On Friday, October 13, 2023, PG Doc comments form <noreply(at)postgresql(dot)org>
wrote:
> both of them round any precision
> beyond microseconds, and neither returns timestamps with greater precision
> than the value that was inserted.
>
That is precisely what a no default with maximum of six means. If we say
the default is six that would imply storage of less precise values pads
significant zeros until there are six.
David J.