Is Kuler SQL Still Being Developed?

I’m confused. In a post from Aug 2015 someone mentions using an SQL Base Pro stack to do a custom query but here you state that we can’t. I’d like to get the Kuler SQL stack but it’ll only be useful for me if I can use a WHERE clause in the SELECT.
(I searched for and couldn’t find any documentation on the SQL stacks—I did find a few examples on vimeo but they appear to not use WHERE clauses.)