A MySQL implementation that uses various weird backends to store the actual data (so anything except actual databases).
Basically a system where one writes an interface between MySQL queries, and some arbitrary (non-database) place to store and retrieve data.
Some ideas for initial interfaces:
- Embed data into jpegs and upload to imgur.
- Reddit comments and threads.
- A bunch of email accounts that send messages to each other.
- CSV files in Dropbox. (boring + obvious)