David, each Value Stream is dependent on its Thing. So running a purge on a Thing, will only clear out that Thing.
There are 3 different purges available on the Thing - PurgeAllPropertyHistory, PurgePropertyHistory and PurgeSelectedPropertyHistory.
- PurgeAllPropertyHistory - purges all logged properties on the Thing
- PurgePropertyHistory - purges a property that is logged (you need to give the name of the property that is logged)
- PurgeSelectedPropertyHistory - purges a list of properties on the Thing (takes an Infotable input of the properties you want to purge)
With that being said, you need to give a start and end date or it won't purge/ delete your data.