From b8a6c9d0c2dac9bd0982413beee4364663cbe0ac Mon Sep 17 00:00:00 2001
From: pllx <pllx@users.noreply.github.com>
Date: Tue, 30 Jun 2026 11:38:38 +0800
Subject: [PATCH] =?UTF-8?q?perf:=20=E7=BC=96=E5=86=99=E5=B9=B6=E6=89=A7?=
 =?UTF-8?q?=E8=A1=8C=E6=95=B0=E6=8D=AE=E5=BA=93=E8=BF=81=E7=A7=BB=EF=BC=8C?=
 =?UTF-8?q?=E4=B8=BA=20messages=20=E8=A1=A8=E6=B7=BB=E5=8A=A0=20(room=5Fid?=
 =?UTF-8?q?,=20sent=5Fat)=20=E8=81=94=E5=90=88=E7=B4=A2=E5=BC=95=E4=BB=A5?=
 =?UTF-8?q?=E6=B6=88=E9=99=A4=E6=85=A2=E6=9F=A5=E8=AF=A2?=
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---
 ...0_add_compound_index_to_messages_table.php | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 database/migrations/2026_06_30_114000_add_compound_index_to_messages_table.php

diff --git a/database/migrations/2026_06_30_114000_add_compound_index_to_messages_table.php b/database/migrations/2026_06_30_114000_add_compound_index_to_messages_table.php
new file mode 100644
index 0000000..048b2cc
--- /dev/null
+++ b/database/migrations/2026_06_30_114000_add_compound_index_to_messages_table.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * 文件功能：为消息表（messages）添加 (room_id, sent_at) 联合复合索引
+ * 解决拉取房间聊天历史消息时的 Slow Query 瓶颈
+ *
+ * @author   ChatRoom Laravel
+ * @version  1.0.0
+ */
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * 执行迁移，添加联合索引
+     */
+    public function up(): void
+    {
+        Schema::table('messages', function (Blueprint $table) {
+            // 添加复合索引 idx_room_sent_at
+            $table->index(['room_id', 'sent_at'], 'idx_room_sent_at');
+        });
+    }
+
+    /**
+     * 回滚迁移，删除联合索引
+     */
+    public function down(): void
+    {
+        Schema::table('messages', function (Blueprint $table) {
+            $table->dropIndex('idx_room_sent_at');
+        });
+    }
+};