仪表盘和 6 类统计摘要接入 HybridCache（内存 + Redis）。

默认 Redis 缓存 3 分钟、本地缓存 30 秒，可通过环境变量调整。
缓存键包含数据权限范围、有效学院和全部筛选条件，避免跨学院串数据。
Excel 导出保持实时查询，不使用摘要缓存。
无需数据库迁移。

.env.example

@@ -15,6 +15,8 @@ Cache__ReferenceExpirationMinutes=30
 Cache__ReferenceLocalExpirationSeconds=120
 Cache__TimetableExpirationMinutes=10
 Cache__TimetableLocalExpirationSeconds=30
+Cache__AnalyticsExpirationMinutes=3
+Cache__AnalyticsLocalExpirationSeconds=30
 Cache__MaximumPayloadKilobytes=2048
 
 Jwt__Issuer=Jiaowu.Api

README.md

@@ -225,8 +225,9 @@ SQLite 只用于本地开发：新库通过 `EnsureCreated` 建立，已有开
 ### 查询缓存与 Redis
 
 应用使用 HybridCache 统一管理进程内一级缓存和可选 Redis 二级缓存。目前缓存范围为
-学生激活/基础数据选项以及匿名可访问的已发布课表；选课容量、成绩、考勤、审批、通知
-未读数、权限和后台任务状态仍直接以 MySQL 为准。
+学生激活/基础数据选项、匿名可访问的已发布课表、仪表盘以及统计分析摘要。统计缓存键
+包含有效数据范围、学院和规范化筛选条件，避免跨学院复用；统计 Excel 导出仍实时查询。
+选课容量、成绩写入、考勤、审批、通知未读数、权限和后台任务状态仍直接以 MySQL 为准。
 
 不配置 `ConnectionStrings__Redis` 时，开发和单机部署仍使用进程内缓存，不要求安装
 Redis。生产环境使用 Redis 时，通过环境变量配置连接串，例如：
@@ -235,6 +236,10 @@ Redis。生产环境使用 Redis 时，通过环境变量配置连接串，例
 ConnectionStrings__Redis=redis.internal:6380,user=jiaowu,password=REPLACE_ME,ssl=true,abortConnect=false
 ```
 
+仪表盘和统计摘要默认在 Redis 中缓存 3 分钟、进程内缓存 30 秒，可分别通过
+`Cache__AnalyticsExpirationMinutes` 和 `Cache__AnalyticsLocalExpirationSeconds`
+调整。该类汇总采用短 TTL 控制数据新鲜度，不要求每个业务写入点同步清理缓存。
+
 Redis 只作为可丢弃的查询缓存。连接失败时应用回源数据库，普通启动和
 `/health/ready` 不依赖 Redis；可以单独检查 `/health/cache`。缓存键自动包含运行环境，
 同一 Redis 可以安全承载 Development、Staging 和 Production，但生产环境仍建议使用

src/Jiaowu.Api/Controllers/DashboardController.cs

@@ -1,18 +1,35 @@
+using System.Text.Json;
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
 
 namespace Jiaowu.Api.Controllers;
 
 [ApiController]
 [Authorize]
 [Route("api/dashboard")]
-public sealed class DashboardController(AppDbContext db) : ControllerBase
+public sealed class DashboardController(
+    AppDbContext db,
+    IAppCache appCache,
+    IOptions<JsonOptions> jsonOptions) : ControllerBase
 {
     [HttpGet]
     public async Task<ActionResult<object>> Get(CancellationToken cancellationToken)
+    {
+        var response = await appCache.GetOrCreateAsync(
+            AppCacheKeys.Dashboard,
+            LoadAsync,
+            AppCacheProfile.Analytics,
+            [AppCacheTags.Analytics],
+            cancellationToken);
+        return response;
+    }
+
+    private async Task<JsonElement> LoadAsync(CancellationToken cancellationToken)
     {
         var currentTerm = await db.AcademicTerms
             .AsNoTracking()
@@ -20,64 +37,66 @@ public sealed class DashboardController(AppDbContext db) : ControllerBase
             .Select(x => new { x.Id, x.Name, x.StartDate, x.EndDate })
             .FirstOrDefaultAsync(cancellationToken);
 
-        return new
-        {
-            CurrentTerm = currentTerm,
-            Counts = new
+        return JsonSerializer.SerializeToElement(
+            new
             {
-                Campuses = await db.Campuses.CountAsync(cancellationToken),
-                Colleges = await db.Colleges.CountAsync(cancellationToken),
-                Majors = await db.Majors.CountAsync(cancellationToken),
-                Classes = await db.AdministrativeClasses.CountAsync(cancellationToken),
-                Classrooms = await db.Classrooms.CountAsync(cancellationToken),
-                Teachers = await db.Teachers.CountAsync(cancellationToken),
-                Students = await db.Students.CountAsync(cancellationToken),
-                Courses = await db.Courses.CountAsync(cancellationToken),
-                CurriculumPlans = await db.CurriculumPlans.CountAsync(cancellationToken),
-                TeachingTasks = await db.TeachingTasks.CountAsync(cancellationToken),
-                SchedulePlans = await db.SchedulePlans.CountAsync(cancellationToken),
-                CourseSelectionRounds = await db.CourseSelectionRounds
-                    .CountAsync(cancellationToken),
-                CourseSelectionOfferings = await db.CourseSelectionOfferings
-                    .CountAsync(cancellationToken),
-                CourseEnrollments = await db.CourseEnrollments
-                    .CountAsync(
-                        x => x.Status == CourseEnrollmentStatus.Enrolled,
+                CurrentTerm = currentTerm,
+                Counts = new
+                {
+                    Campuses = await db.Campuses.CountAsync(cancellationToken),
+                    Colleges = await db.Colleges.CountAsync(cancellationToken),
+                    Majors = await db.Majors.CountAsync(cancellationToken),
+                    Classes = await db.AdministrativeClasses.CountAsync(cancellationToken),
+                    Classrooms = await db.Classrooms.CountAsync(cancellationToken),
+                    Teachers = await db.Teachers.CountAsync(cancellationToken),
+                    Students = await db.Students.CountAsync(cancellationToken),
+                    Courses = await db.Courses.CountAsync(cancellationToken),
+                    CurriculumPlans = await db.CurriculumPlans.CountAsync(cancellationToken),
+                    TeachingTasks = await db.TeachingTasks.CountAsync(cancellationToken),
+                    SchedulePlans = await db.SchedulePlans.CountAsync(cancellationToken),
+                    CourseSelectionRounds = await db.CourseSelectionRounds
+                        .CountAsync(cancellationToken),
+                    CourseSelectionOfferings = await db.CourseSelectionOfferings
+                        .CountAsync(cancellationToken),
+                    CourseEnrollments = await db.CourseEnrollments
+                        .CountAsync(
+                            x => x.Status == CourseEnrollmentStatus.Enrolled,
+                            cancellationToken),
+                    GradeSheets = await db.GradeSheets.CountAsync(cancellationToken),
+                    PublishedGradeSheets = await db.GradeSheets.CountAsync(
+                        x => x.Status == GradeSheetStatus.Published,
                         cancellationToken),
-                GradeSheets = await db.GradeSheets.CountAsync(cancellationToken),
-                PublishedGradeSheets = await db.GradeSheets.CountAsync(
-                    x => x.Status == GradeSheetStatus.Published,
-                    cancellationToken),
-                GradeRecords = await db.GradeRecords.CountAsync(cancellationToken),
-                ExamPlans = await db.ExamPlans.CountAsync(cancellationToken),
-                ExamSessions = await db.ExamSessions.CountAsync(cancellationToken),
-                StudentStatusChanges = await db.StudentStatusChanges
-                    .CountAsync(cancellationToken),
-                PendingStudentStatusChanges = await db.StudentStatusChanges.CountAsync(
-                    x => x.State == StudentStatusChangeState.Submitted ||
-                         x.State == StudentStatusChangeState.CounselorApproved ||
-                         x.State == StudentStatusChangeState.CollegeApproved,
-                    cancellationToken),
-                GraduationAuditBatches = await db.GraduationAuditBatches
-                    .CountAsync(cancellationToken),
-                PublishedGraduationAuditBatches = await db.GraduationAuditBatches
-                    .CountAsync(
-                        x => x.Status == GraduationAuditBatchStatus.Published,
+                    GradeRecords = await db.GradeRecords.CountAsync(cancellationToken),
+                    ExamPlans = await db.ExamPlans.CountAsync(cancellationToken),
+                    ExamSessions = await db.ExamSessions.CountAsync(cancellationToken),
+                    StudentStatusChanges = await db.StudentStatusChanges
+                        .CountAsync(cancellationToken),
+                    PendingStudentStatusChanges = await db.StudentStatusChanges.CountAsync(
+                        x => x.State == StudentStatusChangeState.Submitted ||
+                             x.State == StudentStatusChangeState.CounselorApproved ||
+                             x.State == StudentStatusChangeState.CollegeApproved,
                         cancellationToken),
-                DegreeAwardBatches = await db.DegreeAwardBatches
-                    .CountAsync(cancellationToken),
-                PublishedDegreeAwardBatches = await db.DegreeAwardBatches
-                    .CountAsync(
-                        x => x.Status == DegreeAwardBatchStatus.Published,
-                        cancellationToken),
-                GraduationClearanceBatches = await db.GraduationClearanceBatches
-                    .CountAsync(cancellationToken),
-                OpenGraduationClearanceBatches = await db.GraduationClearanceBatches
-                    .CountAsync(
-                        x => x.Status == GraduationClearanceBatchStatus.Open,
-                        cancellationToken),
-                Users = await db.Users.CountAsync(cancellationToken)
-            }
-        };
+                    GraduationAuditBatches = await db.GraduationAuditBatches
+                        .CountAsync(cancellationToken),
+                    PublishedGraduationAuditBatches = await db.GraduationAuditBatches
+                        .CountAsync(
+                            x => x.Status == GraduationAuditBatchStatus.Published,
+                            cancellationToken),
+                    DegreeAwardBatches = await db.DegreeAwardBatches
+                        .CountAsync(cancellationToken),
+                    PublishedDegreeAwardBatches = await db.DegreeAwardBatches
+                        .CountAsync(
+                            x => x.Status == DegreeAwardBatchStatus.Published,
+                            cancellationToken),
+                    GraduationClearanceBatches = await db.GraduationClearanceBatches
+                        .CountAsync(cancellationToken),
+                    OpenGraduationClearanceBatches = await db.GraduationClearanceBatches
+                        .CountAsync(
+                            x => x.Status == GraduationClearanceBatchStatus.Open,
+                            cancellationToken),
+                    Users = await db.Users.CountAsync(cancellationToken)
+                }
+            },
+            jsonOptions.Value.JsonSerializerOptions);
     }
 }