# Learnings — Club Work Manager

_Conventions, patterns, and accumulated wisdom from task execution_

---

## Task 1: Monorepo Scaffolding (2026-03-03)

### Key Learnings

1. **.NET 10 Solution Format Change**
   - .NET 10 uses `.slnx` format (not `.sln`)
   - Solution files are still named `WorkClub.slnx`, compatible with `dotnet sln add`
   - Both formats work seamlessly with build system

2. **Clean Architecture Implementation**
   - Successfully established layered architecture with proper dependencies
   - Api → (Application + Infrastructure) → Domain
   - Tests reference all layers for comprehensive coverage
   - Project references added via `dotnet add reference`

3. **NuGet Package Versioning**
   - Finbuckle.MultiTenant: Specified 8.2.0 but .NET 10 SDK resolved to 9.0.0
   - This is expected behavior with `rollForward: latestFeature` in global.json
   - No build failures - warnings only about version resolution
   - Testcontainers brings in BouncyCastle which has known security advisories (expected in test dependencies)

4. **Git Configuration for Automation**
   - Set `user.email` and `user.name` before commit for CI/CD compatibility
   - Environment variables like `GIT_EDITOR=:` suppress interactive prompts
   - Initial commit includes .sisyphus directory (plans, notepads, etc.)

5. **Build Verification**
   - `dotnet build --configuration Release` works perfectly
   - 6 projects compile successfully in 4.64 seconds
   - Only NuGet warnings (non-fatal)
   - All DLLs generated in correct bin/Release/net10.0 directories

### Configuration Files Created

- **.gitignore**: Comprehensive coverage for:
  - .NET: bin/, obj/, *.user, .vs/
  - Node: node_modules/, .next/, .cache/
  - IDE: .idea/, .vscode/, *.swp
  
- **.editorconfig**: C# conventions with:
  - 4-space indentation for .cs files
  - PascalCase for public members, camelCase for private
  - Proper formatting rules for switch, new line placement
  
- **global.json**: SDK pinning with latestFeature rollForward for flexibility

### Project Template Choices

- Api: `dotnet new webapi` (includes Program.cs, appsettings.json, Controllers template)
- Application/Domain/Infrastructure: `dotnet new classlib` (clean base)
- Tests: `dotnet new xunit` (modern testing framework, includes base dependencies)

### Next Phase Considerations

- Generated Program.cs in Api should be minimized initially (scaffolding only, no business logic yet)
- Class1.cs stubs exist in library projects (to be removed in domain/entity creation phase)
- No Program.cs modifications yet - pure scaffolding as required

---

## Task 2: Docker Compose with PostgreSQL 16 & Keycloak 26.x (2026-03-03)

### Key Learnings

1. **Docker Compose v3.9 for Development**
   - Uses explicit `app-network` bridge for service discovery
   - Keycloak service depends on postgres with `condition: service_healthy` for ordered startup
   - Health checks critical: PostgreSQL uses `pg_isready`, Keycloak uses `/health/ready` endpoint

2. **PostgreSQL 16 Alpine Configuration**
   - Alpine image reduces footprint significantly vs full PostgreSQL images
   - Multi-database setup: separate databases for application (`workclub`) and Keycloak (`keycloak`)
   - Init script (`init.sql`) executed automatically on first run via volume mount to `/docker-entrypoint-initdb.d`
   - Default PostgreSQL connection isolation: `read_committed` with max 200 connections configured

3. **Keycloak 26.x Setup**
   - Image: `quay.io/keycloak/keycloak:26.1` from Red Hat's container registry
   - Command: `start-dev --import-realm` (development mode with automatic realm import)
   - Realm import directory: `/opt/keycloak/data/import` mounted from `./infra/keycloak`
   - Database credentials: separate `keycloak` user with `keycloakpass` (not production-safe, dev only)
   - Health check uses curl to `/health/ready` endpoint (startup probe: 30s initial wait, 30 retries)

4. **Volume Management**
   - Named volume `postgres-data` for persistent PostgreSQL storage
   - Bind mount `./infra/keycloak` to `/opt/keycloak/data/import` for realm configuration
   - Bind mount `./infra/postgres` to `/docker-entrypoint-initdb.d` for database initialization

5. **Service Discovery & Networking**
   - All services on `app-network` bridge network
   - Service names act as hostnames: `postgres:5432` for PostgreSQL, `localhost:8080` for Keycloak UI
   - JDBC connection string in Keycloak: `jdbc:postgresql://postgres:5432/keycloak`

6. **Development vs Production**
   - This configuration is dev-only: hardcoded credentials, start-dev mode, default admin user
   - Security note: Keycloak admin credentials (admin/admin) and PostgreSQL passwords visible in plain text
   - No TLS/HTTPS, no resource limits, no restart policies beyond defaults
   - Future: Task 22 will add backend/frontend services to this compose file

### Configuration Files Created

- **docker-compose.yml**: 68 lines, v3.9 format with postgres + keycloak services
- **infra/postgres/init.sql**: Database initialization for workclub and keycloak databases
- **infra/keycloak/realm-export.json**: Placeholder realm (will be populated by Task 3)

### Environment Constraints

- Docker Compose CLI plugin not available in development environment
- Configuration validated against v3.9 spec structure
- YAML syntax verified via grep pattern matching
- Full integration testing deferred to actual Docker deployment

### Patterns & Conventions

- Use Alpine Linux images for smaller container footprints
- Health checks with appropriate startup periods and retry counts
- Ordered service startup via `depends_on` with health conditions
- Named volumes for persistent state, bind mounts for configuration
- Separate database users and passwords even in development (easier to migrate to secure configs)

### Gotchas to Avoid

- Keycloak startup takes 20-30 seconds even in dev mode (don't reduce retries)
- `/health/ready` is not the same as `/health/live` (use ready for startup confirmation)
- PostgreSQL in Alpine doesn't include common extensions by default (not needed yet)
- Keycloak password encoding: stored hashed in PostgreSQL, admin creds only in environment
- Missing realm-export.json or empty directory causes Keycloak to start but import silently fails

### Next Dependencies

- Task 3: Populate `realm-export.json` with actual Keycloak realm configuration
- Task 7: PostgreSQL migrations for Entity Framework Core
- Task 22: Add backend (Api, Application, Infrastructure services) and frontend to compose file

---

## Task 4: Domain Entities & State Machine (2026-03-03)

### Key Learnings

1. **TDD Approach Workflow**
   - Write tests FIRST (even when entities don't exist — LSP errors expected)
   - Create minimal entities to satisfy test requirements
   - All 12 tests passed on first run after implementation
   - This validates clean state machine design

2. **State Machine with C# 14 Switch Expressions**
   - Pattern matching for tuple of (currentStatus, newStatus) is cleaner than if-else chains
   - Expressions vs. traditional switch: more functional, concise, easier to verify all transitions
   - Chosen over Dictionary<(status, status), bool> because:
     - Easier to read and maintain
     - Compiler can verify exhaustiveness (with `_ => false` fallback)
     - No runtime lookup overhead
     - Clear inline state diagram

3. **Entity Design Patterns (Domain-Driven Design)**
   - All entities use `required` properties:
     - Enforces non-null values at compile time
     - Forces explicit initialization (no accidental defaults)
     - Clean validation at instantiation
   - `TenantId` is `string` (matches Finbuckle.MultiTenant.ITenantInfo.Id type)
   - Foreign keys use explicit `Guid` or `Guid?` (not navigation properties yet)
   - `RowVersion: byte[]?` for optimistic concurrency (EF Core `[Timestamp]` attribute in Task 7)

4. **DateTimeOffset vs DateTime**
   - Used DateTimeOffset for CreatedAt/UpdatedAt (includes timezone offset)
   - Better for multi-tenant global apps (know exact UTC moment)
   - .NET 10 standard for timestamp columns
   - Avoids timezone confusion across regions

5. **ITenantEntity Interface Pattern**
   - Explicit interface property (not EF shadow property) allows:
     - Easy data seeding in tests
     - LINQ queries without special knowledge
     - Clear contract in domain code
   - Marker interface only (no methods) — true DDD boundary

6. **Entity Lifecycle Simplicity**
   - No domain events (YAGNI for MVP)
   - No navigation properties (deferred to EF configuration in Task 7)
   - No validation attributes — EF Fluent API handles in Task 7
   - State machine is only behavior (business rule enforcement)

7. **Test Structure for TDD**
   - Helper factory method `CreateWorkItem()` reduces repetition
   - AAA pattern (Arrange-Act-Assert) clear in test names
   - Arrange: Create entity with minimal valid state
   - Act: Call transition method
   - Assert: Verify state changed or exception thrown
   - xUnit [Fact] attributes sufficient (no [Theory] needed for now)

8. **Project Structure Observations**
   - Projects in `backend/` root, not `backend/src/` (deviation from typical convention but works)
   - Subdirectories: Entities/, Enums/, Interfaces/ (clean separation)
   - Test mirrors source structure: Domain tests in dedicated folder
   - Class1.cs stub removed before implementation

### Files Created

- `WorkClub.Domain/Enums/SportType.cs` — 5 values
- `WorkClub.Domain/Enums/ClubRole.cs` — 4 values  
- `WorkClub.Domain/Enums/WorkItemStatus.cs` — 5 values
- `WorkClub.Domain/Interfaces/ITenantEntity.cs` — Marker interface
- `WorkClub.Domain/Entities/Club.cs` — Basic aggregate root
- `WorkClub.Domain/Entities/Member.cs` — User representation
- `WorkClub.Domain/Entities/WorkItem.cs` — Task with state machine
- `WorkClub.Domain/Entities/Shift.cs` — Volunteer shift
- `WorkClub.Domain/Entities/ShiftSignup.cs` — Shift registration
- `WorkClub.Tests.Unit/Domain/WorkItemStatusTests.cs` — 12 tests, all passing

### Build & Test Results

- **Tests**: 12/12 passed (100%)
  - 5 valid transition tests ✓
  - 5 invalid transition tests ✓  
  - 2 CanTransitionTo() method tests ✓
- **Build**: Release configuration successful
- **Warnings**: Only Finbuckle version resolution (expected, no errors)

### Next Steps (Tasks 5-7)

- Task 5: Next.js frontend (parallel)
- Task 6: Kustomize deployment (parallel)
- Task 7: EF Core DbContext with Fluent API configuration (blocks on these entities)
  - Add [Timestamp] attribute to RowVersion properties
  - Configure ITenantEntity filtering in DbContext
  - Set up relationships between entities
  - Configure PostgreSQL xmin concurrency token


---

## Task 6: Kubernetes Kustomize Base Manifests (2026-03-03)

### Key Learnings

1. **Kustomize vs Helm Trade-offs**
   - Kustomize chosen: lightweight, YAML-native, no templating language
   - Base + overlays pattern: separate environment-specific config from base
   - Base manifests use placeholders for image tags (`:latest`), resource limits (100m/256Mi requests)
   - Environment overlays (dev, staging, prod) override via patches/replacements

2. **Kubernetes Resource Naming & Labeling**
   - Consistent `workclub-` prefix across all resources (Deployments, Services, ConfigMaps, StatefulSets, Ingress)
   - Labels for resource tracking: `app: workclub-api`, `component: backend|frontend|auth|database`
   - Service selectors must match Pod template labels exactly
   - DNS service names within cluster: `serviceName:port` (e.g., `workclub-api:80`)

3. **.NET Health Probes (ASP.NET Core Health Checks)**
   - Three distinct probes with different semantics:
     - `startupProbe` (/health/startup): Initial boot, longer timeout (30s retries), prevents traffic until app fully initialized
     - `livenessProbe` (/health/live): Periodic health (15s), restart pod if fails continuously (3 failures)
     - `readinessProbe` (/health/ready): Pre-request check (10s), removes pod from service on failure (2 failures)
   - Startup probe MUST complete before liveness/readiness are checked
   - All three probes return `200 OK` for healthy status

4. **StatefulSet + Headless Service Pattern**
   - StatefulSet requires `serviceName` pointing to headless service (clusterIP: None)
   - Headless service enables stable network identity: `pod-0.serviceName.namespace.svc.cluster.local`
   - Primary service (ClusterIP) for general pod connections
   - Volume claim templates: each pod gets its own PVC (e.g., `postgres-data-workclub-postgres-0`)
   - Init container scripts via ConfigMap mount to `/docker-entrypoint-initdb.d`

5. **PostgreSQL StatefulSet Configuration**
   - Image: `postgres:16-alpine` (lightweight, 150MB vs 400MB+)
   - Health check: `pg_isready -U app -d workclub` (simple, fast, reliable)
   - Data persistence: volumeClaimTemplate with 10Gi storage, `standard` storageClassName (overrideable in overlay)
   - Init script creates both `workclub` (app) and `keycloak` databases + users in single ConfigMap

6. **Keycloak 26.x Production Mode**
   - Image: `quay.io/keycloak/keycloak:26.1` (Red Hat official registry)
   - Command: `start` (production mode, not `start-dev`)
   - Database: PostgreSQL via `KC_DB=postgres` + `KC_DB_URL_HOST=workclub-postgres`
   - Probes: `/health/ready` (readiness), `/health/live` (liveness)
   - Hostname: `KC_HOSTNAME_STRICT=false` in dev (allows any Host header)
   - Proxy: `KC_PROXY=edge` for behind reverse proxy (Ingress)

7. **Ingress Path-Based Routing**
   - Single ingress rule: `workclub-ingress` with path-based routing
   - Frontend: path `/` → `workclub-frontend:80` (pathType: Prefix)
   - Backend: path `/api` → `workclub-api:80` (pathType: Prefix)
   - Host: `localhost` (overrideable per environment)
   - TLS: deferred to production overlay (cert-manager, letsencrypt)

8. **ConfigMap Strategy for Non-Sensitive Configuration**
   - Central `workclub-config` ConfigMap:
     - `log-level: Information`
     - `cors-origins: http://localhost:3000`
     - `api-base-url: http://workclub-api`
     - `keycloak-url: http://workclub-keycloak`
     - `keycloak-realm: workclub`
     - Database host/port/name
   - Sensitive values (passwords, connection strings) → Secrets (not in base)
   - Environment-specific overrides in dev/prod overlays (CORS_ORIGINS changes)

9. **Resource Requests & Limits Pattern**
   - Base uses uniform placeholders (all services: 100m/256Mi requests, 500m/512Mi limits)
   - Environment overlays replace via patch (e.g., prod: 500m/2Gi)
   - Prevents resource contention in shared clusters
   - Allows gradual scaling experiments without manifests changes

10. **Image Tag Strategy**
    - Base: `:latest` placeholder for all app images
    - Registry: uses default Docker Hub (no registry prefix)
    - Overlay patch: environment-specific tags (`:v1.2.3`, `:latest-dev`, `:sha-abc123`)
    - Image pull policy: `IfNotPresent` (caching optimization for stable envs)

### Architecture Decisions

- **Why Kustomize over Helm**: Plan explicitly avoids Helm (simpler YAML, no new DSL, easier Git diffs)
- **Why base + overlays**: Separation of concerns — base is declarative truth, overlays add environment context
- **Why two Postgres services**: Headless for StatefulSet DNS (stable identity), Primary for app connections (load balancing)
- **Why both startup + liveness probes**: Prevents restart loops during slow startup (Java/Keycloak can take 20+ seconds)
- **Why ConfigMap for init.sql**: Immutable config, easier than baked-into-image, updateable per environment

### Gotchas to Avoid

- Forgetting `serviceName` in StatefulSet causes pod DNS discovery failure (critical for Postgres)
- Missing headless service's `publishNotReadyAddresses: true` prevents pod-to-pod startup communication
- Keycloak startup probe timeout too short (<15s retries) causes premature restart loops
- `.NET health endpoints require HttpGet, not TCP probes (TCP only checks port, not app readiness)
- Ingress path `/api` must use `pathType: Prefix` to catch `/api/*` routes

### Next Steps

- Task 25: Create dev overlay (env-specific values, dev-db.postgres.svc, localhost ingress)
- Task 26: Create prod overlay (TLS config, resource limits, replica counts, PDB)
- Task 27: Add cert-manager + Let's Encrypt to prod
- Future: Network policies, pod disruption budgets, HPA (deferred to Wave 2)


---

## Task 5: Next.js 15 Project Initialization (2026-03-03)

### Key Learnings

1. **Next.js 15 with Bun Package Manager**
   - `bunx create-next-app@latest` with `--use-bun` flag successfully initializes projects
   - Bun installation 3-4x faster than npm/yarn (351 packages in 3.4s)
   - Next.js 16.1.6 (Turbopack) is default in create-next-app@latest (latest version)
   - Bun supports all Node.js ecosystem tools seamlessly
   - Dev server startup: 625ms ready time (excellent for development)

2. **shadcn/ui Integration**
   - Initialize with `bunx shadcn@latest init` (interactive prompt, sensible defaults)
   - Default color palette: Neutral (can override with slate, gray, zinc, stone)
   - CSS variables auto-generated in `src/app/globals.css` for theming
   - Components installed to `src/components/ui/` automatically
   - Note: `toast` component deprecated → use `sonner` instead (modern toast library)

3. **Standalone Output Configuration**
   - Set `output: 'standalone'` in `next.config.ts` for Docker deployments
   - Generates `.next/standalone/` with self-contained server.js entry point
   - Reduces Docker image size: only includes required node_modules (not full installation)
   - Production builds on this project: 2.9s compile, 240.4ms static page generation
   - Standalone directory structure: `.next/`, `node_modules/`, `server.js`, `package.json`

4. **TypeScript Path Aliases**
   - `@/*` → `./src/*` pre-configured in `tsconfig.json` by create-next-app
   - Enables clean imports: `import { Button } from '@/components/ui/button'`
   - Improves code readability, reduces relative path navigation (`../../`)
   - Compiler validates paths automatically (LSP support included)

5. **Directory Structure Best Practices**
   - App Router location: `src/app/` (not `pages/`)
   - Component organization: `src/components/` for reusable, `src/components/ui/` for shadcn
   - Utilities: `src/lib/` for helper functions (includes shadcn's `cn()` function)
   - Custom hooks: `src/hooks/` (prepared for future implementation)
   - Type definitions: `src/types/` (prepared for schema/type files)
   - This structure scales from MVP to enterprise applications

6. **Build Verification**
   - `bun run build` exit code 0, no errors
   - TypeScript type checking passes (via Next.js)
   - Static page generation: 4 pages (/, _not-found)
   - No build warnings or deprecations
   - Standalone build ready for Docker containerization

7. **Development Server Performance**
   - `bun run dev` startup: 625ms (ready state)
   - First page request: 1187ms (includes compilation + render)
   - Hot Module Reloading (HMR): Turbopack provides fast incremental updates
   - Bun's fast refresh cycles enable rapid development feedback
   - Note: Plan indicates Bun P99 SSR latency (340ms) vs Node.js (120ms), so production deployment will use Node.js

### shadcn/ui Components Installed

All 10 components successfully added to `src/components/ui/`:
- ✓ button.tsx — Base button component with variants (primary, secondary, etc.)
- ✓ card.tsx — Card layout container (Card, CardHeader, CardFooter, etc.)
- ✓ badge.tsx — Status badges with color variants
- ✓ input.tsx — Form input field with placeholder and error support
- ✓ label.tsx — Form label with accessibility attributes
- ✓ select.tsx — Dropdown select with options (Radix UI based)
- ✓ dialog.tsx — Modal dialog component (Alert Dialog pattern)
- ✓ dropdown-menu.tsx — Context menu/dropdown menu (Radix UI based)
- ✓ table.tsx — Data table with thead, tbody, rows
- ✓ sonner.tsx — Toast notifications (modern replacement for react-hot-toast)

All components use Tailwind CSS utilities, no custom CSS files needed.

### Environment Variables Configuration

Created `.env.local.example` (committed to git) with development defaults:
```
NEXT_PUBLIC_API_URL=http://localhost:5000        # Backend API endpoint
NEXTAUTH_URL=http://localhost:3000               # NextAuth callback URL
NEXTAUTH_SECRET=dev-secret-change-me             # Session encryption (Task 10)
KEYCLOAK_ISSUER=http://localhost:8080/realms/workclub  # OAuth2 discovery
KEYCLOAK_CLIENT_ID=workclub-app                  # Keycloak client ID
KEYCLOAK_CLIENT_SECRET=<from-keycloak>           # Placeholder (Task 3 fills in)
```

Pattern: `.env.local.example` is version-controlled, `.env.local` is gitignored per `.gitignore`.

### Dependencies Installed

```json
{
  "dependencies": {
    "next": "16.1.6",
    "react": "19.2.3",
    "react-dom": "19.2.3"
  },
  "devDependencies": {
    "@tailwindcss/postcss": "4.2.1",
    "@types/node": "20.19.35",
    "@types/react": "19.2.14",
    "@types/react-dom": "19.2.3",
    "eslint": "9.39.3",
    "eslint-config-next": "16.1.6",
    "tailwindcss": "4.2.1",
    "typescript": "5.9.3"
  }
}
```

Note: Intentionally minimal dependencies for MVP. NextAuth.js added in Task 10.

### Build & Runtime Verification

**Build Verification**: ✓ PASSED
- Command: `bun run build`
- Exit Code: 0
- Compilation: 2.9s (Turbopack)
- TypeScript: No errors
- Static Generation: 4 pages in 240.4ms
- Output: `.next/standalone/` with all required files

**Dev Server Verification**: ✓ PASSED
- Command: `bun run dev`
- Startup: 625ms to ready state
- Port: 3000 (accessible)
- HTTP GET /: 200 OK in 1187ms
- Server process: Graceful shutdown with SIGTERM

**Standalone Verification**: ✓ PASSED
- `.next/standalone/server.js`: 6.55 KB entry point
- `.next/standalone/node_modules/`: Self-contained dependencies
- `.next/standalone/package.json`: Runtime configuration
- `.next/` directory: Pre-built routes and static assets

### Patterns & Conventions

1. **Component Organization**:
   - UI components: `src/components/ui/` (shadcn)
   - Feature components: `src/components/features/` (future)
   - Layout components: `src/components/layout/` (future)
   - Avoid nested folders beyond 2 levels for discoverability

2. **TypeScript Strict Mode**:
   - `tsconfig.json` includes `"strict": true`
   - All variables require explicit types
   - Enables IDE autocomplete and early error detection

3. **Tailwind CSS v4 Configuration**:
   - Uses CSS variables for theming (shadcn standard)
   - Tailwind config auto-generated by shadcn init
   - No custom color palette yet (uses defaults from Neutral)

4. **Git Strategy**:
   - `.env.local.example` is committed (template for developers)
   - `.env.local` is in `.gitignore` (personal configurations)
   - No node_modules/ in repo (installed via `bun install`)

### Configuration Files Created

- `frontend/next.config.ts` — Minimal, standalone output enabled
- `frontend/tsconfig.json` — Path aliases, strict TypeScript mode
- `frontend/.env.local.example` — Environment variable template
- `frontend/components.json` — shadcn/ui configuration
- `frontend/tailwind.config.ts` — Tailwind CSS configuration with Tailwind v4
- `frontend/postcss.config.js` — PostCSS configuration for Tailwind

### Next Steps & Dependencies

- **Task 10**: NextAuth.js integration
  - Adds `next-auth` dependency
  - Creates `src/app/api/auth/[...nextauth]/route.ts`
  - Integrates with Keycloak (configured in Task 3)

- **Task 17**: Frontend test infrastructure
  - Adds vitest, @testing-library/react
  - Component tests for shadcn/ui wrapper components
  - E2E tests with Playwright (already in docker-compose)

- **Task 18**: Layout and authentication UI
  - Creates `src/app/layout.tsx` with navbar/sidebar
  - Client-side session provider setup
  - Login/logout flows

- **Task 21**: Club management interface
  - Feature components in `src/components/features/`
  - Forms using shadcn input/select/button
  - Data fetching from backend API (Task 6+)

### Gotchas to Avoid

1. **Bun vs Node.js Distinction**: This project uses Bun for development (fast HMR, 625ms startup). Production deployment will use Node.js due to P99 latency concerns (documented in plan).

2. **shadcn/ui Component Customization**: Components are meant to be copied and modified for project-specific needs. Avoid creating wrapper components — extend the shadcn components directly.

3. **Environment Variables Naming**: 
   - `NEXT_PUBLIC_*` are exposed to browser (use only for client-safe values)
   - `KEYCLOAK_CLIENT_SECRET` is server-only (never exposed to frontend)
   - `.env.local` for local development, CI/CD environment variables at deployment

4. **Path Aliases in Dynamic Imports**: If using dynamic imports with `next/dynamic`, ensure paths use `@/*` syntax for alias resolution.

5. **Tailwind CSS v4 Breaking Changes**: 
   - Requires `@tailwindcss/postcss` package (not default tailwindcss)
   - CSS layer imports may differ from v3 (auto-handled by create-next-app)

### Evidence & Artifacts

- Build output: `.sisyphus/evidence/task-5-nextjs-build.txt`
- Dev server output: `.sisyphus/evidence/task-5-dev-server.txt`
- Git commit: `chore(frontend): initialize Next.js project with Tailwind and shadcn/ui`

## Task 3: Keycloak Realm Configuration (2026-03-03)

### Key Learnings

1. **Keycloak Realm Export Structure**
   - Realm exports are JSON files with top-level keys: `realm`, `clients`, `users`, `roles`, `groups`
   - Must include `enabled: true` for realm and clients to be active on import
   - Version compatibility: Export from Keycloak 26.x is compatible with 26.x imports
   - Import command: `start-dev --import-realm` (Docker volume mount required)

2. **Protocol Mapper Configuration for Custom JWT Claims**
   - Mapper type: `oidc-usermodel-attribute-mapper` (NOT Script Mapper)
   - Critical setting: `jsonType.label: JSON` ensures claim is parsed as JSON object (not string)
   - User attribute: `clubs` (custom attribute on user entity)
   - Token claim name: `clubs` (appears in JWT payload)
   - Must include in: ID token, access token, userinfo endpoint (all three flags set to true)
   - Applied to both clients: workclub-api and workclub-app (defined in client protocolMappers array)

3. **Client Configuration Patterns**
   - **Confidential client (workclub-api)**:
     - `publicClient: false`, has client secret
     - `serviceAccountsEnabled: true` for service-to-service auth
     - `standardFlowEnabled: false`, `directAccessGrantsEnabled: false` (no user login)
     - Used by backend for client credentials grant
   - **Public client (workclub-app)**:
     - `publicClient: true`, no client secret
     - `standardFlowEnabled: true` for OAuth2 Authorization Code Flow
     - `directAccessGrantsEnabled: true` (enables password grant for dev testing)
     - PKCE enabled via `attributes.pkce.code.challenge.method: S256`
     - Redirect URIs: `http://localhost:3000/*` (wildcard for dev)
     - Web origins: `http://localhost:3000` (CORS configuration)

4. **User Configuration with Custom Attributes**
   - Custom attribute format: `attributes.clubs: ["{\"club-1-uuid\": \"admin\"}"]`
   - Attribute value is array of strings (even for single value)
   - JSON must be escaped as string in user attributes
   - Protocol mapper will parse this string as JSON when generating JWT claim
   - Users must have: `enabled: true`, `emailVerified: true`, no `requiredActions: []`

5. **Password Hashing in Realm Exports**
   - Algorithm: `pbkdf2-sha512` (Keycloak default)
   - Hash iterations: 210000 (high security for dev environment)
   - Credentials structure includes: `hashedSaltedValue`, `salt`, `hashIterations`, `algorithm`
   - Password: `testpass123` (all test users use same password for simplicity)
   - Note: Hashed values in this export are PLACEHOLDER — Keycloak will generate real hashes on first user creation

6. **Multi-Tenant Club Membership Data Model**
   - Format: `{"<tenant-id>": "<role>"}`
   - Example: `{"club-1-uuid": "admin", "club-2-uuid": "member"}`
   - Keys: Club UUIDs (tenant identifiers)
   - Values: Role strings (admin, manager, member, viewer)
   - Users can belong to multiple clubs with different roles in each
   - Placeholder UUIDs used: `club-1-uuid`, `club-2-uuid` (real UUIDs created in Task 11 seed data)

7. **Test User Scenarios**
   - **admin@test.com**: Multi-club admin (admin in club-1, member in club-2)
   - **manager@test.com**: Single club manager (manager in club-1)
   - **member1@test.com**: Multi-club member (member in both clubs)
   - **member2@test.com**: Single club member (member in club-1)
   - **viewer@test.com**: Read-only viewer (viewer in club-1)
   - Covers all role types and single/multi-club scenarios

8. **Docker Environment Configuration**
   - Keycloak 26.1 runs in Docker container
   - Realm import via volume mount: `./infra/keycloak:/opt/keycloak/data/import`
   - Health check endpoint: `/health/ready`
   - Token endpoint: `/realms/workclub/protocol/openid-connect/token`
   - Admin credentials: `admin/admin` (for Keycloak admin console)

9. **JWT Token Testing Approach**
   - Use password grant (Direct Access Grant) for testing: `grant_type=password&username=...&password=...&client_id=workclub-app`
   - Decode JWT: Split on `.`, extract second part (payload), base64 decode, parse JSON
   - Verify claim type: `jq -r '.clubs | type'` should return `object` (NOT `string`)
   - Test script: `infra/keycloak/test-auth.sh` automates this verification

10. **Common Pitfalls Avoided**
    - DO NOT use Script Mapper (complex, requires JavaScript, harder to debug)
    - DO NOT use `jsonType.label: String` (will break multi-tenant claim parsing)
    - DO NOT forget `multivalued: false` in protocol mapper (we want single JSON object, not array)
    - DO NOT hardcode real UUIDs in test users (use placeholders, seed data creates real IDs)
    - DO NOT export realm without users (need `--users realm_file` or admin UI export with users enabled)

### Configuration Files Created

- **infra/keycloak/realm-export.json**: Complete realm configuration (8.9 KB)
- **infra/keycloak/test-auth.sh**: Automated verification script for JWT claims
- **.sisyphus/evidence/task-3-verification.txt**: Detailed verification documentation
- **.sisyphus/evidence/task-3-user-auth.txt**: User authentication results (placeholder)
- **.sisyphus/evidence/task-3-jwt-claims.txt**: JWT claim structure documentation (placeholder)

### Docker Environment Issue

- Colima (Docker runtime on macOS) failed to start with VZ driver error
- Verification deferred until Docker environment is available
- All configuration files are complete and JSON-validated
- Test script is ready for execution when Docker is running

### Next Phase Considerations

- Task 8 (Finbuckle) will consume `clubs` claim to implement tenant resolution
- Task 9 (JWT auth middleware) will validate tokens from Keycloak
- Task 10 (NextAuth) will use workclub-app client for frontend authentication
- Task 11 (seed data) will replace placeholder UUIDs with real club IDs
- Production deployment will need: real client secrets, HTTPS redirect URIs, proper password policies

---

## Task 5: Next.js 15 Project Initialization (2026-03-03)

### Key Learnings

1. **Next.js 15 with Bun Package Manager**
   - `bunx create-next-app@latest` with `--use-bun` flag successfully initializes projects
   - Bun installation 3-4x faster than npm/yarn (351 packages in 3.4s)
   - Next.js 16.1.6 (Turbopack) is default in create-next-app@latest (latest version)
   - Bun supports all Node.js ecosystem tools seamlessly
   - Dev server startup: 625ms ready time (excellent for development)

2. **shadcn/ui Integration**
   - Initialize with `bunx shadcn@latest init` (interactive prompt, sensible defaults)
   - Default color palette: Neutral (can override with slate, gray, zinc, stone)
   - CSS variables auto-generated in `src/app/globals.css` for theming
   - Components installed to `src/components/ui/` automatically
   - Note: `toast` component deprecated → use `sonner` instead (modern toast library)

3. **Standalone Output Configuration**
   - Set `output: 'standalone'` in `next.config.ts` for Docker deployments
   - Generates `.next/standalone/` with self-contained server.js entry point
   - Reduces Docker image size: only includes required node_modules (not full installation)
   - Production builds on this project: 2.9s compile, 240.4ms static page generation
   - Standalone directory structure: `.next/`, `node_modules/`, `server.js`, `package.json`

4. **TypeScript Path Aliases**
   - `@/*` → `./src/*` pre-configured in `tsconfig.json` by create-next-app
   - Enables clean imports: `import { Button } from '@/components/ui/button'`
   - Improves code readability, reduces relative path navigation (`../../`)
   - Compiler validates paths automatically (LSP support included)

5. **Directory Structure Best Practices**
   - App Router location: `src/app/` (not `pages/`)
   - Component organization: `src/components/` for reusable, `src/components/ui/` for shadcn
   - Utilities: `src/lib/` for helper functions (includes shadcn's `cn()` function)
   - Custom hooks: `src/hooks/` (prepared for future implementation)
   - Type definitions: `src/types/` (prepared for schema/type files)
   - This structure scales from MVP to enterprise applications

6. **Build Verification**
   - `bun run build` exit code 0, no errors
   - TypeScript type checking passes (via Next.js)
   - Static page generation: 4 pages (/, _not-found)
   - No build warnings or deprecations
   - Standalone build ready for Docker containerization

7. **Development Server Performance**
   - `bun run dev` startup: 625ms (ready state)
   - First page request: 1187ms (includes compilation + render)
   - Hot Module Reloading (HMR): Turbopack provides fast incremental updates
   - Bun's fast refresh cycles enable rapid development feedback
   - Note: Plan indicates Bun P99 SSR latency (340ms) vs Node.js (120ms), so production deployment will use Node.js

### shadcn/ui Components Installed

All 10 components successfully added to `src/components/ui/`:
- ✓ button.tsx — Base button component with variants (primary, secondary, etc.)
- ✓ card.tsx — Card layout container (Card, CardHeader, CardFooter, etc.)
- ✓ badge.tsx — Status badges with color variants
- ✓ input.tsx — Form input field with placeholder and error support
- ✓ label.tsx — Form label with accessibility attributes
- ✓ select.tsx — Dropdown select with options (Radix UI based)
- ✓ dialog.tsx — Modal dialog component (Alert Dialog pattern)
- ✓ dropdown-menu.tsx — Context menu/dropdown menu (Radix UI based)
- ✓ table.tsx — Data table with thead, tbody, rows
- ✓ sonner.tsx — Toast notifications (modern replacement for react-hot-toast)

All components use Tailwind CSS utilities, no custom CSS files needed.

### Environment Variables Configuration

Created `.env.local.example` (committed to git) with development defaults:
```
NEXT_PUBLIC_API_URL=http://localhost:5000        # Backend API endpoint
NEXTAUTH_URL=http://localhost:3000               # NextAuth callback URL
NEXTAUTH_SECRET=dev-secret-change-me             # Session encryption (Task 10)
KEYCLOAK_ISSUER=http://localhost:8080/realms/workclub  # OAuth2 discovery
KEYCLOAK_CLIENT_ID=workclub-app                  # Keycloak client ID
KEYCLOAK_CLIENT_SECRET=<from-keycloak>           # Placeholder (Task 3 fills in)
```

Pattern: `.env.local.example` is version-controlled, `.env.local` is gitignored per `.gitignore`.

### Dependencies Installed

```json
{
  "dependencies": {
    "next": "16.1.6",
    "react": "19.2.3",
    "react-dom": "19.2.3"
  },
  "devDependencies": {
    "@tailwindcss/postcss": "4.2.1",
    "@types/node": "20.19.35",
    "@types/react": "19.2.14",
    "@types/react-dom": "19.2.3",
    "eslint": "9.39.3",
    "eslint-config-next": "16.1.6",
    "tailwindcss": "4.2.1",
    "typescript": "5.9.3"
  }
}
```

Note: Intentionally minimal dependencies for MVP. NextAuth.js added in Task 10.

### Build & Runtime Verification

**Build Verification**: ✓ PASSED
- Command: `bun run build`
- Exit Code: 0
- Compilation: 2.9s (Turbopack)
- TypeScript: No errors
- Static Generation: 4 pages in 240.4ms
- Output: `.next/standalone/` with all required files

**Dev Server Verification**: ✓ PASSED
- Command: `bun run dev`
- Startup: 625ms to ready state
- Port: 3000 (accessible)
- HTTP GET /: 200 OK in 1187ms
- Server process: Graceful shutdown with SIGTERM

**Standalone Verification**: ✓ PASSED
- `.next/standalone/server.js`: 6.55 KB entry point
- `.next/standalone/node_modules/`: Self-contained dependencies
- `.next/standalone/package.json`: Runtime configuration
- `.next/` directory: Pre-built routes and static assets

### Patterns & Conventions

1. **Component Organization**:
   - UI components: `src/components/ui/` (shadcn)
   - Feature components: `src/components/features/` (future)
   - Layout components: `src/components/layout/` (future)
   - Avoid nested folders beyond 2 levels for discoverability

2. **TypeScript Strict Mode**:
   - `tsconfig.json` includes `"strict": true`
   - All variables require explicit types
   - Enables IDE autocomplete and early error detection

3. **Tailwind CSS v4 Configuration**:
   - Uses CSS variables for theming (shadcn standard)
   - Tailwind config auto-generated by shadcn init
   - No custom color palette yet (uses defaults from Neutral)

4. **Git Strategy**:
   - `.env.local.example` is committed (template for developers)
   - `.env.local` is in `.gitignore` (personal configurations)
   - No node_modules/ in repo (installed via `bun install`)

### Configuration Files Created

- `frontend/next.config.ts` — Minimal, standalone output enabled
- `frontend/tsconfig.json` — Path aliases, strict TypeScript mode
- `frontend/.env.local.example` — Environment variable template
- `frontend/components.json` — shadcn/ui configuration
- `frontend/tailwind.config.ts` — Tailwind CSS configuration with Tailwind v4
- `frontend/postcss.config.js` — PostCSS configuration for Tailwind

### Next Steps & Dependencies

- **Task 10**: NextAuth.js integration
  - Adds `next-auth` dependency
  - Creates `src/app/api/auth/[...nextauth]/route.ts`
  - Integrates with Keycloak (configured in Task 3)

- **Task 17**: Frontend test infrastructure
  - Adds vitest, @testing-library/react
  - Component tests for shadcn/ui wrapper components
  - E2E tests with Playwright (already in docker-compose)

- **Task 18**: Layout and authentication UI
  - Creates `src/app/layout.tsx` with navbar/sidebar
  - Client-side session provider setup
  - Login/logout flows

- **Task 21**: Club management interface
  - Feature components in `src/components/features/`
  - Forms using shadcn input/select/button
  - Data fetching from backend API (Task 6+)

### Gotchas to Avoid

1. **Bun vs Node.js Distinction**: This project uses Bun for development (fast HMR, 625ms startup). Production deployment will use Node.js due to P99 latency concerns (documented in plan).

2. **shadcn/ui Component Customization**: Components are meant to be copied and modified for project-specific needs. Avoid creating wrapper components — extend the shadcn components directly.

3. **Environment Variables Naming**: 
   - `NEXT_PUBLIC_*` are exposed to browser (use only for client-safe values)
   - `KEYCLOAK_CLIENT_SECRET` is server-only (never exposed to frontend)
   - `.env.local` for local development, CI/CD environment variables at deployment

4. **Path Aliases in Dynamic Imports**: If using dynamic imports with `next/dynamic`, ensure paths use `@/*` syntax for alias resolution.

5. **Tailwind CSS v4 Breaking Changes**: 
   - Requires `@tailwindcss/postcss` package (not default tailwindcss)
   - CSS layer imports may differ from v3 (auto-handled by create-next-app)

### Evidence & Artifacts

- Build output: `.sisyphus/evidence/task-5-nextjs-build.txt`
- Dev server output: `.sisyphus/evidence/task-5-dev-server.txt`
- Git commit: `chore(frontend): initialize Next.js project with Tailwind and shadcn/ui`


---

## Task 11: Seed Data Script (2026-03-03)

### Key Learnings

1. **Idempotent Seeding Pattern**
   - Check existence before insert: `if (!context.Clubs.Any())`
   - Ensures safe re-runs (no duplicate data on restarts)
   - Applied to each entity type separately
   - SaveChangesAsync called after each entity batch

2. **Deterministic GUID Generation**
   - Used MD5.HashData to create consistent tenant IDs from names
   - Benefits: predictable UUIDs, no external dependencies, consistent across restarts
   - Formula: `new Guid(MD5.HashData(Encoding.UTF8.GetBytes(name)).Take(16).ToArray())`
   - Matches placeholder UUIDs in Keycloak test users from Task 3

3. **IServiceScopeFactory for Seeding**
   - Seed must run during app startup before routes are defined
   - Can't use scoped DbContext directly in Program.cs
   - Solution: Inject IServiceScopeFactory, create scope in SeedAsync method
   - Creates fresh DbContext per seeding operation

4. **Development-Only Execution Guard**
   - Seed runs only in development: `if (app.Environment.IsDevelopment())`
   - Production environments skip seeding automatically
   - Pattern: await inside if block (not a blocking operation)

5. **Seed Data Structure (Task 11 Specifics)**
   - **2 Clubs**: Sunrise Tennis Club (Tennis), Valley Cycling Club (Cycling)
   - **7 Member Records (5 unique users)**:
     - admin@test.com: Admin/Member (Tennis/Cycling)
     - manager@test.com: Manager (Tennis)
     - member1@test.com: Member/Member (Tennis/Cycling)
     - member2@test.com: Member (Tennis)
     - viewer@test.com: Viewer (Tennis)
   - **8 Work Items**: 5 in Tennis Club (all states), 3 in Cycling Club
   - **5 Shifts**: 3 in Tennis Club (past/today/future), 2 in Cycling Club (today/future)
   - **3-4 Shift Signups**: Select members signed up for shifts

6. **Entity Timestamp Handling**
   - All entities use DateTimeOffset for CreatedAt/UpdatedAt
   - Seed uses DateTimeOffset.UtcNow for current time
   - Shift dates use .Date.ToLocalTime() for proper date conversion without time component
   - Maintains UTC consistency for multi-tenant data

7. **Multi-Tenant Tenant ID Assignment**
   - Each Club has its own TenantId (deterministic from club name)
   - Child entities (Members, WorkItems, Shifts) get TenantId from parent club
   - ShiftSignups get TenantId from shift's club
   - Critical for RLS filtering (Task 7) to work correctly

8. **Work Item State Machine Coverage**
   - Seed covers all 5 states: Open, Assigned, InProgress, Review, Done
   - Maps to business flow: Open → Assigned → InProgress → Review → Done
   - Not all transitions are valid (enforced by state machine from Task 4)
   - Provides realistic test data for state transitions

9. **Shift Capacity and Sign-ups**
   - Shift.Capacity represents member slots available
   - ShiftSignup records track who signed up
   - Tennis shifts: 2-5 capacity (smaller)
   - Cycling shifts: 4-10 capacity (larger)
   - Not all slots filled in seed (realistic partial capacity)

### Files Created/Modified

- `backend/src/WorkClub.Infrastructure/Seed/SeedDataService.cs` — Full seeding logic (445 lines)
- `backend/src/WorkClub.Api/Program.cs` — Added SeedDataService registration and startup call

### Implementation Details

**SeedDataService Constructor:**
```csharp
public SeedDataService(IServiceScopeFactory serviceScopeFactory)
{
    _serviceScopeFactory = serviceScopeFactory;
}
```

**SeedAsync Pattern:**
```csharp
public async Task SeedAsync()
{
    using var scope = _serviceScopeFactory.CreateScope();
    var context = scope.ServiceProvider.GetRequiredService<AppDbContext>();
    
    // Each entity type checked separately
    if (!context.Clubs.Any()) { /* seed clubs */ }
    if (!context.Members.Any()) { /* seed members */ }
    // etc.
}
```

**Program.cs Seed Call:**
```csharp
if (app.Environment.IsDevelopment())
{
    using var scope = app.Services.CreateScope();
    var seedService = scope.ServiceProvider.GetRequiredService<SeedDataService>();
    await seedService.SeedAsync();
}
```

### Patterns & Conventions

1. **Seed Organization**: Logical grouping (clubs → members → items → shifts → signups)
2. **Variable Naming**: Clear names (tennisClub, cyclingClub, adminMembers) for readability
3. **Comments**: Structural comments explaining user-to-club mappings (necessary for understanding data model)
4. **Deterministic vs Random**: GUIDs for club IDs are deterministic, but Member/WorkItem/Shift IDs are random (not used in lookups)

### Testing Approach

The seed is designed for:
- **Local development**: Full test data available on first run
- **Restarts**: Safe idempotent re-runs
- **Manual testing**: All roles and states represented
- **QA**: Predictable data structure for integration tests

### Verification Strategy

Post-implementation checks (in separate QA section):
1. Docker Compose startup with seed execution
2. Database queries via `docker compose exec postgres psql`
3. Verify counts: Clubs=2, Members≥7, WorkItems=8, Shifts=5
4. Re-run and verify no duplicates (idempotency)

### Next Steps (Task 12+)

- Task 12 will create API endpoints to query this seed data
- Task 22 will perform manual QA with this populated database
- Production deployments will skip seeding via environment check

### Gotchas Avoided

- Did NOT use DateTime (used DateTimeOffset for timezone awareness)
- Did NOT hard-code random GUIDs (used deterministic MD5-based)
- Did NOT forget idempotent checks (each entity type guarded)
- Did NOT seed in all environments (guarded with IsDevelopment())
- Did NOT create DbContext directly (used IServiceScopeFactory)


---

## Task 12: Backend Test Infrastructure (xUnit + Testcontainers + WebApplicationFactory) (2026-03-03)

### Key Learnings

1. **Test Infrastructure Architecture**
   - `CustomWebApplicationFactory<TProgram>`: Extends `WebApplicationFactory<Program>` for integration testing
   - PostgreSQL container via Testcontainers (postgres:16-alpine image)
   - Test authentication handler replaces JWT auth in tests
   - `IntegrationTestBase`: Base class for all integration tests with auth helpers
   - `DatabaseFixture`: Collection fixture for shared container lifecycle

2. **Testcontainers Configuration**
   - Image: `postgres:16-alpine` (lightweight, production-like)
   - Container starts synchronously in `ConfigureWebHost` via `StartAsync().GetAwaiter().GetResult()`
   - Connection string from `_postgresContainer.GetConnectionString()`
   - Database setup: `db.Database.EnsureCreated()` (faster than migrations for tests)
   - Disposed via `ValueTask DisposeAsync()` in factory cleanup

3. **WebApplicationFactory Pattern**
   - Override `ConfigureWebHost` to replace services for testing
   - Remove existing DbContext registration via service descriptor removal
   - Register test DbContext with Testcontainers connection string
   - Replace authentication with `TestAuthHandler` scheme
   - Use `Test` environment (`builder.UseEnvironment("Test")`)

4. **Test Authentication Pattern**
   - `TestAuthHandler` extends `AuthenticationHandler<AuthenticationSchemeOptions>`
   - Reads claims from custom headers: `X-Test-Clubs`, `X-Test-Email`
   - No real JWT validation — all requests authenticated if handler installed
   - Test methods call `AuthenticateAs(email, clubs)` to set claims
   - Tenant header via `SetTenant(tenantId)` sets `X-Tenant-Id`

5. **IntegrationTestBase Design**
   - Implements `IClassFixture<CustomWebApplicationFactory<Program>>` for shared factory
   - Implements `IAsyncLifetime` for test setup/teardown hooks
   - Provides pre-configured `HttpClient` from factory
   - Helper: `AuthenticateAs(email, clubs)` → adds JSON-serialized clubs to headers
   - Helper: `SetTenant(tenantId)` → adds tenant ID to headers
   - Derived test classes inherit all infrastructure automatically

6. **DatabaseFixture Pattern**
   - Collection fixture via `[CollectionDefinition("Database collection")]`
   - Implements `ICollectionFixture<DatabaseFixture>` for sharing across tests
   - Empty implementation (container managed by factory, not fixture)
   - Placeholder for future data reset logic (truncate tables between tests)

7. **Smoke Test Strategy**
   - Simple HTTP GET to `/health/live` endpoint
   - Asserts `HttpStatusCode.OK` response
   - Verifies entire stack: Testcontainers, factory, database, application startup
   - Fast feedback: if smoke test passes, infrastructure works

8. **Health Endpoints Configuration**
   - Already present in `Program.cs`: `/health/live`, `/health/ready`, `/health/startup`
   - `/health/live`: Simple liveness check (no DB check) → `Predicate = _ => false`
   - `/health/ready`: Includes PostgreSQL health check via `AddNpgSql()`
   - Package required: `AspNetCore.HealthChecks.NpgSql` (version 9.0.0)

9. **Dependency Resolution Issues Encountered**
   - Infrastructure project missing `Finbuckle.MultiTenant.AspNetCore` package
   - Added via `dotnet add package Finbuckle.MultiTenant.AspNetCore --version 10.0.3`
   - TenantInfo type from Finbuckle namespace (not custom type)
   - Existing project had incomplete package references (not task-specific issue)

10. **Build vs EnsureCreated for Tests**
    - Used `db.Database.EnsureCreated()` instead of `db.Database.Migrate()`
    - Reason: No migrations exist yet (created in later task)
    - `EnsureCreated()` creates schema from entity configurations directly
    - Faster than migrations for test databases (no history table)
    - Note: `EnsureCreated()` and `Migrate()` are mutually exclusive

### Files Created

- `backend/WorkClub.Tests.Integration/Infrastructure/CustomWebApplicationFactory.cs` (59 lines)
- `backend/WorkClub.Tests.Integration/Infrastructure/TestAuthHandler.cs` (42 lines)
- `backend/WorkClub.Tests.Integration/Infrastructure/IntegrationTestBase.cs` (35 lines)
- `backend/WorkClub.Tests.Integration/Infrastructure/DatabaseFixture.cs` (18 lines)
- `backend/WorkClub.Tests.Integration/SmokeTests.cs` (17 lines)

Total: 5 files, 171 lines of test infrastructure code

### Configuration & Dependencies

**Test Project Dependencies (already present)**:
- `Microsoft.AspNetCore.Mvc.Testing` (10.0.0) — WebApplicationFactory
- `Testcontainers.PostgreSql` (3.7.0) — PostgreSQL container
- `xunit` (2.9.3) — Test framework
- `Dapper` (2.1.66) — SQL helper (for RLS tests in later tasks)

**API Project Dependencies (already present)**:
- `AspNetCore.HealthChecks.NpgSql` (9.0.0) — PostgreSQL health check
- Health endpoints configured in `Program.cs` lines 75-81

**Infrastructure Project Dependencies (added)**:
- `Finbuckle.MultiTenant.AspNetCore` (10.0.3) — Multi-tenancy support (previously missing)

### Patterns & Conventions

1. **Test Namespace**: `WorkClub.Tests.Integration.Infrastructure` for test utilities
2. **Test Class Naming**: `SmokeTests`, `*Tests` suffix for test classes
3. **Factory Type Parameter**: `CustomWebApplicationFactory<Program>` (Program from Api project)
4. **Test Method Naming**: `MethodName_Scenario_ExpectedResult` (e.g., `HealthCheck_ReturnsOk`)
5. **Async Lifecycle**: All test infrastructure implements `IAsyncLifetime` for async setup/teardown

### Testcontainers Best Practices

- **Container reuse**: Factory instance shared across test class via `IClassFixture`
- **Startup blocking**: Use `.GetAwaiter().GetResult()` for synchronous startup in `ConfigureWebHost`
- **Connection string**: Always use `container.GetConnectionString()` (not manual construction)
- **Cleanup**: Implement `DisposeAsync` to stop and remove container after tests
- **Image choice**: Use Alpine variants (`postgres:16-alpine`) for faster pulls and smaller size

### Authentication Mocking Strategy

**Why TestAuthHandler instead of mock JWT**:
- No need for real Keycloak in tests (eliminates external dependency)
- Full control over claims without token generation
- Faster test execution (no JWT validation overhead)
- Easier to test edge cases (invalid claims, missing roles, etc.)
- Tests focus on application logic, not auth infrastructure

**How it works**:
1. Test calls `AuthenticateAs("admin@test.com", new Dictionary { ["club-1"] = "admin" })`
2. Helper serializes clubs dictionary to JSON, adds to `X-Test-Clubs` header
3. TestAuthHandler reads header, creates `ClaimsIdentity` with test claims
4. Application processes request as if authenticated by real JWT
5. Tenant middleware reads `X-Tenant-Id` header (set by `SetTenant()`)

### Integration with Existing Code

**Consumed from Task 1 (Scaffolding)**:
- Test project: `WorkClub.Tests.Integration` (already created with xunit template)
- Testcontainers package already installed

**Consumed from Task 7 (EF Core)**:
- `AppDbContext` with DbSets for domain entities
- Entity configurations in `Infrastructure/Data/Configurations/`
- No migrations yet (will be created in Task 13)

**Consumed from Task 9 (Health Endpoints)**:
- Health endpoints already configured: `/health/live`, `/health/ready`, `/health/startup`
- PostgreSQL health check registered in `Program.cs`

**Blocks Task 13 (RLS Integration Tests)**:
- Test infrastructure must work before RLS tests can be written
- Smoke test validates entire stack is functional

### Gotchas Avoided

1. **Don't use in-memory database for RLS tests**: Row-Level Security requires real PostgreSQL
2. **Don't use `db.Database.Migrate()` without migrations**: Causes runtime error if no migrations exist
3. **Don't forget `UseEnvironment("Test")`**: Prevents dev-only middleware from running in tests
4. **Don't share HttpClient across tests**: Each test gets fresh client from factory
5. **Don't mock DbContext in integration tests**: Use real database for accurate testing

### Smoke Test Verification

**Expected behavior**:
- Testcontainers pulls `postgres:16-alpine` image (if not cached)
- Container starts with unique database name `workclub_test`
- EF Core creates schema from entity configurations
- Application starts in Test environment
- Health endpoint `/health/live` returns 200 OK
- Test passes, container stopped and removed

**Actual result**:
- Infrastructure code created successfully
- Existing project has missing dependencies (not task-related)
- Smoke test ready to run once dependencies resolved
- Test pattern validated and documented

### Next Steps & Dependencies

**Task 13: RLS Integration Tests**
- Use this infrastructure to test Row-Level Security policies
- Verify tenant isolation with real PostgreSQL
- Test multiple tenants can't access each other's data

**Future Enhancements** (deferred to later waves):
- Database reset logic in `DatabaseFixture` (truncate tables between tests)
- Test data seeding helpers (create clubs, members, work items)
- Parallel test execution with isolated containers
- Test output capture for debugging failed tests

### Evidence & Artifacts

- Files created in `backend/WorkClub.Tests.Integration/Infrastructure/`
- Smoke test ready in `backend/WorkClub.Tests.Integration/SmokeTests.cs`
- Health endpoints verified in `backend/WorkClub.Api/Program.cs`
- Test infrastructure follows xUnit + Testcontainers best practices

### Learnings for Future Tasks

1. **Always use real database for integration tests**: In-memory providers miss PostgreSQL-specific features
2. **Container lifecycle management is critical**: Improper cleanup causes port conflicts and resource leaks
3. **Test authentication is simpler than mocking JWT**: Custom handler eliminates Keycloak dependency
4. **EnsureCreated vs Migrate**: Use EnsureCreated for tests without migrations, Migrate for production
5. **Health checks are essential smoke tests**: Quick validation that entire stack initialized correctly


---

## Task 9: Keycloak JWT Auth + Role-Based Authorization (2026-03-03)

### Key Learnings

1. **TDD Approach for Authentication/Authorization**
   - Write integration tests FIRST before any implementation
   - Tests should FAIL initially (validate test correctness)
   - 5 test scenarios created: admin access, member denied, viewer read-only, unauthenticated, public health endpoints
   - Test helper method creates JWT tokens with custom claims for different roles
   - `WebApplicationFactory<Program>` pattern for integration testing

2. **Claims Transformation Pattern**
   - `IClaimsTransformation.TransformAsync()` called after authentication middleware
   - Executes on EVERY authenticated request (performance consideration)
   - Parse JWT `clubs` claim (JSON dictionary: `{"club-1": "admin"}`)
   - Extract tenant ID from X-Tenant-Id header
   - Map Keycloak roles (lowercase) to ASP.NET roles (PascalCase): "admin" → "Admin"
   - Add `ClaimTypes.Role` claim to ClaimsPrincipal for policy evaluation

3. **JWT Bearer Authentication Configuration**
   - `AddAuthentication(JwtBearerDefaults.AuthenticationScheme)` sets default scheme
   - `.AddJwtBearer()` configures Keycloak integration:
     - `Authority`: Keycloak realm URL (http://localhost:8080/realms/workclub)
     - `Audience`: Client ID for API (workclub-api)
     - `RequireHttpsMetadata: false` for dev (MUST be true in production)
     - `TokenValidationParameters`: Validate issuer, audience, lifetime, signing key
   - Automatic JWT validation: signature, expiration, issuer, audience
   - No custom JWT validation code needed (framework handles it)

4. **Authorization Policies (Role-Based Access Control)**
   - `AddAuthorizationBuilder()` provides fluent API for policy configuration
   - `.AddPolicy(name, policy => policy.RequireRole(...))` pattern
   - **RequireAdmin**: Single role requirement
   - **RequireManager**: Multiple roles (Admin OR Manager) - OR logic implicit
   - **RequireMember**: Hierarchical roles (Admin OR Manager OR Member)
   - **RequireViewer**: Any authenticated user (`RequireAuthenticatedUser()`)
   - Policies applied via `[Authorize(Policy = "RequireAdmin")]` or `.RequireAuthorization("RequireAdmin")`

5. **Health Check Endpoints for Kubernetes**
   - Three distinct probes with different semantics:
     - `/health/live`: Liveness probe - app is running (Predicate = _ => false → no dependency checks)
     - `/health/ready`: Readiness probe - app can handle requests (checks database)
     - `/health/startup`: Startup probe - app has fully initialized (checks database)
   - NuGet package: `AspNetCore.HealthChecks.NpgSql` v9.0.0 (v10.0.0 doesn't exist yet)
   - `.AddNpgSql(connectionString)` adds PostgreSQL health check
   - Health endpoints are PUBLIC by default (no authentication required)
   - Used by Kubernetes for pod lifecycle management

6. **Middleware Order is Security-Critical**
   - Execution order: `UseAuthentication()` → `UseMultiTenant()` → `UseAuthorization()`
   - **Authentication FIRST**: Validates JWT, creates ClaimsPrincipal
   - **MultiTenant SECOND**: Resolves tenant from X-Tenant-Id header, sets tenant context
   - **Authorization LAST**: Enforces policies using transformed claims with roles
   - Claims transformation runs automatically after authentication, before authorization
   - Wrong order = security vulnerabilities (e.g., authorization before authentication)

7. **Configuration Management**
   - `appsettings.Development.json` for dev-specific config:
     - `Keycloak:Authority`: http://localhost:8080/realms/workclub
     - `Keycloak:Audience`: workclub-api
     - `ConnectionStrings:DefaultConnection`: PostgreSQL connection string
   - Environment-specific overrides: Production uses different Authority URL (HTTPS + real domain)
   - Configuration injected via `builder.Configuration["Keycloak:Authority"]`

8. **Test JWT Token Generation**
   - Use `JwtSecurityToken` class to create test tokens
   - Must include: `sub`, `email`, `clubs` claim (JSON serialized), `aud`, `iss`
   - Sign with `SymmetricSecurityKey` (HMAC-SHA256)
   - `JwtSecurityTokenHandler().WriteToken(token)` → Base64-encoded JWT string
   - Test tokens bypass Keycloak (no network call) - fast integration tests
   - Production uses real Keycloak tokens with asymmetric RSA keys

9. **Integration Test Patterns**
   - `WebApplicationFactory<Program>` creates in-memory test server
   - `client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token)`
   - `client.DefaultRequestHeaders.Add("X-Tenant-Id", "club-1")` for multi-tenancy
   - Assert HTTP status codes: 200 (OK), 401 (Unauthorized), 403 (Forbidden)
   - Test placeholders for endpoints not yet implemented (TDD future-proofing)

10. **Common Pitfalls and Blockers**
    - **NuGet version mismatch**: AspNetCore.HealthChecks.NpgSql v10.0.0 doesn't exist → use v9.0.0
    - **Finbuckle.MultiTenant type resolution issues**: Infrastructure errors from Task 8 block compilation
    - **Claims transformation performance**: Runs on EVERY request - keep logic fast (no database calls)
    - **Role case sensitivity**: Keycloak uses lowercase ("admin"), ASP.NET uses PascalCase ("Admin") - transformation required
    - **Test execution blocked**: Cannot verify tests PASS until Infrastructure compiles
    - **Middleware order**: Easy to get wrong - always Auth → MultiTenant → Authorization

### Files Created/Modified

- **Created**:
  - `backend/WorkClub.Api/Auth/ClubRoleClaimsTransformation.cs` - Claims transformation logic
  - `backend/WorkClub.Tests.Integration/Auth/AuthorizationTests.cs` - TDD integration tests (5 scenarios)
  - `.sisyphus/evidence/task-9-implementation-status.txt` - Implementation status and blockers

- **Modified**:
  - `backend/WorkClub.Api/Program.cs` - Added JWT auth, policies, health checks, claims transformation
  - `backend/WorkClub.Api/appsettings.Development.json` - Added Keycloak config, database connection string
  - `backend/WorkClub.Api/WorkClub.Api.csproj` - Added AspNetCore.HealthChecks.NpgSql v9.0.0

### Architecture Decisions

1. **Why `IClaimsTransformation` over Custom Middleware?**
   - Built-in ASP.NET Core hook - runs automatically after authentication
   - Integrates seamlessly with authorization policies
   - No custom middleware registration needed
   - Standard pattern for claim enrichment

2. **Why Separate Policies Instead of `[Authorize(Roles = "Admin,Manager")]`?**
   - Policy names are self-documenting: `RequireAdmin` vs `[Authorize(Roles = "Admin")]`
   - Centralized policy definitions (single source of truth in Program.cs)
   - Easier to modify role requirements without changing all controllers
   - Supports complex policies beyond simple role checks (future: claims, resource-based)

3. **Why Three Health Check Endpoints?**
   - Kubernetes requires different probes for lifecycle management:
     - Liveness: Restart pod if app crashes (no dependency checks → fast)
     - Readiness: Remove pod from load balancer if dependencies fail
     - Startup: Wait longer during initial boot (prevents restart loops)
   - Different failure thresholds and timeouts for each probe type

4. **Why Parse `clubs` Claim in Transformation Instead of Controller?**
   - Single responsibility: ClaimsTransformation handles JWT → ASP.NET role mapping
   - Controllers only check roles via `[Authorize]` - no custom logic
   - Consistent role extraction across all endpoints
   - Easier to unit test (mock ClaimsPrincipal with roles already set)

### Testing Patterns

- **TDD Workflow**:
  1. Write test → Run test (FAIL) → Implement feature → Run test (PASS)
  2. All 5 tests FAILED initially ✓ (expected before implementation)
  3. Implementation complete but tests cannot rerun (Infrastructure errors)

- **Test Token Factory Method**:
  ```csharp
  private string CreateTestJwtToken(string username, string clubId, string role)
  {
      var clubsDict = new Dictionary<string, string> { [clubId] = role };
      var claims = new[] {
          new Claim(JwtRegisteredClaimNames.Sub, username),
          new Claim("clubs", JsonSerializer.Serialize(clubsDict)),
          // ... more claims
      };
      // Sign and return JWT string
  }
  ```

- **Integration Test Structure**:
  - Arrange: Create client, add auth header, add tenant header
  - Act: Send HTTP request (GET/POST/DELETE)
  - Assert: Verify status code (200/401/403)

### Security Considerations

1. **RequireHttpsMetadata = false**: Only for development. Production MUST use HTTPS.
2. **Symmetric test tokens**: Integration tests use HMAC-SHA256. Production uses RSA asymmetric keys (Keycloak).
3. **Claims validation**: Always validate tenant membership before role extraction (prevent privilege escalation).
4. **Health endpoint security**: Public by default (no auth). Consider restricting `/health/ready` in production (exposes DB status).
5. **Token lifetime**: Validate expiration (`ValidateLifetime: true`) to prevent token replay attacks.

### Gotchas to Avoid

1. **Do NOT skip claims transformation registration**: `builder.Services.AddScoped<IClaimsTransformation, ClubRoleClaimsTransformation>()`
2. **Do NOT put authorization before authentication**: Middleware order is critical
3. **Do NOT use `[Authorize(Roles = "admin")]`**: Case mismatch with Keycloak (lowercase) vs ASP.NET (PascalCase)
4. **Do NOT add database calls in ClaimsTransformation**: Runs on EVERY request - performance critical
5. **Do NOT forget X-Tenant-Id header**: ClaimsTransformation depends on it to extract role from `clubs` claim

### Dependencies on Other Tasks

- **Task 3 (Keycloak Realm)**: Provides JWT issuer, `clubs` claim structure
- **Task 7 (EF Core DbContext)**: `AppDbContext` used for health checks
- **Task 8 (Finbuckle Middleware)**: Provides tenant resolution (BLOCKS Task 9 due to compilation errors)
- **Future Task 14-16 (CRUD Endpoints)**: Will use authorization policies defined here

### Next Steps (Future Tasks)

1. **Fix Infrastructure compilation errors** (Task 8 follow-up):
   - Resolve `IMultiTenantContextAccessor` type resolution
   - Fix `TenantProvider` compilation errors
   - Re-run integration tests to verify PASS status

2. **Add policy enforcement to CRUD endpoints** (Tasks 14-16):
   - Task CRUD: `RequireMember` (create/update), `RequireViewer` (read)
   - Shift CRUD: `RequireManager` (create/update), `RequireViewer` (read)
   - Club CRUD: `RequireAdmin` (all operations)

3. **Add role-based query filtering**:
   - Viewers can only read their assigned tasks
   - Members can read/write their tasks
   - Admins can see all tasks in club

4. **Production hardening**:
   - Set `RequireHttpsMetadata: true`
   - Add rate limiting on authentication endpoints
   - Implement token refresh flow (refresh tokens from Keycloak)
   - Add audit logging for authorization failures

### Evidence & Artifacts

- Implementation status: `.sisyphus/evidence/task-9-implementation-status.txt`
- Integration tests: `backend/WorkClub.Tests.Integration/Auth/AuthorizationTests.cs`
- Claims transformation: `backend/WorkClub.Api/Auth/ClubRoleClaimsTransformation.cs`

### Build Status

- **API Project**: ❌ Does not compile (dependencies on Infrastructure)
- **ClaimsTransformation**: ✅ Compiles successfully (standalone)
- **Authorization Tests**: ✅ Code is valid, cannot execute (Infrastructure errors)
- **Health Checks Configuration**: ✅ Syntax correct, cannot test (app won't start)



---

## Task 12 Continuation: Resolving Pre-existing Build Errors (2026-03-03)

### Issue Discovery

When attempting to run the smoke test for Task 12, encountered build errors in `WorkClub.Api/Program.cs`:

```
error CS0246: Der Typ- oder Namespacename "TenantInfo" wurde nicht gefunden
error CS1061: "IServiceCollection" enthält keine Definition für "AddMultiTenant"
error CS1061: "WebApplication" enthält keine Definition für "UseMultiTenant"
```

### Root Cause Analysis

1. **Missing Package Reference**:
   - `WorkClub.Api.csproj` had `Finbuckle.MultiTenant.AspNetCore` (version 10.0.3)
   - Missing `Finbuckle.MultiTenant` base package (required for `TenantInfo` type)
   - Infrastructure project had both packages, API project incomplete

2. **Package Dependency Chain**:
   - `Finbuckle.MultiTenant.AspNetCore` depends on `Finbuckle.MultiTenant`
   - But transitive dependency not resolved automatically in .NET 10
   - Explicit reference required for types used directly in code

### Resolution

**Added missing package**:
```bash
cd backend/WorkClub.Api
dotnet add package Finbuckle.MultiTenant --version 10.0.3
```

**WorkClub.Api.csproj now includes**:
```xml
<PackageReference Include="Finbuckle.MultiTenant" Version="10.0.3" />
<PackageReference Include="Finbuckle.MultiTenant.AspNetCore" Version="10.0.3" />
```

### Pre-existing vs Task-Specific Issues

**NOT caused by Task 12**:
- Program.cs was created in earlier tasks (Tasks 7-11)
- Multi-tenancy configuration added before package dependencies verified
- Task 12 only creates test infrastructure (no Program.cs modifications)

**Discovered during Task 12**:
- Smoke test execution requires full API project build
- Build errors prevented test verification
- Fixed proactively to unblock smoke test

### Dependency Resolution Pattern

**Lesson learned**: When using types from NuGet packages directly in code:
1. Check if type is in transitive dependency (may not auto-resolve)
2. Add explicit `<PackageReference>` for packages you directly use
3. Verify build after adding multi-tenant or complex package chains

**Finbuckle.MultiTenant package structure**:
- `Finbuckle.MultiTenant` → Core types (TenantInfo, ITenant, etc.)
- `Finbuckle.MultiTenant.AspNetCore` → ASP.NET Core extensions (AddMultiTenant, UseMultiTenant)
- Both required for typical ASP.NET Core integration

### Build Verification After Fix

**Command**: `dotnet build WorkClub.Api/WorkClub.Api.csproj`

**Result**: ✅ SUCCESS
- All projects compile successfully
- TenantInfo type resolved
- AddMultiTenant extension method found
- UseMultiTenant extension method found
- Only warnings: EF Core version conflicts (10.0.0 vs 10.0.3) → non-breaking

**Warnings present** (acceptable):
```
warning MSB3277: Konflikte zwischen verschiedenen Versionen von "Microsoft.EntityFrameworkCore.Relational"
```
- Infrastructure uses EF Core 10.0.3 (from Npgsql.EntityFrameworkCore.PostgreSQL)
- API has transitive dependency on 10.0.0
- Build system resolves to 10.0.3 (higher version wins)
- No breaking changes between 10.0.0 and 10.0.3

### Impact on Task 12 Status

**Before fix**:
- Test infrastructure code: ✅ Complete (5 files, 171 lines)
- Smoke test: ❌ Cannot run (API build fails)
- Task 12 deliverable: Blocked

**After fix**:
- Test infrastructure code: ✅ Complete
- API project build: ✅ Success
- Smoke test: Ready to execute
- Task 12 deliverable: Unblocked

### Gotchas for Future Tasks

1. **Don't assume transitive dependencies**: Always add explicit `<PackageReference>` for types you use
2. **Multi-tenant packages need both**: Base + AspNetCore packages for full functionality
3. **Test early**: Build errors surface faster when running tests immediately after implementation
4. **Version alignment**: Use same version across package family (e.g., all Finbuckle packages at 10.0.3)

### Evidence

- Build output before fix: Pre-existing errors in Program.cs (TenantInfo, AddMultiTenant, UseMultiTenant)
- Package addition: `Finbuckle.MultiTenant` 10.0.3 added to WorkClub.Api.csproj
- Build output after fix: Successful compilation, only version conflict warnings

---

---

## Task 10: Auth.js v5 Installation & Configuration (2026-03-03)

### Key Learnings

1. **Auth.js v5 Installation**
   - Package: `next-auth@beta` (5.0.0-beta.30) + `@auth/core` (0.34.3)
   - Installed via `bun add next-auth@beta @auth/core` in 786ms
   - Note: Beta version required for Next.js 15+ compatibility
   - No peer dependency warnings or conflicts

2. **Keycloak Provider Configuration**
   - Import: `import KeycloakProvider from "next-auth/providers/keycloak"`
   - Required env vars: `KEYCLOAK_CLIENT_ID`, `KEYCLOAK_CLIENT_SECRET`, `KEYCLOAK_ISSUER`
   - Issuer format: `http://localhost:8080/realms/workclub` (must match Task 3 realm)
   - Client secret not needed for public client but Auth.js requires it (placeholder value works)

3. **TypeScript Module Augmentation**
   - Extend `next-auth` module to add custom Session/JWT properties
   - **CRITICAL**: JWT interface must be declared INSIDE `next-auth` module (not separate `next-auth/jwt`)
   - Reason: `next-auth/jwt` module doesn't exist in v5 (causes build error)
   - Pattern:
     ```typescript
     declare module "next-auth" {
       interface Session { ... }
       interface JWT { ... }
     }
     ```

4. **JWT Callback: Custom Claims Extraction**
   - Callback: `async jwt({ token, account })` runs on sign-in
   - Account object contains access_token from Keycloak
   - Extract custom `clubs` claim: `token.clubs = (account as any).clubs || {}`
   - Store access_token for API calls: `token.accessToken = account.access_token`
   - Type assertion required: `(account as any)` due to Auth.js v5 type limitations

5. **Session Callback: Client Exposure**
   - Callback: `async session({ session, token })` runs on session fetch
   - Maps JWT claims to session object for client-side access
   - Type safety: cast token properties with `as Record<string, string> | undefined`
   - Pattern:
     ```typescript
     session.user.clubs = token.clubs as Record<string, string> | undefined
     session.accessToken = token.accessToken as string | undefined
     ```

6. **Environment Variable Updates**
   - Updated `.env.local.example` with better guidance:
     - `NEXTAUTH_SECRET`: Now explicitly says "generate-with-openssl-rand-base64-32"
     - `KEYCLOAK_CLIENT_SECRET`: Changed placeholder to "not-needed-for-public-client"
   - Pattern: Use `.env.local.example` as template, copy to `.env.local` for actual values

7. **Auth.js v5 Export Pattern**
   - Export: `export const { handlers, signIn, signOut, auth } = NextAuth({ ... })`
   - `handlers`: For API route `/app/api/auth/[...nextauth]/route.ts` (created in Task 18)
   - `signIn/signOut`: Functions for triggering auth flows
   - `auth`: Middleware and server-side session access
   - Re-export from `src/auth/index.ts` for clean imports

8. **Build Verification with Turbopack**
   - Next.js 16.1.6 with Turbopack compiles in ~2.5s
   - TypeScript type checking runs separately after compilation
   - Static page generation: 4 pages generated (/, _not-found)
   - Exit code 0 confirms no TypeScript errors or build failures

9. **LSP Server Absence**
   - `lsp_diagnostics` tool failed: `typescript-language-server` not installed
   - Not critical: `bun run build` already validates TypeScript
   - LSP provides IDE support, but build step is authoritative
   - Future: Install with `npm install -g typescript-language-server typescript`

### Files Created

- `frontend/src/auth/auth.ts` (46 lines) — NextAuth config with Keycloak provider
- `frontend/src/auth/index.ts` (1 line) — Clean exports

### Files Modified

- `frontend/.env.local.example` — Updated NEXTAUTH_SECRET and KEYCLOAK_CLIENT_SECRET placeholders
- `frontend/package.json` — Added next-auth@5.0.0-beta.30 and @auth/core@0.34.3

### Patterns & Conventions

1. **Auth Configuration Location**: `src/auth/auth.ts` (not `lib/auth.ts`)
   - Reason: Authentication is core enough to warrant top-level directory
   - Export from `src/auth/index.ts` for `import { auth } from '@/auth'`

2. **Type Safety in Callbacks**: Use explicit type assertions
   - Account object: `(account as any)` for custom claims
   - Token properties: `as Record<string, string> | undefined` when assigning to session

3. **Environment Variable Naming**:
   - `NEXTAUTH_*`: Auth.js-specific config
   - `KEYCLOAK_*`: Identity provider config
   - `NEXT_PUBLIC_*`: Client-exposed variables (not used here)

4. **Comments in Integration Code**: Integration-specific comments are necessary
   - Auth callbacks are not self-documenting (need context)
   - Clarify: "Add clubs claim from Keycloak access token"
   - Clarify: "Expose clubs to client"

### Build Results

- **Compilation**: ✓ 2.5s (Turbopack)
- **TypeScript**: ✓ No errors
- **Static Generation**: ✓ 4 pages in 241ms
- **Exit Code**: ✓ 0

### Common Pitfalls Avoided

1. **Module Augmentation Error**: Did NOT create separate `declare module "next-auth/jwt"` (causes build failure)
2. **Type Safety**: Did NOT omit type assertions in session callback (causes TypeScript errors)
3. **Environment Variables**: Did NOT hardcode secrets in code
4. **Client Secret**: Did NOT remove KEYCLOAK_CLIENT_SECRET env var (Auth.js requires it even for public clients)

### Next Steps

- **Task 18**: Create middleware.ts for route protection
- **Task 18**: Create auth route handler `/app/api/auth/[...nextauth]/route.ts`
- **Task 18**: Add SessionProvider wrapper in layout
- **Task 19**: Create useActiveClub() hook (local storage for active tenant)
- **Task 20**: Create API fetch utility (add Authorization + X-Tenant-Id headers)

### Integration Points

- Depends on Task 3 (Keycloak realm with workclub-app client)
- Depends on Task 5 (Next.js scaffold with TypeScript)
- Blocks Task 18 (Layout + authentication UI)
- Blocks Task 19 (useActiveClub hook)
- Blocks Task 20 (API fetch utility)

### Evidence & Artifacts

- Build output: `.sisyphus/evidence/task-10-build.txt` (if needed)
- Auth config: `frontend/src/auth/auth.ts` (committed)


## Task 8: Finbuckle Multi-Tenant Middleware + Tenant Validation (2026-03-03)

### Key Learnings

1. **Finbuckle MultiTenant Version Compatibility with .NET 10**
   - Finbuckle.MultiTenant version 10.0.3 NOT compatible with .NET 10 (extension methods missing)
   - Downgraded to version 9.0.0 across all projects (Application, Infrastructure, Api)
   - Version 9.0.0 fully compatible with .NET 10.0
   - Package reference alignment critical: all 3 projects must use same Finbuckle version
   - NuGet will auto-resolve to 9.0.0 even if 8.2.0 specified

2. **Finbuckle API Changes Between Versions**
   - Version 9.x uses `Finbuckle.MultiTenant` namespace (no `.Extensions` sub-namespace)
   - `using Finbuckle.MultiTenant;` is sufficient for all extension methods
   - Do NOT use: `using Finbuckle.MultiTenant.Extensions;` (doesn't exist in 9.x)
   - Do NOT use: `using Finbuckle.MultiTenant.AspNetCore.Extensions;` (doesn't exist in 9.x)
   - `IMultiTenantContextAccessor<TenantInfo>` is typed generic (not untyped interface)

3. **ASP.NET Core Framework Reference for Class Libraries**
   - Class library projects needing ASP.NET Core types must add `<FrameworkReference Include="Microsoft.AspNetCore.App" />`
   - This replaces explicit PackageReference to `Microsoft.AspNetCore.Http.Abstractions`
   - .NET 10: version 10.0.0 of AspNetCore.Http.Abstractions doesn't exist (use framework reference instead)
   - Pattern: PackageReference for libraries, FrameworkReference for framework types

4. **TDD Red-Green-Refactor Success**
   - Tests written FIRST before any implementation (4 scenarios)
   - Red phase: Tests FAIL as expected (middleware not implemented)
   - Implemented all code (middleware, provider, interface)
   - Green phase: ALL 4 TESTS PASS on first run after enabling middleware
   - No refactoring needed (clean implementation)

5. **Middleware Order is CRITICAL**
   - Correct order: `UseAuthentication()` → `UseMultiTenant()` → `TenantValidationMiddleware` → `UseAuthorization()`
   - ClaimStrategy requires authentication to run first (needs HttpContext.User populated)
   - TenantValidationMiddleware must run after UseMultiTenant (needs Finbuckle context)
   - Changing order breaks tenant resolution or validation logic

6. **Tenant Validation Middleware Pattern**
   - Extract clubs claim from JWT: `httpContext.User.FindFirst("clubs")?.Value`
   - Parse clubs as JSON dictionary: `JsonSerializer.Deserialize<Dictionary<string, string>>(clubsClaim)`
   - Extract X-Tenant-Id header: `httpContext.Request.Headers["X-Tenant-Id"]`
   - Validate match: `clubsDict.ContainsKey(tenantId)`
   - Return 400 if header missing, 403 if not member of tenant, pass through if valid
   - Unauthenticated requests skip validation (handled by UseAuthorization)

7. **ITenantProvider Service Pattern**
   - Interface in Application layer (WorkClub.Application/Interfaces/ITenantProvider.cs)
   - Implementation in Infrastructure layer (WorkClub.Infrastructure/Services/TenantProvider.cs)
   - Dependencies: `IMultiTenantContextAccessor<TenantInfo>`, `IHttpContextAccessor`
   - Methods:
     - `GetTenantId()`: Returns current tenant ID from Finbuckle context
     - `GetUserRole()`: Parses clubs claim to extract role for current tenant
   - Registered as scoped service: `builder.Services.AddScoped<ITenantProvider, TenantProvider>()`

8. **Integration Test Setup with Custom Web Application Factory**
   - `CustomWebApplicationFactory` overrides connection string via `ConfigureAppConfiguration`
   - InMemoryCollection provides test connection string from Testcontainers
   - Configuration override applied BEFORE Program.cs reads config
   - Conditional healthcheck registration: only add NpgSql check if connection string exists
   - Test factory starts Testcontainers BEFORE app configuration

9. **Test Scenarios for Tenant Validation**
   - Valid tenant request: User with clubs claim matching X-Tenant-Id → 200 OK
   - Cross-tenant access: User with clubs claim NOT matching X-Tenant-Id → 403 Forbidden
   - Missing header: Authenticated user without X-Tenant-Id header → 400 Bad Request
   - Unauthenticated: No auth token → 401 Unauthorized (handled by UseAuthorization)

### Files Created

- `backend/WorkClub.Tests.Integration/Middleware/TenantValidationTests.cs` — Integration tests (4 scenarios, all passing)
- `backend/WorkClub.Application/Interfaces/ITenantProvider.cs` — Service interface
- `backend/WorkClub.Infrastructure/Services/TenantProvider.cs` — Service implementation
- `backend/WorkClub.Api/Middleware/TenantValidationMiddleware.cs` — Validation middleware

### Files Modified

- `backend/WorkClub.Api/Program.cs`:
  - Added Finbuckle configuration with HeaderStrategy, ClaimStrategy, InMemoryStore
  - Registered ITenantProvider service
  - Added middleware: UseMultiTenant() and TenantValidationMiddleware
  - Made healthcheck registration conditional (only if connection string exists)
  - Added test endpoint `/api/test` for integration testing

- `backend/WorkClub.Infrastructure/WorkClub.Infrastructure.csproj`:
  - Added `<FrameworkReference Include="Microsoft.AspNetCore.App" />`
  - Updated Finbuckle.MultiTenant to version 9.0.0
  - Updated Finbuckle.MultiTenant.AspNetCore to version 9.0.0

- `backend/WorkClub.Application/WorkClub.Application.csproj`:
  - Updated Finbuckle.MultiTenant to version 9.0.0

- `backend/WorkClub.Api/WorkClub.Api.csproj`:
  - Updated Finbuckle.MultiTenant.AspNetCore to version 9.0.0

- `backend/WorkClub.Tests.Integration/Infrastructure/CustomWebApplicationFactory.cs`:
  - Added configuration override for connection string

### Test Results

- **Test Execution**: 4/4 PASSED (100%)
- **Duration**: 318ms total test run
- **Scenarios**:
  - ✓ Request_WithValidTenantId_Returns200
  - ✓ Request_WithNonMemberTenantId_Returns403
  - ✓ Request_WithoutTenantIdHeader_Returns400
  - ✓ Request_WithoutAuthentication_Returns401

### Build Verification

- All 5 projects build successfully (Domain, Application, Infrastructure, Api, Tests.Integration)
- 0 errors, only BouncyCastle security warnings (expected for test dependencies per Task 1)
- LSP diagnostics: N/A (csharp-ls not in PATH, but dotnet build succeeded with 0 errors)

### Evidence Files Created

- `.sisyphus/evidence/task-8-red-phase.txt` — TDD red phase (tests failing as expected)
- `.sisyphus/evidence/task-8-green-phase-success.txt` — TDD green phase (tests passing)
- `.sisyphus/evidence/task-8-valid-tenant.txt` — Valid tenant scenario test output
- `.sisyphus/evidence/task-8-cross-tenant-denied.txt` — Cross-tenant denial test output
- `.sisyphus/evidence/task-8-missing-header.txt` — Missing header test output

### Architecture Patterns

1. **Middleware composition**: UseAuthentication → UseMultiTenant → TenantValidationMiddleware → UseAuthorization
2. **Service registration**: ITenantProvider registered before AddAuthentication
3. **Finbuckle strategies**: WithHeaderStrategy("X-Tenant-Id") + WithClaimStrategy("tenant_id")
4. **InMemoryStore**: Used for development (no persistent tenant data yet)
5. **Test authentication**: TestAuthHandler replaces JWT validation in tests

### Gotchas Avoided

- Did NOT use Finbuckle 10.x (incompatible with .NET 10)
- Did NOT forget to uncomment middleware registration (lines 79-80 in Program.cs)
- Did NOT use untyped `IMultiTenantContextAccessor` (must be `IMultiTenantContextAccessor<TenantInfo>`)
- Did NOT add PackageReference for AspNetCore.Http.Abstractions (used FrameworkReference instead)
- Did NOT skip version alignment (all Finbuckle packages at 9.0.0)

### Next Steps (Task 7 Completion)

- Task 8 groups with Task 7 for a single commit
- Commit message: `feat(data): add EF Core DbContext, migrations, RLS policies, and multi-tenant middleware`
- Pre-commit hook will run: `dotnet test backend/WorkClub.Tests.Integration --filter "Migration|Rls|TenantValidation"`
- All tests must pass before commit

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