Huge role refactoring/cleanup. Other commits will propably follow. Because some bugs will exist. Still important for longrun and also for auto docs/help/slideshow generation

roles/service-rdbms-mariadb/vars/README.md

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+# vars/
+
+This directory contains variable definition files for the `service-rdbms-mariadb` Ansible role. It centralizes all configurable values related to MariaDB deployment and can be adjusted without modifying task logic.
+
+---
+
+## files and their purpose
+
+### 1. `configuration.yml`
+
+Contains configuration values that determine which Docker image version to use and what hostname the container will be registered under.
+
+* **`version`** (string):
+
+  * Default: `"latest"`
+  * The MariaDB image tag to pull (e.g. `10.6`, `10.11`, or `latest`).
+
+* **`hostname`** (string):
+
+  * Default: `"central-mariadb"`
+  * The container name and DNS alias within the `central_mariadb` network. Used by other services (like Moodle) to connect.
+
+> **Tip:** Pin to a specific minor version (e.g., `10.6.12`) in production to avoid breaking changes on rebuilds.
+
+---
+
+### 2. `main.yml`
+
+Minimal file defining the application identifier for the role.
+
+* **`application_id`** (string):
+
+  * Default: `"mariadb"`
+  * Logical name used in templates, notifications, or paths when multiple roles/services may coexist.

roles/service-rdbms-mariadb/vars/configuration.yml

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+version:  "latest"
+hostname: "central-mariadb"

roles/service-rdbms-mariadb/vars/main.yml

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+application_id: "mariadb"