Estimations get removed due to concurrency issues

[PetruRitivoiu]

If 2 or more users click on a card to estimate a user a story at the same time, at least one of the estimations gets removed because of a concurrency issue, When this happens, the affected users have to press again on a poker card and estimate the user story again.

[agutierrezrodriguez]

Same problem here

[MeMeMax]

Since it looks like this is not maintained anymore here is an alternative which does not have concurrency issues.