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  CREATE TABLE mytable
  (
      person VARCHAR(20),
      lasttime INTEGER
  );

  my $sql = "INSERT INTO mytable (person,lasttime) VALUES ?, ?";
  my $sth = $dbh->prepare( $sql );
...
  {
      die( "DB Error " . $dbh->errstr . "\n" );
  }

  my $timenow = time();
  my $fiveminutes = 5 * 60; # 60 seconds times five
...
  {
      die( "DB Error " . $dbh->errstr . "\n" );
  }