It’s a big day for Timescale, makers of the open source time series database, TimescaleDB. The company announced a $15 million investment and a new enterprise version of the product. The investment is technically an extension of the $12.4 million Series A it raised last January, which it’s referring to as A1. Today’s round is led by Icon Ventures with existing investors Benchmark, NEA and Two Sigma Ventures also participating.