a with-transaction question

Hi,

I am getting a warning from the postgres backend that some code is entering
(via with-transaction) nested transactions. I looked at transaction.lisp and
was puzzled by the fact that the with-transaction macro does not check for this
situation, unlike start-transaction function, for example. What is the pattern
here: should I call in-transaction-p myself or do something else to avoid
nested transactions? Besides the warning, the checks of transaction-level at
several places use only (= 1 transaction-level), so I am not confident nested
transactions are safe.

Thanks,
Alex

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