diff --git a/api/index.php b/api/index.php
index d651c39..0793d77 100644
--- a/api/index.php
+++ b/api/index.php
@@ -8990,7 +8990,7 @@ function importMergeBackup(PDO $db): void {
 
     $db->beginTransaction();
     try {
-        // --- 1. Tables référentielles simples : skip si key existe ---
+// --- 1. Tables référentielles simples : upsert (update label/icon si key existe déjà) ---
         $refTables = [
             'categories'    => ['key'],
             'locations'     => ['key'],
@@ -9004,9 +9004,20 @@ function importMergeBackup(PDO $db): void {
                 $where = [];
                 $params = [];
                 foreach ($uniqueCols as $c) { $where[] = "$c = ?"; $params[] = $row[$c]; }
-                $exists = $db->prepare("SELECT 1 FROM {$table} WHERE " . implode(' AND ', $where));
+                $exists = $db->prepare("SELECT id FROM {$table} WHERE " . implode(' AND ', $where));
                 $exists->execute($params);
-                if ($exists->fetch()) continue;
+                $existingId = $exists->fetchColumn();
+                if ($existingId) {
+                    // Update label/icon (and keywords if present) from prod, keep local id/is_builtin
+                    $updCols = array_diff(array_keys($row), $uniqueCols, ['is_builtin', 'sort_order']);
+                    if (!empty($updCols)) {
+                        $setClause = implode(', ', array_map(fn($c) => "$c = ?", $updCols));
+                        $updParams = array_map(fn($c) => $row[$c], $updCols);
+                        $updParams[] = $existingId;
+                        $db->prepare("UPDATE {$table} SET {$setClause} WHERE id = ?")->execute($updParams);
+                    }
+                    continue;
+                }
                 $cols = array_keys($row);
                 $stmt = $db->prepare("INSERT INTO {$table} (" . implode(',', $cols) . ") VALUES (" . implode(',', array_fill(0, count($cols), '?')) . ")");
                 $stmt->execute(array_values($row));