make listener robust to bad data

docker-compose.prod.yml

@@ -123,21 +123,18 @@ services:
       - infoscreen-net
 
   scheduler:
-    image: ghcr.io/robbstarkaustria/infoscreen-scheduler:latest  # Oder wo auch immer Ihre Images liegen
+    image: ghcr.io/robbstarkaustria/infoscreen-scheduler:latest
     container_name: infoscreen-scheduler
     restart: unless-stopped
     depends_on:
+      # HINZUGEFÜGT: Stellt sicher, dass die DB vor dem Scheduler startet
       db:
         condition: service_healthy
       mqtt:
         condition: service_healthy
     environment:
+      # HINZUGEFÜGT: Datenbank-Verbindungsstring
       DB_CONN: "mysql+pymysql://${DB_USER}:${DB_PASSWORD}@db/${DB_NAME}"
-      DB_USER: ${DB_USER}
-      DB_PASSWORD: ${DB_PASSWORD}
-      DB_NAME: ${DB_NAME}
-      DB_ROOT_PASSWORD: ${DB_ROOT_PASSWORD}
-      MQTT_BROKER_URL: mqtt
       MQTT_PORT: 1883
     networks:
       - infoscreen-net