Template Sensor does not have Long Term Storage

I’ve created a sensor in yaml using template integration, with a state_class and unit_of_measurement. However the data does not go into long-term-storage. Data from other sensors, like a Zigbee temperature sensor, do go into LTS, so I do not think it is a problem with the record/history integration itself.

What change do I need to make to have my sensor data go into LTS?

Below I’ve attached my configuration.

heatpump_package.yaml:

template:
  - sensor:
      name: "Ecodan Daily COP"
      unique_id: "ecodan_dailycop"
      state: "{{ ((state_attr('sensor.ecodan', 'DailyHeatingEnergyProduced')|float) / (state_attr('sensor.ecodan', 'DailyHeatingEnergyConsumed')|float)) | round(2) }}"
      availability: "{{ (state_attr('sensor.ecodan', 'DailyHeatingEnergyProduced')|is_number) and (state_attr('sensor.ecodan', 'DailyHeatingEnergyConsumed')|is_number) }}"
      unit_of_measurement: "x"
      state_class: measurement

configuration.yaml:

# Loads default set of integrations. Do not remove.
default_config:

# Load frontend themes from the themes folder
frontend:
  themes: !include_dir_merge_named themes

# Text to speech
tts:
  - platform: google_translate

automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml

homeassistant:
  packages:
    melcloud_package: !include melcloud_package.yaml
    heatpump_package: !include heatpump_package.yaml

History: LTS works for some sensors, but not the template sensor

I’m on the latest version of HomeAssistant:

• Core 2025.3.1
• Supervisor 2025.03.2
• Operating System 14.2
• Frontend 20250306.0

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