Updates the attendance entry specified by attendanceId. Only the fields sent in the body are updated.
Overnight: When updating endTime to a time on the next calendar day (e.g. changing an open entry to close at 06:00 next day), send endTime = 06:00:00 and isOvernightShift = true. For overnight shifts, endTime cannot be later than 18:00; otherwise the API returns 400 with message "For overnight shifts, end time cannot be later than 18:00."
Same-day rule: When isOvernightShift is not set or is false, endTime must be after startTime (same calendar day). If you send an end time earlier than start time (e.g. 22:00 start and 06:00 end) without isOvernightShift = true, the API returns 400 with message "When isOvernightShift is not set, endTime must be after startTime. For shifts that end the next day, set isOvernightShift to true."