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what's stopping us from breaking this into two projects.  

The first being a redesign of the table space, and upgrade of the DB to
the most recent version of Postgres, with modification of the current
PHP code.  This could be an evolutionary process, with the one
"revolutionary" moment being the upgrade to Postgres and concurrent
update of the PHP code to remove the MySQLisms.  Once we are on the new
system, the tables and queries could be updated a few at a time to
improve performance incrementally and evolutionarily.

The second stage would then be upgrading  -- with the improved table
structure -- to the new ModWiki software.