大量消息收件箱完成第一层性能优化

src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260810090831_OptimizeNotificationInboxIndexes.cs

@@ -0,0 +1,63 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
+{
+    /// <inheritdoc />
+    public partial class OptimizeNotificationInboxIndexes : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_UserId_Category_CreatedAt",
+                table: "Notifications");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_UserId_IsRead",
+                table: "Notifications");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_UserId_Category_CreatedAt_Id",
+                table: "Notifications",
+                columns: new[] { "UserId", "Category", "CreatedAt", "Id" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_UserId_CreatedAt_Id",
+                table: "Notifications",
+                columns: new[] { "UserId", "CreatedAt", "Id" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_UserId_IsRead_CreatedAt_Id",
+                table: "Notifications",
+                columns: new[] { "UserId", "IsRead", "CreatedAt", "Id" });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_UserId_Category_CreatedAt_Id",
+                table: "Notifications");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_UserId_CreatedAt_Id",
+                table: "Notifications");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_UserId_IsRead_CreatedAt_Id",
+                table: "Notifications");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_UserId_Category_CreatedAt",
+                table: "Notifications",
+                columns: new[] { "UserId", "Category", "CreatedAt" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_UserId_IsRead",
+                table: "Notifications",
+                columns: new[] { "UserId", "IsRead" });
+        }
+    }
+}

src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/AppDbContextModelSnapshot.cs

@@ -3417,9 +3417,11 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
 
                     b.HasIndex("MessageDispatchId");
 
-                    b.HasIndex("UserId", "IsRead");
+                    b.HasIndex("UserId", "CreatedAt", "Id");
 
-                    b.HasIndex("UserId", "Category", "CreatedAt");
+                    b.HasIndex("UserId", "Category", "CreatedAt", "Id");
+
+                    b.HasIndex("UserId", "IsRead", "CreatedAt", "Id");
 
                     b.ToTable("Notifications");
                 });