ClassMessage.java

package com.wavii.model;

import jakarta.persistence.*;
import lombok.*;

import java.time.LocalDateTime;
import java.util.UUID;

/**
 * Entidad que representa un mensaje de chat dentro de una matriculación de clase.
 * Permite la comunicación privada entre profesor y alumno.
 */
@Entity
@Table(name = "class_messages")
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class ClassMessage {

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

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "enrollment_id", nullable = false)
    private ClassEnrollment enrollment;

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "sender_id", nullable = false)
    private User sender;

    @Column(length = 1500, nullable = false)
    private String content;

    @Column(nullable = false, updatable = false)
    @Builder.Default
    private LocalDateTime createdAt = LocalDateTime.now();
}