Renamed the mariadb, openldap and postgres database

roles/svc-db-mariadb/defaults/README.md

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+# defaults/
+
+This directory contains default variable definition files for the `svc-db-mariadb` Ansible role. It centralizes all configurable values related to MariaDB deployment and can be adjusted without modifying task logic.
+
+---
+
+## files and their purpose
+
+### `main.yml`
+
+Defines default values for how the MariaDB database should be created.
+
+* **`database_encoding`** (string):
+
+  * **Default:** `"utf8mb4"`
+  * **Reasoning:**
+
+    * **Full Unicode support**: `utf8mb4` is the only MySQL/MariaDB character set that fully implements 4‑byte UTF‑8, allowing storage of emojis, supplementary symbols, and all global scripts without data loss.
+    * **Future‑proof:** Modern applications and standards have converged on UTF‑8; using `utf8mb4` avoids migration challenges later.
+    * **Performance trade‑off:** While slightly more storage might be used compared to `latin1`, the universality of `utf8mb4` outweighs the cost for most deployments.
+
+* **`database_collation`** (string):
+
+  * **Default:** `"utf8mb4_unicode_ci"`
+  * **Reasoning:**
+
+    * **Accurate sorting & comparison:** This collation uses full Unicode algorithm rules, ensuring linguistically correct comparisons across many languages.
+    * **Case‑insensitive (`ci`):** Most web apps expect case‑insensitive matching for usernames, emails, and search queries, improving usability.
+    * **Neutral choice:** Unlike language‑specific collations, `unicode_ci` works robustly in multilingual contexts without bias.
+
+> **Tip:** If you have a legacy application requiring a different charset or collation (e.g., for backward compatibility with existing data), simply override `database_encoding` and `database_collation` in your playbook-level variables.
+
+## Overriding default variables
+
+To customize any of these values without editing role defaults:
+
+1. Create or update a playbook-level vars file (e.g. `group_vars/all/svc-db-mariadb.yml`).
+2. Set the desired values, for example:
+
+   ```yaml
+   database_encoding: "latin1"
+   database_collation: "latin1_swedish_ci"
+   ```
+3. Run your playbook—Ansible’s variable precedence ensures your overrides take effect.

roles/svc-db-mariadb/defaults/main.yml

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+# Check out the README.md file for more information, why this encodings and collations are used
+database_encoding:  "utf8mb4"
+database_collation: "utf8mb4_unicode_ci"