Heat generator statistics DPF/MPF/SPF missing state_class

[triplef]

The problem

I believe the following entities are missing state_class: measurement. This causes them to be shown as a bar with discrete values instead of a graph, which at least for the day/month values would be helpful to see the efficiency over time.

• sensor.statistics_heat_generator_1_dpf_previous_day
• sensor.statistics_heat_generator_1_mpf_current_month
• sensor.statistics_heat_generator_1_spf_current_year
• sensor.statistics_heat_generator_1_spf_previous_year
• sensor.statistics_heat_generator_1_spf_year_before_last

What version of Home Assistant Core has the issue?

core-2025.12.4

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

wolflink

Link to integration documentation on our website

https://www.home-assistant.io/integrations/wolflink/

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response

[home-assistant[bot]]

Hey there @adamkrol93, @mtielen, mind taking a look at this issue as it has been labeled with an integration (wolflink) you are listed as a code owner for? Thanks!

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[triplef]

@EnjoyingM is that something you could help with? 🙏 I saw that you corrected the units of other Wolflink entities in the past.