Florian Weimer <[EMAIL PROTECTED]> writes:
> In theory, this should be possible (especially if you haven't switched
> off full page writes).

Not really --- the WAL records are not designed to carry full
information about the preceding state of the page, so you can't use them
to undo.  (Example: a DELETE record says which tuple was deleted, but
not what was in it.)

                        regards, tom lane

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