Revert "Revert "NOISSUES 디버깅 이슈 부분 삭제""

This reverts commit 091b91c423c84d25f4b909e3c5f1ea8d77773980.
Revert "Revert "기타 코드 최적화""

This reverts commit 49095b1ab5f062c33017bfb47005441a25e511ae.
Revert "Revert "#7 insertAttendance 함수 삭제""

This reverts commit ebea54125f65f699f9c6bf5f09ab79efaa3291d8.