Weeks containing public holidays or Obon days are exempt from violation checks
⑤ Data storage & limits
All data is saved automatically in your browser's localStorage — nothing is sent to a server.
There is no hard limit on the number of students. The practical limit is your browser's storage capacity (typically 5–10 MB). Tens to over a hundred students can be stored without issue.
If you clear browser data or switch to a different PC, use "Copy link" to save each student's share URL as a backup.
"Export CSV" downloads the full-year work data as an Excel/Numbers-compatible file.