I'm working on my own solution for a while (about 3 years) - https://github.com/akumuli/Akumuli https://github.com/akumuli/Akumuli. One of the greatest things a

I'm working on my own solution for a while (about 3 years) - https://github.com/akumuli/Akumuli https://github.com/akumuli/Akumuli. One of the greatest things about it is that there is no need for preconfigured rollups. The storage is based on B+Tree and some aggregates are stored inside inner nodes of the tree.