Built a CSV for a lookup schema with ~800 servers, locations and racks:
Took 2-3 seconds to import.
Replicating what I used data's "datarelated" for also worked like charm.
No caching issues. Nice.
Still pondering maintenance.
Related enhancement issue #42:
support import from data
https://github.com/cosmocode/dokuwiki-plugin-struct/issues/42
A user-contributed approach is linked to in one of the comments there (zip, PHP).
Not tested.
Kind regards;
Kristin