Database initialization

By default, Airflow will run database initialization routines (checking and/or creating the metadata schema and creating an admin user) on start-up. These are idempotent and can be run every time as the overhead is minimal. However, if these steps should be skipped, a running Airflow cluster can be patched with a resource like this to deactivate the initialization:

---
apiVersion: airflow.stackable.tech/v1alpha1
kind: AirflowCluster
metadata:
  name: airflow
spec:
  clusterConfig:
    databaseInitialization:
      enabled: false  (1)

1	Turn off the initialization routine by setting `databaseInitialization.enabled` to `false`

The field databaseInitialization.enabled is true by default to be backwards-compatible. A fresh Airflow cluster cannot be created with this field set to false as this results in missing metadata in the Airflow database.

Setting databaseInitialization.enabled to false is an unsupported operation as subsequent updates to a running Airflow cluster can result in broken behaviour due to inconsistent metadata. Only set databaseInitialization.enabled to false if you know what you are doing!