diff --git a/plugins/neatstudio.link-tracker/database/migrations/2026_08_12_400000_create_redirects_table.php b/plugins/neatstudio.link-tracker/database/migrations/2026_08_12_400000_create_redirects_table.php
index a22788a..b0b1a08 100644
--- a/plugins/neatstudio.link-tracker/database/migrations/2026_08_12_400000_create_redirects_table.php
+++ b/plugins/neatstudio.link-tracker/database/migrations/2026_08_12_400000_create_redirects_table.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Schema;
 
 return new class extends Migration
@@ -24,7 +25,8 @@ return new class extends Migration
             $table->timestamp('last_clicked_at')->nullable();
             $table->timestamps();
 
-            $table->index('target_url');
+            // MySQL 5.7 不支持对 TEXT 建全值索引，用前缀索引
+            $table->index([DB::raw('target_url(191)')], 'redirects_target_url_index');
         });
     }