Data engineering·Quality, tests and knowing it is wrong
the numbers were wrong from Tuesday 02:00 until someone noticed on Thursday afternoon, and that gap is the thing worth measuring.
Data downtime
Also calleddata incident window
The period during which data was missing, wrong or stale, measured from when it broke to when it was fixed. Naming it as downtime is the useful move: it makes detection time visible as a separate number from repair time, and detection time in data teams is routinely measured in days. Almost every investment in quality checks is an argument about reducing the first number.