I have not maintained WDQ (
http://wdq.wmflabs.org/) for many months. It
just keeps "ticking away", with the occasional restart required. Its data
is likely out of sync with Wikidata proper, and most of its functionality
is better served by SPARQL (
https://query.wikidata.org/).
So we (Tool Labs tech and I) want to shut it down over the next few months.
I did some previous analysis (
http://magnusmanske.de/wordpress/?p=410) and
it looks like WDQ is pretty much obsolete. The one thing people seem to
like about it is the simple syntax, but that doesn't alone seem to be a
valid reason to keep it around, especially with a converter (
https://tools.wmflabs.org/wdq2sparql/w2s.php) in place.
If there are other reasons to keep WDQ alive, please let me know ASAP!