[schema] fix composite deletion handling Do not delete component entities if the composite is not deleted in the same transaction. Deletion semantics are thus: if the composite is deleted, the components are deleted. Closes #3463112.

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()