Do not log templated sensor, but show value graph

I have a DIY sensor, which sends ‘I am alive’ message every minute. As a part of this message it sends its uptime in minutes, just a number. What I would like to achieve with HA is:

  • Record the uptime value (maybe I’ll make a monitor for the uptime value reset which will notify me if it resets)
  • Show a human friendy text about the uptime

So, what I have so far:

  - platform: mqtt
    name: "Water meter: Uptime"
    unique_id: water_meter_uptime
    state_topic: "/ESP/Wemos/Water/Debug/Uptime"
    icon: mdi:av-timer
    unit_of_measurement: 'min'

  - platform: template
        friendly_name: "Water meter: Uptime"
        entity_id: sensor.water_meter_uptime
        value_template: >-
          {% set value = states('sensor.water_meter_uptime') | int %}
          {% set minutes = (value % 60) | int %}
          {% set hours = ((value / 60) % 24) | int %}
          {% set days = (value / 1440) | int %}
          {{ days }} days {{ hours }} hours {{ minutes }} minutes

There are a few issues with this approach:

  • water_meter_uptime_friendly sensor also updates every minute, it clutters the database with unnecessary records. Same for the logbook
  • I removed original uptime sensor number from the lovelace UI, but added only uptime_friendly value. It shows me a nice ‘1 days 19 hours 38 minutes’ string, but if I open details window it shows me an odd multicolor strip indicating values changed every minute’

So the question is: is there a way to templatize value only for UI, while keeping original value in the database and avoid adding additional template sensor?