Number(overtimeHours) : null,
diff --git a/system1-factory/web/js/work-report-review.js b/system1-factory/web/js/work-report-review.js
index 7bd3ff4..3d9cc3b 100644
--- a/system1-factory/web/js/work-report-review.js
+++ b/system1-factory/web/js/work-report-review.js
@@ -142,8 +142,8 @@ class WorkReportReviewManager {
         }
         
         dummyAttendance.push({
-          id: `att_${worker.worker_id}_${dateStr}`,
-          worker_id: worker.worker_id,
+          id: `att_${worker.user_id}_${dateStr}`,
+          user_id: worker.user_id,
           worker_name: worker.worker_name,
           date: dateStr,
           attendance_type: attendanceType,
@@ -196,7 +196,7 @@ class WorkReportReviewManager {
       
       if (startDate) params.append('start_date', startDate);
       if (endDate) params.append('end_date', endDate);
-      if (workerId) params.append('worker_id', workerId);
+      if (workerId) params.append('user_id', workerId);
       if (projectId) params.append('project_id', projectId);
       
       // 페이지네이션 (일단 많이 가져오기)
@@ -250,26 +250,26 @@ class WorkReportReviewManager {
     // 각 보고서에 대해 근무시간 검증
     this.reports.forEach(report => {
       const attendance = this.attendanceData.find(att => 
-        att.worker_id === report.worker_id && att.date === report.report_date
+        att.user_id === report.user_id && att.date === report.report_date
       );
       
       if (attendance) {
         const expectedHours = attendance.expected_hours;
-        const actualHours = this.getWorkerDailyHours(report.worker_id, report.report_date);
-        
+        const actualHours = this.getWorkerDailyHours(report.user_id, report.report_date);
+
         report.expected_hours = expectedHours;
         report.actual_hours = actualHours;
         report.attendance_type = attendance.attendance_type;
         report.hours_status = this.getHoursStatus(actualHours, expectedHours);
-        report.is_reviewed = this.reviewedReports.has(`${report.worker_id}_${report.report_date}`);
+        report.is_reviewed = this.reviewedReports.has(`${report.user_id}_${report.report_date}`);
       } else {
         // 휴가 정보가 없으면 기본 8시간으로 가정
-        const actualHours = this.getWorkerDailyHours(report.worker_id, report.report_date);
+        const actualHours = this.getWorkerDailyHours(report.user_id, report.report_date);
         report.expected_hours = 8;
         report.actual_hours = actualHours;
         report.attendance_type = 'NORMAL';
         report.hours_status = this.getHoursStatus(actualHours, 8);
-        report.is_reviewed = this.reviewedReports.has(`${report.worker_id}_${report.report_date}`);
+        report.is_reviewed = this.reviewedReports.has(`${report.user_id}_${report.report_date}`);
       }
     });
   }
@@ -277,7 +277,7 @@ class WorkReportReviewManager {
   getWorkerDailyHours(workerId, date) {
     // 해당 작업자의 특정 날짜 총 작업시간 계산
     return this.reports
-      .filter(r => r.worker_id === workerId && r.report_date === date)
+      .filter(r => r.user_id === workerId && r.report_date === date)
       .reduce((sum, r) => sum + (r.work_hours || 0), 0);
   }
 
@@ -315,9 +315,9 @@ class WorkReportReviewManager {
               (Math.random() * 6 + 2); // 정상 시간 (2-8시간)
             
             dummyData.push({
-              id: 1000000 + i * 100 + worker.worker_id * 10 + j, // 고유 정수 ID
+              id: 1000000 + i * 100 + worker.user_id * 10 + j, // 고유 정수 ID
               report_date: dateStr,
-              worker_id: worker.worker_id,
+              user_id: worker.user_id,
               worker_name: worker.worker_name,
               project_id: this.projects[Math.floor(Math.random() * this.projects.length)]?.project_id || 1,
               project_name: this.projects[Math.floor(Math.random() * this.projects.length)]?.project_name || 'Unknown',
@@ -344,7 +344,7 @@ class WorkReportReviewManager {
     if (workerSelect) {
       workerSelect.innerHTML = '<option value="">전체 작업자</option>';
       this.workers.forEach(worker => {
-        workerSelect.innerHTML += `<option value="${worker.worker_id}">${worker.worker_name}</option>`;
+        workerSelect.innerHTML += `<option value="${worker.user_id}">${worker.worker_name}</option>`;
       });
     }
 
@@ -540,7 +540,7 @@ class WorkReportReviewManager {
     const grouped = {};
     
     this.filteredReports.forEach(report => {
-      const key = `${report.worker_id}_${report.report_date}`;
+      const key = `${report.user_id}_${report.report_date}`;
       if (!grouped[key]) {
         grouped[key] = [];
       }
@@ -569,7 +569,7 @@ class WorkReportReviewManager {
   selectWorkerDate(workerId, date) {
     // 해당 작업자의 특정 날짜 보고서들을 선택
     const reports = this.filteredReports.filter(r => 
-      r.worker_id == workerId && r.report_date === date
+      r.user_id == workerId && r.report_date === date
     );
     
     if (reports.length > 0) {
@@ -600,7 +600,7 @@ class WorkReportReviewManager {
       // const response = await fetch(`${API}/daily-work-reports/review`, {
       //   method: 'POST',
       //   headers: { ...getAuthHeaders(), 'Content-Type': 'application/json' },
-      //   body: JSON.stringify({ worker_id: workerId, report_date: date, reviewed: true })
+      //   body: JSON.stringify({ user_id: workerId, report_date: date, reviewed: true })
       // });
       
       // 현재는 로컬 상태만 업데이트
@@ -608,7 +608,7 @@ class WorkReportReviewManager {
       
       // 해당 보고서들의 검토 상태 업데이트
       this.reports.forEach(report => {
-        if (report.worker_id == workerId && report.report_date === date) {
+        if (report.user_id == workerId && report.report_date === date) {
           report.is_reviewed = true;
         }
       });
@@ -627,7 +627,7 @@ class WorkReportReviewManager {
   }
 
   getWorkerName(workerId) {
-    const worker = this.workers.find(w => w.worker_id == workerId);
+    const worker = this.workers.find(w => w.user_id == workerId);
     return worker ? worker.worker_name : `작업자${workerId}`;
   }
 
@@ -680,7 +680,7 @@ class WorkReportReviewManager {
       
       <div class="panel-actions">
         ${!report.is_reviewed && report.hours_status === 'NORMAL' && !allReports.some(r => r.work_status_id === 2) ? 
-          `<button type="button" class="panel-btn save" onclick="workReportReview.markAsReviewed('${report.worker_id}', '${report.report_date}')">
+          `<button type="button" class="panel-btn save" onclick="workReportReview.markAsReviewed('${report.user_id}', '${report.report_date}')">
             ✅ 검토완료 처리
           </button>` : ''
         }
diff --git a/system1-factory/web/js/work-review.js b/system1-factory/web/js/work-review.js
index ef1a80b..1ce6c1a 100644
--- a/system1-factory/web/js/work-review.js
+++ b/system1-factory/web/js/work-review.js
@@ -179,7 +179,7 @@ function processDayData(dateStr, works) {
 
   works.forEach(work => {
     dayData.totalHours += parseFloat(work.work_hours || 0);
-    dayData.workers.add(work.worker_name || work.worker_id);
+    dayData.workers.add(work.worker_name || work.user_id);
   });
 
   const workType = classifyWorkType(dayData.totalHours);
@@ -217,7 +217,7 @@ function renderDayInfo() {
   
   // 작업자별 상세 정보 생성
   const workerDetailsHtml = Array.from(data.workers).map(worker => {
-    const workerWorks = data.details.filter(w => (w.worker_name || w.worker_id) === worker);
+    const workerWorks = data.details.filter(w => (w.worker_name || w.user_id) === worker);
     const workerHours = workerWorks.reduce((sum, w) => sum + parseFloat(w.work_hours || 0), 0);
     
     const workerWorkItemsHtml = workerWorks.map(work => `
@@ -563,7 +563,7 @@ async function deleteWorkerAllWorks(date, workerName) {
   try {
     if (!selectedDateData) return;
     
-    const workerWorks = selectedDateData.details.filter(w => (w.worker_name || w.worker_id) === workerName);
+    const workerWorks = selectedDateData.details.filter(w => (w.worker_name || w.user_id) === workerName);
     
     if (workerWorks.length === 0) {
       showMessage('삭제할 작업이 없습니다.', 'error');
diff --git a/system1-factory/web/js/worker-individual-report.js b/system1-factory/web/js/worker-individual-report.js
index 68115dc..d3604d3 100644
--- a/system1-factory/web/js/worker-individual-report.js
+++ b/system1-factory/web/js/worker-individual-report.js
@@ -15,7 +15,7 @@ let existingWork = [];
 function getUrlParams() {
   const urlParams = new URLSearchParams(window.location.search);
   return {
-    worker_id: urlParams.get('worker_id'),
+    user_id: urlParams.get('user_id'),
     worker_name: decodeURIComponent(urlParams.get('worker_name') || ''),
     date: urlParams.get('date') || new Date().toISOString().split('T')[0]
   };
@@ -88,7 +88,7 @@ async function initializePage() {
   
   // URL 파라미터 추출
   const params = getUrlParams();
-  currentWorkerId = parseInt(params.worker_id);
+  currentWorkerId = parseInt(params.user_id);
   currentWorkerName = params.worker_name;
   selectedDate = params.date;
   
@@ -189,7 +189,7 @@ async function loadWorkerInfo() {
 
 async function loadExistingWork() {
   try {
-    const response = await window.apiCall(`/daily-work-reports?date=${selectedDate}&worker_id=${currentWorkerId}`);
+    const response = await window.apiCall(`/daily-work-reports?date=${selectedDate}&user_id=${currentWorkerId}`);
     existingWork = Array.isArray(response) ? response : (response.data || []);
     console.log(`✅ 기존 작업 ${existingWork.length}건 로드 완료`);
   } catch (error) {
@@ -398,7 +398,7 @@ async function saveNewWork() {
     
     const workData = {
       report_date: selectedDate,
-      worker_id: currentWorkerId,
+      user_id: currentWorkerId,
       project_id: parseInt(projectId),
       work_type_id: parseInt(workTypeId),
       work_status_id: parseInt(workStatusId),
@@ -477,7 +477,7 @@ async function handleVacationProcess(vacationType) {
     // 휴가용 작업 보고서 생성
     const vacationWork = {
       report_date: selectedDate,
-      worker_id: currentWorkerId,
+      user_id: currentWorkerId,
       project_id: 1, // 기본 프로젝트 (휴가용)
       work_type_id: 999, // 휴가 전용 작업 유형 (DB에 추가 필요)
       work_status_id: 1, // 정상 상태
diff --git a/system1-factory/web/js/worker-management.js b/system1-factory/web/js/worker-management.js
index 94c03a3..a85486c 100644
--- a/system1-factory/web/js/worker-management.js
+++ b/system1-factory/web/js/worker-management.js
@@ -331,7 +331,7 @@ function renderWorkerList() {
             statusText = '사무직';
           }
 
-          const safeWorkerId = parseInt(worker.worker_id) || 0;
+          const safeWorkerId = parseInt(worker.user_id) || 0;
           const safeWorkerName = escapeHtml(worker.worker_name || '');
           const firstChar = safeWorkerName ? safeWorkerName.charAt(0) : '?';
 
@@ -406,7 +406,7 @@ function openWorkerModal(workerId = null) {
   }
 
   if (workerId) {
-    const worker = allWorkers.find(w => w.worker_id === workerId);
+    const worker = allWorkers.find(w => w.user_id === workerId);
     if (!worker) {
       showToast('작업자를 찾을 수 없습니다.', 'error');
       return;
@@ -416,7 +416,7 @@ function openWorkerModal(workerId = null) {
     title.textContent = '작업자 정보 수정';
     deleteBtn.style.display = 'inline-flex';
 
-    document.getElementById('workerId').value = worker.worker_id;
+    document.getElementById('workerId').value = worker.user_id;
     document.getElementById('workerName').value = worker.worker_name || '';
     document.getElementById('jobType').value = worker.job_type || 'worker';
     document.getElementById('joinDate').value = worker.join_date ? worker.join_date.split('T')[0] : '';
@@ -508,7 +508,7 @@ async function saveWorker() {
 
 // 작업자 삭제 확인
 function confirmDeleteWorker(workerId) {
-  const worker = allWorkers.find(w => w.worker_id === workerId);
+  const worker = allWorkers.find(w => w.user_id === workerId);
   if (!worker) {
     showToast('작업자를 찾을 수 없습니다.', 'error');
     return;
@@ -524,7 +524,7 @@ function confirmDeleteWorker(workerId) {
 // 작업자 삭제 (모달에서)
 function deleteWorker() {
   if (currentEditingWorker) {
-    confirmDeleteWorker(currentEditingWorker.worker_id);
+    confirmDeleteWorker(currentEditingWorker.user_id);
   }
 }
 
diff --git a/system1-factory/web/pages/admin/attendance-report.html b/system1-factory/web/pages/admin/attendance-report.html
index da24f50..28a1568 100644
--- a/system1-factory/web/pages/admin/attendance-report.html
+++ b/system1-factory/web/pages/admin/attendance-report.html
@@ -271,7 +271,7 @@
           const select = document.getElementById('workerFilter');
           workers.forEach(worker => {
             const option = document.createElement('option');
-            option.value = worker.worker_id;
+            option.value = worker.user_id;
             option.textContent = worker.worker_name;
             select.appendChild(option);
           });
@@ -297,7 +297,7 @@
           params: {
             start_date: startDate,
             end_date: endDate,
-            worker_id: workerId || undefined
+            user_id: workerId || undefined
           }
         });
 
@@ -306,7 +306,7 @@
           params: {
             start_date: startDate,
             end_date: endDate,
-            worker_id: workerId || undefined
+            user_id: workerId || undefined
           }
         });
 
@@ -340,10 +340,10 @@
 
       // 출퇴근 기록 맵핑
       attendanceRecords.forEach(record => {
-        const key = `${record.attendance_date}_${record.worker_id}`;
+        const key = `${record.attendance_date}_${record.user_id}`;
         dateWorkerMap.set(key, {
           date: record.attendance_date,
-          worker_id: record.worker_id,
+          user_id: record.user_id,
           worker_name: record.worker_name,
           attendance: record,
           reports: []
@@ -352,13 +352,13 @@
 
       // 작업 보고서 맵핑
       workReports.forEach(report => {
-        const key = `${report.report_date}_${report.worker_id}`;
+        const key = `${report.report_date}_${report.user_id}`;
         if (dateWorkerMap.has(key)) {
           dateWorkerMap.get(key).reports.push(report);
         } else {
           dateWorkerMap.set(key, {
             date: report.report_date,
-            worker_id: report.worker_id,
+            user_id: report.user_id,
             worker_name: report.worker_name,
             attendance: null,
             reports: [report]
diff --git a/system1-factory/web/pages/admin/repair-management.html b/system1-factory/web/pages/admin/repair-management.html
index 024e62a..ecb9a6a 100644
--- a/system1-factory/web/pages/admin/repair-management.html
+++ b/system1-factory/web/pages/admin/repair-management.html
@@ -499,7 +499,7 @@
         function populateAssigneeDropdown() {
             const select = document.getElementById('receiveAssignee');
             select.innerHTML = '<option value="">담당자 선택</option>' +
-                workers.map(w => `<option value="${w.worker_id}">${w.worker_name} (${w.job_type || ''})</option>`).join('');
+                workers.map(w => `<option value="${w.user_id}">${w.worker_name} (${w.job_type || ''})</option>`).join('');
         }
 
         async function loadRepairRequests() {
diff --git a/system1-factory/web/pages/attendance/annual-overview.html b/system1-factory/web/pages/attendance/annual-overview.html
index 6135319..a29e851 100644
--- a/system1-factory/web/pages/attendance/annual-overview.html
+++ b/system1-factory/web/pages/attendance/annual-overview.html
@@ -392,7 +392,7 @@
         // 데이터 정리
         vacationData = {};
         workers.forEach(w => {
-          vacationData[w.worker_id] = {
+          vacationData[w.user_id] = {
             carryover: 0,
             annual: 0,
             longService: 0,
@@ -403,9 +403,9 @@
 
         // 잔액 데이터 매핑
         balances.forEach(b => {
-          if (!vacationData[b.worker_id]) return;
+          if (!vacationData[b.user_id]) return;
           const code = b.type_code || '';
-          const data = vacationData[b.worker_id];
+          const data = vacationData[b.user_id];
 
           if (code === 'CARRYOVER' || b.type_name === '이월') {
             data.carryover = b.total_days || 0;
@@ -443,7 +443,7 @@
       }
 
       tbody.innerHTML = workers.map((w, idx) => {
-        const d = vacationData[w.worker_id] || { carryover: 0, annual: 0, longService: 0, specials: [], totalUsed: 0 };
+        const d = vacationData[w.user_id] || { carryover: 0, annual: 0, longService: 0, specials: [], totalUsed: 0 };
         const carryover = parseFloat(d.carryover) || 0;
         const annual = parseFloat(d.annual) || 0;
         const longService = parseFloat(d.longService) || 0;
@@ -454,29 +454,29 @@
         const remainingClass = remaining > 0 ? 'positive' : remaining < 0 ? 'negative' : 'zero';
 
         return `
-          <tr data-worker-id="${w.worker_id}">
+          <tr data-user-id="${w.user_id}">
             <td>${idx + 1}</td>
             <td class="worker-name">${w.worker_name}</td>
             <td>
               <input type="number" class="num-input ${carryover < 0 ? 'negative' : ''}"
                      value="${carryover}" step="0.5"
                      data-field="carryover"
-                     onchange="updateField(${w.worker_id}, 'carryover', this.value)">
+                     onchange="updateField(${w.user_id}, 'carryover', this.value)">
             </td>
             <td>
               <input type="number" class="num-input"
                      value="${annual}" step="0.5"
                      data-field="annual"
-                     onchange="updateField(${w.worker_id}, 'annual', this.value)">
+                     onchange="updateField(${w.user_id}, 'annual', this.value)">
             </td>
             <td>
               <input type="number" class="num-input"
                      value="${longService}" step="0.5"
                      data-field="longService"
-                     onchange="updateField(${w.worker_id}, 'longService', this.value)">
+                     onchange="updateField(${w.user_id}, 'longService', this.value)">
             </td>
             <td>
-              <button class="special-btn" onclick="openSpecialModal(${w.worker_id}, '${w.worker_name}')">
+              <button class="special-btn" onclick="openSpecialModal(${w.user_id}, '${w.worker_name}')">
                 ${(d.specials || []).length > 0 ? `${specialTotal}일` : '추가'}
                 ${(d.specials || []).length > 0 ? `<span class="special-count">${d.specials.length}</span>` : ''}
               </button>
@@ -497,7 +497,7 @@
       vacationData[workerId][field] = val;
 
       // 입력 스타일 업데이트
-      const input = document.querySelector(`tr[data-worker-id="${workerId}"] input[data-field="${field}"]`);
+      const input = document.querySelector(`tr[data-user-id="${workerId}"] input[data-field="${field}"]`);
       if (input) {
         input.classList.toggle('negative', val < 0);
       }
@@ -508,7 +508,7 @@
     }
 
     function updateRowTotals(workerId) {
-      const row = document.querySelector(`tr[data-worker-id="${workerId}"]`);
+      const row = document.querySelector(`tr[data-user-id="${workerId}"]`);
       if (!row) return;
 
       const d = vacationData[workerId];
@@ -668,12 +668,12 @@
 
       // 데이터 수집
       for (const w of workers) {
-        const d = vacationData[w.worker_id];
+        const d = vacationData[w.user_id];
         if (!d) continue;
 
         if (typeIdMap['CARRYOVER']) {
           balancesToSave.push({
-            worker_id: w.worker_id,
+            user_id: w.user_id,
             vacation_type_id: typeIdMap['CARRYOVER'],
             year: currentYear,
             total_days: d.carryover
@@ -681,7 +681,7 @@
         }
         if (typeIdMap['ANNUAL']) {
           balancesToSave.push({
-            worker_id: w.worker_id,
+            user_id: w.user_id,
             vacation_type_id: typeIdMap['ANNUAL'],
             year: currentYear,
             total_days: d.annual
@@ -689,7 +689,7 @@
         }
         if (typeIdMap['LONG_SERVICE']) {
           balancesToSave.push({
-            worker_id: w.worker_id,
+            user_id: w.user_id,
             vacation_type_id: typeIdMap['LONG_SERVICE'],
             year: currentYear,
             total_days: d.longService
@@ -726,7 +726,7 @@
             }
             if (specialTypeId) {
               balancesToSave.push({
-                worker_id: w.worker_id,
+                user_id: w.user_id,
                 vacation_type_id: specialTypeId,
                 year: currentYear,
                 total_days: special.days,
diff --git a/system1-factory/web/pages/attendance/checkin.html b/system1-factory/web/pages/attendance/checkin.html
index 8878804..1d40db0 100644
--- a/system1-factory/web/pages/attendance/checkin.html
+++ b/system1-factory/web/pages/attendance/checkin.html
@@ -270,18 +270,18 @@
 
         checkinStatus = {};
         workers.forEach(w => {
-          const checkin = checkinList.find(c => c.worker_id === w.worker_id);
-          const record = records.find(r => r.worker_id === w.worker_id);
+          const checkin = checkinList.find(c => c.user_id === w.user_id);
+          const record = records.find(r => r.user_id === w.user_id);
 
           if (checkin?.vacation_status === 'approved' || record?.vacation_type_id) {
-            checkinStatus[w.worker_id] = { status: 'vacation', vacationType: checkin?.vacation_type_name || record?.vacation_type_name || '연차' };
+            checkinStatus[w.user_id] = { status: 'vacation', vacationType: checkin?.vacation_type_name || record?.vacation_type_name || '연차' };
           } else if (record && record.is_present === 0) {
-            checkinStatus[w.worker_id] = { status: 'absent' };
+            checkinStatus[w.user_id] = { status: 'absent' };
           } else if (record && record.is_present === 1) {
-            checkinStatus[w.worker_id] = { status: 'present' };
+            checkinStatus[w.user_id] = { status: 'present' };
           } else {
             // 기록이 없으면 기본 출근
-            checkinStatus[w.worker_id] = { status: 'present' };
+            checkinStatus[w.user_id] = { status: 'present' };
           }
         });
 
@@ -301,9 +301,9 @@
       }
 
       container.innerHTML = workers.map(w => {
-        const s = checkinStatus[w.worker_id] || { status: 'present' };
+        const s = checkinStatus[w.user_id] || { status: 'present' };
         const label = s.status === 'present' ? '출근' : s.status === 'absent' ? '결근' : (s.vacationType || '연차');
-        return `<span class="worker-chip ${s.status}" onclick="toggle(${w.worker_id})"><span class="chip-dot"></span>${w.worker_name} <small style="color:#6b7280">${label}</small></span>`;
+        return `<span class="worker-chip ${s.status}" onclick="toggle(${w.user_id})"><span class="chip-dot"></span>${w.worker_name} <small style="color:#6b7280">${label}</small></span>`;
       }).join('');
 
       updateSummary();
@@ -318,8 +318,8 @@
 
     function setAllPresent() {
       workers.forEach(w => {
-        if (checkinStatus[w.worker_id]?.status !== 'vacation') {
-          checkinStatus[w.worker_id] = { status: 'present' };
+        if (checkinStatus[w.user_id]?.status !== 'vacation') {
+          checkinStatus[w.user_id] = { status: 'present' };
         }
       });
       render();
@@ -327,8 +327,8 @@
 
     function setAllAbsent() {
       workers.forEach(w => {
-        if (checkinStatus[w.worker_id]?.status !== 'vacation') {
-          checkinStatus[w.worker_id] = { status: 'absent' };
+        if (checkinStatus[w.user_id]?.status !== 'vacation') {
+          checkinStatus[w.user_id] = { status: 'absent' };
         }
       });
       render();
@@ -374,10 +374,10 @@
 
       // 연차가 아닌 작업자들만 체크인 데이터로 전송
       const checkins = workers
-        .filter(w => checkinStatus[w.worker_id]?.status !== 'vacation')
+        .filter(w => checkinStatus[w.user_id]?.status !== 'vacation')
         .map(w => ({
-          worker_id: w.worker_id,
-          is_present: checkinStatus[w.worker_id]?.status === 'present'
+          user_id: w.user_id,
+          is_present: checkinStatus[w.user_id]?.status === 'present'
         }));
 
       try {
diff --git a/system1-factory/web/pages/attendance/daily.html b/system1-factory/web/pages/attendance/daily.html
index 0009977..57d4b48 100644
--- a/system1-factory/web/pages/attendance/daily.html
+++ b/system1-factory/web/pages/attendance/daily.html
@@ -177,7 +177,7 @@
 
         // 체크인 목록을 기준으로 출퇴근 기록 생성 (연차 정보 포함)
         attendanceRecords = checkinList.map(worker => {
-          const existingRecord = existingRecords.find(r => r.worker_id === worker.worker_id);
+          const existingRecord = existingRecords.find(r => r.user_id === worker.user_id);
           const isOnVacation = worker.vacation_status === 'approved';
 
           // 기존 기록이 있으면 사용, 없으면 초기화
@@ -185,7 +185,7 @@
             return existingRecord;
           } else {
             return {
-              worker_id: worker.worker_id,
+              user_id: worker.user_id,
               worker_name: worker.worker_name,
               attendance_date: selectedDate,
               total_hours: isOnVacation ? 0 : 8,
@@ -209,7 +209,7 @@
     function initializeAttendanceRecords() {
       const selectedDate = document.getElementById('selectedDate').value;
       attendanceRecords = workers.map(worker => ({
-        worker_id: worker.worker_id,
+        user_id: worker.user_id,
         worker_name: worker.worker_name,
         attendance_date: selectedDate,
         total_hours: 8,
@@ -351,7 +351,7 @@
 
       // 모든 기록을 API 형식에 맞게 변환
       const recordsToSave = attendanceRecords.map(record => ({
-        worker_id: record.worker_id,
+        user_id: record.user_id,
         attendance_date: selectedDate,
         total_hours: record.total_hours || 0,
         overtime_hours: record.overtime_hours || 0,
@@ -371,7 +371,7 @@
               successCount++;
             }
           } catch (error) {
-            console.error(`작업자 ${data.worker_id} 저장 오류:`, error);
+            console.error(`작업자 ${data.user_id} 저장 오류:`, error);
             errorCount++;
           }
         }
diff --git a/system1-factory/web/pages/attendance/monthly.html b/system1-factory/web/pages/attendance/monthly.html
index 2bcf539..576e4f5 100644
--- a/system1-factory/web/pages/attendance/monthly.html
+++ b/system1-factory/web/pages/attendance/monthly.html
@@ -662,7 +662,7 @@
             const records = response.data.data;
             // 작업자별로 데이터 정리
             records.forEach(record => {
-              const workerId = record.worker_id;
+              const workerId = record.user_id;
               // 날짜 형식 정규화 (다양한 형식 처리)
               let dateKey = record.record_date;
               if (dateKey) {
@@ -686,7 +686,7 @@
           console.error('근태 데이터 조회 오류:', err);
           // 작업자별 빈 데이터 초기화
           workers.forEach(worker => {
-            attendanceData[worker.worker_id] = {};
+            attendanceData[worker.user_id] = {};
           });
         }
 
@@ -765,7 +765,7 @@
       html += `<tbody>`;
 
       workers.forEach((worker, index) => {
-        const workerRecords = attendanceData[worker.worker_id] || {};
+        const workerRecords = attendanceData[worker.user_id] || {};
         let totalOvertimeHours = 0;
 
         // 입사일 파싱
@@ -954,7 +954,7 @@
       let totalNormalDays = 0;
 
       workers.forEach(worker => {
-        const records = attendanceData[worker.worker_id] || {};
+        const records = attendanceData[worker.user_id] || {};
         Object.values(records).forEach(record => {
           const hours = parseFloat(record.total_work_hours) || 0;
           totalWorkHours += hours;
diff --git a/system1-factory/web/pages/attendance/my-vacation-info.html b/system1-factory/web/pages/attendance/my-vacation-info.html
index fb147ac..105df28 100644
--- a/system1-factory/web/pages/attendance/my-vacation-info.html
+++ b/system1-factory/web/pages/attendance/my-vacation-info.html
@@ -306,13 +306,13 @@
         document.getElementById('adminControls').classList.add('visible');
         await loadWorkers();
       } else {
-        // 일반 사용자: 본인 worker_id 사용
-        if (currentUser?.worker_id) {
-          currentWorkerId = currentUser.worker_id;
+        // 일반 사용자: 본인 user_id 사용
+        if (currentUser?.user_id) {
+          currentWorkerId = currentUser.user_id;
           document.getElementById('infoGrid').style.display = 'grid';
           await loadAllData();
         } else {
-          // worker_id가 없는 경우
+          // user_id가 없는 경우
           document.getElementById('noWorkerMessage').style.display = 'block';
         }
       }
@@ -352,7 +352,7 @@
         const select = document.getElementById('workerSelect');
         workers.forEach(w => {
           const opt = document.createElement('option');
-          opt.value = w.worker_id;
+          opt.value = w.user_id;
           opt.textContent = w.worker_name;
           select.appendChild(opt);
         });
@@ -369,7 +369,7 @@
       }
 
       currentWorkerId = parseInt(workerId);
-      const worker = workers.find(w => w.worker_id === currentWorkerId);
+      const worker = workers.find(w => w.user_id === currentWorkerId);
       document.getElementById('workerNameDisplay').textContent =
         `${worker?.worker_name || ''}님의 연차 잔여 현황 및 월간 연장근로 시간`;
       document.getElementById('infoGrid').style.display = 'grid';
@@ -486,7 +486,7 @@
 
       try {
         // 근태 기록에서 연장근로 데이터 조회
-        const res = await axios.get(`/attendance/records?start_date=${startDate}&end_date=${endDate}&worker_id=${currentWorkerId}`);
+        const res = await axios.get(`/attendance/records?start_date=${startDate}&end_date=${endDate}&user_id=${currentWorkerId}`);
         const records = res.data.data || [];
 
         // 8시간 초과분 계산
diff --git a/system1-factory/web/pages/attendance/vacation-input.html b/system1-factory/web/pages/attendance/vacation-input.html
index 8ce6c43..c9a2f03 100644
--- a/system1-factory/web/pages/attendance/vacation-input.html
+++ b/system1-factory/web/pages/attendance/vacation-input.html
@@ -222,7 +222,7 @@
       event.preventDefault();
 
       const data = {
-        worker_id: parseInt(document.getElementById('inputWorker').value),
+        user_id: parseInt(document.getElementById('inputWorker').value),
         vacation_type_id: parseInt(document.getElementById('inputVacationType').value),
         start_date: document.getElementById('inputStartDate').value,
         end_date: document.getElementById('inputEndDate').value,
diff --git a/system1-factory/web/pages/attendance/vacation-management.html b/system1-factory/web/pages/attendance/vacation-management.html
index 227a86d..d38afef 100644
--- a/system1-factory/web/pages/attendance/vacation-management.html
+++ b/system1-factory/web/pages/attendance/vacation-management.html
@@ -369,7 +369,7 @@
       event.preventDefault();
 
       const data = {
-        worker_id: parseInt(document.getElementById('inputWorker').value),
+        user_id: parseInt(document.getElementById('inputWorker').value),
         vacation_type_id: parseInt(document.getElementById('inputVacationType').value),
         start_date: document.getElementById('inputStartDate').value,
         end_date: document.getElementById('inputEndDate').value,
diff --git a/system1-factory/web/pages/attendance/vacation-request.html b/system1-factory/web/pages/attendance/vacation-request.html
index b4407e3..56459e8 100644
--- a/system1-factory/web/pages/attendance/vacation-request.html
+++ b/system1-factory/web/pages/attendance/vacation-request.html
@@ -155,7 +155,7 @@
       try {
         const currentUser = getCurrentUser();
 
-        if (!currentUser || !currentUser.worker_id) {
+        if (!currentUser || !currentUser.user_id) {
           alert('작업자 정보가 없습니다. 관리자에게 문의하세요.');
           return;
         }
@@ -179,7 +179,7 @@
       const currentUser = getCurrentUser();
 
       try {
-        const response = await axios.get(`/attendance/vacation-balance/${currentUser.worker_id}`);
+        const response = await axios.get(`/attendance/vacation-balance/${currentUser.user_id}`);
         if (response.data.success) {
           renderVacationBalance(response.data.data);
         }
@@ -222,7 +222,7 @@
 
       const currentUser = getCurrentUser();
       const data = {
-        worker_id: currentUser.worker_id,
+        user_id: currentUser.user_id,
         vacation_type_id: parseInt(document.getElementById('vacationType').value),
         start_date: document.getElementById('startDate').value,
         end_date: document.getElementById('endDate').value,
@@ -251,7 +251,7 @@
         if (response.data.success) {
           // 내 신청만 필터링
           const myRequests = response.data.data.filter(req =>
-            req.requested_by === currentUser.user_id || req.worker_id === currentUser.worker_id
+            req.requested_by === currentUser.user_id || req.user_id === currentUser.user_id
           );
           renderVacationRequests(myRequests, 'myRequestsList', true, 'delete');
         }
diff --git a/system1-factory/web/pages/attendance/work-status.html b/system1-factory/web/pages/attendance/work-status.html
index 13600c3..b167d35 100644
--- a/system1-factory/web/pages/attendance/work-status.html
+++ b/system1-factory/web/pages/attendance/work-status.html
@@ -329,7 +329,7 @@
 
         workStatus = {};
         workers.forEach(w => {
-          const record = records.find(r => r.worker_id === w.worker_id);
+          const record = records.find(r => r.user_id === w.user_id);
 
           // 입사일 이전인지 확인
           const joinDate = w.join_date ? w.join_date.split('T')[0] : null;
@@ -337,7 +337,7 @@
 
           if (isBeforeJoin) {
             // 입사 전 날짜
-            workStatus[w.worker_id] = {
+            workStatus[w.user_id] = {
               isPresent: false,
               type: 'not_hired',
               hours: 0,
@@ -396,7 +396,7 @@
 
             const typeInfo = attendanceTypes.find(t => t.value === type);
 
-            workStatus[w.worker_id] = {
+            workStatus[w.user_id] = {
               isPresent: record.is_present === 1 || typeInfo?.isLeave,
               type: type,
               hours: typeInfo !== undefined ? typeInfo.hours : 8,
@@ -406,7 +406,7 @@
             };
           } else {
             // 출근 체크 기록이 없는 경우 - 결근 상태
-            workStatus[w.worker_id] = {
+            workStatus[w.user_id] = {
               isPresent: false,
               type: 'normal',
               hours: 8,
@@ -435,7 +435,7 @@
       }
 
       tbody.innerHTML = workers.map((w, idx) => {
-        const s = workStatus[w.worker_id];
+        const s = workStatus[w.user_id];
 
         // 미입사 상태 처리
         if (s.isNotHired) {
@@ -503,7 +503,7 @@
               ${statusText}
             </td>
             <td>
-              <select class="type-select" onchange="updateType(${w.worker_id}, this.value)">
+              <select class="type-select" onchange="updateType(${w.user_id}, this.value)">
                 ${attendanceTypes.map(t => `
                   <option value="${t.value}" ${s.type === t.value ? 'selected' : ''}>${t.label}</option>
                 `).join('')}
@@ -513,7 +513,7 @@
             <td class="hours-cell">
               ${showOvertimeInput ? `
                 <input type="number" class="overtime-input" value="${s.overtimeHours}" min="0" max="8" step="0.5"
-                       onchange="updateOvertime(${w.worker_id}, this.value)">
+                       onchange="updateOvertime(${w.user_id}, this.value)">
               ` : '-'}
             </td>
             <td class="hours-cell"><strong>${totalHours}h</strong></td>
@@ -551,9 +551,9 @@
 
     function setAllNormal() {
       workers.forEach(w => {
-        workStatus[w.worker_id].type = 'normal';
-        workStatus[w.worker_id].hours = 8;
-        workStatus[w.worker_id].overtimeHours = 0;
+        workStatus[w.user_id].type = 'normal';
+        workStatus[w.user_id].hours = 8;
+        workStatus[w.user_id].overtimeHours = 0;
       });
       render();
       updateSummary();
@@ -638,14 +638,14 @@
 
       // 미입사자 제외하고 저장할 데이터 생성
       const recordsToSave = workers
-        .filter(w => !workStatus[w.worker_id]?.isNotHired)
+        .filter(w => !workStatus[w.user_id]?.isNotHired)
         .map(w => {
-          const s = workStatus[w.worker_id];
+          const s = workStatus[w.user_id];
           const totalHours = s.type === 'overtime' ? s.hours + s.overtimeHours : s.hours;
 
           return {
             record_date: date,
-            worker_id: w.worker_id,
+            user_id: w.user_id,
             attendance_type_id: typeIdMap[s.type] || 1,
             vacation_type_id: vacationTypeIdMap[s.type] || null,
             total_work_hours: totalHours,
@@ -674,8 +674,8 @@
           alert(`${ok}명 저장 완료`);
           isAlreadySaved = true;
           workers.forEach(w => {
-            if (workStatus[w.worker_id]) {
-              workStatus[w.worker_id].isSaved = true;
+            if (workStatus[w.user_id]) {
+              workStatus[w.user_id].isSaved = true;
             }
           });
           render();