fix(sprint004): 코드 리뷰 반영 — vacation_days 소수 + 이중제출 방지 + deprecated 테이블 전환

- monthlyComparisonModel: vacation_types.deduct_days AS vacation_days 추가
- monthlyComparisonController: vacationDays++ → parseFloat(attend.vacation_days) 소수 지원
- monthly-comparison.js: confirmMonth/submitReject 이중 제출 방지 (isProcessing 플래그)
- vacationBalanceModel: create/update/delete/bulkCreate → sp_vacation_balances + balance_type 매핑

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/api/models/monthlyComparisonModel.js

@@ -36,7 +36,8 @@ const MonthlyComparisonModel = {
         dar.is_present,
         dar.notes,
         wat.type_name AS attendance_type_name,
-        vt.type_name AS vacation_type_name
+        vt.type_name AS vacation_type_name,
+        vt.deduct_days AS vacation_days
       FROM daily_attendance_records dar
       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
@@ -162,34 +163,56 @@ const MonthlyComparisonModel = {
     return rows.map(r => r.user_id);
   },
 
-  // 7. 엑셀용 전체 일별 상세
-  async getExcelData(year, month) {
+  // 7. 출근부 엑셀용 — 작업자 목록 + 일별 근태 + 연차잔액
+  async getExportData(year, month, departmentId) {
     const db = await getDb();
-    const [rows] = await db.query(`
-      SELECT
-        w.worker_name, d.department_name, w.job_type,
-        dar.record_date,
-        dar.total_work_hours AS attendance_hours,
-        wat.type_name AS attendance_type_name,
-        vt.type_name AS vacation_type_name,
-        COALESCE(wr.total_hours, 0) AS report_hours
+
+    // (a) 해당 부서 활성 작업자 (worker_id 순)
+    let workerSql = `
+      SELECT w.user_id, w.worker_id, w.worker_name, w.job_type,
+             COALESCE(d.department_name, '미배정') AS department_name
       FROM workers w
       LEFT JOIN departments d ON w.department_id = d.department_id
-      LEFT JOIN daily_attendance_records dar
-        ON w.user_id = dar.user_id
-        AND YEAR(dar.record_date) = ? AND MONTH(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
-      LEFT JOIN (
-        SELECT user_id, report_date, SUM(work_hours) AS total_hours
-        FROM daily_work_reports
-        WHERE YEAR(report_date) = ? AND MONTH(report_date) = ?
-        GROUP BY user_id, report_date
-      ) wr ON w.user_id = wr.user_id AND dar.record_date = wr.report_date
       WHERE w.status = 'active'
-      ORDER BY d.department_name, w.worker_name, dar.record_date
-    `, [year, month, year, month]);
-    return rows;
+    `;
+    const workerParams = [];
+    if (departmentId) { workerSql += ' AND w.department_id = ?'; workerParams.push(departmentId); }
+    workerSql += ' ORDER BY w.worker_id';
+    const [workers] = await db.query(workerSql, workerParams);
+
+    if (workers.length === 0) return { workers: [], attendance: [], vacations: [] };
+
+    const userIds = workers.map(w => w.user_id);
+    const placeholders = userIds.map(() => '?').join(',');
+
+    // (b) 일별 근태 기록
+    const [attendance] = await db.query(`
+      SELECT dar.user_id, dar.record_date,
+             dar.total_work_hours,
+             dar.attendance_type_id,
+             dar.vacation_type_id,
+             vt.type_code AS vacation_type_code,
+             vt.type_name AS vacation_type_name,
+             vt.deduct_days
+      FROM daily_attendance_records dar
+      LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
+      WHERE dar.user_id IN (${placeholders})
+        AND YEAR(dar.record_date) = ? AND MONTH(dar.record_date) = ?
+      ORDER BY dar.user_id, dar.record_date
+    `, [...userIds, year, month]);
+
+    // (c) 연차 잔액 (sp_vacation_balances)
+    const [vacations] = await db.query(`
+      SELECT svb.user_id,
+             SUM(svb.total_days) AS total_days,
+             SUM(svb.used_days) AS used_days,
+             SUM(svb.total_days - svb.used_days) AS remaining_days
+      FROM sp_vacation_balances svb
+      WHERE svb.user_id IN (${placeholders}) AND svb.year = ?
+      GROUP BY svb.user_id
+    `, [...userIds, year]);
+
+    return { workers, attendance, vacations };
   },
 
   // 8. 작업자 정보