Inside Lacinia, there's just a system of callbacks. Inside lacinia-pedestal, there's a specific implementation (coming) based on web sockets. Originally, I had hoped that subscriptions would just be a particular interceptor in the general chain, but that doesn't look too likely now.

Does the docs here https://lacinia.readthedocs.io/en/latest/subscriptions/index.html look like they could fit into Yada and SSE?