--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/misc/migration/3.10.4_Any.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,8 @@
+for eschema in schema.entities():
+    if not (eschema.final or 'cw_source' in eschema.subjrels):
+        add_relation_definition(eschema.type, 'cw_source', 'CWSource', ask_confirm=False)
+
+sql('INSERT INTO cw_source_relation(eid_from, eid_to) '
+    'SELECT e.eid,s.cw_eid FROM entities as e, cw_CWSource as s '
+    'WHERE s.cw_name=e.source AND NOT EXISTS(SELECT 1 FROM cw_source_relation WHERE eid_from=e.eid AND eid_to=s.cw_eid)')
+commit()