RDBMSでよくね?
本1冊ぐらい読んで判断してください
https://neo4j.com/book-graph-databases/
http://www.allthingsdistributed.com/2015/08/titan-graphdb-integration-in-dynamodb.html
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.