RH-SSO should clearly states/mention that  embedded DB is not supported in a production environment for TEMPLATE.

It is already mentioned for operator

11.2. Using the Red Hat Single Sign-On Operator in production environment

• The usage of embedded DB is not supported in a production environment.
• https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.6/html/server_installation_and_configuration_guide/operator#operator_production_usage

The same shall also be added to the RH-SSO documentation to be consistent.

Cf also KCS article:

Is RH-SSO (or RHBK) deployed on OpenShift using an Embedded PostgreSQL database Supported ?

https://access.redhat.com/solutions/7047836