Enable UpdateWithModelBuilder to delete triples, too

[fkleedorfer]

Problem description

The UpdateWithModelBuilder does not support deletion. We do have the need for deletions during updates, and these go directly to the db. If the UpdateWithModelBuilder supported deletions, we could collect them and execute them in one db access.

Preferred solution

No response

Are you interested in contributing a solution yourself?

Yes

Alternatives you've considered

No response

Anything else?

I already have that. Will open a PR that contributes it.