Checkmate/Server/db/models/Notification.js

import mongoose from "mongoose";
const NotificationSchema = mongoose.Schema(
  {
    monitorId: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "Monitor",
      immutable: true,
    },
    type: {
      type: String,
      enum: ["email", "sms"],
    },
    address: {
      type: String,
    },
    phone: {
      type: String,
    },
  },
  {
    timestamps: true,
  }
);
export default mongoose.model("Notification", NotificationSchema);