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This attribute contains a relation to the active user instance (@User@). The active user contains the following attributes.

system.user.id (String)
system.user.Roles (List)
system.user.teams (List)
system.user.userName (String)
system.user.tenant (String)

These properties are extracted from the UserData object which is automatically filled from the Authentication from the Spring Security Authentication mechanism. See Runtime AuthenticationSecurityContext.
Do not modify these properties, because in every newly created session these will be extracted again from the Authentication object in the Spring SecurityContext.

For implementing an Authentication for the SecurityContext see Runtime Authentication.