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sub store {
    my ($self, $sid, $options, $data) = @_;   
...
    
    return $dbh->selectrow_array(qq|SELECT RELEASE_LOCK("$sid")|);
}

CREATE TABLE sessions (
        id CHAR(32) NOT NULL UNIQUE,
        expires datetime,
        a_session TEXT NOT NULL
    );

select id from sessions where expires <= NOW() or expires is null