text: import mongoose from 'mongoose';
  
  const { Schema } = mongoose;
  const { ObjectId } = mongoose.Types;
  
  const model = new Schema(
      {
          _id: {
              type: String,
              default: () => String(new ObjectId()),
          },
          userId: String,
      }, { strict: false },
  );
  
  module.exports = mongoose.model('Conversation', model, 'conversations');
  