e4f14a24b7404897149f615f04ea654c02d971bf
AttendanceAdmin sends ?year=YYYY&month=M (separate params), but the route handler assumed month was always in "YYYY-MM" format. When query.month was just "4", the split produced NaN for month and 4 for year, causing the service to skip the month filter entirely. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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