The database has had Query Change Notification for a while but to use it required a custom program. Such as Tim outlines on his blog https://oracle-base.com/articles/10g/dbms_change_notification_10gR2
Since SQLcl has Nashorn, now it can be integrated with a few lines of javascript to get notified when changes happen. The script is below and posted. The catch is QCN only works on Varchars and Numbers.