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

server/api/models/notification.js

@@ -1,10 +1,5 @@
-
-const sequelize = require('./index').sequelize
-const { Model, DataTypes } = require('sequelize')
-
-class Notification extends Model {}
-
-Notification.init({
+module.exports = (sequelize, DataTypes) => 
+  sequelize.define('notification', {
   filters: DataTypes.JSON,
   email: DataTypes.STRING,
   remove_code: DataTypes.STRING,
@@ -24,6 +19,4 @@ Notification.init({
     unique: true,
     fields: ['action', 'type']
   }]
-})
-
-module.exports = Notification
+})