[pddpro]

Bugs are a part of life and I think it's safe to say that we don't intentionally put Bugs on our code. Therefore, while your guilt is justified, I don't think you should let yourself be overwhelmed from it. The best thing you can do is to double, and triple check that you don't lose data because even if users face down-times, they'll be mostly fine. But the same thing can't be said for data loss.

Apart from ensuring that all parts of the code are covered via appropriate tests, and being responsive to the customers' complaints, there isn't much you can do.