Adjustable, versioned graph database

Question

I\'m currently working on a project where I use natural language processing to extract emotions from text to correlate them with contextual information.

Definition o

Answer 1

There's a database called Datomic by Rich Hickey (of Clojure fame) that stores facts over time. Every entry in the database is a fact with a timestamp, append-only as in Event Sourcing.

These facts can be queried with a relational/logical language ala Datalog (remiscent of Prolog). Please see This post by kisai for a quick overview. It has been used for querying graphs with some success in the past: Using Datomic as a Graph Database.

While I have no experience with Datomic, it does seem to be quite suitable for your particular problem.