Currently the two batch-edit-post operations "normalize BibTeX key" and "update privacy" are implemented as regular post updates (i.e. the post is deleted and then freshly created in the updated version). Conversely the operation update Tags is updated in a more simple fashion. Please adapt the former two operations to a similar behavior - i.e. with more efficient database updates. For that purpose add further options to the enum PostUpdateOperation and implement the cases in updatePost accordingly.
Issue #1966 on hold