--- a/candolint/models.py	Sat Jun 25 18:16:39 2016 +0800
+++ b/candolint/models.py	Sat Jun 25 22:11:38 2016 +0800
@@ -97,3 +97,8 @@
         if seconds or not minutes:
             result.append('{} sec'.format(seconds))
         return ' '.join(result)
+
+    @classmethod
+    def get_next_ordinal(cls, project):
+        count = cls.select(pw.fn.COUNT(cls.id)).where(cls.project == project)
+        return count + 1

--- a/incoming.py	Sat Jun 25 18:16:39 2016 +0800
+++ b/incoming.py	Sat Jun 25 22:11:38 2016 +0800
@@ -166,7 +166,7 @@
             project=project)
 
         Check.create(
-            ordinal=Check.select().where(Check.project == project).count() + 1,
+            ordinal=Check.get_next_ordinal(project),
             errors=errors,
             warnings=warnings,
             lines=json_encode(result),