Archive outdated journal logs and documents. Add Postman Runbook structure and centralize API testing documentation. Update Flyway configuration for ping-service with service-specific schema history.

docs/05_Backend/Services/PingService_Reference.md

@@ -3,7 +3,7 @@ type: Reference
 status: ACTIVE
 owner: Backend Developer
 tags: [backend, service, reference, ping]
-last_update: 2026-03-15
+last_update: 2026-04-03
 ---
 
 # 🎯 Ping Service Reference
@@ -24,7 +24,7 @@ Der `ping-service` ist der **"Tracer Bullet"** (Leuchtspurgeschoss) der Meldeste
 *   **Framework:** Spring Boot 3.5.x (Spring MVC, Tomcat).
 *   **Sprache:** Kotlin 2.x (Coroutines für asynchrone Abläufe).
 *   **Datenbank:** PostgreSQL (via Spring Data JPA).
-*   **Migration:** Flyway.
+*   **Migration:** Flyway (mit service-spezifischer Historientabelle `flyway_schema_history_ping`).
 *   **Security:** OAuth2 Resource Server (JWT via Keycloak).
 *   **Resilience:** Resilience4j (Circuit Breaker).
 *   **API Contract:** KMP-Modul `:contracts:ping-api` (Shared Code mit Frontend).