Currently the product is not designed to function in this manner. The only supported way to delete the DLP events is thru the database administration page by date range or older than days.
You may submit a product enhancement request to suggest the feature be added to a future release by following the KB article below.
But I can't do anything through the db itself?
While you could go and start deleting from the db itself, it would not be a supported method.
The database administration options are currently the only supported way to purge the events.
So I shouldn't doing it...
Thank you for you answer