An underused option is actually SQLite. That gives you a surprisingly feature-rich system with very low overhead. In fact, you may see benefits: faster access a

An underused option is actually SQLite. That gives you a surprisingly feature-rich system with very low overhead. In fact, you may see benefits: faster access and less disk usage https://www.sqlite.org/fasterthanfs.html https://www.sqlite.org/fasterthanfs.html A key-value store would probably work well, depending on how well its storage layer is architected.