[abhishivsaxena]

I would disagree that referential integrity and schemas are the only issues a DB version control should focus on.

For example, I would be very interested in having git like branching on top of something like this - http://sandbox.substance.io/docs/lorem_ipsum.json. Basically version controlled schemaless object tree.

I recently implemented something like this, backed by mongodb, and by exposing a HTTP api which mimicked git. I had to relax these two requirements, but it is still worth it.

However I would be very much interested in using libgit2 with a database backend instead of filesystem.

EDIT: not affiliated with substance in any way.

[cbsmith]

You can implement a change DAG for a DB inside the DB. It works pretty well.

[tatalegma]

What is a change DAG?

[cbsmith]

A directed graph showing the dependencies between changes.