I'd cost my third employer 45k€ in 30 minutes with a wrong database update, I went through all tables and recovered everything when I told him, he saw how anxious I was and just shrugged his shoulders told me the amount and I never wanted to fail like that again ....
Usually the one who screws up blames himself the most.
I agree with Mev-Rael Mitchel Pigsley it's better to build a system to prevent it from happening again.