Slots cannot run over midnight (00:00)

[micolous]

Slots are designed in a way so that you have:

• day (as foreign key) :arrow_right: has datetime.date
• start_time (as datetime.time)
• end_time (as datetime.time)

start_datetime and end_datetime compose these parameters into a (tz-naive) datetime.datetime object.

As a result, it is not possible to have a slot which runs over two different days (such as a talk from 23:30 - 00:30 the next day).