if not ('CWUniqueTogetherConstraint', 'CWRType') in schema['relations'].rdefs:
    add_relation_definition('CWUniqueTogetherConstraint', 'relations', 'CWRType')
    rql('SET C relations RT WHERE C relations RDEF, RDEF relation_type RT')
    commit()
    drop_relation_definition('CWUniqueTogetherConstraint', 'relations', 'CWAttribute')
    drop_relation_definition('CWUniqueTogetherConstraint', 'relations', 'CWRelation')

add_attribute('TrInfo', 'tr_count')
sync_schema_props_perms('TrInfo')