spike: credo-based mediator service with persistent storage (redis?)

[cvarjao]

• What database can we use? redis? postgres?
• aca-py plugin reference

[jleach]

@cvarjao Looks like Ariel has done most of, if not all, of what we need out of this ticket. Even so, after trolling through the code and seeing his client / server example, I don't think this would be overly complicated to implement. Ariel looking into publishing his simplified version, which is what we would like to use, next week.

We still need to address the WebSocket scalability issue but that's a problem for another ticket.

CC. @swcurran