How to enable all users notifications by default?

There are three notifications in a user's left menu in the "My Notifications" section:

Notify on Listing Activation        

Notify on Listing Expiration        

Notify on Contract Expiration

These options are set to "off" by default. If you want to change this, you need to open the file:

system/lib/users/User/UserDBManager.php

and find the line ~ 28:

DB::query("UPDATE ?w SET contract_id = ?n WHERE sid = ?n", "users", $user_contract_id, $user->getSID());

and insert the following code after it:

DB::query("INSERT INTO users_notifications VALUES(?n, '1', '1', '1')", $user->getSID());