fix: remove 2026_03_28_050000_lowercase_existing_emails.php

database/migrations/2026_03_28_050000_lowercase_existing_emails.php

@@ -1,38 +0,0 @@
-<?php
-
-use Illuminate\Database\Migrations\Migration;
-use Illuminate\Support\Facades\DB;
-use Illuminate\Support\Facades\Log;
-
-return new class extends Migration
-{
-    /**
-     * Run the migrations.
-     */
-    public function up(): void
-    {
-        // 统计需要转换的记录数
-        $count = DB::table('v2_user')
-            ->whereNotNull('email')
-            ->whereRaw('email != LOWER(email)')
-            ->count();
-
-        if ($count > 0) {
-            Log::info("Converting {$count} email(s) to lowercase");
-            DB::table('v2_user')
-                ->whereNotNull('email')
-                ->whereRaw('email != LOWER(email)')
-                ->update(['email' => DB::raw('LOWER(email)')]);
-                
-            Log::info("Email lowercase conversion completed");
-        }
-    }
-
-    /**
-     * Reverse the migrations.
-     */
-    public function down(): void
-    {
-        // 无法恢复原始大小写
-    }
-};