Following a question from Tu-Tho, I realised that we have a lot of redundant key and unique constraint. That does not harm but when there is key my understanding is that you don't need the unique .
Probably to be cleaned at some point.
Also I can’t remember why the DataSourceRef_AnyKeyRef keyref has such a complicated selector (not sure this DataSourceRef_AnyKeyRef is necessary, the DataSource_AnyKeyRef looks sufficient)