from django.db import models

class Event(models.Model):

    dt = models.DateTimeField()

class MaybeEvent(models.Model):

    dt = models.DateTimeField(blank=True, null=True)

class Session(models.Model):

    name = models.CharField(max_length=20)

class SessionEvent(models.Model):

    dt = models.DateTimeField()

    session = models.ForeignKey(Session, models.CASCADE, related_name="events")

class Timestamp(models.Model):

    created = models.DateTimeField(auto_now_add=True)

    updated = models.DateTimeField(auto_now=True)

class AllDayEvent(models.Model):

    day = models.DateField()

class DailyEvent(models.Model):

    time = models.TimeField()