Datomic is a highly scalable database system written in Java.
codeq is written in Clojure and performs a code-aware import of Git-hosted projects.
More than one repos can be stored in the same Datomic database.
Why use codeq? Because it will allow a developer to keep track of his Git projects and easily query for certain commits or branches. Using Datomic also means the Git repos can be tracked more easier and integrated with more powerful applications and programming languages that don't have extended support for the Git protocol.