who is pgsql in cvs

Hello,

I'm a grad student doing some work correlating mailinglist activity
with cvs activity for a datamining conference and I'm using postgres
as one of the OSS projects under study.  For most names of cvs
committers, I've been able to determine what e-mail addresses they
used on this mailinglist.  The one cvs identity that I'm having a
tough time with is pgsql.  Is this cvs committer a person or an
account used for some special purpose?  It looks to have a number of
commits over the life of the repository.  If anyone could help me out
by letting me know who pgsql is or if it isn't a person and fulfills
some role, that would be greatly appreciated!  Thanks a bunch!

-- Chris

--
Christian Bird
cabird@gmail.com
Computer Science Dept.
UC Davis