unique_together integration in CW (alf+syt)
* added in-DB representation of the constraint with a new entity type (CWUniqueTogetherConstraint)
* the schema is now migrated on a sync_schema_props_perms(EType) call in the migration script
* removed the migration commands provided in the first implementation
# some entities have been added before schema entities, fix the 'is' and
# 'is_instance_of' relations
for rtype in ('is', 'is_instance_of'):
sql('INSERT INTO %s_relation '
'SELECT X.eid, ET.cw_eid FROM entities as X, cw_CWEType as ET '
'WHERE X.type=ET.cw_name AND NOT EXISTS('
' SELECT 1 from is_relation '
' WHERE eid_from=X.eid AND eid_to=ET.cw_eid)' % rtype)