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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.
In the past I used CherryTree because it facilitates hierarchical note taking. However it has several drawbacks: it allows you to embed images/figures, but it becomes very slow over time as the XML file it writes to becomes larger and larger. It also has some other issues, like lack of support for including code snippets and LaTEX, and pretty counter-intuitive interface and limited import-export options.
Then I switched to Notable, which is great. It supports hierarchical note-taking using "notebook" tags, is blazing fast, and has everything I need. In addition, it stores everything as flat markdown files on your hard drive, no giant XML files or anything. It's great and it's been a tremendous productivity booster for me. It's also free.