Reservations - can't create more than one reservation

[krzyk]

I was able to successfully create one reservation (http://localhost:5000/reservartion/create), but when I try to create another one it doesn't get created. List view shows only a single reservation - the first one created.
This should be corrected, I should be able to create any number of reservations.

And also there is an issue that duration is not included in the form and fails during insert (I allowed it to be nullable to test creating of reservation).

EDIT:
This is a caching issue, I we need to do a cache busting of view when there is a create/updated/delete for any model.

[0crat]

@emilianodellacasa/z please, pay attention to this issue