This is slightly off the mark as you can't edit data with this tool, but this past year I worked on building a tool for manipulating data from an rdbms in the browser using only clicks. It was an effort to get beyond traditional enterprise reporting frameworks, but more importantly it was my "learn Clojure by building something kinda useful" project. I have it hosted on Heroku here: http://efreportsdemo.herokuapp.com/

Since I mostly use this project for resume fodder, it only uses one dyno and could probably stand to be a bit more secure (my postgres db should probably be a "follower"). Tangentially, it really wouldn't be very difficult to get this to support multiple datasources - some even csv file based.