query the source control based on last change date

Also, instead of archiving streams or changing the owner, one recommendation is to organize the streams into relevant folders. A Project Admin may need to take an hour to go through the streams and come up with a folder structure which helps and is meaningful to the members/users. Once this done, it will make the loading of the Team Artifacts view faster in the rich clients, and also help members find the stream they may be looking for.

The ability to organize streams into folders was added in RTC 6.0.6.1.
For more information on this feature see:
https://jazz.net/pub/new-noteworthy/rtc/6.0.6/6.0.6/index.html#14