Ah, okay. Thanks Lydia.
I had seen that Stas was proposing to roll back the SPARQL data to
mid-April,
https://lists.wikimedia.org/pipermail/wikidata/2016-April/008618.html
but I didn't realise that was still in the pipeline.
If I am reading the bug correctly, it seems that a fix may now have been
found for the underlying problem, which should be deployed on Monday,
https://phabricator.wikimedia.org/T133924
so I guess that's implying the SPARQL database is now hoped to be
repaired after that, once there's a new dump to work from?