NotificationTemplate.java
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package com.ecommerce.notification.model;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.*;
import java.time.LocalDateTime;
@Data
@NoArgsConstructor
@Entity
@Table(name = "notification_templates")
public class NotificationTemplate {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    @Column(name = "name", unique = true, nullable = false)
    private String name;
    
    @Column(name = "type", nullable = false)
    private String type; // EMAIL, SMS, PUSH
    
    @Column(name = "channel", nullable = false)
    private String channel; // ORDER, PAYMENT, SHIPPING, PROMOTION, SYSTEM
    
    @Column(name = "subject")
    private String subject;
    
    @Column(name = "content", columnDefinition = "TEXT", nullable = false)
    private String content;
    
    @Column(name = "variables", columnDefinition = "TEXT")
    private String variables; // JSON array of variable names
    
    @Column(name = "is_active")
    private Boolean isActive = true;
    
    @Column(name = "description")
    private String description;
    
    @Column(name = "created_at")
    private LocalDateTime createdAt;
    
    @Column(name = "updated_at")
    private LocalDateTime updatedAt;
    
    @PrePersist
    protected void onCreate() {
        createdAt = LocalDateTime.now();
        updatedAt = LocalDateTime.now();
    }
    
    @PreUpdate
    protected void onUpdate() {
        updatedAt = LocalDateTime.now();
    }
}