migration1.py

class Todo(models.Model):
    title = models.CharField(max_length=128)
    owner = models.ForeignKey(User)
    body = models.TextField(blank=True, null=True)
    due_date = models.DateTimeField(blank=True, null=True)
    start_date = models.DateTimeField(blank=True, null=True)
    date_created  = models.DateTimeField(auto_now_add=True)
    location = models.CharField(max_length=128, blank=True, null=True)
    all_day = models.BooleanField(default=False)

class Task(models.Model):
    title = models.CharField(max_length=128)
    owner = models.ForeignKey(User)
    due_date = models.DateTimeField(blank=True, null=True)
    start_date = models.DateTimeField(blank=True, null=True)
    date_created  = models.DateTimeField(auto_now_add=True)
    notes = models.ManyToManyField('Note', blank=True, null=True)

class Event(models.Model):
    title = models.CharField(max_length=128)
    owner = models.ForeignKey(User)
    start_date = models.DateTimeField(blank=True, null=True)
    end_date = models.DateTimeField(blank=True, null=True)
    date_created  = models.DateTimeField(auto_now_add=True)
    notes = models.ManyToManyField('Note', blank=True, null=True)
    location = models.CharField(max_length=128, blank=True, null=True)
    all_day = models.BooleanField(default=False)

class Note(models.Model):
    body = models.TextField(blank=True, null=True)
    date_created  = models.DateTimeField(auto_now_add=True)