Maybe it can help,

In the SYS.Database Class you can find the IsSystemDB(Directory) method that returns whether it is a system database.
It works on Caché and IRIS.

Documentation IsSystemDB - IRIS

Documentation IsSystemDB - Caché

Examples:

%SYS>set databaseDir = ##class(Config.Databases).Open("IRISLIB").Directory

%SYS>write ##class(SYS.Database).IsSystemDB(databaseDir)
1

%SYS>set databaseDir = ##class(Config.Databases).Open("CACHELIB").Directory

%SYS>write ##class(SYS.Database).IsSystemDB(databaseDir)
1

You can create User Events using the Security.Events class, with the Create method.

Example: