⚡ Background tasks and/or caching

[morrieinmaas]

Investigate and possibly prototype whether and how adding background tasks and/or caching can help improve the app.

On the one hand, we might want to see whether we have some operations that don't need to wait for the actual result of the operation (for instance writing to the ledger?). On the other hand, and in order to improve scalability, we might want to add caching requests (eg with Redis) because tasks are long running and are potentially plenty.

Really, justfood for thought for now.