A while back while working in a game company as one of those who could resurrect the server I was the in-house DB expert, this sounds a bit stricter but close to the philosophy we took during a company-wide winter break we had, we had shifts where someone was expected to be phone/text/email immediately responsive to error notifications coming out of the server, that person would then triage and, in the event they couldn't handle the issue, be able to pull in other folks as needed according to their availability - for instance if there was an issue with a data corruption I'd likely be pulled in.

Thankfully that never happened because while we were all quite respectful about each other's time due to the jurisdiction and industry we worked in none of us were eligible for OT even during stat holidays. Were that company within a more reasonable line of business I'd demand a setup like that and feel perfectly justified - and that's pretty much why I don't work in the games industry anymore.