>Transactions (even at the single write level), foreign keys, indices, constraints are all there to make sure that your database should as much as possible not

>Transactions (even at the single write level), foreign keys, indices, constraints are all there to make sure that your database should as much as possible not be able to end up in a broken state. But you can have all that in process. Consider the most obvious case of just inverting things: writing your app directly in postgresql.