- Altered LeaveDays column to update its comment.
- Added BeginningLeaveCount column to track the number of leave occurrences.
- Added BeginningLeaveDays column to store the total days of leave carried over.
- Introduced a new column 'LeaveCount' of type int to the LeaveBeginnings table.
- Set default value to 0 and added a comment for clarity in Thai: "จำนวนครั้งที่ลาสะสม".