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You can specify an expression in the Scheduler unit to fire events to a my.app table every second. To do it, we add a Tick unit to fire the request every time we need it. Then, connect it to the Scheduler unit through its in input port. Finally, we can send the events to Devo by connecting the Scheduler out output port to a Devo Sink unit.
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In the Tick unit properties, set the fields to transform in the Fields tab.
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You can try this flow by downloading this JSON file and uploading it to your domain using the Import option.