[kh99]

I think you just need to call the function build_user_statistics(), which is in includes/function_databuild.php. I don't understand exactly what that update username function does, but I'm guessing that the reason it works for you is because the user dm calls build_user_statistics() at some point.

If you wanted to have it run periodically you could create a scheduled task. Look at the files in includes/cron, find a simple example, and copy it to a new file name. The code just needs to include includes/function_databuild.php and call build_user_statistics(). Then you can use the Schedule Task manager to add a new scheduled task and specify your new php file as the file to run.

If you could live with it running only once per hour you could create a plugin using hook cron_script_cleanup_hourly, which is run from the existing "Hourly Cleanup" task.