src/main/java/com/example/myproject/entity/GroupMembers.java

package com.example.myproject.entity;

import javax.persistence.*;

@Entity
@Table(name = "group_members")
public class GroupMembers {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "relation_id")
    private Long relationId;

    @Column(name = "group_id", nullable = false)
    private Long groupId;

    @Column(name = "user_id", nullable = false)
    private Long userId;

    // Getters and Setters
    public Long getRelationId() {
        return relationId;
    }

    public void setRelationId(Long relationId) {
        this.relationId = relationId;
    }

    public Long getGroupId() {
        return groupId;
    }

    public void setGroupId(Long groupId) {
        this.groupId = groupId;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }
}