Looks like there was already a result in the database with the same testID. It won't allow an overwrite of the same ID. It's supposed to check for that, I'll look and see why it didn't. Maybe I turned that off at some point and didn't realize... Even with that check disabled it's extremely rare to conflict with other testID's.
It's like 36^9 combinations, but I have seen it before and you just confirmed it again. I'll make sure that's not an issue for you in the future.
1.0155996e+14 that's a lot of combinations. 1.3537087e+16 combinations if I switched to cAsE sEnSiTiVe
Better go buy a lottery ticket.