Although many have asked simliar questions, I am still confused on the answer.

We have been building and testing processes for quite some time. We will be ready to deploy soon and we do not want our test data to be available in the workspace reports.

We have many old process instances. We can't use the Service Manager to delete them because they are not active. How can we remove these old process instances and their log entries?

I have read that it may be possible using SourceCode.K2Mng.K2Manager.DeleteProcessInstances. Does this only work for active instances or can we use this for old stuff as well?

I have also read that it may be possible by manually deleting entries from the database. Is this a feasible option? Are there instructions somewhere for this?

If the answers to all of these are no, is there some alternative way to make sure the data does not appear in the workspace? Perhaps some kind of archive feature?

I'd appreciate your help.