Feature Request

Hello Team.

I've been playing a bit with OpenTelemetry demo and started to think if there is any specific reason why we don't have any database instance (apart from Feature Flag Store)? I believe the easiest way to introduce it would be to create new service which reads orders from queue (Kafka) and save them to Database (e.g. MySQL or MongoDB). Then there could be some additional function added to Accounting Service which reads data from DB and perform some calculation. This additional feature would create additional capabilities to emphasise how great project OpenTelemetry is.

What do you think about this idea?