Without looking at the code I’m guessing the problem is related to App Lab “stringifying” (or not) the array that you’re trying to save or load. Try experimenting with one or some combination of
JSON.stringify(list) on the way into the database
and/or
JSON.parse(records[i].completedStars) on the way back out.
I think I ran into this problem when I made this app: https://studio.code.org/projects/applab/E9gTMKV_ugNzhnQc5k4YMw/
Poke around in there to see what I did. Hope that helps,
–Baker