docs: Phase 3 — Aufgaben 16-20 (Config, Errors, systemd, Health, DB)
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# Alicia — Aufgaben 16–20: BSN-Livesystem Phase 3 (Live-Vorbereitung)
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> **Repo:** `git@git.datenhimmel.work:danielkrause/BSN-Livesystem.git`
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> **Stand:** 15 Aufgaben fertig. Phase 2 abgeschlossen.
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> **Ziel:** Projekt live-fähig machen — Config, DB, Error-Handling, Service-Dateien.
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---
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## Aufgabe 16 — Konfigurations-Management (pydantic-settings)
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Ersetze hartcodierte Werte durch eine zentrale Config-Klasse.
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### Datei 1: `src/config.py`
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```python
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from __future__ import annotations
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from pydantic_settings import BaseSettings
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class Settings(BaseSettings):
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"""Zentrale Anwendungskonfiguration. Werte aus .env oder Environment."""
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REDIS_HOST: str = "localhost"
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REDIS_PORT: int = 6379
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WHATSAPP_APP_SECRET: str = ""
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WHATSAPP_VERIFY_TOKEN: str = "bsn_verify_token"
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TELEGRAM_BOT_TOKEN: str = ""
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APP_HOST: str = "0.0.0.0"
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APP_PORT: int = 5002
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APP_DEBUG: bool = False
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class Config:
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env_file = ".env"
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env_file_encoding = "utf-8"
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settings = Settings()
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```
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### Datei 2: `.env.template`
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```
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REDIS_HOST=localhost
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REDIS_PORT=6379
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WHATSAPP_APP_SECRET=dein_secret_hier
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WHATSAPP_VERIFY_TOKEN=bsn_verify_token
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TELEGRAM_BOT_TOKEN=dein_bot_token_hier
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APP_DEBUG=false
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```
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### Integration: `src/app.py` umbauen
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`from src.config import settings` — ersetze alle Hart-Konfigurationen.
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### Test: `tests/test_config.py` — 4 Tests
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**Commit:** `feat: Pydantic-Settings Konfiguration mit .env-Support`
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---
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## Aufgabe 17 — Einheitliche Fehlerbehandlung
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Zentrale JSON-Error-Responses via Flask errorhandler.
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### Datei: `src/error_handler.py`
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Handler für 400, 401, 404, 422 (ValidationError), 500.
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Alle Responses im Format: `{"error": "...", "message": "...", "status": N}`
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### Integration: `register_error_handlers(app)` in `create_app()`
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### Test: `tests/test_error_handler.py` — 5 Tests
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**Commit:** `feat: Einheitliche JSON-Error-Responses`
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---
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## Aufgabe 18 — systemd Service-Dateien
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### Dateien:
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- `deploy/bsn-chatbot.service` — Flask-App als systemd-Service
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- `deploy/bsn-worker.service` — Queue-Worker als systemd-Service
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- `deploy/README.md` — Installationsanleitung
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### Kein Test nötig (Konfigurationsdateien)
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**Commit:** `feat: systemd-Service-Dateien für Chatbot + Queue-Worker`
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---
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## Aufgabe 19 — Health-Check erweitern
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### Datei: `src/routes/health.py`
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Blueprint mit:
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- `GET /health` — Status, queue_size, python_version, platform
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- `GET /health/ready` — Readiness-Check (Redis-Verbindung)
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### Integration: `app.py`: inline `/health` entfernen, `health_bp` registrieren
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### Test: `tests/test_health.py` — 4 Tests
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**Commit:** `feat: Erweiterter Health-Check mit Readiness-Endpunkt`
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---
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## Aufgabe 20 — SQLAlchemy-Persistenz
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### Dateien:
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- `src/database.py` — Engine, Session, Base
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- `src/models/spiel.py` — SpielDB (SQLAlchemy-Modell)
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- `src/services/game_service.py` — Umbau auf DB-Sessions
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### Test: `tests/test_database.py` — 5 Tests
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**Commit:** `feat: SQLAlchemy-Datenbank mit SQLite-Persistenz`
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---
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## ⚠️ Wichtig
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- `pip install pydantic-settings sqlalchemy`
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- **Qualität:** `ruff check . && ruff format . && mypy --config-file pyproject.toml . && pytest -v`
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- **Reihenfolge:** 16 → 17 → 18 → 19 → 20
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