There has been earlier work on getting git-style branched versioning on top of databases. For relational databases, OrpheusDB (http://orpheus-db.github.io/ htt

There has been earlier work on getting git-style branched versioning on top of databases. For relational databases, OrpheusDB (http://orpheus-db.github.io/ http://orpheus-db.github.io/) puts a layer over PostgreSQL. They also supply a gRPC layer for interacting with the server. For key-value systems, there are simple techniques for adding branched versioning to key-value (particularly ordered key-value) stores. We are using it for our research dataservice that holds 25+ TB of Connectomics data, which includes 3d image and segmentation data (http://dvid.io http://dvid.io). Our paper is currently under review but should have been out several years ago :) We can use a variety of key-value storage backends and are experimenting with versioned relational DBs, so I'll definitely give LiteTree a look.