or like https://github.com/ciju/gotunnel?

The code is available at https://github.com/ciju/gotunnel

But it is better than not having the ability to change the schema when there are more than a few million rows, thanks to the enormous time taken

That's just a limitation of MySQL, not relational databases in general. In Postgres you can do it live in a transaction.

Schemaless would let you add/remove a field easily. What is hard is if you need to restructure things, which is also probably a more common occurence in a document db then a relational one. If you hit a few million rows, you are in for a world of hurt changing things in any data store

You don't, it is automagically being picked up from npm's couchdb repo. If it's on npm then it is on node-toolbox. If the module has some keywords then the chances are that it will get categorized correctly as well.

Darn, Looks like a bug with the Couchdb View. I'll fix it in a bit.