In my software model, part of the system is of course a database. I could view it as a separate softwareSystem or perhaps just a container. Let’s say it’s:

db = softwareSystem "Database"
softwareSystem "My App" {
   -> db "Reads/writes data"
}

This is sufficient as far as my logical relationships are concerned. In my deployment diagram though, I want to highlight that I’m using a connection-pooling proxy, a hot-standby and an offsite backup. Is it possible to encompass all that in a deploymentEnvironment?

Doing something like this just renders the database as one blob without more details:

deploymentNode "Database service" {
    softwareSystemInstance db

    group "Multi-AZ" {
        deploymentNode "Postgres" {
            -> backup "Backup"
        }
        deploymentNode "Hot standby"
    }

    deploymentNode "Proxy"
}

Moving softwareSystemInstance db into deploymentNode "Postgres" includes that, but still omits the proxy and everything else.

I can’t seem to find a notation that would make My App point to Proxy and Proxy point to Postgres and include all those details, without also including a proxy in the system model, where it doesn’t seem to belong, because it’s a detail of a specific deployment.