Design DB for persisting user reviews

[mamadi]

User reviews need to be stored in a way that later they can efficiently be averaged for average ratings.

[mamadi]

Graph Database:

• Graph DB: http://neo4j.com/developer/graph-database/
• Graph DB, relational and nosql: http://neo4j.com/developer/graph-db-vs-nosql/
• Data modeling: http://neo4j.com/developer/guide-data-modeling/