The built-in delayed delivery mechanism (based on FIFO queues) might impact costs

[mauroservienti]

When using the unrestricted delayed delivery support, under certain circumstances (e.g., very long delay), the transport continuously re-schedules the delayed message very 15 minutes. Every re-schedule operation is a transaction with SQS, which has a cost.

It's worth investing some time to evaluate if there are alternatives. E.g., the endpoint could be scheduling delayed deliveries using CloudWatch, which can be configured to trigger the delayed event by sending a message to a queue. More details in #244