$ curl -s -X POST localhost:8080/booking-record \
     -H 'Content-Type: application/json' \
     -d '{"startDate":"2026-05-10","endDate":"2026-05-01"}'

HTTP status: 400
Body: 

# Class-level @DateRangeValid, placed on the record's type declaration exactly as it would
# be on a class, is honoured the same way. The validator reads booking.startDate() /
# booking.endDate() (accessor methods) instead of getStartDate()/getEndDate().