Sure! It's really just a Go wrapper around LevelDB. LevelDB is an in process database (like SQLite) written in C++. It's a key value store where the keyspace is ordered (so you can do range scans).

However, we've written enough code around it to turn it into a scalable distributed time series database with a pubsub layer built in. It does rollups on the fly or can preemtively downsample data coming in. We're actually working on a new version of it that we intend to open source at the end of the year.