add default bookmark collection on new user

app/routes/users.py

@@ -14,7 +14,7 @@ from ..auth import (
     login_required, revoke_session, get_active_user,
     parse_display_name, revoke_all_sessions, csrf_verified
     )
-from ..models import Users, Posts, Reactions, Threads, Avatars, PostHistory, Mentions
+from ..models import Users, Posts, Reactions, Threads, Avatars, PostHistory, Mentions, BookmarkCollections
 from ..constants import PermissionLevel, InfoboxKind
 from ..util import get_form_checkbox
 import math
@@ -202,6 +202,8 @@ def sign_up_post():
         'created_at': int(time.time()),
     })
 
+    BookmarkCollections.create_default(user.id)
+
     if username_pair[0] != username_pair[1]:
         user.update({
             'display_name': parse_display_name(username_pair[1])