Part 2 of the issue is solved. I’m not sure why dragging/dropping the planned workouts onto their completed counterparts (as noted in Merging planned workout sessions with completed workouts - #14 by Velo-city) didn’t work the first few times that I tried, but they paired with each other on the most recent attempt. So, the duplication is gone. Now there is just the possible bug which is the loading of past events when importing a calendar.