Add a kind of trashbin for registrations and participants

dav_registration/admin.py

@@ -1,8 +1,12 @@
 from django.contrib import admin
 
-from .models import Registration
+from .models import Registration, RegistrationStatus
+
+
+class RegistrationStatusInline(admin.StackedInline):
+    model = RegistrationStatus
 
 
 @admin.register(Registration)
 class RegistrationAdmin(admin.ModelAdmin):
-    pass
+    inlines = [RegistrationStatusInline]