fix flake8

src/pretix/base/settings.py

@@ -3291,6 +3291,8 @@ Your {organizer} team"""))  # noqa: W291
             label=_('Validity of gift card codes in years'),
             help_text=_('If you set a number here, gift cards will by default expire at the end of the year after this '
                         'many years. If you keep it empty, gift cards do not have an explicit expiry date.'),
+            min_value=0,
+            max_value=99,
         )
     },
     'cookie_consent': {

src/pretix/presale/forms/customer.py

@@ -257,18 +257,21 @@ class RegistrationForm(forms.Form):
         return self.cleaned_data
 
     def create(self):
-        customer = self.request.organizer.customers.create(
+        customer, created = self.request.organizer.customers.get_or_create(
             email=self.cleaned_data['email'],
-            name_parts=self.cleaned_data['name_parts'],
-            phone=self.cleaned_data.get('phone'),
-            is_active=True,
-            is_verified=False,
-            locale=get_language_without_region(),
+            defaults={
+                "name_parts": self.cleaned_data['name_parts'],
+                "phone": self.cleaned_data.get('phone'),
+                "is_active": True,
+                "is_verified": False,
+                "locale": get_language_without_region(),
+            }
         )
-        customer.set_unusable_password()
-        customer.save()
-        customer.log_action('pretix.customer.created', {})
-        customer.send_activation_mail()
+        if created:
+            customer.set_unusable_password()
+            customer.save()
+            customer.log_action('pretix.customer.created', {})
+            customer.send_activation_mail()
         return customer
 
 

src/pretix/presale/templates/pretixpresale/event/base.html

@@ -15,6 +15,8 @@
 {% block custom_header %}
     {% if event.settings.meta_noindex %}
         <meta name="robots" content="noindex, nofollow">
+    {% elif "date" in request.GET or "old" in request.GET %}
+        <meta name="robots" content="noindex, follow">
     {% endif %}
     <meta property="og:type" content="website" />
     {% if social_image %}

src/pretix/presale/templates/pretixpresale/organizers/base.html

@@ -11,6 +11,8 @@
 {% block custom_header %}
     {% if organizer.settings.meta_noindex %}
         <meta name="robots" content="noindex, nofollow">
+    {% elif "date" in request.GET or "old" in request.GET %}
+        <meta name="robots" content="noindex, follow">
     {% endif %}
     <meta property="og:type" content="website" />