Some questions I can&#x27;t figure from reading the docs: indexes?  Are they inferred by my selects or do I have to create them explicitly?  Or do they just not exist?  Ditto keys, although if you want FK constraints in a loose ad-hoc system like this it&#x27;s probably the wrong tool for the job.<p>I imagine the nested transactions are implementation defined, since some dbs do &quot;rollback rolls back current trans&quot; and some do &quot;rollback rolls back entire stack.