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InfluxDB
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You have to think that Nautilus Annotations has been born as an extension for writing text annotations and emblems are a recent addition; they are very welcomed by they must not twist the extension's mission. However with that in mind I released the emblem picker widget in an independent library, so that anyone can re-use it and write a more or less specialized extension based on their needs.
I don't know what you mean with “modern Adwaita styling”. The extension uses libadwaita, and if you have good ideas to propose, the emblem picker is styled by a very small CSS everyone is welcome to contribute to.
Such time-based information/TODOs are much better stored in a task manager (such as https://useplanner.com/), with an automated notification reminder that alerts you on the date, so that you don't have to think about it until it reminds you.