The attached graph serves two purposes:
1) It provides several examples of using the API, including the first node which retrieves a list of all runs. If you add a filter to watch for status "R" (running), then you'd have a list of what is active.
2) this graph, as a whole will help you clean up historical runs (should you desire to do so).
To clean up schedules, please run the attached graph. You'll need to go into Graph -> Edit Parameters ->Run Parameters tab and populate the GlobalDays parameter - enter the number of days you want to keep the runs for - see screenshot below.
Please let us know if you have any questions / comments.