From Mike:

• BUG: load up the daily-backup-03Dec2004.zip file into a standalone
  > instance (probably any instance), try to delete the Second Test Space -
  > blows up for me with:
  >
  > Cause:
  > org.springframework.dao.DataIntegrityViolationException:
  > (HibernateTemplate): data integrity violated by SQL ''; nested exception
  > is java.sql.SQLException: Integrity constraint violation:
  > FK594ACC88C38FBEA table: NOTIFICATIONS in statement [delete from CONTENT
  > where CONTENTID=7945]
  >
  > Stack Trace: [hide]
  >
  > org.springframework.dao.DataIntegrityViolationException:
  > (HibernateTemplate): data integrity violated by SQL ''; nested exception
  > is java.sql.SQLException: Integrity constraint violation:
  > FK594ACC88C38FBEA table: NOTIFICATIONS in statement [delete from CONTENT
  > where CONTENTID=7945]
  > java.sql.SQLException: Integrity constraint violation: FK594ACC88C38FBEA
  > table: NOTIFICATIONS in statement [delete from CONTENT where
  > CONTENTID=7945]
  > at org.hsqldb.Trace.getError(Unknown Source)
  > ..... (lots of lines)