chore(ping-service, security): integrate centralized security module and enhance Ping-Service

- Replaced local `SecurityConfig` in `ping-service` with the shared `infrastructure:security` module. - Added `GlobalSecurityConfig` to standardize OAuth2, JWT validation, and CORS for all services. - Introduced new endpoints (`/ping/public`, `/ping/secure`) with role-based access control. - Updated database schema with Flyway migration (`V1__init_ping.sql`) and refactored persistence layer to align with the standardized approach (`createdAt` field). - Enhanced application configuration (`application.yaml`) to use shared security and Flyway settings.
2026-01-16 19:11:48 +01:00 · 2026-01-16 19:11:48 +01:00 · 05962487e7
commit 05962487e7
parent 9456f28562
14 changed files with 234 additions and 124 deletions
--- a/backend/infrastructure/gateway/src/main/resources/application.yaml
+++ b/backend/infrastructure/gateway/src/main/resources/application.yaml
@ -25,7 +25,12 @@ spring:
        response-timeout: 5s
      routes:
        - id: ping-service
-          uri: http://ping-service:8080
+          # Nutze lb:// wenn Service Discovery aktiv ist, sonst http://hostname:port
+          # Da wir Consul nutzen, ist lb://ping-service besser, aber für Tracer Bullet
+          # und direkte Docker-Kommunikation ist http://ping-service:8082 sicherer,
+          # falls Consul noch nicht 100% stabil ist.
+          # Wir nutzen hier den Docker Alias und den konfigurierten Port.
+          uri: http://ping-service:8082
          predicates:
            - Path=/api/ping/**
          filters:
@ -42,13 +47,12 @@ management:
        include: health,info,prometheus
  tracing:
    sampling:
-      probability: 1.0 # 100% der Requests tracen (für Dev/Test sinnvoll, in Prod reduzieren)
+      probability: 1.0
    propagation:
-      type: w3c # Standard W3C Trace Context (kompatibel mit OpenTelemetry)
+      type: w3c

-# Gateway-spezifische Einstellungen
 gateway:
  ratelimit:
-    enabled: false # Start: ausgeschaltet; zum Aktivieren default-filters plus RequestRateLimiter in YAML hinzufügen
+    enabled: false
    replenish-rate: 10
    burst-capacity: 20
--- a/backend/infrastructure/security/src/main/kotlin/at/mocode/infrastructure/security/GlobalSecurityConfig.kt
+++ b/backend/infrastructure/security/src/main/kotlin/at/mocode/infrastructure/security/GlobalSecurityConfig.kt
@ -0,0 +1,64 @@
+package at.mocode.infrastructure.security
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity
+import org.springframework.security.config.annotation.web.builders.HttpSecurity
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity
+import org.springframework.security.config.http.SessionCreationPolicy
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter
+import org.springframework.security.web.SecurityFilterChain
+import org.springframework.web.cors.CorsConfiguration
+import org.springframework.web.cors.CorsConfigurationSource
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource
+
+@Configuration
+@EnableWebSecurity
+@EnableMethodSecurity(prePostEnabled = true) // Erlaubt @PreAuthorize in Services/Controllern
+class GlobalSecurityConfig {
+
+    @Bean
+    fun filterChain(http: HttpSecurity): SecurityFilterChain {
+        http
+            .csrf { it.disable() } // CSRF nicht nötig für Stateless REST APIs
+            .cors { it.configurationSource(corsConfigurationSource()) }
+            .sessionManagement { it.sessionCreationPolicy(SessionCreationPolicy.STATELESS) }
+            .authorizeHttpRequests { auth ->
+                // Explizite Freigaben (Health, Info, Public Endpoints)
+                auth.requestMatchers("/actuator/**").permitAll()
+                auth.requestMatchers("/ping/public").permitAll()
+                auth.requestMatchers("/error").permitAll()
+
+                // Alles andere muss authentifiziert sein
+                auth.anyRequest().authenticated()
+            }
+            .oauth2ResourceServer { oauth2 ->
+                oauth2.jwt { jwt ->
+                    jwt.jwtAuthenticationConverter(jwtAuthenticationConverter())
+                }
+            }
+
+        return http.build()
+    }
+
+    @Bean
+    fun jwtAuthenticationConverter(): JwtAuthenticationConverter {
+        val converter = JwtAuthenticationConverter()
+        converter.setJwtGrantedAuthoritiesConverter(KeycloakRoleConverter())
+        return converter
+    }
+
+    @Bean
+    fun corsConfigurationSource(): CorsConfigurationSource {
+        val configuration = CorsConfiguration()
+        // Erlaube Frontend (localhost, docker host)
+        configuration.allowedOriginPatterns = listOf("*") // Für Dev; in Prod einschränken!
+        configuration.allowedMethods = listOf("GET", "POST", "PUT", "DELETE", "OPTIONS")
+        configuration.allowedHeaders = listOf("*")
+        configuration.allowCredentials = true
+
+        val source = UrlBasedCorsConfigurationSource()
+        source.registerCorsConfiguration("/**", configuration)
+        return source
+    }
+}
--- a/backend/infrastructure/security/src/main/kotlin/at/mocode/infrastructure/security/KeycloakRoleConverter.kt
+++ b/backend/infrastructure/security/src/main/kotlin/at/mocode/infrastructure/security/KeycloakRoleConverter.kt
@ -0,0 +1,40 @@
+package at.mocode.infrastructure.security
+
+import org.springframework.core.convert.converter.Converter
+import org.springframework.security.core.GrantedAuthority
+import org.springframework.security.core.authority.SimpleGrantedAuthority
+import org.springframework.security.oauth2.jwt.Jwt
+
+/**
+ * Konvertiert Keycloak-Rollen aus dem JWT (Realm Access & Resource Access)
+ * in Spring Security GrantedAuthorities.
+ *
+ * Erwartetes Format im Token:
+ * "realm_access": { "roles": ["admin", "user"] }
+ * "resource_access": { "my-client": { "roles": ["client-role"] } }
+ */
+class KeycloakRoleConverter : Converter<Jwt, Collection<GrantedAuthority>> {
+
+    override fun convert(jwt: Jwt): Collection<GrantedAuthority> {
+        val roles = mutableSetOf<String>()
+
+        // 1. Realm Roles extrahieren
+        val realmAccess = jwt.claims["realm_access"] as? Map<*, *>
+        if (realmAccess != null) {
+            (realmAccess["roles"] as? List<*>)?.forEach { role ->
+                if (role is String) {
+                    roles.add(role)
+                }
+            }
+        }
+
+        // 2. Resource (Client) Roles extrahieren
+        // Optional: Falls wir Client-spezifische Rollen brauchen.
+        // Hier mappen wir vorerst nur Realm-Rollen global.
+
+        // 3. Mapping zu GrantedAuthority (Prefix "ROLE_" ist Standard in Spring Security)
+        return roles.map { role ->
+            SimpleGrantedAuthority("ROLE_${role.uppercase()}")
+        }
+    }
+}
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/PingServiceApplication.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/PingServiceApplication.kt
@ -2,11 +2,13 @@ package at.mocode.ping

 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
+import org.springframework.context.annotation.ComponentScan
 import org.springframework.context.annotation.EnableAspectJAutoProxy

@SpringBootApplication
-// Scannt explizit alle Sub-Packages (infrastructure, application, domain)
@EnableAspectJAutoProxy
+// Scannt das eigene Service-Package UND das Security-Infrastruktur-Package
+@ComponentScan(basePackages = ["at.mocode.ping", "at.mocode.infrastructure.security"])
 class PingServiceApplication

 fun main(args: Array<String>) {
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/SecurityConfig.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/SecurityConfig.kt
@ -1,32 +0,0 @@
-package at.mocode.ping.infrastructure
-
-import org.springframework.context.annotation.Bean
-import org.springframework.context.annotation.Configuration
-import org.springframework.security.config.annotation.web.builders.HttpSecurity
-import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity
-import org.springframework.security.web.SecurityFilterChain
-
-@Configuration
-@EnableWebSecurity
-class SecurityConfig {
-
-    @Bean
-    fun filterChain(http: HttpSecurity): SecurityFilterChain {
-        http
-            .authorizeHttpRequests { auth ->
-                auth
-                    // Public endpoints
-                    .requestMatchers("/actuator/**").permitAll()
-                    .requestMatchers("/ping/simple", "/ping/enhanced", "/ping/health", "/ping/history").permitAll()
-                    // Secure endpoints
-                    .requestMatchers("/ping/secure").authenticated()
-                    // Default deny
-                    .anyRequest().authenticated()
-            }
-            .oauth2ResourceServer { oauth2 ->
-                oauth2.jwt { }
-            }
-
-        return http.build()
-    }
-}
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/PingJpaEntity.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/PingJpaEntity.kt
@ -6,18 +6,13 @@ import jakarta.persistence.Table
 import java.time.Instant
 import java.util.UUID

-/**
- * JPA Entity (Infrastructure Detail).
- * Spiegelt die Datenbank-Tabelle wider.
- * Nutzt java.util.UUID für JPA-Kompatibilität (bis Hibernate kotlin.uuid nativ unterstützt).
- */
@Entity
-@Table(name = "pings")
+@Table(name = "ping")
 class PingJpaEntity(
    @Id
    val id: UUID,
    val message: String,
-    val timestamp: Instant
+    val createdAt: Instant
 ) {
    // Default constructor for JPA
    protected constructor() : this(UUID.randomUUID(), "", Instant.now())
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/PingRepositoryAdapter.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/PingRepositoryAdapter.kt
@ -2,48 +2,41 @@ package at.mocode.ping.infrastructure.persistence

 import at.mocode.ping.domain.Ping
 import at.mocode.ping.domain.PingRepository
-import org.springframework.stereotype.Component
+import org.springframework.stereotype.Repository
 import kotlin.uuid.ExperimentalUuidApi
 import kotlin.uuid.Uuid
 import kotlin.uuid.toJavaUuid
 import kotlin.uuid.toKotlinUuid

-/**
- * Driven Adapter.
- * Implementiert den Domain-Port `PingRepository` mithilfe von Spring Data JPA.
- * Mappt zwischen Domain-Entity und JPA-Entity.
- */
-@Component
@OptIn(ExperimentalUuidApi::class)
+@Repository
 class PingRepositoryAdapter(
    private val jpaRepository: SpringDataPingRepository
 ) : PingRepository {

    override fun save(ping: Ping): Ping {
-        val jpaEntity = PingJpaEntity(
-            id = ping.id.toJavaUuid(),
-            message = ping.message,
-            timestamp = ping.timestamp
-        )
-        val saved = jpaRepository.save(jpaEntity)
-        return mapToDomain(saved)
+        val entity = ping.toEntity()
+        val savedEntity = jpaRepository.save(entity)
+        return savedEntity.toDomain()
    }

    override fun findAll(): List<Ping> {
-        return jpaRepository.findAll().map { mapToDomain(it) }
+        return jpaRepository.findAll().map { it.toDomain() }
    }

    override fun findById(id: Uuid): Ping? {
-        return jpaRepository.findById(id.toJavaUuid())
-            .map { mapToDomain(it) }
-            .orElse(null)
+        return jpaRepository.findById(id.toJavaUuid()).map { it.toDomain() }.orElse(null)
    }

-    private fun mapToDomain(entity: PingJpaEntity): Ping {
-        return Ping(
-            id = entity.id.toKotlinUuid(),
-            message = entity.message,
-            timestamp = entity.timestamp
-        )
-    }
+    private fun Ping.toEntity() = PingJpaEntity(
+        id = this.id.toJavaUuid(),
+        message = this.message,
+        createdAt = this.timestamp
+    )
+
+    private fun PingJpaEntity.toDomain() = Ping(
+        id = this.id.toKotlinUuid(),
+        message = this.message,
+        timestamp = this.createdAt
+    )
 }
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/SpringDataPingRepository.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/persistence/SpringDataPingRepository.kt
@ -1,8 +1,6 @@
 package at.mocode.ping.infrastructure.persistence

 import org.springframework.data.jpa.repository.JpaRepository
-import org.springframework.stereotype.Repository
 import java.util.UUID

-@Repository
 interface SpringDataPingRepository : JpaRepository<PingJpaEntity, UUID>
--- a/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/web/PingController.kt
+++ b/backend/services/ping/ping-service/src/main/kotlin/at/mocode/ping/infrastructure/web/PingController.kt
@ -7,6 +7,7 @@ import at.mocode.ping.api.PingResponse
 import at.mocode.ping.application.PingUseCase
 import io.github.resilience4j.circuitbreaker.annotation.CircuitBreaker
 import org.slf4j.LoggerFactory
+import org.springframework.security.access.prepost.PreAuthorize
 import org.springframework.web.bind.annotation.*
 import java.time.ZoneOffset
 import java.time.format.DateTimeFormatter
@ -32,14 +33,8 @@ class PingController(

    @GetMapping("/ping/simple")
    override suspend fun simplePing(): PingResponse {
-        // Ruft Use Case auf -> Speichert in DB
        val domainPing = pingUseCase.executePing("Simple Ping")
-
-        return PingResponse(
-            status = "pong",
-            timestamp = domainPing.timestamp.atOffset(ZoneOffset.UTC).format(formatter),
-            service = "ping-service"
-        )
+        return createResponse(domainPing, "pong")
    }

    @GetMapping("/ping/enhanced")
@ -53,9 +48,7 @@ class PingController(
            throw RuntimeException("Simulated service failure")
        }

-        // Use Case Aufruf
        val domainPing = pingUseCase.executePing("Enhanced Ping")
-
        val elapsedMs = (System.nanoTime() - start) / 1_000_000

        return EnhancedPingResponse(
@ -67,7 +60,29 @@ class PingController(
        )
    }

-    // Fallback muss public sein für Resilience4j Proxy
+    // Neue Endpunkte
+
+    @GetMapping("/ping/public")
+    override suspend fun publicPing(): PingResponse {
+        val domainPing = pingUseCase.executePing("Public Ping")
+        return createResponse(domainPing, "public-pong")
+    }
+
+    @GetMapping("/ping/secure")
+    @PreAuthorize("hasRole('MELD_USER') or hasRole('MELD_ADMIN')") // Beispiel-Rollen
+    override suspend fun securePing(): PingResponse {
+        val domainPing = pingUseCase.executePing("Secure Ping")
+        return createResponse(domainPing, "secure-pong")
+    }
+
+    // Helper
+    private fun createResponse(domainPing: at.mocode.ping.domain.Ping, status: String) = PingResponse(
+        status = status,
+        timestamp = domainPing.timestamp.atOffset(ZoneOffset.UTC).format(formatter),
+        service = "ping-service"
+    )
+
+    // Fallback
    fun fallbackPing(simulate: Boolean, ex: Exception): EnhancedPingResponse {
        logger.warn("Circuit breaker fallback triggered: {}", ex.message)
        return EnhancedPingResponse(
@ -89,7 +104,6 @@ class PingController(
        )
    }

-    // Zusätzlicher Endpunkt um die DB zu prüfen (History)
    @GetMapping("/ping/history")
    fun getHistory() = pingUseCase.getPingHistory().map {
        mapOf("id" to it.id.toString(), "message" to it.message, "time" to it.timestamp.toString())
--- a/backend/services/ping/ping-service/src/main/resources/application.yaml
+++ b/backend/services/ping/ping-service/src/main/resources/application.yaml
@ -8,27 +8,29 @@ spring:
  profiles:
    active: ${SPRING_PROFILES_ACTIVE:dev}

-#  datasource:
-#    url: ${SPRING_DATASOURCE_URL:jdbc:postgresql://localhost:5432/pg-meldestelle-db}
-#    username: ${SPRING_DATASOURCE_USERNAME:pg-user}
-#    password: ${SPRING_DATASOURCE_PASSWORD:pg-password}
-#    driver-class-name: org.postgresql.Driver
+  datasource:
+    url: ${SPRING_DATASOURCE_URL:jdbc:postgresql://localhost:5432/meldestelle}
+    username: ${SPRING_DATASOURCE_USERNAME:postgres}
+    password: ${SPRING_DATASOURCE_PASSWORD:postgres}
+    driver-class-name: org.postgresql.Driver

-#  # --- REDIS KONFIGURATION (NEU) ---
-#  data:
-#    redis:
-#      host: ${SPRING_DATA_REDIS_HOST:localhost}
-#      port: ${SPRING_DATA_REDIS_PORT:6379}
-#      password: ${SPRING_DATA_REDIS_PASSWORD:redis-password} # Leer lassen als Default
-#      # Optional: Timeouts für Stabilität
-#      connect-timeout: 5s
-#      timeout: 2s
+  jpa:
+    database-platform: org.hibernate.dialect.PostgreSQLDialect
+    hibernate:
+      ddl-auto: validate # Flyway kümmert sich um Schema!
+    open-in-view: false

-#  jpa:
-#    database-platform: org.hibernate.dialect.PostgreSQLDialect
-#    hibernate:
-#      ddl-auto: update
-#    open-in-view: false
+  flyway:
+    enabled: true
+    baseline-on-migrate: true
+
+  security:
+    oauth2:
+      resourceserver:
+        jwt:
+          # Keycloak URL (innerhalb Docker Netzwerk oder Localhost)
+          issuer-uri: ${KEYCLOAK_ISSUER_URI:http://localhost:9090/realms/meldestelle}
+          jwk-set-uri: ${KEYCLOAK_JWK_SET_URI:http://localhost:9090/realms/meldestelle/protocol/openid-connect/certs}

  cloud:
    consul:
@ -54,49 +56,29 @@ management:
      probes:
        enabled: true
  tracing:
-    # Disable tracing by default to avoid Zipkin connection errors
    enabled: ${TRACING_ENABLED:false}
    sampling:
      probability: ${TRACING_SAMPLING_PROBABILITY:0.1}
  zipkin:
    tracing:
-      # Only configure endpoint if tracing is explicitly enabled
      endpoint: ${ZIPKIN_TRACING_ENDPOINT:http://localhost:9411/api/v2/spans}
-      # Configure timeout and connection settings to handle missing Zipkin gracefully
      connect-timeout: 1s
      read-timeout: 5s

-# Resilience4j Circuit Breaker Configuration
 resilience4j:
  circuitbreaker:
    configs:
      default:
-        # Circuit breaker opens when the failure rate exceeds 50%
        failure-rate-threshold: 50
-        # Minimum number of calls to calculate the failure rate
        minimum-number-of-calls: 5
-        # Time to wait before transitioning from OPEN to HALF_OPEN
        wait-duration-in-open-state: 10s
-        # Number of calls in HALF_OPEN state before deciding to close/open
        permitted-number-of-calls-in-half-open-state: 3
-        # Sliding window size for calculating failure rate
        sliding-window-size: 10
-        # Type of sliding window (COUNT_BASED or TIME_BASED)
        sliding-window-type: COUNT_BASED
-        # Record exceptions that should be considered as failures
        record-exceptions:
          - java.lang.Exception
-        # Ignore certain exceptions (don't count as failures)
        ignore-exceptions:
          - java.lang.IllegalArgumentException
    instances:
      pingCircuitBreaker:
-        # Use default configuration
        base-config: default
-        # Override specific settings for this instance if needed
-        failure-rate-threshold: 60
-        minimum-number-of-calls: 4
-        wait-duration-in-open-state: 5s
-
-  # Metrics configuration removed to avoid property resolution warnings
-  # Use micrometer and actuator endpoints for metrics instead
--- a/backend/services/ping/ping-service/src/main/resources/db/migration/V1__init_ping.sql
+++ b/backend/services/ping/ping-service/src/main/resources/db/migration/V1__init_ping.sql
@ -0,0 +1,8 @@
+CREATE TABLE ping (
+    id UUID PRIMARY KEY,
+    message VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL
+);
+
+-- Index für schnelle Sortierung nach Zeit (wichtig für Sync später)
+CREATE INDEX idx_ping_created_at ON ping(created_at);
--- a/contracts/ping-api/src/commonMain/kotlin/at/mocode/ping/api/PingApi.kt
+++ b/contracts/ping-api/src/commonMain/kotlin/at/mocode/ping/api/PingApi.kt
@ -4,4 +4,8 @@ interface PingApi {
    suspend fun simplePing(): PingResponse
    suspend fun enhancedPing(simulate: Boolean = false): EnhancedPingResponse
    suspend fun healthCheck(): HealthResponse
+
+    // Neue Endpunkte für Security Hardening
+    suspend fun publicPing(): PingResponse
+    suspend fun securePing(): PingResponse
 }
--- a/docs/05_Backend/Services/PingService.md
+++ b/docs/05_Backend/Services/PingService.md
@ -0,0 +1,38 @@
+# Ping Service
+
+Der `ping-service` ist der "Tracer Bullet" Service für die Meldestelle-Architektur. Er dient als Blueprint für alle weiteren Microservices.
+
+## Verantwortlichkeit
+*   Technischer Durchstich (Frontend -> Gateway -> Service -> DB).
+*   Validierung der Infrastruktur (Security, Resilience, Observability).
+*   Referenzimplementierung für DDD, Hexagonal Architecture und KMP-Integration.
+
+## API Endpunkte
+
+| Methode | Pfad | Beschreibung | Auth |
+| :--- | :--- | :--- | :--- |
+| GET | `/ping/simple` | Einfacher Ping, speichert in DB | Public |
+| GET | `/ping/enhanced` | Ping mit Circuit Breaker Simulation | Public |
+| GET | `/ping/public` | Expliziter Public Endpoint | Public |
+| GET | `/ping/secure` | Geschützter Endpoint (benötigt Rolle) | **Secure** (MELD_USER) |
+| GET | `/ping/health` | Health Check | Public |
+| GET | `/ping/history` | Historie aller Pings | Public (Debug) |
+
+## Architektur
+Der Service folgt der Hexagonalen Architektur (Ports & Adapters):
+*   **Domain:** `at.mocode.ping.domain` (Pure Kotlin, keine Frameworks).
+*   **Application:** `at.mocode.ping.application` (Use Cases, Spring Service).
+*   **Infrastructure:** `at.mocode.ping.infrastructure` (Web, Persistence, Security).
+
+## Security
+*   Nutzt das zentrale Modul `backend:infrastructure:security`.
+*   OAuth2 Resource Server (JWT Validation via Keycloak).
+*   Rollen-Mapping: Keycloak Realm Roles -> Spring Security Authorities (`ROLE_...`).
+
+## Persistence
+*   Datenbank: PostgreSQL.
+*   Migration: Flyway (`V1__init_ping.sql`).
+*   ORM: Spring Data JPA (für Write Model).
+
+## Resilience
+*   Circuit Breaker: Resilience4j (für DB-Zugriffe und simulierte Fehler).
--- a/docs/05_Backend/TASK_2026_Q1_Infrastructure_Hardening.md
+++ b/docs/05_Backend/TASK_2026_Q1_Infrastructure_Hardening.md
@ -34,7 +34,7 @@ Dieses Modul wurde neu angelegt. Fülle es mit Leben.
    *   Implementiere OAuth2 Resource Server Support (JWT Validierung).
    *   Definiere globale CORS-Regeln (Frontend darf zugreifen).
 *   [ ] **Role Converter:**
-    *   Implementiere einen `KeycloakRoleConverter`, der die Rollen aus dem JWT (Realm/Resource Access) in Spring Security `GrantedAuthority` mappt.
+    *   Implementiere einen `KeycloakRoleConverter`, der die Rollen aus dem JWT (Realm/Resource Access) in Spring Security `GrantedAuthority` mapping.
 *   **Wichtig:** Achte auf Kompatibilität. Das Gateway nutzt WebFlux (Reactive), die Services nutzen WebMVC (Servlet). Falls nötig, trenne die Konfigurationen oder nutze `ConditionalOnWebApplication`.

 ### B. Persistence Layer (`backend/infrastructure/persistence`)
@ -46,7 +46,7 @@ Das Modul ist bereits konfiguriert.
    *   Nutze `JpaRepository` für Standard-CRUD-Operationen.

 ### C. Ping Service Hardening (`backend/services/ping/ping-service`)
-Mache den Service "Production Ready".
+Mache den Service "Production Ready."

 *   [ ] **Flyway:**
    *   Erstelle `src/main/resources/db/migration/V1__init_ping.sql`.