Check out this thread:
For an immediate fix, go to Developer Tools / Actions and type in Recorder: Purge. That will allow you to do an immediate purge down to whatever number of days you prefer. Be sure to select “Repack” and turn on the slider to the right of that field.
That should get you through the update. Then I’d recommend following the advice in the thread I linked above to exclude entities you don’t need to keep. You can’t directly purge or exclude things from the long-term statistics tables, but you may not have to if you have plenty of room and performance isn’t an issue. If you need more information check out this thread: