Custom Reports (Duplicate, Favorite, Export)
Duplicate Custom Report
Create a personal copy of a report. The duplicate is always owned by the authenticated caller with visibility='private' regardless of the original's visibility. Works on shared reports too (lets a user fork a shared report into their own workspace).
Toggle Favorite
Toggle the `is_favorited` flag on a report. Only the owner can toggle favorites on their own report (returns 403 otherwise). The Favorites tab on the Reports Hub filters by this flag.
Export Custom Report
Export a saved custom report. The response is a streamed/binary download in the requested format.