" turadi — brauzerda ochib bo'lmaydi.

function db_decode(string $raw): array {
    $p = strpos($raw, "\n");
    $d = json_decode($p === false ? '' : substr($raw, $p + 1), true);
    $def = ['users' => [], 'channels' => [], 'pool' => [], 'logs' => [],
            'stats' => ['reactions' => 0, 'runs' => 0], 'settings' => []];
    $d = is_array($d) ? array_merge($def, $d) : $def;
    $d['settings'] = array_merge([
        'emojis' => DEFAULT_EMOJIS, 'delay_ms' => 250, 'max_per_run' => 50,
        'daily_limit' => 200, 'maintenance' => false,
    ], is_array($d['settings']) ? $d['settings'] : []);
    return $d;
}

function db_init(): void {
    $dir = dirname(DB_FILE);
    if (!is_dir($dir)) @mkdir($dir, 0750, true);
    $ht = $dir . '/.htaccess';
    if (!file_exists($ht)) @file_put_contents($ht, "Require all denied\n");
}

function db_read(): array {
    db_init();
    $fh = fopen(DB_FILE, 'c+');
    flock($fh, LOCK_SH);
    $raw = stream_get_contents($fh);
    flock($fh, LOCK_UN);
    fclose($fh);
    return db_decode((string)$raw);
}

/** Bazani o'qiydi → $fn(&$db) ni chaqiradi → saqlaydi. Hammasi bitta qulf ostida. */
function db_mutate(callable $fn) {
    db_init();
    $fh = fopen(DB_FILE, 'c+');
    flock($fh, LOCK_EX);
    $db = db_decode((string)stream_get_contents($fh));
    $ret = $fn($db);
    ftruncate($fh, 0);
    rewind($fh);
    fwrite($fh, "