如何在express js server中删除超过24小时的mongoose文档？

const express = require('express');
const mongoose = require('mongoose');

const app = express();

// 连接到MongoDB数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log('MongoDB 连接成功'))
  .catch(err => console.log(err));

// 创建Mongoose模型
const Document = mongoose.model('Document', new mongoose.Schema({
  content: String,
  createdAt: { type: Date, default: Date.now }
}));

// 定时任务，每24小时执行一次
setInterval(async () => {
  try {
    // 计算24小时前的时间
    const twentyFourHoursAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);

    // 查找超过24小时的文档
    const documentsToDelete = await Document.find({ createdAt: { $lt: twentyFourHoursAgo } });

    // 删除文档
    await Document.deleteMany({ _id: { $in: documentsToDelete.map(doc => doc._id) } });

    console.log(`${documentsToDelete.length} 个文档已删除`);
  } catch (err) {
    console.log(err);
  }
}, 24 * 60 * 60 * 1000);

app.listen(3000, () => console.log('服务器已启动'));