How to set the scan interval of entities derived from helpers and statistics platform?

I fairly new to HA, and after a couple of month have also arrived at the point where I need to do something against the growth of the database. Reducing the number of recorded entities helped, but I need to address the entities with the highest update rates as well.
I am aware how to set the scan interval for template sensors and the „disable polling“ + automation method, but I could not find the approach for entities created by helpers or by the statistics platform.
Any help would be appreciated.