diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b98386..9ba9bf2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,19 @@ Format : [Keep a Changelog](https://keepachangelog.com/fr/1.0.0/) — versionnag
 
 ---
 
+## [1.6.16] - 2026-05-16
+
+### Ajouté
+- `SearchLogParser` : paramètre `$days` (7 ou 14) — cache distinct par période, filtre logFiles par date (#46)
+- `admin/searches` : boutons 7 j / 14 j pour choisir la fenêtre d'analyse (#46)
+
+### Modifié
+- `SearchLogParser` : tri par visiteurs uniques (IPs distinctes) au lieu de hits bruts — colonne renommée « Visiteurs » (#41)
+- URL inconnue / article introuvable : redirection 302 vers `/search?q=…` au lieu de page 404 (#57)
+- `edit_tags` : sections « Abréviations » et « Noms composés » masquées si des valeurs connues existent pour le type (#48)
+
+---
+
 ## [1.6.15] - 2026-05-16
 
 ### Ajouté
diff --git a/public/index.php b/public/index.php
index 37a305d..0cc6c77 100644
--- a/public/index.php
+++ b/public/index.php
@@ -50,12 +50,17 @@ $metaRobots = in_array($action, $_noindexActions, true) ? 'noindex, nofollow' :
 unset($_noindexActions);
 
 // ─── Recherche de l'article le plus proche et redirection 301 ────────────────
+function slugToSearchQuery(string $rawPath): string
+{
+    return trim((string)preg_replace('/\s{2,}/', ' ', (string)preg_replace(
+        '/[^a-zA-ZÀ-ÿ0-9\s]/u', ' ', str_replace(['-', '_', '/'], ' ', $rawPath)
+    )));
+}
+
 function searchAndRedirect(string $rawPath, ArticleManager $articles): void
 {
     require_once BASE_PATH . '/src/SearchEngine.php';
-    $query = (string)preg_replace('/\s{2,}/', ' ', trim(
-        (string)preg_replace('/[^a-zA-ZÀ-ÿ0-9\s]/u', ' ', str_replace(['-', '_', '/'], ' ', $rawPath))
-    ));
+    $query = slugToSearchQuery($rawPath);
     if ($query === '') {
         return;
     }
@@ -666,9 +671,8 @@ switch ($action) {
     case 'view':
         $article = $slug !== '' ? $articles->getBySlug($slug) : null;
         if (!$article) {
-            searchAndRedirect($slug, $articles);
-            http_response_code(404);
-            echo 'Article introuvable.';
+            $q = slugToSearchQuery($slug);
+            header('Location: /search' . ($q !== '' ? '?q=' . urlencode($q) : ''), true, 302);
             exit;
         }
 
@@ -2577,9 +2581,11 @@ switch ($action) {
                 exit;
             }
             require_once BASE_PATH . '/src/SearchLogParser.php';
-            $parser = new SearchLogParser('/var/log/apache2', apacheAccessLog());
-            $adminData['search_terms']       = $parser->topTerms(100);
+            $days   = in_array((int)($_GET['days'] ?? 14), [7, 14], true) ? (int)$_GET['days'] : 14;
+            $parser = new SearchLogParser('/var/log/apache2', apacheAccessLog(), '', 600, $days);
+            $adminData['search_terms']        = $parser->topTerms(100);
             $adminData['search_log_readable'] = $parser->isReadable();
+            $adminData['search_days']         = $days;
         }
 
         if ($tab === 'stats') {
@@ -3383,23 +3389,9 @@ switch ($action) {
             (string)(parse_url($_SERVER['REDIRECT_URL'] ?? $_SERVER['REQUEST_URI'] ?? '', PHP_URL_PATH) ?? ''),
             '/'
         );
-        if ($notFoundPath !== '') {
-            searchAndRedirect(basename($notFoundPath), $articles);
-        }
-        http_response_code(404);
-        ob_start();
-        ?>
-        <div class="container py-5 text-center">
-            <h1 class="h2 mb-3">Page introuvable</h1>
-            <p class="text-muted mb-4">Cette adresse ne correspond à aucun article.<br>Vous avez peut-être suivi un ancien lien.</p>
-            <a href="/" class="btn btn-primary">← Retour à l'accueil</a>
-        </div>
-        <?php
-        $content    = ob_get_clean();
-        $title      = '404 — ' . siteTitle();
-        $metaRobots = 'noindex, nofollow';
-        include BASE_PATH . '/templates/layout.php';
-        break;
+        $q = slugToSearchQuery($notFoundPath);
+        header('Location: /search' . ($q !== '' ? '?q=' . urlencode($q) : ''), true, 302);
+        exit;
 
     case 'list':
     default:
diff --git a/public/version.txt b/public/version.txt
index 7e84a78..9494224 100644
--- a/public/version.txt
+++ b/public/version.txt
@@ -1 +1 @@
-1.6.15
+1.6.16
diff --git a/src/SearchLogParser.php b/src/SearchLogParser.php
index 63b092e..90c8025 100644
--- a/src/SearchLogParser.php
+++ b/src/SearchLogParser.php
@@ -8,22 +8,25 @@ class SearchLogParser
     private string $vhostBase;
     private string $cacheFile;
     private int    $cacheTtl;
+    private int    $days;
 
     public function __construct(
         string $logDir    = '/var/log/apache2',
         string $vhostBase = '*-access.log',
         string $cacheFile = '',
-        int    $cacheTtl  = 600
+        int    $cacheTtl  = 600,
+        int    $days      = 14
     ) {
         $this->logDir    = rtrim($logDir, '/');
         $this->vhostBase = $vhostBase;
+        $this->days      = max(1, min(30, $days));
         $this->cacheFile = $cacheFile !== ''
             ? $cacheFile
-            : dirname(__DIR__) . '/_cache/search_terms.json';
+            : dirname(__DIR__) . '/_cache/search_terms_' . $this->days . 'd.json';
         $this->cacheTtl  = $cacheTtl;
     }
 
-    /** @return array<string,int> terme => nombre d'occurrences, trié desc */
+    /** @return array<string,int> terme => visiteurs uniques, trié desc */
     public function topTerms(int $limit = 100): array
     {
         if ($this->cacheValid()) {
@@ -33,9 +36,14 @@ class SearchLogParser
             }
         }
 
-        $counts = [];
+        $visitors = [];  // terme => [ip => true]
         foreach ($this->logFiles() as $file) {
-            $this->parseFile($file, $counts);
+            $this->parseFile($file, $visitors);
+        }
+
+        $counts = [];
+        foreach ($visitors as $term => $ips) {
+            $counts[$term] = count($ips);
         }
         arsort($counts);
 
@@ -61,6 +69,7 @@ class SearchLogParser
     {
         $pattern = $this->logDir . '/' . $this->vhostBase;
         $files   = [];
+        $cutoff  = time() - $this->days * 86400;
 
         // Fichiers correspondant au pattern de base (courants + rotations incluses si glob)
         $bases = glob($pattern) ?: [];
@@ -75,6 +84,9 @@ class SearchLogParser
                 if (!is_readable($path)) {
                     continue;
                 }
+                if (@filemtime($path) < $cutoff) {
+                    continue;
+                }
                 if (str_ends_with($path, '.tar.gz')) {
                     $files[] = ['path' => $path, 'type' => 'tgz'];
                 } elseif (str_ends_with($path, '.gz')) {
@@ -88,7 +100,7 @@ class SearchLogParser
         return $files;
     }
 
-    private function parseFile(array $file, array &$counts): void
+    private function parseFile(array $file, array &$visitors): void
     {
         if ($file['type'] === 'tgz') {
             try {
@@ -99,7 +111,7 @@ class SearchLogParser
                         continue;
                     }
                     foreach (explode("\n", $content) as $line) {
-                        $this->parseLine($line, $counts);
+                        $this->parseLine($line, $visitors);
                     }
                 }
             } catch (\Exception $e) {
@@ -113,7 +125,7 @@ class SearchLogParser
             while (!gzeof($h)) {
                 $line = gzgets($h, 8192);
                 if ($line !== false) {
-                    $this->parseLine($line, $counts);
+                    $this->parseLine($line, $visitors);
                 }
             }
             gzclose($h);
@@ -123,28 +135,29 @@ class SearchLogParser
                 return;
             }
             while (($line = fgets($h)) !== false) {
-                $this->parseLine($line, $counts);
+                $this->parseLine($line, $visitors);
             }
             fclose($h);
         }
     }
 
-    private function parseLine(string $line, array &$counts): void
+    private function parseLine(string $line, array &$visitors): void
     {
         if (!str_contains($line, 'GET /search?')) {
             return;
         }
-        if (!preg_match('/"GET \/search\?([^"]*) HTTP\//', $line, $m)) {
+        if (!preg_match('/^(\S+) \S+ \S+ \[[^\]]+\] "GET \/search\?([^"]*) HTTP\//', $line, $m)) {
             return;
         }
 
-        parse_str($m[1], $params);
+        $ip = $m[1];
+        parse_str($m[2], $params);
         $q = trim(urldecode($params['q'] ?? ''));
 
         if ($q === '' || mb_strlen($q) > 200) {
             return;
         }
         $q = mb_strtolower($q);
-        $counts[$q] = ($counts[$q] ?? 0) + 1;
+        $visitors[$q][$ip] = true;
     }
 }
diff --git a/templates/admin.php b/templates/admin.php
index d0dedaf..6acda9b 100644
--- a/templates/admin.php
+++ b/templates/admin.php
@@ -1207,7 +1207,15 @@ foreach (COLOR_PALETTE_16 as $_i => $_rgb):
         <h5 class="mb-0">Termes recherchés
             <span class="badge bg-secondary ms-1"><?= count($adminData['search_terms'] ?? []) ?></span>
         </h5>
-        <span class="text-muted small">Derniers 14 jours de logs · cache 10 min</span>
+        <div class="d-flex align-items-center gap-3">
+            <span class="text-muted small">Derniers <?= (int)($adminData['search_days'] ?? 14) ?> jours · cache 10 min</span>
+            <div class="btn-group btn-group-sm" role="group">
+                <a href="/admin/searches?days=7"
+                   class="btn <?= ($adminData['search_days'] ?? 14) === 7 ? 'btn-primary' : 'btn-outline-secondary' ?>">7 j</a>
+                <a href="/admin/searches"
+                   class="btn <?= ($adminData['search_days'] ?? 14) === 14 ? 'btn-primary' : 'btn-outline-secondary' ?>">14 j</a>
+            </div>
+        </div>
     </div>
 
     <?php if (!($adminData['search_log_readable'] ?? false)): ?>
@@ -1228,7 +1236,7 @@ foreach (COLOR_PALETTE_16 as $_i => $_rgb):
                 <tr>
                     <th style="width:3rem">#</th>
                     <th>Terme recherché</th>
-                    <th style="width:6rem" class="text-end">Fois</th>
+                    <th style="width:6rem" class="text-end">Visiteurs</th>
                     <th style="width:12rem"></th>
                 </tr>
             </thead>
diff --git a/templates/edit_tags.php b/templates/edit_tags.php
index 7621331..99007b2 100644
--- a/templates/edit_tags.php
+++ b/templates/edit_tags.php
@@ -97,8 +97,10 @@ $_typeLabel  = $isCatField ? 'Catégorie' : ($tagTypes[$tagType] ?? ucfirst($tag
 
     <?php renderTagGroup('Déjà taggués', $_current, true); ?>
     <?php renderTagGroup('Valeurs connues dans d\'autres articles', $_known, false); ?>
+    <?php if (empty($_known)): ?>
     <?php renderTagGroup('Abréviations détectées', $_abbrevs, false, true); ?>
     <?php renderTagGroup('Noms composés détectés', $_camel + $_proper, false, true); ?>
+    <?php endif; ?>
 
     <?php if (empty($suggestions)): ?>
         <p class="text-muted">Aucun terme détecté dans cet article.</p>