classDiagram
    class Member {
        Long id
        String name
        String email
        LocalDateTime createdAt
    }

    class Board {
        Long id
        String subject
        String content
        LocalDateTime createdAt
    }

    class Comment {
        Long id
        String comment
        LocalDateTime createdAt
    }

    Member "1" --> "many" Board : writes
    Member "1" --> "many" Comment : writes
    Board  "1" --> "many" Comment : has