Exclude motion info from Hue Outdoor Motion sensor

I have a home_assistant_v2.db on a size of close to 2 GB now and growing. To 99% certainty the size is due to that my Hue Outdoor sensor see too much. I dont use the motion sensor at all, only the lux value from the sensor, so I want to exclude the info from the motion part in my database. How is this possible?