field=models.CharField(blank=True,help_text='If not blank, this exam ticket may only be used in the given facility',max_length=200,null=True,verbose_name='Restrict to facility'),
),
migrations.AddField(
model_name='examticket',
name='valid_end_time',
field=models.DateTimeField(blank=True,help_text='If not blank, date and time at which this exam ticket stops being valid/usable',null=True,verbose_name='End valid period'),
),
migrations.AddField(
model_name='examticket',
name='valid_start_time',
field=models.DateTimeField(blank=True,help_text='If not blank, date and time at which this exam ticket starts being valid/usable',null=True,verbose_name='End valid period'),
),
migrations.AlterField(
model_name='examticket',
name='usage_time',
field=models.DateTimeField(blank=True,help_text='Date and time of first usage of ticket',null=True,verbose_name='Usage time'),
('token_hash',models.CharField(blank=True,help_text='A hash of the authentication token to be used for direct git access.',max_length=200,null=True,unique=True,verbose_name='Hash of git authentication token')),
('restrict_to_participation_role',models.ForeignKey(blank=True,null=True,on_delete=django.db.models.deletion.CASCADE,to='course.ParticipationRole',verbose_name='Restrict to role')),