text: const modelName = 'Participant';
  const mongoose = require('mongoose');
  const Schema = mongoose.Schema;
  const Types = Schema.Types;
  
  let schema = new Schema({
    name: { type: String, required: true },
    role: { type: String, required: true }
  });
  
  let model = mongoose.model(modelName, schema);
  
  module.exports = model;