1. Create a backend workflow, with a single parameter of the ‘type’ of the thing you want to delete. This workflow should have a single action, which is to delete the Thing passed in as the parameter value.
  2. Wherever it is you create the Thing you want to delete, in that same workflow schedule an API workflow to run 1 hour after the Curren date/time, passing in the newly created thing as the parameter value.

Thats it.

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