The user requirement in the tables illustrating the connection string have incorrect restrictions on the user a customer must use for an external database connection

• User must be a superuser who can create and delete databases.

This occurs in the row for "central.db.connectionString".

This occurs in the following tables:
https://docs.openshift.com/acs/4.6/installing/installing_ocp/install-central-config-options-ocp.html#central-settings_install-central-config-options-ocp

https://docs.openshift.com/acs/4.6/installing/installing_other/install-central-other.html#central-services-public-configuration-file-central_install-central-other

https://docs.openshift.com/acs/4.6/installing/installing_ocp/install-central-ocp.html#central-services-public-configuration-file-central_install-central-ocp

What that line should represent is something that encapsulates the following:

The user needs to have:

• Connection rights to the database.
• Usage and Create on the schema.
• Select, Insert, Update, and Delete on all tables in the schema.
• Usage on all sequences in the schema.