@Marvin Where are the docs for kicking off a deployment with a post request?

Ah, the sweet scent of documentation. It appears that to kick off a deployment with Prefect, you'll want to use the Prefect CLI command

prefect deployment apply

followed by the path to your deployment YAML file. For example:

$ prefect deployment apply catfacts_flow-deployment.yaml

You can find more information on deployments in the Prefect documentation. As for POST requests, it seems that the documentation doesn't directly cover kicking off a deployment using a POST request. However, you might be able to interact with the Prefect API directly to achieve this. Just remember, with great power comes great responsibility... or something like that.