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Under rare conditions due to bad HTTP timing and so on a draft could be set at the exact same time from 2 unicorn workers. When this happened and all the stars aligned, one of the sets would win and the other would raise an error. This transparently handles the situation without adding any cost to the draft system. The alternative is to add a distributed mutex, tricky DB transaction or handle the error in the controller. However this seems like a reasonable way to work around a pretty big edge case. |
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