Type alias Generated<S>

A shortcut for defining database-generated columns. The type is the same for all selects, inserts and updates but the column is optional for inserts and updates.

The implementation:

// The update type is `S` instead of `S | undefined` because
// updates are always optional --> no need to specify optionality.
type Generated<S> = ColumnType<S, S | undefined, S>
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