Ran into this issue myself today. Similarly, didn't find a way to increase the timeout or adjust the gateway. However, did find this article that was published yesterday that provided a way to get my long-running stored procedure to run and I do not get the timeout error any longer. https://techcommunity.microsoft.com/t5/integrations-on-azure-blog/execute-a-long-running-sql-stored-procedure-in-azure-logic-app/ba-p/3068008