Can I delete my SleepCloud data without losing data stored elsewhere?

I recently started using the app again about a week ago. Checking my SleepCloud data there’s a bunch of old entries from a few years back. I tried deleting a bunch manually but it was tedious and it was difficult to tell what year the entries were from. What I’d like to do is delete all the old info in there without losing the last week and a half of current entries. Or if that’s not possible can I wipe all the SleepCloud data completely so I can start fresh?