models initialization refactored, better dev experience as backend hmr is working

server/api/models/eventnotification.js

@@ -1,15 +1,9 @@
-const sequelize = require('./index').sequelize
-const { Model, DataTypes } = require('sequelize')
-
-class EventNotification extends Model {}
-
-EventNotification.init({
+module.exports = (sequelize, DataTypes) => 
+  sequelize.define('event_notification', {
   status: {
     type: DataTypes.ENUM,
     values: ['new', 'sent', 'error', 'sending'],
     defaultValue: 'new',
     index: true
   }
-}, { sequelize, modelName: 'event_notification' })
-
-module.exports = EventNotification
+})