Sep 16 - Optimize code, part 1

legacy_attendance_service.py

@@ -30,6 +30,7 @@ import pymysql
 import pymysql.cursors
 
 from config import Config
+from utils.excel_safety import neutralize_unexpected_formulas
 
 try:
     import openpyxl
@@ -323,6 +324,7 @@ def build_legacy_export_workbook(rows):
     ws.freeze_panes = 'A2'
 
     buffer = io.BytesIO()
+    neutralize_unexpected_formulas(wb)  # formula-injection guard (utils/excel_safety.py)
     wb.save(buffer)
     buffer.seek(0)
     return buffer