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- Custom Next.js server starts MQTT listener on boot - Subscribes to zigbee2mqtt/Bodenfeuchte_1, stores soil_moisture in SQLite - API route /api/data returns last 6 hours of measurements - Frontend shows current value + Recharts line chart, auto-refresh every 60s - Dockerfile + docker-compose with persistent volume for SQLite DB Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>