I am also running a solo startup. Don't run your own database. It is an unwanted distraction and data loss due to poor backup procedures (i.e. do you actually test backup/restore) can often kill your startup before it has a chance to take off.

Plenty of great hosted database solutions e.g. AWS RDS (PostgreSQL, MySQL, Oracle), MongoLab, MongoHQ, Cloudant, Firebase, Azure etc.