TimescaleDB. Is. Dope.
Back in the bad ol’ days when I worked on transient astronomy, all my timeseries data fit in memory. I’d store it in a CSV and not give it a second thought. But if you want to build a web application that leverages timeseries data, that won’t fly. You might think “I can’t store my timeseries data in a relational database, I need to stand up a whole new database for my timeseries stuff and I need to learn a whole new tsdb system and blah blah blah…”