diff --git a/includes/class-helpers.php b/includes/class-helpers.php
index e6de1d6..341a3a8 100644
--- a/includes/class-helpers.php
+++ b/includes/class-helpers.php
@@ -8,12 +8,14 @@ final class Helpers
     private static ?string $current_town_memo = null;
     private static bool $current_town_resolved = false;
     private static array $term_cache = [];
+    private static array $page_unic_cache = [];
 
     public static function reset_cache(): void
     {
         self::$current_town_memo = null;
         self::$current_town_resolved = false;
         self::$term_cache = [];
+        self::$page_unic_cache = [];
     }
 
     public static function get_term_by_slug(string $slug, string $taxonomy = 'town'): ?\WP_Term
@@ -112,6 +114,36 @@ final class Helpers
         return is_string($value) && $value !== '' ? $value : null;
     }
 
+    public static function page_unic_swap(int $page_id_old, string $town_slug): ?int
+    {
+        $key = $page_id_old . '|' . $town_slug;
+        if (array_key_exists($key, self::$page_unic_cache)) {
+            return self::$page_unic_cache[$key];
+        }
+        $term = self::get_term_by_slug($town_slug);
+        if ($term === null) {
+            return self::$page_unic_cache[$key] = null;
+        }
+        if (!\function_exists('get_field')) {
+            return self::$page_unic_cache[$key] = null;
+        }
+        $rows = \get_field('page_unic', 'option');
+        if (!is_array($rows)) {
+            return self::$page_unic_cache[$key] = null;
+        }
+        foreach ($rows as $row) {
+            if (!is_array($row)) {
+                continue;
+            }
+            if ((int) ($row['town'] ?? 0) === (int) $term->term_id
+                && (int) ($row['page_old'] ?? 0) === $page_id_old) {
+                $new = (int) ($row['page_new'] ?? 0);
+                return self::$page_unic_cache[$key] = $new > 0 ? $new : null;
+            }
+        }
+        return self::$page_unic_cache[$key] = null;
+    }
+
     public static function is_routable_path(?string $path = null): bool
     {
         if ($path === null) {
diff --git a/tests/HelpersTest.php b/tests/HelpersTest.php
index e24694c..7595d32 100644
--- a/tests/HelpersTest.php
+++ b/tests/HelpersTest.php
@@ -265,4 +265,50 @@ final class HelpersTest extends TestCase
 
         self::assertFalse(Helpers::is_routable_path());
     }
+
+    public function test_page_unic_swap_returns_clone_id_when_row_matches(): void
+    {
+        $term = new \WP_Term();
+        $term->term_id = 11;
+        $term->slug = 'tyumen';
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);
+        \Brain\Monkey\Functions\expect('get_field')
+            ->once()
+            ->with('page_unic', 'option')
+            ->andReturn([
+                ['town' => 10, 'page_old' => 5, 'page_new' => 50],
+                ['town' => 11, 'page_old' => 7, 'page_new' => 70],
+            ]);
+
+        self::assertSame(70, Helpers::page_unic_swap(7, 'tyumen'));
+    }
+
+    public function test_page_unic_swap_returns_null_when_no_row_matches(): void
+    {
+        $term = new \WP_Term();
+        $term->term_id = 11;
+        $term->slug = 'tyumen';
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);
+        \Brain\Monkey\Functions\expect('get_field')
+            ->once()
+            ->andReturn([['town' => 10, 'page_old' => 5, 'page_new' => 50]]);
+
+        self::assertNull(Helpers::page_unic_swap(7, 'tyumen'));
+    }
+
+    public function test_page_unic_swap_caches_within_request(): void
+    {
+        $term = new \WP_Term();
+        $term->term_id = 11;
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);
+        \Brain\Monkey\Functions\expect('get_field')
+            ->once()
+            ->andReturn([['town' => 11, 'page_old' => 7, 'page_new' => 70]]);
+
+        Helpers::page_unic_swap(7, 'tyumen');
+        Helpers::page_unic_swap(7, 'tyumen');
+        Helpers::page_unic_swap(7, 'tyumen');
+
+        self::assertTrue(true);
+    }
 }