Make all default times store in the DB with milliseconds down to 6point.

[jwoertink]

Fixes #727

This makes all Time columns store with milliseconds. The tough part is if you're trying to do exact comparison with time, it's a bit harder now, but the benefit is if you need to sort by a time column, you'll get a more accurate sorting. This is especially common with UUID based tables that sort by created_at.

Also to note that out of the box default with postgres seems to use this same format for time columns:

development=# select now();
              now              
-------------------------------
 2022-03-12 18:02:14.760713+00
(1 row)

[jkthorne]

does this work with all the time datatypes in postgres?

[jwoertink]

Probably not with the date field, but we only map Time to timestampz, so for now that's the only one I'm looking at. I think for the other date/time column types, you'd probably have to hand roll some custom stuff.