You can do it with DDL trigger. DDL trigger can be created on server level and on database level, but each level has different events that fire the trigger. For example server level ddl trigger can be fired on new database creation, login modification, granting server level permissions etc'. Database level DDL trigger can be fired for table creation, user modification, when procedure that is altered etc'. In your case you can create a database level trigger for procedure creation and procedure modification:

Create trigger CheckTrigger

On database

For create_procedure, alter_procedure

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Adi