[Spring] JPA Entity 설계 참고 : https://velog.io/@kangsan/%EC%A2%8B%EC%9D%80-Entity-%EB%A5%BC-%EC%84%A4%EA%B3%84%ED%95%98%EA%B8%B0-%EC%9C%84%ED%95%9C-%EA%B0%9C%EB%85%90%EB%93%A4 🌱Java | Spring 2023.04.16
