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> It's relatively easy to implement your own temporal tables on most existing databases

It gets tricky when you need to change the schema without breaking historical data or queries. SQL databases could do a lot more to make immutability easier and widespread.

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One fundamental issue I’ve noticed is that typical SQL databases have a single schema per table defining both the logical and physical aspects, typically with a strong correlation between the two.

Databases could treat the columns as the fundamental unit with tables being not much more than a view of a bunch of columns that can change over both space (partitioning) and time (history).

That’s effectively how datomic works. Datoms are the fundamental unit, with attributes being analogous to a column name and views being the 4 indexes that datomic keeps

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