diff --git a/database/migrations/2026_09_21_104848_add_foreign_key_class_characteristic_id_columns_to_sticker_mapping_masters.php b/database/migrations/2026_09_21_104848_add_foreign_key_class_characteristic_id_columns_to_sticker_mapping_masters.php
new file mode 100644
index 0000000..2b15fb4
--- /dev/null
+++ b/database/migrations/2026_09_21_104848_add_foreign_key_class_characteristic_id_columns_to_sticker_mapping_masters.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $sql = <<<'SQL'
+            ALTER TABLE sticker_mapping_masters
+            ADD COLUMN item_id BIGINT DEFAULT NULL,
+            ADD CONSTRAINT sticker_mapping_masters_item_id_fkey
+            FOREIGN KEY (item_id) REFERENCES items(id);
+        SQL;
+
+        DB::statement($sql);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('sticker_mapping_masters', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};