How can I delete events under the Events tab in organize space

We recently completed a clean up project in our Tridion Docs 15.1 environment and now have more than 6 million items under the "View All Events". We would like to empty out the queue, we have tried API2.5, but it only allows me to delete one item at at time based on progress id. Is there an ISHRemote query to directly delete them from the database. Here is the query I am currently running to delete them.

eventClient.DeleteByProgressId(progressid, true, false);

TIA

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