Artifact: Disposable reader measurement source
Execution: Extract from the PHP opening line into an external temporary file; commands are in measurements.txt

<?php
// Disposable measurement; archive as text, not an application/test entry point.
require $argv[1] . '/autoload.php';
use ForumRewrite\ReadModel\ThreadRepository;
use ForumRewrite\ReadModel\TagPage;
use ForumRewrite\Qdb\QdbBoardPolicy;
use ForumRewrite\ReadModel\ReadModelBuilder;
use ForumRewrite\Canonical\CanonicalRecordRepository;
final class CountedStatement extends PDOStatement {
    public static int $rows=0, $bodies=0, $bodyBytes=0;
    private static function record(mixed $row): void {
        if (!is_array($row)) return;
        self::$rows++;
        if (array_key_exists('root_post_body',$row)) { self::$bodies++; self::$bodyBytes+=strlen($row['root_post_body']); }
    }
    public function fetch(int $mode=PDO::FETCH_DEFAULT,int $cursorOrientation=PDO::FETCH_ORI_NEXT,int $cursorOffset=0): mixed {
        $row=parent::fetch($mode,$cursorOrientation,$cursorOffset); self::record($row); return $row;
    }
    public function fetchAll(int $mode=PDO::FETCH_DEFAULT,mixed ...$args): array {
        $rows=parent::fetchAll($mode,...$args); foreach($rows as $row) self::record($row); return $rows;
    }
}
[$script,$project,$dir,$mode,$count]=$argv;
$count=(int)$count;
if (!is_dir($dir) || str_starts_with(realpath($dir),realpath($project).'/')) throw new RuntimeException('Use external temporary directory');
$db="$dir/model-$count.sqlite";
if($mode==='setup') {
    if(file_exists($db)) throw new RuntimeException('Do not overwrite fixture');
    $root="$dir/records-$count"; mkdir($root);
    $src="$project/tests/fixtures/parity_minimal_v1";
    foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($src,FilesystemIterator::SKIP_DOTS),RecursiveIteratorIterator::SELF_FIRST) as $file) {
        $target=$root.substr($file->getPathname(),strlen($src)); $file->isDir()?mkdir($target):copy($file->getPathname(),$target);
    }
    (new ReadModelBuilder($root,$db,new CanonicalRecordRepository($root)))->rebuild();
    $pdo=new PDO('sqlite:'.$db,null,null,[PDO::ATTR_ERRMODE=>PDO::ERRMODE_EXCEPTION]);
    $pdo->exec('DELETE FROM threads'); $pdo->exec('DELETE FROM posts');
    $pdo->beginTransaction();
    $post=$pdo->prepare("INSERT INTO posts(post_id,thread_id,created_at,subject,body,board_tags_json,sequence_number,author_label) VALUES (?,?,'2026-10-30T00:00:00Z','quote',?,'[\"general\"]',1,'guest')");
    $thread=$pdo->prepare("INSERT INTO threads(root_post_id,root_post_created_at,last_activity_at,subject,body_preview,board_tags_json,thread_labels_json,reply_count,last_post_id,score_total,vote_count) VALUES (?,'2026-10-30T00:00:00Z','2026-10-30T00:00:00Z','quote',?,'[\"general\"]',?,0,?,0,0)");
    for($i=1;$i<=$count;$i++) {
        $id=sprintf('thread-20261030000000-qdb-%06d',$i);
        $post->execute([$id,$id,str_repeat('q',2048)]);
        $thread->execute([$id,str_repeat('q',1024),$i===1?'["pinned"]':'[]',$id]);
    }
    $pdo->commit(); echo "Setup candidates: $count\n"; exit;
}
$pdo=new PDO('sqlite:'.$db,null,null,[PDO::ATTR_ERRMODE=>PDO::ERRMODE_EXCEPTION,PDO::ATTR_DEFAULT_FETCH_MODE=>PDO::FETCH_ASSOC,PDO::ATTR_STATEMENT_CLASS=>[CountedStatement::class]]);
$base=memory_get_usage(true); $start=hrtime(true);
if($mode==='qdb25' || $mode==='welcome5') {
    $policy=new QdbBoardPolicy($dir,static fn()=>null);
    $all=$policy->eligibleQuotes(ThreadRepository::fetchThreads($pdo));
    $selected=$mode==='qdb25'?$policy->paginate($all,'latest',1)['threads']:array_slice($all,0,5);
    $total=count($all);
} elseif($mode==='tag25') {
    $selected=TagPage::page($pdo,'general')['items']; $total=$count;
} else throw new RuntimeException('Unknown mode');
$elapsed=(hrtime(true)-$start)/1e6;
$ids=array_column($selected,'root_post_id'); $expected=[];
$used=$mode==='welcome5'?5:25;
for($i=$count;$i>$count-$used;$i--) $expected[]=sprintf('thread-20261030000000-qdb-%06d',$i);
if($ids!==$expected || $total!==$count) throw new RuntimeException('Identity/count mismatch');
echo "Mode: $mode\nCandidates: $count\nSelected: ".count($selected)."\nPDO rows transferred: ".CountedStatement::$rows."\nBodies materialized: ".CountedStatement::$bodies."\nRoot body bytes transferred: ".CountedStatement::$bodyBytes."\nSource rows examined: unknown\nIdentity and total checks: pass\nWall milliseconds: $elapsed\nPHP baseline bytes: $base\nPHP peak bytes: ".memory_get_peak_usage(true)."\n";