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This is a great project, very cool, but it is actually insane to me that CRUD is so apparently hard that Google Sheets is the best solution

What's old is new again: Filemaker Pro

The attractiveness of a spreadsheet comes in the display and the charts, etc.

For a serious database doing actual transactions, I'm not sure about the utility.

Yes, but these things like easy exposure of metrics, having a simple editable back end, these used to be table stakes for this sort of thing