I have been working with timeseries data since 2007, started using rrdtool, used HDF for storing pandas dataframes and have been looking for timeseries database for many years. Despite having every time more to choose from the only one that made and still makes me happy is QuestDB. It is the perfect match for my use case - storing performance data.
Using HDF I was only able to analyze after some processing steps and always needed to be careful to not corrupt the storage files. This is now history! A lot easier handling, performant, real time. QuestDB is a charm to work with!
Thank you very much for this amazing tool!