zhangshun/mydreamjob-server/src/main/java/com/mydreamjob/messaging/ConversationMember.java

package com.mydreamjob.messaging;

import jakarta.persistence.*;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.time.LocalDateTime;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "conversation_members",
       uniqueConstraints = @UniqueConstraint(columnNames = {"conversation_id", "user_id"}))
public class ConversationMember {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "conversation_id", nullable = false)
    private Long conversationId;

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

    @Column(name = "joined_at", nullable = false)
    private LocalDateTime joinedAt;

    @PrePersist
    void prePersist() {
        if (joinedAt == null) joinedAt = LocalDateTime.now();
    }
}