Add GlobalSetting model

src/pretix/base/models/settings.py

@@ -0,0 +1,34 @@
+from django.db import models
+
+
+class GlobalSetting(models.Model):
+    """
+    A global setting is a key-value setting which can be set for a
+    pretix instance. It will be inherited by all events and organizers.
+    It is filled via the register_global_settings signal.
+    """
+    key = models.CharField(max_length=255, primary_key=True)
+    value = models.TextField()
+
+    def __init__(self, *args, object=None, **kwargs):
+        super().__init__(*args, **kwargs)
+
+
+class OrganizerSetting(models.Model):
+    """
+    An organizer setting is a key-value setting which can be set for an
+    organizer. It will be inherited by the events of this organizer
+    """
+    object = models.ForeignKey('Organizer', related_name='setting_objects', on_delete=models.CASCADE)
+    key = models.CharField(max_length=255)
+    value = models.TextField()
+
+
+class EventSetting(models.Model):
+    """
+    An event setting is a key-value setting which can be set for a
+    specific event
+    """
+    object = models.ForeignKey('Event', related_name='setting_objects', on_delete=models.CASCADE)
+    key = models.CharField(max_length=255)
+    value = models.TextField()