{"event_id":"evt-exam-reorder-001","aggregate_id":"exam-001","event_type":"exam.question_reordered","occurred_at":1784021868,"payload":{"examId":"exam-001","classId":"cls-001","examTitle":"期末数学考试","studentIds":["stu-exam-001","stu-exam-002"]},"metadata":{"schema_version":"v1"}}