[1] https://postgres.heroku.com/blog/past/2012/1/31/simple_data_...
If you're already using Heroku Postgres there's a ton of overlap between the services, but I'm hoping to provide a decent open source alternative for the rest of us. :)
Also, this is my first attempt at providing a live demo of software that can execute arbitrary SQL. I'm probably crazy for doing this, but I thought it was a lot more interesting than doing a video. If the demo suddenly disappears, you'll know I wasn't able to harden it enough... :)
If I get it to work, I'll pass along whatever info I learn in the process.
As for the demo, it's isolated, and locked down as well as MySQL will allow. (For starters, just SELECT privileges.)