Let's say that the concept/entity "Amsterdam" was attached to an annotation with a media fragment ranging from 00:18:00 to 00:18:30. The editor likes this concept, but wants to make sure the information in the/a front-end is visible from 00:17:30 to 00:19:00.
Question: how will can we reflect this editor's decision in the model?
My suggestion would be to create a new annotation & media fragment (in turn relating to the relevant shot mediafragment)? The newly created annotation of course has the provenance directing to the ET. Also the annotation would point to the concept/entity (annotation body) "Amsterdam".
(With this approach you'd simply say that an editor makes custom annotations based on an existing (automatically detected) concept)