Sound handy in a pinch, but never tell your boss about it.
This is the sort of thing that could save the day once in a while, but it could also get organizations in trouble as it requires a fairly deep insight into the underlying data and your implementation to ensure it's safe. If management starts to think that they can push poorly planned schema and business rule changes on a regular basis and wave a magic wand to "fix" it they are gonna blow their foot off. A feature that gives a PHB the idea their entitled to make bad/risky decisions is dangerous indeed.
For a 30 min window to work, you probably need to have a tested plan B on deck to handle the exceptions or cleanly shunt operations. Without that a 30min window is just someone whistling the Jeopardy theme in your ear while you try to improvise an unplanned fix as a tractor slowly rolls over you.
Biting the hand that feeds IT
