Transaction guards have been introduced with Safe contracts version 1.3.0. They are used when there are restrictions on top of the
Transaction guards can make checks before and after a Safe transaction.
The check before a transaction can e.g. programmatically check all of the parameters of the respective transaction prior to execution.
This check after a transaction is called at the very end of the transaction execution and can be used to e.g. perform checks on the final state of the Safe.