const mongoose = require( "mongoose" ); // PM2.5 = 2.10, PM10 = 5.30 const schema = new mongoose.Schema( { pm25: { type: Number, required: true }, pm10:{ type: Number, required: true }, sensor_name: {type: String} }, { timestamps: true } ); const Model = mongoose.model( "PMEntry", schema, ); module.exports = Model;