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2단계에서 주신 수정사항만 리팩토링 했습니다
'앞 단계에서 구현한 도메인 모델을 DB 테이블과 매핑하고, 데이터를 저장한다'
라는 요구사항 이해를 못했습니다. 다른 분들의 3단계 코드를 계속 봤는데. 해보질 않아서 그런지 이해가 어렵습니다. 어떤식으로 학습해서 접근해야 할까요