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Trac 0.7 has a new database format, requiring manual upgrade.
The following steps are needed to upgrade:

1) convert the old-style trac databases to new-style trac environments:

  # tracdb2env /path/to/old/project.db /path/to/new/projectenv


2) update your httpd.conf. change the line
      SetEnv TRAC_DB "/path/to/old/project.db"
   to
      SetEnv TRAC_ENV "/path/to/new/projectenv"


3) once you verified everything works fine, delete your old database:

  # rm /path/to/old/project.db
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