[server] fix SQLite patch to ensure TZDatetime are properly typed
NB: at this point, the TZ info is completely ignored. It will be
properly handled in later commits.
ifnotrql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',ask_confirm=False):rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',ask_confirm=False)