* reorganize FS configuration
  * create mountpoint configuration structs
* refactor FS pool managers
  * create zfs and lvm filesystem managers
* retrieval pool rotation
  * detect the next pool to update
  * pool switching
  * reload service configuration
* running an actual retrieval chain
  * reproduce retrieval job execution
* running a refresh scheduler
  * create a timetable
  * cancel nested snapshot schedulers
* cloning with different fs pools
  * provide fs managed pools to the cloning service
  * adopt cloning operations
* idle timeouts
  * detect clone idleness for all managed pools