sanket3280/code-execution

1const mongoose = require('mongoose');2 3const WorldChatMessageSchema = new mongoose.Schema({4  sender: { type: String, required: true },5  senderId: { type: String, required: true },6  content: { type: String },7  challenge: {8    title: String,9    link: String,10    description: String11  },12  createdAt: { type: Date, default: Date.now, index: { expires: 60 * 60 * 3 } } // 3 hours TTL13});14 15module.exports = mongoose.model('WorldChatMessage', WorldChatMessageSchema);