Recorder commit_interval

Hello
I have a serial connection with my powermeter and it send’s data every second,
Why is hassio updates home-assistant_v2.db every second with commit_interval 30?

recorder:
  commit_interval: 30
  include:
    entities:
      - sensor.my_powermeter_sensor_l1w
      - sensor.my_powermeter_sensor_l2w
      - sensor.my_powermeter_sensor_l3w
  purge_keep_days: 7

I delete logbook: from configuration.yaml
I fear for my sd card.
Thank You