[sql gen] Properly create UNIQUE index on non string column. Closes #13728492
Unique was previously detected in a loop triggered only for String columns.
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()