computer-playbook/roles/docker-central-database/vars/database.yml

database_instance:  "{{ 'central-' + database_type if applications[application_id].database.central_storage | bool else application_id }}"
database_host:      "{{ 'central-' + database_type if applications[application_id].database.central_storage | bool else 'database' }}"
database_name:      "{{ application_id }}"
database_username:  "{{ application_id }}"
database_port:      "{{ 3306 if database_type == 'mariadb' else 5432 }}"
database_env:       "{{docker_compose.directories.env}}{{database_type}}.env"

# Don't set application_id . It would conflict with central database logic