Entity resolution after 2 weeks get lower

Hi,
I have the problem, that the resolution of my variables is getting more “coarse” after 2 weeks or so. For example I read out the temperatures of my heater every 1 min. It all runs fine, but if I want to see measurements older then 2 or 3 weeks the resolution is not 1 min anymore, its 1 hr per measurement. How can I disable this ?
Are all my older measurements now only 1hr resolution ? Can i get the old resolution back or are the values gone ?

The data has moved into LTS. That’s how it works…
If you want to store data forever, install influxDB and store it away from the moment to moment database that HA uses to keep your transactions and actions quick