JPA의 PK 등록 전략 DB : MySQLpackage Study.Board.board;import jakarta.persistence.*;import lombok.AccessLevel;import lombok.Getter;import lombok.NoArgsConstructor;import lombok.ToString;import org.springframework.data.annotation.CreatedDate;import org.springframework.data.annotation.LastModifiedDate;import java.time.LocalDateTime;@Getter@Entity@ToString@NoArgsConstructor(access = AccessLevel.PROTECTE..