my $temp;
my $header = <DATA>;

while( <DATA> ){
        my ($id, $data) = /(\S+)(.+)/;
        open my $fh, '>>', $id
                or die "cannot open file $id: $!";
        print $fh $header
                if $temp ne $id;
        print $fh $id, $data, $/;
        $temp = $id;
}


__DATA__
  Usr1369***12556
06-01-0101:00    1169 <snipped off>
06-01-0101:00    2396 <snipped off>
06-01-0103:12    1169 <snipped off>
06-01-0103:12    2569 <snipped off>
06-01-0301:00    1169 <snipped off>
06-01-0301:00    2396 <snipped off>