diff -r ab0a1863248e -r 3e69bccc2022 misc/migration/3.22.3_Any.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/migration/3.22.3_Any.py	Thu Jun 16 17:45:16 2016 +0200
@@ -0,0 +1,11 @@
+from yams.constraints import UniqueConstraint
+
+for rschema in schema.relations():
+    if rschema.rule or not rschema.final:
+        continue
+    for rdef in rschema.rdefs.values():
+        if (rdef.object != 'String'
+                and any(isinstance(cstr, UniqueConstraint) for cstr in rdef.constraints)):
+            table = 'cw_{0}'.format(rdef.subject)
+            column = 'cw_{0}'.format(rdef.rtype)
+            repo.system_source.create_index(cnx, table, column, unique=True)