I have deleted them on startup. It took almost one hour 17:04:21-17:59:54 at a rate of ~167 records per second.
I can see in the 2023-07-23 version it's probably fixed.
I would like to know what BackgroundHALShouldPause does, and how to use it. While it's listed in the HAL Primitives report, it is not used in source code and it doesn't appear in the LMS HAL...