Please add also relational databases incl MySQL and Postgres (both work great for time series) and Cassandra itself. While also kairosdb, heroic, blueblood, haw

Please add also relational databases incl MySQL and Postgres (both work great for time series) and Cassandra itself. While also kairosdb, heroic, blueblood, hawkula are based on Cassandra, it can be used for time series as well.