UPD: change grace period for purging registration and participant data.

dav_events/models/participant.py

@@ -9,7 +9,6 @@ from django.utils.translation import ugettext_lazy as _
 from dav_base.validators import DAVNumberValidator
 
 midnight = datetime.time(00, 00, 00)
-one_day = datetime.timedelta(1)
 
 
 @python_2_unicode_compatible
@@ -54,7 +53,8 @@ class Participant(models.Model):
         ordering = ['event', 'position']
 
     def __str__(self):
-        return '{position}. {name}'.format(
+        return '{eventnumber} - {position}. {name}'.format(
+            eventnumber=self.event.get_number(),
             position=self.position,
             name=self.get_full_name(),
         )
@@ -78,4 +78,18 @@ class Participant(models.Model):
             last_day = event.alt_first_day
         else:
             last_day = event.first_day
-        return timezone.make_aware(datetime.datetime.combine(last_day + one_day * 7, midnight))
+
+        april = datetime.date(last_day.year, 4, 1)
+        july = datetime.date(last_day.year, 7, 1)
+        july_nextyear = datetime.date(last_day.year + 1, 7, 1)
+        october = datetime.date(last_day.year, 10, 1)
+        january_nextyear = datetime.date(last_day.year + 1, 1, 1)
+
+        if last_day < april:
+            purge_date = july
+        elif last_day < october:
+            purge_date = january_nextyear
+        else:
+            purge_date = july_nextyear
+
+        return timezone.make_aware(datetime.datetime.combine(purge_date, midnight))