[web/ajax] don't override any status code with 500 in ajax_error_handler
If the request produced an error such as Unauthorized or NotFound,
core_handle sets an appropriate status_out. Which is then overridden by
the ajax error handler.
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()