Remove unused tournament model fields

tournaments/models/tournament.py

@@ -96,8 +96,6 @@ class Tournament(BaseModel):
     club_member_fee_deduction = models.FloatField(null=True, blank=True)
     unregister_delta_in_hours = models.IntegerField(default=24)
     currency_code = models.CharField(null=True, blank=True, max_length=3, default='EUR')
-    parent = models.ForeignKey('self', blank=True, null=True, on_delete=models.SET_NULL, related_name='children')
-    loser_index = models.IntegerField(default=0)
 
     def delete_dependencies(self):
         for team_registration in self.team_registrations.all():