This post reminds me of a product idea I've been pondering for a while: A versioned database backed by git.

It would only be useful for data that made sense to be represented in individual files (perhaps json files with the file name as the id), with an API that allowed the data to be accessed and written to in a similar way to other databases. Perhaps similar to a nosql database, but because it's in git, everything is versioned and can be reverted.