Node name is quoted string

[matsimitsu]

The node_name ends up as a quoted string in the database:

staging :) select * from metrics.kubernetes_metrics_minutely order by timestamp desc limit 1 format Vertical;

SELECT *
FROM metrics.kubernetes_metrics_minutely
ORDER BY timestamp DESC
LIMIT 1
FORMAT Vertical

Query id: a8879bb4-27ff-4e8c-b002-bf6d38f7a6ba

Row 1:
──────
site_id:                           66e1668b855cad96c9ed08b8
timestamp:                         2025-01-08 11:12:12
node_name:                         "docker-desktop"
pod_name:                          kube-proxy-hzq5v
pod_namespace:                     kube-system
pod_uuid:                          20502936-2ed5-43ed-917e-ea03d28531ce