meldestelle/.junie/guidelines/project-standards/architecture-principles.md
StefanMo b35c4087a2
Fix: Test-Commit für VCS-Integration (MP-8) (#15)
* MP-8 OTHER Implementiere JWT-Authentifizierungs-Filter im Gateway

* Fix(ci): Update upload-artifact action to v4

* Fix(ci): Add start command for Keycloak and failure logs

* Fix(ci): Remove invalid 'command' property from Keycloak service

* Fix(ci): Use KC_DEV_MODE env var to start Keycloak

* Fix(ci): Keycloak service was removed from GitHub Actions services and replaced with a manual docker run step that starts Keycloak with the start-dev command.

* dev(ci): vereinheitliche Keycloak auf 26.4.2; aktiviere Health im CI (MP-8)

* Fix(ci): Stabilize Keycloak startup in integration tests via matrix

- Add `dev-file` Keycloak variant to matrix for stability fallback.
- Improve wait logic and health checks for Keycloak and Postgres.
- Unify Keycloak version to 26.4.2 across codebase.
- Add log dumps on failure.

* Fix(ci): Die betroffene Datei docs/Visionen-Ideen/Infrastruktur-Strategie_DSGVO-Konformität.md endet aktuell mit genau einer leeren Zeile (Zeile 87). Das entspricht der Regel MD047 („Files should end with a single newline character“). Damit ist deine Korrektur korrekt.

* Fix(ci): Repository-wide auto-fix for Markdown files was implemented with a GitHub Actions workflow and a local helper script. EditorConfig and markdownlint ignore files were added to ensure consistent formatting. Instructions for using the auto-fix both via GitHub Actions and locally were provided.

* fix(gradle): build.gradle.kts jsBrowser testTask disabled

* fix(gradle): build.gradle.kts jsBrowser testTask disabled

* Fix(ci): Stabilize integration tests with Keycloak matrix build (MP-8)

Introduces a matrix strategy (`keycloak_db: [postgres, dev-file]`)
in the integration-tests workflow to mitigate flaky Keycloak starts
when using the Postgres service container.

- Adds a `dev-file` Keycloak variant for stability fallback.
- Improves wait logic and health checks for Keycloak/Postgres.
- Unifies Keycloak version to 26.4.2 across codebase (Dockerfile, Compose,
  ADR, README, tests).
- Adds log dumps on failure in CI.
- Ensures `KC_HEALTH_ENABLED=true` is set.
- Updates related documentation (README, Schlachtplan).
- Includes broader Docker SSoT cleanup (versions.toml as source,
  script updates, env file cleanup, validator hardening).

This resolves recurring CI failures related to Keycloak startup and
ensures required checks for PRs (#15) are reliable, while also
improving overall Docker build consistency.

* feat(docs, ci): Implement YouTrack SSoT strategy with Dokka sync (MP-8)

- Add Dokka multi-module Gradle configuration and KDoc style guide.
- Add GitHub Actions workflow (docs-kdoc-sync.yml) and Python script
  (youtrack-sync-kb.py) to sync Dokka GFM output to YouTrack KB.
- Extend front-matter schema (bc, doc_type) and update relevant pages/stubs.
- Adapt CI scripts (validate-frontmatter, check-docs-drift, ci-docs link ignore).
- Update README.md to reference YouTrack KB.

* feat(docs, ci): Implement YouTrack SSoT strategy with Dokka sync (MP-8)

- Add Dokka multi-module Gradle configuration and KDoc style guide.
- Add GitHub Actions workflow (docs-kdoc-sync.yml) and Python script
  (youtrack-sync-kb.py) to sync Dokka GFM output to YouTrack KB.
- Extend front-matter schema (bc, doc_type) and update relevant pages/stubs.
- Adapt CI scripts (validate-frontmatter, check-docs-drift, ci-docs link ignore).
- Update README.md to reference YouTrack KB.

* Fix(ci): Replace OpenAPI validator with Spectral

Replaces the deprecated 'char0n/swagger-editor-validate' action,
which failed due to sandbox issues in GitHub Actions, with the
modern '@stoplight/spectral-cli'.

This ensures robust OpenAPI specification validation without
requiring a headless browser environment. The 'generate-api-docs'
job now depends on the successful completion of the Spectral validation.

Part of resolving CI failures for PR #15 (MP-8).

* Fix(ci): Specify spectral:oas ruleset for OpenAPI validation (MP-8)

* Fix(ci): Remove explicit ruleset argument for Spectral validation (MP-8)

* Fix(ci): Added a .spectral.yaml file to fix Spectral linting errors. Corrected markdown lint issues in two documentation files. Updated README.md with a new guidelines section to fix link validation errors.

* Fix(ci): Markdownlint errors were fixed by adding required blank lines. The Guidelines Validation error was resolved by updating the README.md link. The API Documentation Generator workflow was stabilized by updating paths, tasks, and validation steps.

* Fix(ci): Alle vier fehlerhaften GitHub-Action-Prüfungen wurden behoben. Fehler in der OpenAPI-Spezifikation, Probleme mit der Markdown-Linting-Analyse und Validierungsfehler bei Querverweisen wurden korrigiert. Die README.md enthält nun alle erforderlichen Links zu den Richtlinien.

* Fix(ci): Markdown linting errors in docs/api/README.md were fixed by specifying languages in fenced code blocks. OpenAPI specification errors in documentation.yaml were resolved by correcting example property types to strings. Cross-reference validation errors in README.md were fixed by adding the missing link to project-standards/coding-standards.md.

* Fix(ci): Duplicate heading errors in docs/api/members-api.md were fixed. Cross-reference validation errors for docker-architecture.md were resolved. All originally reported issues passed validation successfully.

* Fix(ci): The markdown heading levels in docs/api/members-api.md were corrected from h5 to h4 to fix linting errors. The missing cross-reference link from technology-guides/docker/docker-development.md to docker-overview.md was added. These fixes resolved the original validation and linting errors causing the process to fail.

* Fix(ci): Duplicate heading warnings in docs/api/members-api.md were resolved. Cross-reference validation for docker-development.md to docker-architecture.md was fixed. A new unrelated warning about docker-production.md was identified but not addressed.

* refactor(ci,docs): Simplify CI pipeline and migrate docs to YouTrack SSoT

BREAKING CHANGE: Documentation structure radically simplified

- Consolidate 9 GitHub Actions workflows into 1 main pipeline (ci-main.yml)
- Remove redundant workflows: ci-docs, markdownlint-autofix, guidelines-validation, api-docs
- Delete documentation migrated to YouTrack: api/, BCs/, Visionen-Ideen/, reference/, now/, overview/
- Keep only ADRs, C4 diagrams, and essential dev guides in repo
- Update README.md with YouTrack KB links
- Create new docs/README.md as documentation gateway
- Relax markdown-lint config for pragmatic developer experience

Kept workflows:
- ssot-guard.yml (Docker SSoT validation)
- docs-kdoc-sync.yml (KDoc → YouTrack sync)
- integration-tests.yml (Integration tests)
- deploy-proxmox.yml (Deployment)
- youtrack-sync.yml (YouTrack integration)

Related: MP-DOCS-001

* refactor(ci,docs): Simplify CI pipeline and migrate docs to YouTrack SSoT

BREAKING CHANGE: Documentation structure radically simplified

- Consolidate 9 GitHub Actions workflows into 1 main pipeline (ci-main.yml)
- Remove redundant workflows: ci-docs, markdownlint-autofix, guidelines-validation, api-docs
- Delete documentation migrated to YouTrack: api/, BCs/, Visionen-Ideen/, reference/, now/, overview/
- Keep only ADRs, C4 diagrams, and essential dev guides in repo
- Update README.md with YouTrack KB links
- Create new docs/README.md as documentation gateway
- Relax markdown-lint config for pragmatic developer experience

Kept workflows:
- ssot-guard.yml (Docker SSoT validation)
- docs-kdoc-sync.yml (KDoc → YouTrack sync)
- integration-tests.yml (Integration tests)
- deploy-proxmox.yml (Deployment)
- youtrack-sync.yml (YouTrack integration)

Related: MP-DOCS-001

* refactor(ci,docs): README.md und einige andere Dokumentationen überarbeitet.
ports-and-urls.md hinzugefügt.
Related: MP-DOCS-001

* refactor(ci,docs): Die Markdownlint-Fehler in README.md und docs/README.md wurden behoben, indem die Überschriftenebenen angepasst, überflüssige Satzzeichen am Ende entfernt und die notwendigen Leerzeilen um Überschriften, Listen, Tabellen und Codeblöcke eingefügt wurden. Das problematische Leerzeichen am Ende in docs/README.md wurde ebenfalls entfernt. Die Dateien entsprechen nun den vorgegebenen Markdownlint-Regeln und sollten die CI-Validierung bestehen.
Related: MP-DOCS-001

* refactor(ci,docs): Docker guideline cross-references were fixed and normalized to lowercase labels. Validation scripts confirmed zero cross-reference warnings and consistent metadata. Documentation was updated with a changelog and enhanced README navigation.
Related: MP-DOCS-001

* refactor(ci,docs): Docker guideline cross-references were fixed and normalized to lowercase labels. Validation scripts confirmed zero cross-reference warnings and consistent metadata. Documentation was updated with a changelog and enhanced README navigation.
Related: MP-DOCS-001

* refactor(ci,docs): Dead links in docs/architecture/adr were fixed by updating URLs to stable sources and adding an ignore pattern for a placeholder link. Specific ADR files had their broken links replaced with valid ones. The markdown-link-check GitHub Action is expected to pass with zero dead links now.
Related: MP-DOCS-001

* refactor(ci,docs): Links in ADR checked
Related: MP-DOCS-001

* refactor(ci,docs): Links in ADR checked
Related: MP-DOCS-001

* refactor(ci,docs): Markdown Regeln ausgebessert
Related: MP-DOCS-001

* refactor(ci,docs): Markdown Regeln ausgebessert
Related: MP-DOCS-001

* refactor(ci,docs): Markdown Regeln ausgebessert
Related: MP-DOCS-001

* Chore: Rerun CI checks with updated branch protection rules
2025-11-07 12:26:33 +01:00

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# Architecture Principles und Grundsätze
---
guideline_type: "project-standards"scope: "architecture-principles"
audience: ["developers", "architects", "ai-assistants"]
last_updated: "2025-09-15"
dependencies: ["master-guideline.md"]
related_files: ["build.gradle.kts", "settings.gradle.kts", "docker-compose.yml"]
ai_context: "Architektonische Grundlagen, Microservices-Pattern, DDD-Prinzipien, ereignisgesteuerte Architektur und Multiplatform-Strategie"
---
## 🏗️ Vision & architektonische Grundpfeiler
Dieses Dokument definiert die verbindlichen technischen Richtlinien und Qualitätsstandards für das Projekt "Meldestelle_Pro". Ziel ist die Schaffung einer modernen, skalierbaren und wartbaren Plattform für den Pferdesport.
> **🤖 AI-Assistant Hinweis:**
> Die Architektur basiert auf vier Kernsäulen:
> - **Microservices:** Modularität & Skalierbarkeit
> - **DDD:** Fachlichkeit im Code
> - **EDA:** Ereignisgesteuerte Entkopplung
> - **KMP:** Kotlin Multiplatform für Effizienz
### Die vier Säulen der Architektur
1. **Modularität & Skalierbarkeit** durch eine **Microservices-Architektur**
2. **Fachlichkeit im Code** durch **Domain-Driven Design (DDD)**
3. **Entkopplung & Resilienz** durch eine **ereignisgesteuerte Architektur (EDA)**
4. **Effizienz & Konsistenz** durch eine **Multiplattform-Client-Strategie (KMP)**
> **Grundsatz:** Jede Code-Änderung muss diese vier Grundprinzipien respektieren.
## 🎯 AI-Assistenten: Architektur-Schnellreferenz
### Architektur-Säulen im Detail
| Säule | Technologie | Zweck | Umsetzung |
|---------------|----------------------------|------------------------------|---------------------------------|
| Microservices | Spring Boot, Docker | Modularität & Skalierbarkeit | Service-per-Domain-Pattern |
| DDD | Kotlin, Clean Architecture | Fachlichkeit im Code | Bounded Contexts, Domain Events |
| EDA | Kafka, Events | Entkopplung & Resilienz | Asynchrone Kommunikation |
| KMP | Kotlin Multiplatform | Effizienz & Konsistenz | Shared Business Logic |
## 🔧 Backend-Entwicklungsrichtlinien
### Microservice-Struktur (Clean Architecture)
Jeder fachliche Microservice folgt der 4-Layer-Struktur (`api`, `application`, `domain`, `infrastructure`).
```plaintext
service-name/
├── service-name-api/ # REST-Endpoints, DTOs
├── service-name-application/ # Use Cases, Commands, Queries
├── service-name-domain/ # Domain Models, Events, Services
└── service-name-infrastructure/ # Repositories, External Services
```
#### Layer-Verantwortlichkeiten
**API Layer (`-api`):**
```kotlin
@RestController
@RequestMapping("/api/v1/members")
class MemberController(
private val memberService: MemberService
) {
@PostMapping
fun createMember(@RequestBody request: CreateMemberRequest): ResponseEntity<MemberResponse> {
val command = CreateMemberCommand(
name = request.name,
email = request.email,
licenseNumber = request.licenseNumber
)
return when (val result = memberService.createMember(command)) {
is Result.Success -> ResponseEntity.ok(result.value.toResponse())
is Result.Failure -> ResponseEntity.badRequest().body(result.error.toErrorResponse())
}
}
}
```
**Application Layer (`-application`):**
```kotlin
@Service
class MemberService(
private val memberRepository: MemberRepository,
private val eventPublisher: EventPublisher
) {
suspend fun createMember(command: CreateMemberCommand): Result<Member, BusinessError> {
// Validation
val validationResult = validateCreateMemberCommand(command)
if (validationResult is Result.Failure) {
return validationResult
}
// Business Logic
val member = Member.create(
name = command.name,
email = command.email,
licenseNumber = command.licenseNumber
)
// Persistence
return memberRepository.save(member).map {
// Event Publishing
eventPublisher.publish(MemberCreatedEvent(member))
member
}
}
}
```
**Domain Layer (`-domain`):**
```kotlin
@JvmInline
value class MemberId(val value: UUID) {
companion object {
fun generate(): MemberId = MemberId(UUID.randomUUID())
}
}
data class Member(
val id: MemberId,
val name: String,
val email: Email,
val licenseNumber: LicenseNumber,
val status: MemberStatus = MemberStatus.PENDING
) {
companion object {
fun create(
name: String,
email: String,
licenseNumber: String
): Result<Member, ValidationError> {
return Result.Success(
Member(
id = MemberId.generate(),
name = name,
email = Email.of(email).getOrThrow(),
licenseNumber = LicenseNumber.of(licenseNumber).getOrThrow()
)
)
}
}
fun activate(): Member = copy(status = MemberStatus.ACTIVE)
fun suspend(): Member = copy(status = MemberStatus.SUSPENDED)
}
```
**Infrastructure Layer (`-infrastructure`):**
```kotlin
@Repository
class PostgresMemberRepository(
private val jdbcTemplate: JdbcTemplate
) : MemberRepository {
override suspend fun save(member: Member): Result<Unit, RepositoryError> {
return try {
jdbcTemplate.update(
"INSERT INTO members (id, name, email, license_number, status) VALUES (?, ?, ?, ?, ?)",
member.id.value,
member.name,
member.email.value,
member.licenseNumber.value,
member.status.name
)
Result.Success(Unit)
} catch (e: DataAccessException) {
Result.Failure(RepositoryError.DATABASE_ERROR)
}
}
override suspend fun findById(id: MemberId): Result<Member?, RepositoryError> {
return try {
val member = jdbcTemplate.queryForObject(
"SELECT * FROM members WHERE id = ?",
arrayOf(id.value)
) { rs, _ ->
Member(
id = MemberId(UUID.fromString(rs.getString("id"))),
name = rs.getString("name"),
email = Email.of(rs.getString("email")).getOrThrow(),
licenseNumber = LicenseNumber.of(rs.getString("license_number")).getOrThrow(),
status = MemberStatus.valueOf(rs.getString("status"))
)
}
Result.Success(member)
} catch (e: EmptyResultDataAccessException) {
Result.Success(null)
} catch (e: DataAccessException) {
Result.Failure(RepositoryError.DATABASE_ERROR)
}
}
}
```
### Repository-Pattern
Jede Repository-Methode muss das `Result`-Pattern verwenden.
```kotlin
interface MemberRepository {
suspend fun findById(id: MemberId): Result<Member?, RepositoryError>
suspend fun save(member: Member): Result<Unit, RepositoryError>
suspend fun findByEmail(email: Email): Result<Member?, RepositoryError>
suspend fun findByLicenseNumber(licenseNumber: LicenseNumber): Result<Member?, RepositoryError>
suspend fun findAll(pageable: Pageable): Result<Page<Member>, RepositoryError>
}
```
### Messaging & Event-Naming
Event-Naming Convention: Domänen-Events folgen dem Muster `{Domain}{Entity}{Action}Event`.
```kotlin
data class MemberPersonalDataUpdatedEvent(
val memberId: MemberId,
val oldName: String,
val newName: String,
val oldEmail: Email,
val newEmail: Email,
val updatedAt: Instant = Instant.now(),
val correlationId: String = MDC.get("correlationId") ?: UUID.randomUUID().toString()
) : DomainEvent {
override val eventType: String = "member.personal-data.updated"
override val aggregateId: String = memberId.value.toString()
override val version: Int = 1
}
```
## 📱 Frontend-Entwicklungsrichtlinien
Das Frontend folgt konsequent dem **Model-View-ViewModel (MVVM)**-Muster und der **Kotlin Multiplatform (KMP)**-Strategie. Der UI-Code wird nach **fachlichen Features** (vertikale Schnitte) strukturiert.
### Multiplatform-Struktur
```plaintext
client/
├── src/commonMain/kotlin/ # Shared Business Logic
│ ├── domain/ # Domain Models
│ ├── data/ # Repositories, API-Clients
│ ├── presentation/ # ViewModels, UI-States
│ └── ui/ # Shared UI-Components
├── src/jvmMain/kotlin/ # Desktop-spezifischer Code
│ └── ui/ # Desktop UI-Adaptierungen
└── src/wasmJsMain/kotlin/ # Web-spezifischer Code
└── ui/ # Web UI-Adaptierungen
```
### MVVM-Implementation
**Shared ViewModel (commonMain):**
```kotlin
class MemberListViewModel(
private val memberRepository: MemberRepository
) : ViewModel() {
private val _uiState = MutableStateFlow(MemberListUiState())
val uiState: StateFlow<MemberListUiState> = _uiState.asStateFlow()
fun loadMembers() {
viewModelScope.launch {
_uiState.value = _uiState.value.copy(isLoading = true)
when (val result = memberRepository.getAllMembers()) {
is Result.Success -> {
_uiState.value = _uiState.value.copy(
isLoading = false,
members = result.value,
error = null
)
}
is Result.Failure -> {
_uiState.value = _uiState.value.copy(
isLoading = false,
error = result.error.message
)
}
}
}
}
}
data class MemberListUiState(
val isLoading: Boolean = false,
val members: List<Member> = emptyList(),
val error: String? = null
)
```
**Shared UI-Component (commonMain):**
```kotlin
@Composable
fun MemberListScreen(
viewModel: MemberListViewModel = viewModel()
) {
val uiState by viewModel.uiState.collectAsState()
LaunchedEffect(Unit) {
viewModel.loadMembers()
}
Column {
if (uiState.isLoading) {
CircularProgressIndicator()
}
uiState.error?.let { error ->
Text(
text = error,
color = MaterialTheme.colorScheme.error
)
}
LazyColumn {
items(uiState.members) { member ->
MemberCard(
member = member,
onMemberClick = { /* Handle click */ }
)
}
}
}
}
```
## 🎯 Domain-Driven Design (DDD) Patterns
### Bounded Contexts
```plaintext
Meldestelle-Domain/
├── member-context/ # Mitgliederverwaltung
├── tournament-context/ # Turnierverwaltung
├── horse-context/ # Pferdeverwaltung
├── registration-context/ # Anmeldungen
└── payment-context/ # Zahlungsabwicklung
```
### Aggregate Design
```kotlin
class Tournament private constructor(
val id: TournamentId,
val name: String,
val startDate: LocalDate,
val endDate: LocalDate,
val maxParticipants: Int,
private val registrations: MutableList<TournamentRegistration> = mutableListOf()
) {
companion object {
fun create(
name: String,
startDate: LocalDate,
endDate: LocalDate,
maxParticipants: Int
): Result<Tournament, ValidationError> {
// Business rules validation
if (startDate.isAfter(endDate)) {
return Result.Failure(ValidationError.INVALID_DATE_RANGE)
}
return Result.Success(
Tournament(
id = TournamentId.generate(),
name = name,
startDate = startDate,
endDate = endDate,
maxParticipants = maxParticipants
)
)
}
}
fun registerMember(memberId: MemberId): Result<TournamentRegistrationCreatedEvent, BusinessError> {
// Business rules
if (registrations.size >= maxParticipants) {
return Result.Failure(BusinessError.TOURNAMENT_FULL)
}
if (registrations.any { it.memberId == memberId }) {
return Result.Failure(BusinessError.ALREADY_REGISTERED)
}
val registration = TournamentRegistration(
id = TournamentRegistrationId.generate(),
tournamentId = id,
memberId = memberId,
registrationDate = LocalDateTime.now()
)
registrations.add(registration)
return Result.Success(
TournamentRegistrationCreatedEvent(
tournamentId = id,
memberId = memberId,
registrationId = registration.id
)
)
}
}
```
### Infrastructure & Betrieb
#### Kafka-Konfiguration
Die Konfiguration muss auf maximale Zuverlässigkeit ausgelegt sein:
```yaml
# application.yml
kafka:
producer:
acks: all
enable-idempotence: true
max-in-flight-requests-per-connection: 1
consumer:
group-id-prefix: "meldestelle-${spring.application.name}"
auto-offset-reset: earliest
enable-auto-commit: false
```
#### Datenbank-Migrationen (Flyway)
Migrations-Skripte müssen einer klaren Namenskonvention folgen:
* **Pattern:** `V{version}__{description}.sql` (z.B., `V001__Create_member_tables.sql`)
* **Repeatable:** `R__{description}.sql` (z.B., `R__Update_member_view.sql`)
#### API-Dokumentation (OpenAPI)
Alle öffentlichen REST-Endpunkte müssen mit OpenAPI-Annotationen (`@Operation`, `@ApiResponse`) dokumentiert werden, um eine klare und interaktive API-Dokumentation zu generieren.
```kotlin
@Operation(
summary = "Neues Mitglied erstellen",
description = "Erstellt ein neues Mitglied mit den angegebenen Daten"
)
@ApiResponses(
value = [
ApiResponse(
responseCode = "201",
description = "Mitglied erfolgreich erstellt"
),
ApiResponse(
responseCode = "400",
description = "Ungültige Eingabedaten"
)
]
)
@PostMapping
fun createMember(@RequestBody request: CreateMemberRequest): ResponseEntity<MemberResponse>
```
## 🚀 Architektur-Entscheidungen (ADRs)
### ADR-001: Microservices mit Domain-Driven Design
**Status:** Akzeptiert
**Kontext:** Skalierbare und wartbare Architektur für Pferdesport-Plattform
**Entscheidung:** Microservices-Architektur mit DDD-Bounded-Contexts
**Konsequenzen:**
- ✅ Unabhängige Entwicklung und Deployment
- ✅ Fachliche Kapselung durch Bounded Contexts
- ❌ Komplexität bei Service-zu-Service-Kommunikation
- ❌ Eventual Consistency zwischen Services
### ADR-002: Event-Driven Architecture mit Kafka
**Status:** Akzeptiert
**Kontext:** Entkopplung und Resilienz zwischen Services
**Entscheidung:** Kafka als zentraler Event-Broker
**Konsequenzen:**
- ✅ Lose Kopplung zwischen Services
- ✅ Audit-Log durch Event-Store
- ❌ Komplexität bei Event-Schema-Evolution
- ❌ Eventually Consistent State
### ADR-003: Kotlin Multiplatform für Client
**Status:** Akzeptiert
**Kontext:** Codesharing zwischen Desktop und Web
**Entscheidung:** KMP mit Compose Multiplatform
**Konsequenzen:**
- ✅ Geteilte Business-Logic
- ✅ Einheitliche UI-Patterns
- ❌ Plattform-spezifische Optimierungen schwieriger
- ❌ Abhängigkeit von Kotlin/JetBrains-Ökosystem
---
**Navigation:**
- [Master-Guideline](../master-guideline.md) - übergeordnete Projektrichtlinien
- [Coding-Standards](./coding-standards.md) - Code-Qualitätsstandards
- [Testing-Standards](./testing-standards.md) - Test-Qualitätssicherung
- [Documentation-Standards](./documentation-standards.md) - Dokumentationsrichtlinien