It's 3AM and your service has gone down? You now have backups of all the infrastructure changes. Rollback to the most recently stable snapshot.
Infrastructure state is data. Changing your infrastructure is a set of SQL queries to perform that read or change the data.
Unlike IaC, IaSQL makes the relations between pieces of your infrastructure first-class citizens, enforcing type safety on the data and changes to it.
Most cloud backends already depend on a SQL database. Review changes to your IaSQL database using your backend's migration system, just like Infrastructure-as-Code.