I really like the idea of this kind of notebook which fetches, tidies and analyses data.
It also, importantly, exports the final data for use in other notebooks.
However, whenever another notebook uses that data, it has to re-run all the fetching and tidying of the data, and can’t guarantee that the data hasn’t changed or the data sources haven’t disappeared.
It would be useful if there was a way in a cell to say “write this data to a file attachment and export that as a versioned artifact”. Then, a way to import that versioned file attachment into another notebook. Also, a way to re-run the original fetching and processing scripts to generate a new version of the data.
As a bonus, it would be nice to be able to browse through different versions of the same dataset!
I realise that this is somewhat contrary to the general aim of Observable, which is a place to visualise and examine data that already exists, but it could also be useful as a place to gather and publish that data for use in other notebooks?