fix: ticket reply_status semantics, N+1 query, and admin reply auto-reopen

database/migrations/2026_04_21_000001_fix_ticket_reply_status.php

@@ -0,0 +1,50 @@
+<?php
+
+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
+{
+    public function up(): void
+    {
+        // Add last_reply_user_id column if not exists
+        if (!Schema::hasColumn('v2_ticket', 'last_reply_user_id')) {
+            Schema::table('v2_ticket', function (Blueprint $table) {
+                $table->integer('last_reply_user_id')->nullable()->after('reply_status');
+            });
+        }
+
+        // Fix reply_status semantics: swap 0 and 1
+        // Old: 0=admin replied, 1=user replied (inverted)
+        // New: 0=待回复(waiting), 1=已回复(replied) — matches frontend expectations
+        DB::table('v2_ticket')
+            ->whereIn('reply_status', [0, 1])
+            ->update([
+                'reply_status' => DB::raw("CASE WHEN reply_status = 0 THEN 1 WHEN reply_status = 1 THEN 0 END")
+            ]);
+
+        // Fix default: new tickets should be "待回复" (0), not "已回复" (1)
+        Schema::table('v2_ticket', function (Blueprint $table) {
+            $table->integer('reply_status')->default(0)->comment('0:待回复 1:已回复')->change();
+        });
+    }
+
+    public function down(): void
+    {
+        // Reverse the swap
+        DB::table('v2_ticket')
+            ->whereIn('reply_status', [0, 1])
+            ->update([
+                'reply_status' => DB::raw("CASE WHEN reply_status = 0 THEN 1 WHEN reply_status = 1 THEN 0 END")
+            ]);
+
+        Schema::table('v2_ticket', function (Blueprint $table) {
+            $table->integer('reply_status')->default(1)->comment('0:待回复 1:已回复')->change();
+        });
+
+        // Note: last_reply_user_id column is intentionally kept to avoid dropping
+        // a column that may have existed before this migration.
+    }
+};