update backend network

backend/redis/compose.yml

@@ -15,12 +15,12 @@ services:
     env_file:
       - .env
     networks:
-      - db
+      - backend
     volumes:
     - redis_data:/data
 volumes:
   redis_data:
     name: redis_data
 networks:
-  db:
+  backend:
     external: true