如何在django管理站点中保存管理模型功能时向用户发送通知

from django.db.models.signals import post_save
from django.dispatch import receiver
from django.contrib.auth.models import User
from .models import Notification

@receiver(post_save, sender=User)
def send_notification(sender, instance, created, **kwargs):
    if created:
        # 创建通知实例并保存
        notification = Notification(user=instance, title="欢迎加入", content="欢迎加入我们的网站！")
        notification.save()

from django.contrib import admin
from .models import Notification

@admin.register(Notification)
class NotificationAdmin(admin.ModelAdmin):
    list_display = ('user', 'title', 'content', 'read', 'time')
    list_filter = ('read',)
    search_fields = ('user__username', 'title', 'content')