Assign Redis namespace number for services

Multiple services are using the same Redis instance deployed.

There is possibility for conflict between services with keys between different services. This could cause data leakge, corruption etc.

To prevent this we want different services to use different Redis namespaces (no. 0-15).

The infrastructure can assign the Redis database number for individual services to use so each service can just pull the assigned number.

This keeps a centralized view on the separation, lets us see when we have hit capacity (15) and means the service has less work to do to make sure they maintain a separation with one another.