Security 회원 가입 User Entity package com.example.security1.model; import jakarta.persistence.*; import lombok.Data; import org.hibernate.annotations.CreationTimestamp; import java.sql.Timestamp; @Entity @Data public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column private String username; @Column private String password; @Column private String email; @C..