Service binding is a feature that only large systems like Cloud Foundry support till now. Even Kubernetes does not have a functional implementation, the Red Hat operator is deprecated. It is a very useful feature, it allows you to configure a Postgres/MySQL service once and then each new app can easily bind and get a unique schema/database within the main database instance. Much simpler than the alternative of managing a separate database service for each app or sharing a service by either using same credentials or manually provisioning unique credentials.

I have been building the OpenRun https://github.com/openrundev/openrun project over the last three years. Recently added support for Postgres and MySQL service bindings. The flow is configure the admin credentials for your database service. After that, any new app can just ask for a binding and get a unique schema/database. Backups, monitoring, capacity planning etc can be done once for the main database, instead of repeating it for every new app.