Clearly the relational databases are very good and very useful in more cases than time series. However timeseries is huge, and growing - it's not a niche case a

Clearly the relational databases are very good and very useful in more cases than time series. However timeseries is huge, and growing - it's not a niche case anymore. Anyhow my beef was with the assertion that the 4 relational databases listed were the "only serious ones". This is completely untrue.