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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Emacs will soon be getting postgres interfacing via a module and will be getting SQLite Emacs team considering including SQLite : emacs
If you're looking for a fairly complicated quasi-relational example in emacs, you might check out the Vino wine database (https://github.com/d12frosted/vino), which is built on vulpea, which is a database-backed emacs package. The author recently launched another project on top of that, https://barberry.io/, which has a lot of the features you'd find in a complicated Notion workflow. But if Notion works for you, don't switch -- use whatever tools work best for you.