Fixes generating new key paris for user

and the broadcast test

bookwyrm/models/user.py

@@ -155,8 +155,6 @@ class User(OrderedCollectionPageMixin, AbstractUser):
         self.inbox = '%s/inbox' % self.remote_id
         self.shared_inbox = 'https://%s/inbox' % DOMAIN
         self.outbox = '%s/outbox' % self.remote_id
-        if not self.key_pair:
-            self.key_pair = KeyPair.objects.create()
 
         return super().save(*args, **kwargs)
 
@@ -197,6 +195,9 @@ def execute_after_save(sender, instance, created, *args, **kwargs):
     if not instance.local:
         set_remote_server.delay(instance.id)
 
+    instance.key_pair = KeyPair.objects.create(
+        remote_id='%s/#main-key' % instance.remote_id)
+
     shelves = [{
         'name': 'To Read',
         'identifier': 'to-read',