1302
Whoops
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If for example a client application is (accidentally) firing doubled requests to your API, you might get deadlocks in this case. Which is not bad per se, as you don't want to conform to that behaviour. But it might also happen if you have two client applications with updates to the same resource (patching different fields for example), in that case you're blocking one party so a retry mechanism in the client or server side might be a solution.
Just something we noticed a while ago when using transactions.