[cwvreg] Fix propertyvalues hot updates
When CWProperty instances are touched, the corresponding value gets
updated in vreg['propertyvalues'], but their type was ignored.
for table, column in [
('transactions', 'tx_time'),
('tx_entity_actions', 'tx_uuid'),
('tx_relation_actions', 'tx_uuid')]:
repo.system_source.create_index(session, table, column)
commit()