Is it being used in production anywhere, even if only a toy app?

I know you say it's not production ready and not optimized yet, but in the same breath - in your comment here - you say it's already faster.

It's not used in production. I've been using different benchmarks to compare the performance vs other systems. Namely sysbench-tpcc[0] and clickbench[1]

[0] https://github.com/Percona-Lab/sysbench-tpcc

[1] https://github.com/ClickHouse/ClickBench