Ok apparently I repeat the mistake in several places so I need to look further into it.

From what I saw, there are several options:
- default=datetime.datetime.utcnow (equivalent to default=datetime.datetime.today but in utc)
- default=sqlalchemy.func.now

I'd prefer the first solution (w/ utcnow) but I need to make some more testing and come up with the correct patch that I will append to this p-r