[server/rql2sql] use VariableRef.is_equivalent explicitly instead of relying on __eq__
What we want to compare is the variable referenced by the VariableRef,
we should make that explicit.
Closes #6694406
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()