The PITR docs that have just been put up say:

        But if you want to recover to some previous point in time (say,
        right before the junior DBA dropped your main transaction
        table), just specify the required stopping point in
        recovery.conf. You can specify the stop point either by
        date/time or by transaction ID. As of this writing only the
        date/time option is very usable, since there are no tools to
        help you identify which transaction ID to use.

How about adding a logging option to put the transaction id on the log
for every statement that modifies the database?  Would that be a small
enough change to be allowed into 8.0?
-- 
Oliver Elphick                                          [EMAIL PROTECTED]
Isle of Wight                              http://www.lfix.co.uk/oliver
GPG: 1024D/A54310EA  92C8 39E7 280E 3631 3F0E  1EC0 5664 7A2F A543 10EA
                 ========================================
     "And not only so, but we glory in tribulations also; 
      knowing that tribulation worketh patience; And  
      patience, experience; and experience, hope."          
                                        Romans 5:3,4 


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