diff -r 2b11531b8028 -r c16fe74d0a5f cubicweb/misc/migration/3.24.0_Any.py
--- a/cubicweb/misc/migration/3.24.0_Any.py	Wed Sep 28 08:48:20 2016 +0200
+++ b/cubicweb/misc/migration/3.24.0_Any.py	Wed Oct 05 16:20:52 2016 +0200
@@ -1,2 +1,4 @@
 # Check the CW versions and add the entity only if needed ?
 add_entity_type('CWSession')
+rql('DELETE CWProperty X WHERE X pkey "system.version.pyramid"',
+    ask_confirm=False)