Prepare to make absolute bank on maintenance charges when they can't debug what they built? That's what I'd be thinking!

That aside, there's an awful lot of unprofessional comments in this thread. Guys, this is just business: people are paying you money for your talent. Sometimes you just have to wallow in the muck, but at least you're paid to do it.

This is what I thought, too. Watch them dig a hole for themselves while you take a vacation. And then when they fail to debug the mess, charge them by the day for your expertise, because it’ll be necessary for untangling that mess.