diff --git a/admin.php b/admin.php
index 5af339e..ee072d3 100644
--- a/admin.php
+++ b/admin.php
@@ -112,6 +112,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $currentParentId = isset($topic['parent_id']) && $topic['parent_id'] !== null ? (int)$topic['parent_id'] : null;
             topicUpdate($topicId, $name, $currentParentId, $sort);
             $message = 'Тематика обновлена';
+            if ($isAjax) {
+                header('Content-Type: application/json; charset=utf-8');
+                echo json_encode(['ok' => true, 'message' => $message], JSON_UNESCAPED_UNICODE);
+                exit;
+            }
         }
 
         if ($action === 'delete_topic') {
@@ -737,7 +742,7 @@ function nextUniqueCodeName(string $base): string
     .topic-node{border:1px solid #e5e7eb;border-radius:10px;padding:10px;background:#fff}
     .topic-node.level-2{margin-left:20px;border-color:#edf2fb;background:#fbfdff}
     .topic-node-head{font-size:12px;color:#667085;margin:0 0 8px}
-    .topic-row{display:grid;grid-template-columns:minmax(180px,1fr) 110px auto;gap:8px;align-items:center}
+    .topic-row{display:grid;grid-template-columns:minmax(180px,1fr) 110px;gap:8px;align-items:center}
     .topic-row .btn{height:36px}
     .topic-children{display:grid;gap:8px;margin-top:8px}
     @media (max-width:900px){.topic-row{grid-template-columns:1fr 110px}.topic-row .btn{width:100%}}
@@ -883,11 +888,11 @@ function nextUniqueCodeName(string $base): string
             <?php foreach($topicTree as $root): ?>
               <div class="topic-node level-1">
                 <p class="topic-node-head">Уровень 1</p>
-                <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" class="topic-row">
-                  <input type="hidden" name="action" value="update_topic"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$root['id'] ?>">
+                <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" class="topic-row js-topic-form">
+                  <input type="hidden" name="action" value="update_topic"><input type="hidden" name="ajax" value="1"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$root['id'] ?>">
                   <input class="in" type="text" name="name" value="<?= h((string)$root['name']) ?>" required>
                   <input class="in" type="number" name="sort_order" value="<?= (int)$root['sort_order'] ?>">
-                  <button class="btn btn-secondary" type="submit">Сохранить</button>
+                  <div class="small js-save-status" style="grid-column:1 / -1"></div>
                 </form>
                 <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" style="margin-top:8px">
                   <input type="hidden" name="action" value="delete_topic"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$root['id'] ?>">
@@ -899,11 +904,11 @@ function nextUniqueCodeName(string $base): string
                     <?php foreach($root['children'] as $child): ?>
                       <div class="topic-node level-2">
                         <p class="topic-node-head">Уровень 2 · внутри «<?= h((string)$root['name']) ?>»</p>
-                        <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" class="topic-row">
-                          <input type="hidden" name="action" value="update_topic"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$child['id'] ?>">
+                        <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" class="topic-row js-topic-form">
+                          <input type="hidden" name="action" value="update_topic"><input type="hidden" name="ajax" value="1"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$child['id'] ?>">
                           <input class="in" type="text" name="name" value="<?= h((string)$child['name']) ?>" required>
                           <input class="in" type="number" name="sort_order" value="<?= (int)$child['sort_order'] ?>">
-                          <button class="btn btn-secondary" type="submit">Сохранить</button>
+                          <div class="small js-save-status" style="grid-column:1 / -1"></div>
                         </form>
                         <form method="post" action="?token=<?= urlencode($tokenIncoming) ?>&mode=topics" style="margin-top:8px">
                           <input type="hidden" name="action" value="delete_topic"><input type="hidden" name="token" value="<?= h($tokenIncoming) ?>"><input type="hidden" name="topic_id" value="<?= (int)$child['id'] ?>">
@@ -1216,6 +1221,7 @@ function nextUniqueCodeName(string $base): string
 
   setupAutosave('.js-photo-form');
   setupAutosave('.js-section-form');
+  setupAutosave('.js-topic-form');
 
   window.confirmSectionDelete = () => {
     const first = confirm('Удалить раздел?');
diff --git a/index.php b/index.php
index 7911362..6cee188 100644
--- a/index.php
+++ b/index.php
@@ -15,6 +15,8 @@ $viewer = $viewerToken !== '' ? commenterByToken($viewerToken) : null;
 if ($_SERVER['REQUEST_METHOD'] === 'POST' && (string)($_POST['action'] ?? '') === 'add_comment') {
     $token = trim((string)($_POST['viewer'] ?? ''));
     $photoId = (int)($_POST['photo_id'] ?? 0);
+    $sectionId = (int)($_POST['section_id'] ?? 0);
+    $topicId = (int)($_POST['topic_id'] ?? 0);
     $text = trim((string)($_POST['comment_text'] ?? ''));
 
     if ($token !== '' && $photoId > 0 && $text !== '') {
@@ -25,6 +27,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && (string)($_POST['action'] ?? '') ==
     }
 
     $redirect = './?photo_id=' . $photoId;
+    if ($sectionId > 0) {
+        $redirect .= '&section_id=' . $sectionId;
+    }
+    if ($topicId > 0) {
+        $redirect .= '&topic_id=' . $topicId;
+    }
     if ($token !== '') {
         $redirect .= '&viewer=' . urlencode($token);
     }
@@ -35,11 +43,34 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && (string)($_POST['action'] ?? '') ==
 $sections = sectionsAll();
 $activeSectionId = (int)($_GET['section_id'] ?? 0);
 $activePhotoId = (int)($_GET['photo_id'] ?? 0);
+$activeTopicId = (int)($_GET['topic_id'] ?? 0);
 $welcomeText = settingGet('welcome_text', 'Добро пожаловать в галерею. Выберите раздел слева, чтобы посмотреть фотографии.');
 
 $photo = $activePhotoId > 0 ? photoById($activePhotoId) : null;
+if ($photo && $activeSectionId < 1) {
+    $activeSectionId = (int)$photo['section_id'];
+}
 $comments = $photo ? commentsByPhoto($activePhotoId) : [];
-$photos = $activeSectionId > 0 ? photosBySection($activeSectionId) : [];
+$topics = [];
+$topicCounts = [];
+try {
+    $topics = topicsAllForSelect();
+    if ($activeTopicId > 0) {
+        if (!topicById($activeTopicId)) {
+            $activeTopicId = 0;
+        }
+    }
+    $topicCounts = topicPhotoCounts($activeSectionId > 0 ? $activeSectionId : null);
+} catch (Throwable) {
+    $topics = [];
+    $topicCounts = [];
+    $activeTopicId = 0;
+}
+
+$photos = ($activeSectionId > 0 || $activeTopicId > 0)
+    ? photosForPublic($activeSectionId > 0 ? $activeSectionId : null, $activeTopicId > 0 ? $activeTopicId : null)
+    : [];
+$photoCommentCounts = photoCommentCountsByPhotoIds(array_map(static fn(array $p): int => (int)$p['id'], $photos));
 $isHomePage = $activeSectionId < 1 && $activePhotoId < 1;
 
 $detailTotal = 0;
@@ -49,7 +80,20 @@ $nextPhotoId = 0;
 $detailSectionId = 0;
 if ($photo) {
     $detailSectionId = (int)$photo['section_id'];
-    $detailPhotos = photosBySection($detailSectionId);
+    $detailPhotos = photosForPublic($detailSectionId, $activeTopicId > 0 ? $activeTopicId : null);
+    if ($activeTopicId > 0 && $detailPhotos !== []) {
+        $foundInTopic = false;
+        foreach ($detailPhotos as $d) {
+            if ((int)$d['id'] === $activePhotoId) {
+                $foundInTopic = true;
+                break;
+            }
+        }
+        if (!$foundInTopic) {
+            $detailPhotos = photosForPublic($detailSectionId, null);
+            $activeTopicId = 0;
+        }
+    }
     $detailTotal = count($detailPhotos);
     foreach ($detailPhotos as $i => $p) {
         if ((int)$p['id'] !== $activePhotoId) {
@@ -187,8 +231,17 @@ function outputWatermarked(string $path, string $mime): never
     .sec{display:grid;gap:6px}
     .sec a{display:block;padding:10px 12px;border-radius:10px;line-height:1.35;text-decoration:none;color:#111}
     .sec a.active{background:#eef4ff;color:#1f6feb}
+    .topic-nav{margin-top:12px;padding-top:12px;border-top:1px solid #e8edf5;display:grid;gap:6px}
+    .topic-link{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:#111;font-size:13px;line-height:1.3}
+    .topic-link.level-1{padding-left:20px}
+    .topic-link.active{background:#edf7f0;color:#146236}
+    .topic-link.disabled{opacity:.55}
     .cards{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}
     .card{border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;background:#fff}
+    .card-badges{position:absolute;top:8px;right:8px;display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;z-index:4;pointer-events:none}
+    .card-badge{display:inline-flex;align-items:center;justify-content:center;background:rgba(17,24,39,.78);color:#fff;font-size:11px;line-height:1;padding:6px 7px;border-radius:999px}
+    .card-badge.ai{background:rgba(31,111,235,.92)}
+    .card-badge.comments{background:rgba(3,105,161,.9)}
     .card img{width:100%;height:130px;object-fit:cover}
     .cap{padding:8px;font-size:13px}
     .detail img{max-width:100%;border-radius:10px;border:1px solid #e5e7eb}
@@ -261,8 +314,20 @@ function outputWatermarked(string $path, string $mime): never
         <?php endif; ?>
       </div>
       <?php foreach($sections as $s): ?>
-        <a class="<?= (int)$s['id']===$activeSectionId?'active':'' ?>" href="?section_id=<?= (int)$s['id'] ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>"><?= h((string)$s['name']) ?> <span class="muted">(<?= (int)$s['photos_count'] ?>)</span></a>
+        <a class="<?= (int)$s['id']===$activeSectionId?'active':'' ?>" href="?section_id=<?= (int)$s['id'] ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>"><?= h((string)$s['name']) ?> <span class="muted">(<?= (int)$s['photos_count'] ?>)</span></a>
       <?php endforeach; ?>
+
+      <?php if ($topics !== []): ?>
+        <div class="topic-nav">
+          <strong style="font-size:13px">Тематики</strong>
+          <a class="topic-link<?= $activeTopicId < 1 ? ' active' : '' ?>" href="?<?= $activeSectionId > 0 ? 'section_id=' . $activeSectionId : '' ?><?= $viewerToken!=='' ? (($activeSectionId > 0 ? '&' : '') . 'viewer=' . urlencode($viewerToken)) : '' ?>">Все тематики</a>
+          <?php foreach($topics as $t): ?>
+            <?php $topicCount = (int)($topicCounts[(int)$t['id']] ?? 0); ?>
+            <?php if ($activeSectionId > 0 && $topicCount < 1) continue; ?>
+            <a class="topic-link level-<?= (int)$t['level'] ?><?= (int)$t['id'] === $activeTopicId ? ' active' : '' ?>" href="?<?= $activeSectionId > 0 ? 'section_id=' . $activeSectionId . '&' : '' ?>topic_id=<?= (int)$t['id'] ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>"><?= (int)$t['level'] === 1 ? '— ' : '' ?><?= h((string)$t['full_name']) ?> <span class="muted">(<?= $topicCount ?>)</span></a>
+          <?php endforeach; ?>
+        </div>
+      <?php endif; ?>
       <p class="note" style="margin-top:12px"><?= $viewer ? 'Вы авторизованы для комментариев: ' . h((string)$viewer['display_name']) : 'Режим просмотра' ?></p>
     </aside>
     <main>
@@ -277,9 +342,11 @@ function outputWatermarked(string $path, string $mime): never
 
           <h3 style="margin-top:16px">Комментарии</h3>
           <?php if ($viewer): ?>
-            <form method="post" action="?photo_id=<?= (int)$photo['id'] ?>&viewer=<?= urlencode($viewerToken) ?>">
+            <form method="post" action="?photo_id=<?= (int)$photo['id'] ?>&section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?>&viewer=<?= urlencode($viewerToken) ?>">
               <input type="hidden" name="action" value="add_comment">
               <input type="hidden" name="photo_id" value="<?= (int)$photo['id'] ?>">
+              <input type="hidden" name="section_id" value="<?= (int)$detailSectionId ?>">
+              <input type="hidden" name="topic_id" value="<?= (int)$activeTopicId ?>">
               <input type="hidden" name="viewer" value="<?= h($viewerToken) ?>">
               <textarea name="comment_text" required style="width:100%;min-height:80px;border:1px solid #d1d5db;border-radius:8px;padding:8px"></textarea>
               <p><button class="btn" type="submit">Отправить</button></p>
@@ -296,8 +363,8 @@ function outputWatermarked(string $path, string $mime): never
             <div class="pager">
               <div class="muted">Фото <?= (int)$detailIndex ?> из <?= (int)$detailTotal ?></div>
               <div class="pager-actions">
-                <a class="pager-link<?= $prevPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$prevPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">← Предыдущее</a>
-                <a class="pager-link<?= $nextPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$nextPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">Следующее →</a>
+                <a class="pager-link<?= $prevPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$prevPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">← Предыдущее</a>
+                <a class="pager-link<?= $nextPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$nextPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">Следующее →</a>
               </div>
             </div>
           <?php endif; ?>
@@ -305,16 +372,20 @@ function outputWatermarked(string $path, string $mime): never
       <?php else: ?>
         <section class="panel">
           <h3>Фотографии</h3>
-          <?php if ($activeSectionId < 1): ?>
+          <?php if ($activeSectionId < 1 && $activeTopicId < 1): ?>
             <p class="muted"><?= nl2br(h($welcomeText)) ?></p>
           <?php elseif ($photos === []): ?>
             <p class="muted">В разделе пока нет фотографий.</p>
           <?php else: ?>
             <div class="cards">
               <?php foreach($photos as $p): ?>
-                <a class="card" href="?photo_id=<?= (int)$p['id'] ?>&section_id=<?= (int)$activeSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" style="text-decoration:none;color:inherit;position:relative">
+                <?php $cardCommentCount = (int)($photoCommentCounts[(int)$p['id']] ?? 0); ?>
+                <a class="card" href="?photo_id=<?= (int)$p['id'] ?>&section_id=<?= (int)$p['section_id'] ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" style="text-decoration:none;color:inherit;position:relative">
                   <?php if (!empty($p['before_file_id'])): ?><div class="img-box thumb-img-box"><img src="?action=image&file_id=<?= (int)$p['before_file_id'] ?>" alt="" loading="lazy" decoding="async" fetchpriority="low"></div><?php endif; ?>
-                  <?php if (!empty($p['after_file_id'])): ?><span title="Есть обработанная версия" style="position:absolute;top:8px;right:8px;background:rgba(31,111,235,.92);color:#fff;font-size:11px;line-height:1;padding:6px 7px;border-radius:999px">AI</span><?php endif; ?>
+                  <div class="card-badges">
+                    <?php if ($cardCommentCount > 0): ?><span class="card-badge comments" title="Комментариев: <?= $cardCommentCount ?>">💬 <?= $cardCommentCount ?></span><?php endif; ?>
+                    <?php if (!empty($p['after_file_id'])): ?><span class="card-badge ai" title="Есть обработанная версия">AI</span><?php endif; ?>
+                  </div>
                   <div class="cap"><strong><?= h((string)$p['code_name']) ?></strong><br><span class="muted"><?= h((string)($p['description'] ?? '')) ?></span></div>
                 </a>
               <?php endforeach; ?>
@@ -331,10 +402,10 @@ function outputWatermarked(string $path, string $mime): never
 </div>
 <?php if ($hasMobilePhotoNav): ?>
   <nav class="mobile-photo-nav" aria-label="Навигация по фото">
-    <a class="mobile-nav-link" href="?section_id=<?= (int)$detailSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">К разделу</a>
+    <a class="mobile-nav-link" href="?section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>">К разделу</a>
     <div class="mobile-nav-meta">Фото <?= (int)$detailIndex ?> из <?= (int)$detailTotal ?></div>
-    <a class="mobile-nav-link<?= $prevPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$prevPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" aria-disabled="<?= $prevPhotoId < 1 ? 'true' : 'false' ?>">←</a>
-    <a class="mobile-nav-link<?= $nextPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$nextPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" aria-disabled="<?= $nextPhotoId < 1 ? 'true' : 'false' ?>">→</a>
+    <a class="mobile-nav-link<?= $prevPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$prevPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" aria-disabled="<?= $prevPhotoId < 1 ? 'true' : 'false' ?>">←</a>
+    <a class="mobile-nav-link<?= $nextPhotoId < 1 ? ' disabled' : '' ?>" href="?photo_id=<?= (int)$nextPhotoId ?>&section_id=<?= (int)$detailSectionId ?><?= $activeTopicId > 0 ? '&topic_id=' . $activeTopicId : '' ?><?= $viewerToken!=='' ? '&viewer=' . urlencode($viewerToken) : '' ?>" aria-disabled="<?= $nextPhotoId < 1 ? 'true' : 'false' ?>">→</a>
   </nav>
 <?php endif; ?>
 <script>
diff --git a/lib/db_gallery.php b/lib/db_gallery.php
index 7713b5c..3762996 100644
--- a/lib/db_gallery.php
+++ b/lib/db_gallery.php
@@ -52,6 +52,38 @@ function photosBySection(int $sectionId): array
     return $st->fetchAll();
 }
 
+function photosForPublic(?int $sectionId = null, ?int $topicId = null): array
+{
+    $sql = 'SELECT p.*,
+                   bf.id AS before_file_id, bf.file_path AS before_path,
+                   af.id AS after_file_id, af.file_path AS after_path
+            FROM photos p
+            LEFT JOIN photo_files bf ON bf.photo_id=p.id AND bf.kind="before"
+            LEFT JOIN photo_files af ON af.photo_id=p.id AND af.kind="after"';
+
+    $where = [];
+    $params = [];
+
+    if ($topicId !== null && $topicId > 0) {
+        $sql .= ' INNER JOIN photo_topics ptf ON ptf.photo_id=p.id AND ptf.topic_id=:tid';
+        $params['tid'] = $topicId;
+    }
+
+    if ($sectionId !== null && $sectionId > 0) {
+        $where[] = 'p.section_id=:sid';
+        $params['sid'] = $sectionId;
+    }
+
+    if ($where !== []) {
+        $sql .= ' WHERE ' . implode(' AND ', $where);
+    }
+
+    $sql .= ' ORDER BY p.sort_order, p.id DESC';
+    $st = db()->prepare($sql);
+    $st->execute($params);
+    return $st->fetchAll();
+}
+
 function photoById(int $photoId): ?array
 {
     $sql = 'SELECT p.*, 
@@ -66,6 +98,48 @@ function photoById(int $photoId): ?array
     return $st->fetch() ?: null;
 }
 
+function photoCommentCountsByPhotoIds(array $photoIds): array
+{
+    $photoIds = array_values(array_unique(array_map('intval', $photoIds)));
+    if ($photoIds === []) {
+        return [];
+    }
+
+    $placeholders = implode(',', array_fill(0, count($photoIds), '?'));
+    $sql = "SELECT photo_id, COUNT(*) AS cnt FROM photo_comments WHERE photo_id IN ($placeholders) GROUP BY photo_id";
+    $st = db()->prepare($sql);
+    $st->execute($photoIds);
+
+    $map = [];
+    foreach ($st->fetchAll() as $row) {
+        $map[(int)$row['photo_id']] = (int)$row['cnt'];
+    }
+    return $map;
+}
+
+function topicPhotoCounts(?int $sectionId = null): array
+{
+    $sql = 'SELECT pt.topic_id, COUNT(DISTINCT p.id) AS cnt
+            FROM photo_topics pt
+            JOIN photos p ON p.id=pt.photo_id';
+    $params = [];
+
+    if ($sectionId !== null && $sectionId > 0) {
+        $sql .= ' WHERE p.section_id=:sid';
+        $params['sid'] = $sectionId;
+    }
+
+    $sql .= ' GROUP BY pt.topic_id';
+    $st = db()->prepare($sql);
+    $st->execute($params);
+
+    $map = [];
+    foreach ($st->fetchAll() as $row) {
+        $map[(int)$row['topic_id']] = (int)$row['cnt'];
+    }
+    return $map;
+}
+
 function topicById(int $id): ?array
 {
     $st = db()->prepare('SELECT * FROM topics WHERE id=:id');