User column definitions

It would be very useful to be able to define column types that have their own set of rules/formulae and to be able use them across several schemas so that changes in the base definition could be propagated to the schemas in which it’s used.

For example, I have a date field that had to be modified in base table schema but which appeared in 40 others (error test data).

passportIssueDate ::= [__equineFullDoB + days(__passportIssueDays), now()].min

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