@kfindeisen The big picture is that sattle needs the exact exposure time and the boresight ra & dec to populate a cache that will later be used in ip_diffim.detectAndMeasure. That cache takes a small amount of time to populate, so we want to call it early in the pipeline execution process so we're not waiting on it later during detectAndMeasure. This call (to /visit_cache) doesn't return any data to pipelines.

(We have taken steps on the service side to make the service idempotent and able to ignore 189 duplicate requests.)

The big picture is that sattle needs the exact exposure time and the boresight ra & dec to populate a cache that will later be used in ip_diffim.detectAndMeasure. That cache takes a small amount of time to populate, so we want to call it early in the pipeline execution process so we're not waiting on it later during detectAndMeasure.

I think a comment to that effect would be helpful (though, again, factoring the code might make that unnecessary if the new code is self-descriptive enough).