In russia they had to turn 100 rubles into 1 rouble

Re-basing currency. Basically the mint makes "old money" worthless overnight, and "new money" is printed that has value that is more realistic. You get a window to buy new money with old money, and then that's it. I have no idea how that happens with digital accounting, but would obviously need to be a thing too. Point being: it's possible for inflation to be so horribly mismanaged that you have to declare a do-over to fix it.

Zimbabwe is the current poster child for this, where trillion-dollar notes were exchanged for single-dollar amounts on their third attempt of re-basing. But other countries like Iceland have done this in the not too distant past.

I'll add that with the US dollar being a de-facto reserve currency just about everywhere, the %1 is in the same boat with the rest of us. So I wouldn't expect things to get that dire. It might get re-based eventually, but probably more of a "let's move the decimal point over because this looks stupid" kind of a thing.