with 3.6 checkpoint was renamed to commit

migration/1.7.0_Any.py

@@ -12,7 +12,7 @@
 
     publish = bwf.add_transition(_('publish'), draft, published,
                                  ('managers',))
-    checkpoint()
+    commit()
 
 # set state to published for already existing blog entries
 blogentries = rql('Any B WHERE B is BlogEntry')
@@ -23,4 +23,4 @@
                            'B eid %(b)s',
                            {'b': eid}, 'b')
 
-checkpoint()
+commit()