diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/misc/migration/3.14.0_Any.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/misc/migration/3.14.0_Any.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,15 @@
+from __future__ import print_function
+
+config['rql-cache-size'] = config['rql-cache-size'] * 10
+
+add_entity_type('CWDataImport')
+
+from cubicweb.schema import CONSTRAINTS, guess_rrqlexpr_mainvars
+for rqlcstr in rql('Any X,XT,XV WHERE X is CWConstraint, X cstrtype XT, X value XV,'
+                   'X cstrtype XT, XT name IN ("RQLUniqueConstraint","RQLConstraint","RQLVocabularyConstraint"),'
+                   'NOT X value ~= ";%"').entities():
+    expression = rqlcstr.value
+    mainvars = guess_rrqlexpr_mainvars(expression)
+    yamscstr = CONSTRAINTS[rqlcstr.type](expression, mainvars)
+    rqlcstr.cw_set(value=yamscstr.serialize())
+    print('updated', rqlcstr.type, rqlcstr.value.strip())