Limit negative balances

[lysogeny]

Allowing arbitrarily large negative balances can be problematic. It may be useful to introduce a limit beyond which the balance cannot go negative, like -5€.

[stapelberg]

There was discussion to remove negative balances altogether. Maybe just reverting the commit that introduced them is sufficient for that, and to make this issue moot, too.

[Merovius]

Personally, I would favor not having negative balances. It was a reasonable experiment, but to me, the fact that we ended with negative totals after the event means it failed, pretty much. The relatively small convenience of not having to top up when getting a drink doesn't outweigh the awkwardness of having to hunt down outstanding debt after the event.

[lysogeny]

There was also discussion to limit it to something small where losses would not be too severe.

Personally I would not be opposed to going back to strictly positive balances either.