Find an event fires in case a course sections/subsections/units added or removed

I’m looking for an event that triggers every time a course staff/manager/creator… added or removed a section/subsection/unit to this course.
I saw this guide: https://github.com/openedx/edx-platform/blob/2dc79bcab42dafed2c122eb808cdd5604327c890/docs/guides/hooks/events.rst but it doesn’t have this feature. also signals like course_published is so general and doesn’t fit my needs.I’m working in nutmeg release.
Thanks