I actually experimented with a "database" of sorts, a redis compatible server with replication, persistence and an extendable API. It was okay as a toy project

I actually experimented with a "database" of sorts, a redis compatible server with replication, persistence and an extendable API. It was okay as a toy project but never came close to redis performance, even when it only did ping/pong. Plus it had the issue of stop-the-world GC that was how Go worked back then. Not sure how well it would work today.