added index.js new models

packages/app/src/server/models/index.js

@@ -18,4 +18,6 @@ module.exports = {
   GlobalNotificationSlackSetting: require('./GlobalNotificationSetting/GlobalNotificationSlackSetting'),
   ShareLink: require('./share-link'),
   SlackAppIntegration: require('./slack-app-integration'),
+  Notification: require('./notification'),
+  Activity: require('./activity'),
 };