I was investigating the same topic (PG based timeseries database) for a stock tick data project, would definitely give timescaledb a try.
Since financial data is mentioned in the blog, would be curious on how it performed / scaled in practical.
We're still preparing some benchmark numbers/performance numbers that we will hopefully share in the coming weeks. We do have some write performance numbers in there as you can see. There is also a lot of churn at the moment as we're still in beta and refining some key features, so I don't want to speculate too much on how performance looks until after we get a few more of our query optimizations tuned.