v1.2.0

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

@@ -6,6 +6,18 @@ Database__Provider=MySql
 Database__ApplyMigrationsOnStartup=false
 Database__CommandTimeoutSeconds=30
 ConnectionStrings__MySql="Server=db.example.edu.cn;Port=3306;Database=jiaowu;User=APP_USER;Password=REPLACE_WITH_A_STRONG_PASSWORD;SslMode=VerifyFull;SslCa=/etc/jiaowu/mysql-ca.pem;"
+# Redis 是可选加速器；留空时应用仅使用进程内缓存。
+# ConnectionStrings__Redis="redis.example.edu.cn:6380,user=jiaowu,password=REPLACE_WITH_A_STRONG_PASSWORD,ssl=true,abortConnect=false"
+
+Cache__Enabled=true
+Cache__KeyPrefix=jiaowu:v1
+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
 Jwt__Audience=Jiaowu.Web

README.md

@@ -219,6 +219,35 @@ SQLite 只用于本地开发：新库通过 `EnsureCreated` 建立，已有开
 
 - `/health/live`：只检查进程存活。
 - `/health`、`/health/ready`：实际检查数据库连接，失败时返回 HTTP 503。
+- `/health/cache`：检查可选 Redis；未配置 Redis 时返回 `disabled`，Redis
+  故障不会影响数据库就绪探针。
+
+### 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、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：
+
+```text
+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
+独立实例、私有网络、ACL 和 TLS。
+
+`compose.example.yml` 包含不暴露宿主机端口的 Redis 服务，限制为 256 MB 并使用
+`allkeys-lfu` 淘汰策略，不启用持久化。`compose.app.example.yml` 不创建 Redis；
+如需连接外部 Redis，在 `.env` 中配置上述连接串即可。
 
 ## 跨平台发布与 Docker
 

compose.example.yml

@@ -13,6 +13,9 @@ x-jiaowu-environment: &jiaowu-environment
   Database__ApplyMigrationsOnStartup: "false"
   Database__CommandTimeoutSeconds: "30"
   ConnectionStrings__MySql: "Server=mysql;Port=3306;Database=${MYSQL_DATABASE:-jiaowu_demo};User=${MYSQL_USER:-jiaowu};Password=${MYSQL_PASSWORD:?请在 .env.docker 中设置 MYSQL_PASSWORD};SslMode=Disabled;"
+  ConnectionStrings__Redis: "redis:6379,abortConnect=false"
+  Cache__Enabled: "true"
+  Cache__KeyPrefix: "jiaowu:v1"
   Jwt__Issuer: Jiaowu.Api
   Jwt__Audience: Jiaowu.Web
   Jwt__Key: "${JWT_KEY:?请在 .env.docker 中设置 JWT_KEY}"
@@ -30,6 +33,29 @@ x-json-logging: &json-logging
     max-file: "3"
 
 services:
+  redis:
+    image: redis:8.8-alpine
+    restart: unless-stopped
+    command:
+      - redis-server
+      - --save
+      - ""
+      - --appendonly
+      - "no"
+      - --maxmemory
+      - 256mb
+      - --maxmemory-policy
+      - allkeys-lfu
+    healthcheck:
+      test:
+        - CMD
+        - redis-cli
+        - ping
+      interval: 5s
+      timeout: 3s
+      retries: 10
+    logging: *json-logging
+
   mysql:
     image: mysql:8.4
     restart: unless-stopped
@@ -69,6 +95,8 @@ services:
     <<: *jiaowu-image
     environment: *jiaowu-environment
     depends_on:
+      redis:
+        condition: service_started
       mysql:
         condition: service_healthy
       migrate:

src/Jiaowu.Api/Controllers/AuthController.cs

@@ -3,6 +3,7 @@ using System.Security.Claims;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
@@ -17,35 +18,51 @@ namespace Jiaowu.Api.Controllers;
 public sealed class AuthController(
     AppDbContext db,
     UserManager<ApplicationUser> userManager,
-    ITokenService tokenService) : ControllerBase
+    ITokenService tokenService,
+    IAppCache cache) : ControllerBase
 {
     [AllowAnonymous]
     [HttpGet("activation-options")]
     public async Task<ActionResult> GetActivationOptions(CancellationToken cancellationToken)
     {
-        var colleges = await db.Colleges.AsNoTracking()
-            .Where(x => x.IsEnabled)
-            .OrderBy(x => x.Code)
-            .Select(x => new { x.Id, x.Code, x.Name })
-            .ToListAsync(cancellationToken);
-        var majors = await db.Majors.AsNoTracking()
-            .Where(x => x.IsEnabled && x.College!.IsEnabled)
-            .OrderBy(x => x.Code)
-            .Select(x => new { x.Id, x.Code, x.Name, x.CollegeId })
-            .ToListAsync(cancellationToken);
-        var classes = await db.AdministrativeClasses.AsNoTracking()
-            .Where(x => x.IsEnabled && x.Major!.IsEnabled && x.Major.College!.IsEnabled)
-            .OrderByDescending(x => x.Grade)
-            .ThenBy(x => x.Code)
-            .Select(x => new { x.Id, x.Code, x.Name, x.Grade, x.MajorId })
-            .ToListAsync(cancellationToken);
-        return Ok(new
-        {
-            Colleges = colleges,
-            Majors = majors,
-            Classes = classes,
-            Grades = classes.Select(x => x.Grade).Distinct().OrderByDescending(x => x)
-        });
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.ActivationOptions,
+            async token =>
+            {
+                var colleges = await db.Colleges.AsNoTracking()
+                    .Where(x => x.IsEnabled)
+                    .OrderBy(x => x.Code)
+                    .Select(x => new ActivationCollegeOption(x.Id, x.Code, x.Name))
+                    .ToListAsync(token);
+                var majors = await db.Majors.AsNoTracking()
+                    .Where(x => x.IsEnabled && x.College!.IsEnabled)
+                    .OrderBy(x => x.Code)
+                    .Select(x => new ActivationMajorOption(
+                        x.Id, x.Code, x.Name, x.CollegeId))
+                    .ToListAsync(token);
+                var classes = await db.AdministrativeClasses.AsNoTracking()
+                    .Where(x =>
+                        x.IsEnabled &&
+                        x.Major!.IsEnabled &&
+                        x.Major.College!.IsEnabled)
+                    .OrderByDescending(x => x.Grade)
+                    .ThenBy(x => x.Code)
+                    .Select(x => new ActivationClassOption(
+                        x.Id, x.Code, x.Name, x.Grade, x.MajorId))
+                    .ToListAsync(token);
+                return new ActivationOptionsResponse(
+                    colleges,
+                    majors,
+                    classes,
+                    classes.Select(x => x.Grade)
+                        .Distinct()
+                        .OrderByDescending(x => x)
+                        .ToList());
+            },
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
     }
 
     [AllowAnonymous]
@@ -219,3 +236,24 @@ public sealed record CurrentUserResponse(
     IEnumerable<string> Roles,
     Guid? CollegeId,
     string EffectiveDataScope);
+
+public sealed record ActivationOptionsResponse(
+    IReadOnlyList<ActivationCollegeOption> Colleges,
+    IReadOnlyList<ActivationMajorOption> Majors,
+    IReadOnlyList<ActivationClassOption> Classes,
+    IReadOnlyList<int> Grades);
+
+public sealed record ActivationCollegeOption(Guid Id, string Code, string Name);
+
+public sealed record ActivationMajorOption(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid CollegeId);
+
+public sealed record ActivationClassOption(
+    Guid Id,
+    string Code,
+    string Name,
+    int Grade,
+    Guid MajorId);

src/Jiaowu.Api/Controllers/BaseDataController.cs

@@ -2,6 +2,7 @@ using System.ComponentModel.DataAnnotations;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Common;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -12,7 +13,7 @@ namespace Jiaowu.Api.Controllers;
 [ApiController]
 [Authorize]
 [Route("api/base-data")]
-public sealed class BaseDataController(AppDbContext db) : ControllerBase
+public sealed class BaseDataController(AppDbContext db, IAppCache cache) : ControllerBase
 {
     private const string Administrators =
         $"{SystemRoles.SuperAdmin},{SystemRoles.AcademicAdmin}";
@@ -20,9 +21,14 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
     [HttpGet("campuses")]
     public async Task<ActionResult<IReadOnlyCollection<Campus>>> GetCampuses(
         CancellationToken cancellationToken) =>
-        await db.Campuses.AsNoTracking()
-            .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
-            .ToListAsync(cancellationToken);
+        await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("campuses"),
+            token => db.Campuses.AsNoTracking()
+                .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
 
     [HttpPost("campuses")]
     [Authorize(Roles = Administrators)]
@@ -52,21 +58,32 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         if (entity is null) return NotFound();
         ApplyCatalog(entity, request);
         entity.Address = request.Description?.Trim();
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
     [HttpGet("colleges")]
-    public async Task<ActionResult<object>> GetColleges(CancellationToken cancellationToken) =>
-        Ok(await db.Colleges.AsNoTracking()
-            .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id, x.Code, x.Name, x.ShortName, x.CampusId,
-                CampusName = x.Campus != null ? x.Campus.Name : null,
-                x.IsEnabled, x.SortOrder
-            })
-            .ToListAsync(cancellationToken));
+    public async Task<ActionResult<object>> GetColleges(CancellationToken cancellationToken)
+    {
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("colleges"),
+            token => db.Colleges.AsNoTracking()
+                .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
+                .Select(x => new CollegeListItem(
+                    x.Id,
+                    x.Code,
+                    x.Name,
+                    x.ShortName,
+                    x.CampusId,
+                    x.Campus != null ? x.Campus.Name : null,
+                    x.IsEnabled,
+                    x.SortOrder))
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
+    }
 
     [HttpPost("colleges")]
     [Authorize(Roles = Administrators)]
@@ -104,29 +121,46 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         ApplyCatalog(entity, request);
         entity.ShortName = request.ShortName?.Trim();
         entity.CampusId = request.CampusId;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
     [HttpGet("majors")]
-    public async Task<ActionResult<object>> GetMajors(CancellationToken cancellationToken) =>
-        Ok(await db.Majors.AsNoTracking()
-            .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id, x.Code, x.Name, x.CollegeId,
-                CollegeName = x.College!.Name,
-                x.DegreeType, x.SchoolingYears, x.IsEnabled, x.SortOrder
-            })
-            .ToListAsync(cancellationToken));
+    public async Task<ActionResult<object>> GetMajors(CancellationToken cancellationToken)
+    {
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("majors"),
+            token => db.Majors.AsNoTracking()
+                .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
+                .Select(x => new MajorListItem(
+                    x.Id,
+                    x.Code,
+                    x.Name,
+                    x.CollegeId,
+                    x.College!.Name,
+                    x.DegreeType,
+                    x.SchoolingYears,
+                    x.IsEnabled,
+                    x.SortOrder))
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
+    }
 
     [HttpGet("course-categories")]
     public async Task<ActionResult<IReadOnlyCollection<CourseCategory>>> GetCourseCategories(
         CancellationToken cancellationToken) =>
-        await db.CourseCategories.AsNoTracking()
-            .OrderBy(x => x.SortOrder)
-            .ThenBy(x => x.Code)
-            .ToListAsync(cancellationToken);
+        await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("course-categories"),
+            token => db.CourseCategories.AsNoTracking()
+                .OrderBy(x => x.SortOrder)
+                .ThenBy(x => x.Code)
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
 
     [HttpPost("course-categories")]
     [Authorize(Roles = Administrators)]
@@ -154,7 +188,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         var entity = await db.CourseCategories.FindAsync([id], cancellationToken);
         if (entity is null) return NotFound();
         ApplyCatalog(entity, request);
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
@@ -193,23 +227,35 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         entity.CollegeId = request.CollegeId;
         entity.DegreeType = request.DegreeType.Trim();
         entity.SchoolingYears = request.SchoolingYears;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
     [HttpGet("classes")]
-    public async Task<ActionResult<object>> GetClasses(CancellationToken cancellationToken) =>
-        Ok(await db.AdministrativeClasses.AsNoTracking()
-            .OrderByDescending(x => x.Grade).ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id, x.Code, x.Name, x.MajorId,
-                MajorName = x.Major!.Name,
-                CollegeName = x.Major.College!.Name,
-                x.Grade, x.CounselorUserId, x.CounselorName,
-                x.IsEnabled, x.SortOrder
-            })
-            .ToListAsync(cancellationToken));
+    public async Task<ActionResult<object>> GetClasses(CancellationToken cancellationToken)
+    {
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("classes"),
+            token => db.AdministrativeClasses.AsNoTracking()
+                .OrderByDescending(x => x.Grade).ThenBy(x => x.Code)
+                .Select(x => new AdministrativeClassListItem(
+                    x.Id,
+                    x.Code,
+                    x.Name,
+                    x.MajorId,
+                    x.Major!.Name,
+                    x.Major.College!.Name,
+                    x.Grade,
+                    x.CounselorUserId,
+                    x.CounselorName,
+                    x.IsEnabled,
+                    x.SortOrder))
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
+    }
 
     [HttpGet("counselors")]
     [Authorize(Roles = Administrators)]
@@ -279,18 +325,23 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         entity.Grade = request.Grade;
         entity.CounselorUserId = request.CounselorUserId;
         entity.CounselorName = counselorName;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
     [HttpGet("terms")]
     public async Task<ActionResult<IReadOnlyCollection<AcademicTerm>>> GetTerms(
         CancellationToken cancellationToken) =>
-        await db.AcademicTerms.AsNoTracking()
-            .OrderByDescending(x => x.IsCurrent)
-            .ThenBy(x => x.IsArchived)
-            .ThenByDescending(x => x.StartDate)
-            .ToListAsync(cancellationToken);
+        await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("terms"),
+            token => db.AcademicTerms.AsNoTracking()
+                .OrderByDescending(x => x.IsCurrent)
+                .ThenBy(x => x.IsArchived)
+                .ThenByDescending(x => x.StartDate)
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
 
     [HttpPost("terms")]
     [Authorize(Roles = Administrators)]
@@ -360,7 +411,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         entity.StartDate = request.StartDate;
         entity.EndDate = request.EndDate;
         entity.IsCurrent = request.IsCurrent;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
@@ -384,7 +435,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         foreach (var currentTerm in currentTerms)
             currentTerm.IsCurrent = false;
         entity.IsCurrent = true;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
@@ -402,7 +453,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
 
         entity.IsArchived = true;
         entity.ArchivedAt = DateTime.UtcNow;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
@@ -418,35 +469,59 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
 
         entity.IsArchived = false;
         entity.ArchivedAt = null;
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
     [HttpGet("classrooms")]
-    public async Task<ActionResult<object>> GetClassrooms(CancellationToken cancellationToken) =>
-        Ok(await db.Classrooms.AsNoTracking()
-            .OrderBy(x => x.Building!.Campus!.SortOrder)
-            .ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id, x.Code, x.Name, x.BuildingId,
-                CampusId = x.Building!.CampusId,
-                BuildingName = x.Building!.Name,
-                CampusName = x.Building.Campus!.Name,
-                x.Capacity, x.RoomType, x.Equipment, x.IsEnabled, x.SortOrder
-            })
-            .ToListAsync(cancellationToken));
+    public async Task<ActionResult<object>> GetClassrooms(CancellationToken cancellationToken)
+    {
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("classrooms"),
+            token => db.Classrooms.AsNoTracking()
+                .OrderBy(x => x.Building!.Campus!.SortOrder)
+                .ThenBy(x => x.Code)
+                .Select(x => new ClassroomListItem(
+                    x.Id,
+                    x.Code,
+                    x.Name,
+                    x.BuildingId,
+                    x.Building!.CampusId,
+                    x.Building.Name,
+                    x.Building.Campus!.Name,
+                    x.Capacity,
+                    x.RoomType,
+                    x.Equipment,
+                    x.IsEnabled,
+                    x.SortOrder))
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
+    }
 
     [HttpGet("buildings")]
-    public async Task<ActionResult<object>> GetBuildings(CancellationToken cancellationToken) =>
-        Ok(await db.Buildings.AsNoTracking()
-            .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id, x.Code, x.Name, x.CampusId,
-                CampusName = x.Campus!.Name, x.IsEnabled, x.SortOrder
-            })
-            .ToListAsync(cancellationToken));
+    public async Task<ActionResult<object>> GetBuildings(CancellationToken cancellationToken)
+    {
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.BaseData("buildings"),
+            token => db.Buildings.AsNoTracking()
+                .OrderBy(x => x.SortOrder).ThenBy(x => x.Code)
+                .Select(x => new BuildingListItem(
+                    x.Id,
+                    x.Code,
+                    x.Name,
+                    x.CampusId,
+                    x.Campus!.Name,
+                    x.IsEnabled,
+                    x.SortOrder))
+                .ToListAsync(token),
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            cancellationToken);
+        return Ok(result);
+    }
 
     [HttpPost("buildings")]
     [Authorize(Roles = Administrators)]
@@ -503,7 +578,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         entity.Capacity = request.Capacity;
         entity.RoomType = request.RoomType.Trim();
         entity.Equipment = request.Equipment?.Trim();
-        await db.SaveChangesAsync(cancellationToken);
+        await SaveAndInvalidateAsync(cancellationToken);
         return entity;
     }
 
@@ -533,7 +608,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         db.Remove(entity);
         try
         {
-            await db.SaveChangesAsync(cancellationToken);
+            await SaveAndInvalidateAsync(cancellationToken);
             return NoContent();
         }
         catch (DbUpdateException)
@@ -556,7 +631,7 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         db.Add(entity);
         try
         {
-            await db.SaveChangesAsync(cancellationToken);
+            await SaveAndInvalidateAsync(cancellationToken);
         }
         catch (DbUpdateException)
         {
@@ -566,6 +641,12 @@ public sealed class BaseDataController(AppDbContext db) : ControllerBase
         return CreatedAtAction(action, new { id = entity.Id }, entity);
     }
 
+    private async Task SaveAndInvalidateAsync(CancellationToken cancellationToken)
+    {
+        await db.SaveChangesAsync(cancellationToken);
+        await cache.RemoveByTagAsync(AppCacheTags.BaseData, cancellationToken);
+    }
+
     private async Task<string?> GetCounselorNameAsync(
         Guid? userId,
         CancellationToken cancellationToken)
@@ -649,3 +730,60 @@ public sealed record ClassroomRequest(
     [Required, MaxLength(40)] string RoomType,
     [MaxLength(300)] string? Equipment)
     : CatalogRequest(Code, Name, SortOrder, IsEnabled);
+
+public sealed record CollegeListItem(
+    Guid Id,
+    string Code,
+    string Name,
+    string? ShortName,
+    Guid? CampusId,
+    string? CampusName,
+    bool IsEnabled,
+    int SortOrder);
+
+public sealed record MajorListItem(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid CollegeId,
+    string CollegeName,
+    string DegreeType,
+    int SchoolingYears,
+    bool IsEnabled,
+    int SortOrder);
+
+public sealed record AdministrativeClassListItem(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid MajorId,
+    string MajorName,
+    string CollegeName,
+    int Grade,
+    Guid? CounselorUserId,
+    string? CounselorName,
+    bool IsEnabled,
+    int SortOrder);
+
+public sealed record BuildingListItem(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid CampusId,
+    string CampusName,
+    bool IsEnabled,
+    int SortOrder);
+
+public sealed record ClassroomListItem(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid BuildingId,
+    Guid CampusId,
+    string BuildingName,
+    string CampusName,
+    int Capacity,
+    string RoomType,
+    string? Equipment,
+    bool IsEnabled,
+    int SortOrder);

src/Jiaowu.Api/Controllers/BaseDataExcelController.cs

@@ -1,6 +1,7 @@
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Common;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -12,7 +13,7 @@ namespace Jiaowu.Api.Controllers;
 [ApiController]
 [Authorize(Roles = Administrators)]
 [Route("api/base-data")]
-public sealed class BaseDataExcelController(AppDbContext db) : ControllerBase
+public sealed class BaseDataExcelController(AppDbContext db, IAppCache cache) : ControllerBase
 {
     private const string Administrators =
         $"{SystemRoles.SuperAdmin},{SystemRoles.AcademicAdmin}";
@@ -114,6 +115,9 @@ public sealed class BaseDataExcelController(AppDbContext db) : ControllerBase
 
                     await db.SaveChangesAsync(cancellationToken);
                     await transaction.CommitAsync(cancellationToken);
+                    await cache.RemoveByTagAsync(
+                        AppCacheTags.BaseData,
+                        cancellationToken);
                     return Ok(result);
                 }
                 catch (DbUpdateException)

src/Jiaowu.Api/Controllers/CoursesController.cs

@@ -3,6 +3,7 @@ using Jiaowu.Api.Contracts;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -15,7 +16,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/courses")]
 public sealed class CoursesController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache cache) : ControllerBase
 {
     private const string WriteRoles =
         SystemRoles.SuperAdmin + "," +
@@ -273,6 +275,7 @@ public sealed class CoursesController(
         try
         {
             await db.SaveChangesAsync(cancellationToken);
+            await cache.RemoveByTagAsync(AppCacheTags.Timetables, cancellationToken);
             return created ? Created(string.Empty, new { id }) : NoContent();
         }
         catch (DbUpdateException)

src/Jiaowu.Api/Controllers/CoursesExcelController.cs

@@ -2,6 +2,7 @@ using System.Globalization;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -15,7 +16,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/courses")]
 public sealed class CoursesExcelController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache cache) : ControllerBase
 {
     private const string WriteRoles =
         SystemRoles.SuperAdmin + "," +
@@ -141,6 +143,9 @@ public sealed class CoursesExcelController(
 
                     await db.SaveChangesAsync(cancellationToken);
                     await transaction.CommitAsync(cancellationToken);
+                    await cache.RemoveByTagAsync(
+                        AppCacheTags.Timetables,
+                        cancellationToken);
                     return Ok(result);
                 }
                 catch (DbUpdateException)

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);
     }
 }

src/Jiaowu.Api/Controllers/ExamsController.cs

@@ -2,6 +2,7 @@ using System.ComponentModel.DataAnnotations;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Exams;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -16,7 +17,8 @@ namespace Jiaowu.Api.Controllers;
 public sealed class ExamsController(
     AppDbContext db,
     ICurrentUserDataScope currentUserDataScope,
-    ExamArrangementService examArrangementService) : ControllerBase
+    ExamArrangementService examArrangementService,
+    IAppCache cache) : ControllerBase
 {
     private const string Managers =
         SystemRoles.SuperAdmin + "," + SystemRoles.AcademicAdmin;
@@ -610,6 +612,7 @@ public sealed class ExamsController(
         try
         {
             await db.SaveChangesAsync(token);
+            await cache.RemoveByTagAsync(AppCacheTags.Timetables, token);
             return created ? Created(string.Empty, new { id }) : NoContent();
         }
         catch (DbUpdateException)

src/Jiaowu.Api/Controllers/PersonnelController.cs

@@ -3,6 +3,7 @@ using Jiaowu.Api.Contracts;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
@@ -17,7 +18,8 @@ namespace Jiaowu.Api.Controllers;
 public sealed class PersonnelController(
     AppDbContext db,
     ICurrentUserDataScope currentUserDataScope,
-    UserManager<ApplicationUser> userManager) : ControllerBase
+    UserManager<ApplicationUser> userManager,
+    IAppCache cache) : ControllerBase
 {
     private const string ReadRoles =
         SystemRoles.SuperAdmin + "," +
@@ -209,6 +211,9 @@ public sealed class PersonnelController(
                 teacher.UserId = user.Id;
                 await db.SaveChangesAsync(cancellationToken);
                 await transaction.CommitAsync(cancellationToken);
+                await cache.RemoveByTagAsync(
+                    AppCacheTags.Timetables,
+                    cancellationToken);
                 return Ok(new { user.Id, UserName = userName });
             },
             cancellationToken);
@@ -429,6 +434,9 @@ public sealed class PersonnelController(
         try
         {
             await db.SaveChangesAsync(cancellationToken);
+            await cache.RemoveByTagAsync(
+                AppCacheTags.Timetables,
+                cancellationToken);
             return Created(string.Empty, new { id });
         }
         catch (DbUpdateException)
@@ -442,6 +450,9 @@ public sealed class PersonnelController(
         try
         {
             await db.SaveChangesAsync(cancellationToken);
+            await cache.RemoveByTagAsync(
+                AppCacheTags.Timetables,
+                cancellationToken);
             return NoContent();
         }
         catch (DbUpdateException)

src/Jiaowu.Api/Controllers/PersonnelExcelController.cs

@@ -1,6 +1,7 @@
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -14,7 +15,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/personnel")]
 public sealed class PersonnelExcelController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache cache) : ControllerBase
 {
     private const string ReadRoles =
         SystemRoles.SuperAdmin + "," +
@@ -142,6 +144,9 @@ public sealed class PersonnelExcelController(
                     }
                     await db.SaveChangesAsync(cancellationToken);
                     await transaction.CommitAsync(cancellationToken);
+                    await cache.RemoveByTagAsync(
+                        AppCacheTags.Timetables,
+                        cancellationToken);
                     return Ok(result);
                 }
                 catch (DbUpdateException)

src/Jiaowu.Api/Controllers/ScheduleSettingsController.cs

@@ -1,6 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -11,7 +12,7 @@ namespace Jiaowu.Api.Controllers;
 [ApiController]
 [Authorize(Roles = SystemRoles.SuperAdmin + "," + SystemRoles.AcademicAdmin)]
 [Route("api/schedules")]
-public sealed class ScheduleSettingsController(AppDbContext db) : ControllerBase
+public sealed class ScheduleSettingsController(AppDbContext db, IAppCache cache) : ControllerBase
 {
     [HttpGet("time-slots")]
     public async Task<ActionResult> GetTimeSlots(
@@ -65,6 +66,7 @@ public sealed class ScheduleSettingsController(AppDbContext db) : ControllerBase
             IsEnabled = request.IsEnabled
         }));
         await db.SaveChangesAsync(cancellationToken);
+        await cache.RemoveByTagAsync(AppCacheTags.Timetables, cancellationToken);
         return NoContent();
     }
 

src/Jiaowu.Api/Controllers/StatisticsController.cs

@@ -1,6 +1,8 @@
+using System.Text.Json;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Authorization;
@@ -14,7 +16,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/statistics")]
 public sealed class StatisticsController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache appCache) : ControllerBase
 {
     private const string ViewerRoles =
         SystemRoles.SuperAdmin + "," +
@@ -34,14 +37,49 @@ public sealed class StatisticsController(
     // ── 1. Student Statistics ────────────────────────────────────────
 
     [HttpGet("students/summary")]
-    public async Task<ActionResult<object>> GetStudentSummary(
+    public Task<ActionResult<object>> GetStudentSummary(
         Guid? collegeId, Guid? majorId, Guid? classId,
         int? grade, int? enrollmentYear,
+        CancellationToken cancellationToken) =>
+        GetStudentSummaryCore(
+            collegeId,
+            majorId,
+            classId,
+            grade,
+            enrollmentYear,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetStudentSummaryCore(
+        Guid? collegeId, Guid? majorId, Guid? classId,
+        int? grade, int? enrollmentYear,
+        bool useCache,
         CancellationToken cancellationToken)
     {
         var effectiveCollegeId = ResolveCollegeId(collegeId);
         if (collegeId.HasValue && effectiveCollegeId != collegeId) return Forbid();
 
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "students",
+                    effectiveCollegeId,
+                    KeyPart(majorId),
+                    KeyPart(classId),
+                    KeyPart(grade),
+                    KeyPart(enrollmentYear)),
+                token => GetStudentSummaryCore(
+                    collegeId,
+                    majorId,
+                    classId,
+                    grade,
+                    enrollmentYear,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         var baseQuery = db.Students.AsNoTracking()
             .Where(s => effectiveCollegeId == null ||
                 s.AdministrativeClass!.Major!.CollegeId == effectiveCollegeId)
@@ -112,8 +150,16 @@ public sealed class StatisticsController(
         int? grade, int? enrollmentYear,
         CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetStudentSummary(collegeId, majorId, classId, grade, enrollmentYear, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetStudentSummaryCore(
+            collegeId,
+            majorId,
+            classId,
+            grade,
+            enrollmentYear,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("学生统计", new()
         {
             { "各学院人数", ((IEnumerable<dynamic>)data.byCollege).Select(x => new object?[] { x.collegeName, x.count }) },
@@ -128,13 +174,41 @@ public sealed class StatisticsController(
     // ── 2. Course Statistics ─────────────────────────────────────────
 
     [HttpGet("courses/summary")]
-    public async Task<ActionResult<object>> GetCourseSummary(
+    public Task<ActionResult<object>> GetCourseSummary(
         Guid? collegeId, Guid? categoryId, CourseNature? nature,
+        CancellationToken cancellationToken) =>
+        GetCourseSummaryCore(
+            collegeId,
+            categoryId,
+            nature,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetCourseSummaryCore(
+        Guid? collegeId, Guid? categoryId, CourseNature? nature,
+        bool useCache,
         CancellationToken cancellationToken)
     {
         var effectiveCollegeId = ResolveCollegeId(collegeId);
         if (collegeId.HasValue && effectiveCollegeId != collegeId) return Forbid();
 
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "courses",
+                    effectiveCollegeId,
+                    KeyPart(categoryId),
+                    KeyPart(nature)),
+                token => GetCourseSummaryCore(
+                    collegeId,
+                    categoryId,
+                    nature,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         var baseQuery = db.Courses.AsNoTracking()
             .Where(c => effectiveCollegeId == null || c.CollegeId == effectiveCollegeId)
             .Where(c => categoryId == null || c.CourseCategoryId == categoryId)
@@ -184,8 +258,14 @@ public sealed class StatisticsController(
         Guid? collegeId, Guid? categoryId, CourseNature? nature,
         CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetCourseSummary(collegeId, categoryId, nature, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetCourseSummaryCore(
+            collegeId,
+            categoryId,
+            nature,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("课程统计", new()
         {
             { "各学院课程数", ((IEnumerable<dynamic>)data.byCollege).Select(x => new object?[] { x.collegeName, x.count }) },
@@ -199,13 +279,46 @@ public sealed class StatisticsController(
     // ── 3. Grade Statistics ──────────────────────────────────────────
 
     [HttpGet("grades/summary")]
-    public async Task<ActionResult<object>> GetGradeSummary(
+    public Task<ActionResult<object>> GetGradeSummary(
         Guid? academicTermId, Guid? collegeId, Guid? majorId, Guid? classId,
-        Guid? courseId, CancellationToken cancellationToken)
+        Guid? courseId, CancellationToken cancellationToken) =>
+        GetGradeSummaryCore(
+            academicTermId,
+            collegeId,
+            majorId,
+            classId,
+            courseId,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetGradeSummaryCore(
+        Guid? academicTermId, Guid? collegeId, Guid? majorId, Guid? classId,
+        Guid? courseId, bool useCache, CancellationToken cancellationToken)
     {
         var effectiveCollegeId = ResolveCollegeId(collegeId);
         if (collegeId.HasValue && effectiveCollegeId != collegeId) return Forbid();
 
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "grades",
+                    effectiveCollegeId,
+                    KeyPart(academicTermId),
+                    KeyPart(majorId),
+                    KeyPart(classId),
+                    KeyPart(courseId)),
+                token => GetGradeSummaryCore(
+                    academicTermId,
+                    collegeId,
+                    majorId,
+                    classId,
+                    courseId,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         var recordsQuery = db.GradeRecords.AsNoTracking()
             .Where(r => r.GradeSheet!.Status == GradeSheetStatus.Published)
             .Where(r => academicTermId == null || r.GradeSheet!.TeachingTask!.AcademicTermId == academicTermId)
@@ -302,8 +415,16 @@ public sealed class StatisticsController(
         Guid? academicTermId, Guid? collegeId, Guid? majorId, Guid? classId,
         Guid? courseId, CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetGradeSummary(academicTermId, collegeId, majorId, classId, courseId, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetGradeSummaryCore(
+            academicTermId,
+            collegeId,
+            majorId,
+            classId,
+            courseId,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("成绩统计", new()
         {
             { "分数段分布", ((IEnumerable<dynamic>)data.scoreDistribution).Select(x => new object?[] { x.label, x.count }) },
@@ -317,13 +438,41 @@ public sealed class StatisticsController(
     // ── 4. Pass Rate Statistics ──────────────────────────────────────
 
     [HttpGet("pass-rates/summary")]
-    public async Task<ActionResult<object>> GetPassRateSummary(
+    public Task<ActionResult<object>> GetPassRateSummary(
         Guid? academicTermId, Guid? collegeId, Guid? courseId,
+        CancellationToken cancellationToken) =>
+        GetPassRateSummaryCore(
+            academicTermId,
+            collegeId,
+            courseId,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetPassRateSummaryCore(
+        Guid? academicTermId, Guid? collegeId, Guid? courseId,
+        bool useCache,
         CancellationToken cancellationToken)
     {
         var effectiveCollegeId = ResolveCollegeId(collegeId);
         if (collegeId.HasValue && effectiveCollegeId != collegeId) return Forbid();
 
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "pass-rates",
+                    effectiveCollegeId,
+                    KeyPart(academicTermId),
+                    KeyPart(courseId)),
+                token => GetPassRateSummaryCore(
+                    academicTermId,
+                    collegeId,
+                    courseId,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         var recordsQuery = db.GradeRecords.AsNoTracking()
             .Where(r => r.GradeSheet!.Status == GradeSheetStatus.Published)
             .Where(r => academicTermId == null || r.GradeSheet!.TeachingTask!.AcademicTermId == academicTermId)
@@ -425,8 +574,14 @@ public sealed class StatisticsController(
         Guid? academicTermId, Guid? collegeId, Guid? courseId,
         CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetPassRateSummary(academicTermId, collegeId, courseId, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetPassRateSummaryCore(
+            academicTermId,
+            collegeId,
+            courseId,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("通过率统计", new()
         {
             { "各学院通过率", ((IEnumerable<dynamic>)data.byCollege).Select(x => new object?[] { x.collegeName, x.passRate, x.total }) },
@@ -439,13 +594,38 @@ public sealed class StatisticsController(
     // ── 5. Teacher Workload Statistics ───────────────────────────────
 
     [HttpGet("teacher-workload/summary")]
-    public async Task<ActionResult<object>> GetTeacherWorkloadSummary(
+    public Task<ActionResult<object>> GetTeacherWorkloadSummary(
         Guid? academicTermId, Guid? collegeId,
+        CancellationToken cancellationToken) =>
+        GetTeacherWorkloadSummaryCore(
+            academicTermId,
+            collegeId,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetTeacherWorkloadSummaryCore(
+        Guid? academicTermId, Guid? collegeId,
+        bool useCache,
         CancellationToken cancellationToken)
     {
         var effectiveCollegeId = ResolveCollegeId(collegeId);
         if (collegeId.HasValue && effectiveCollegeId != collegeId) return Forbid();
 
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "teacher-workload",
+                    effectiveCollegeId,
+                    KeyPart(academicTermId)),
+                token => GetTeacherWorkloadSummaryCore(
+                    academicTermId,
+                    collegeId,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         var tasks = await db.TeachingTaskTeachers.AsNoTracking()
             .Where(tt => academicTermId == null || tt.TeachingTask!.AcademicTermId == academicTermId)
             .Where(tt => effectiveCollegeId == null || tt.Teacher!.CollegeId == effectiveCollegeId)
@@ -524,8 +704,13 @@ public sealed class StatisticsController(
         Guid? academicTermId, Guid? collegeId,
         CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetTeacherWorkloadSummary(academicTermId, collegeId, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetTeacherWorkloadSummaryCore(
+            academicTermId,
+            collegeId,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("教师工作量统计", new()
         {
             { "教师明细", ((IEnumerable<dynamic>)data.byTeacher).Select(x => new object?[] { x.teacherName, x.teacherNumber, x.collegeName, x.title, x.totalHours, x.courseCount, x.taskCount }) },
@@ -537,10 +722,39 @@ public sealed class StatisticsController(
     // ── 6. Classroom Utilization Statistics ──────────────────────────
 
     [HttpGet("classroom-utilization/summary")]
-    public async Task<ActionResult<object>> GetClassroomUtilizationSummary(
+    public Task<ActionResult<object>> GetClassroomUtilizationSummary(
         Guid? academicTermId, Guid? buildingId, Guid? campusId,
+        CancellationToken cancellationToken) =>
+        GetClassroomUtilizationSummaryCore(
+            academicTermId,
+            buildingId,
+            campusId,
+            useCache: true,
+            cancellationToken);
+
+    private async Task<ActionResult<object>> GetClassroomUtilizationSummaryCore(
+        Guid? academicTermId, Guid? buildingId, Guid? campusId,
+        bool useCache,
         CancellationToken cancellationToken)
     {
+        if (useCache)
+        {
+            return await GetCachedSummaryAsync(
+                StatisticsKey(
+                    "classroom-utilization",
+                    RestrictedCollegeId,
+                    KeyPart(academicTermId),
+                    KeyPart(buildingId),
+                    KeyPart(campusId)),
+                token => GetClassroomUtilizationSummaryCore(
+                    academicTermId,
+                    buildingId,
+                    campusId,
+                    useCache: false,
+                    token),
+                cancellationToken);
+        }
+
         // Find published schedule plan
         var planQuery = db.SchedulePlans.AsNoTracking()
             .Where(p => p.Status == SchedulePlanStatus.Published);
@@ -713,8 +927,14 @@ public sealed class StatisticsController(
         Guid? academicTermId, Guid? buildingId, Guid? campusId,
         CancellationToken cancellationToken)
     {
-        var data = (dynamic)(await GetClassroomUtilizationSummary(academicTermId, buildingId, campusId, cancellationToken)
-            .ConfigureAwait(false)).Value!;
+        var summary = await GetClassroomUtilizationSummaryCore(
+            academicTermId,
+            buildingId,
+            campusId,
+            useCache: false,
+            cancellationToken);
+        if (summary.Result is not null) return summary.Result;
+        var data = (dynamic)summary.Value!;
         return ExportSummary("教室利用率统计", new()
         {
             { "各教学楼", ((IEnumerable<dynamic>)data.byBuilding).Select(x => new object?[] { x.buildingName, x.totalClassrooms, x.utilizationRate, x.totalUsedPeriods, x.totalAvailablePeriods }) },
@@ -727,6 +947,50 @@ public sealed class StatisticsController(
 
     // ── Helpers ──────────────────────────────────────────────────────
 
+    private async Task<ActionResult<object>> GetCachedSummaryAsync(
+        string key,
+        Func<CancellationToken, Task<ActionResult<object>>> factory,
+        CancellationToken cancellationToken)
+    {
+        var value = await appCache.GetOrCreateAsync(
+            key,
+            async token =>
+            {
+                var source = await factory(token);
+                if (source.Result is not null || source.Value is null)
+                    throw new InvalidOperationException(
+                        "Statistics cache source did not return a successful value.");
+
+                return JsonSerializer.SerializeToElement(
+                    source.Value,
+                    source.Value.GetType());
+            },
+            AppCacheProfile.Analytics,
+            [AppCacheTags.Analytics],
+            cancellationToken);
+        return value;
+    }
+
+    private string StatisticsKey(
+        string area,
+        Guid? effectiveCollegeId,
+        params string?[] filters) =>
+        AppCacheKeys.Statistics(
+            area,
+            currentUserDataScope.Current.Scope.ToString(),
+            effectiveCollegeId,
+            filters);
+
+    private static string KeyPart(Guid? value) =>
+        value?.ToString("N") ?? "-";
+
+    private static string KeyPart(int? value) =>
+        value?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-";
+
+    private static string KeyPart<TEnum>(TEnum? value)
+        where TEnum : struct, Enum =>
+        value?.ToString() ?? "-";
+
     private FileContentResult ExportSummary(
         string title,
         Dictionary<string, IEnumerable<object?[]>> sheets)

src/Jiaowu.Api/Controllers/TeachingTasksController.cs

@@ -4,6 +4,7 @@ using Jiaowu.Api.Contracts;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Jiaowu.Api.Infrastructure.Teaching;
 using Microsoft.AspNetCore.Authorization;
@@ -17,7 +18,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/teaching-tasks")]
 public sealed class TeachingTasksController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache cache) : ControllerBase
 {
     private const string ManagementRoles =
         SystemRoles.SuperAdmin + "," +
@@ -389,6 +391,7 @@ public sealed class TeachingTasksController(
         try
         {
             await db.SaveChangesAsync(cancellationToken);
+            await cache.RemoveByTagAsync(AppCacheTags.Timetables, cancellationToken);
             return Ok(new { AffectedCount = tasks.Count });
         }
         catch (DbUpdateException)
@@ -544,6 +547,9 @@ public sealed class TeachingTasksController(
                 db.TeachingTasks.AddRange(created);
                 await db.SaveChangesAsync(cancellationToken);
                 await transaction.CommitAsync(cancellationToken);
+                await cache.RemoveByTagAsync(
+                    AppCacheTags.Timetables,
+                    cancellationToken);
                 return Ok(new
                 {
                     BatchCode = batchCode,
@@ -737,6 +743,7 @@ public sealed class TeachingTasksController(
         try
         {
             await db.SaveChangesAsync(cancellationToken);
+            await cache.RemoveByTagAsync(AppCacheTags.Timetables, cancellationToken);
             return created ? Created(string.Empty, new { id }) : NoContent();
         }
         catch (DbUpdateException)

src/Jiaowu.Api/Controllers/TimetablesController.cs

@@ -1,6 +1,7 @@
 using System.Security.Claims;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Jiaowu.Api.Infrastructure.Timetables;
@@ -14,74 +15,24 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/timetables")]
 public sealed class TimetablesController(
     AppDbContext db,
-    TimetableDataService timetableDataService) : ControllerBase
+    TimetableDataService timetableDataService,
+    IAppCache cache) : ControllerBase
 {
     [HttpGet("options")]
     [AllowAnonymous]
     public async Task<ActionResult> GetOptions(CancellationToken cancellationToken)
     {
-        var terms = await db.AcademicTerms.AsNoTracking()
-            .Where(x => x.IsEnabled)
-            .OrderByDescending(x => x.StartDate)
-            .Select(x => new
-            {
-                x.Id,
-                x.Name,
-                x.AcademicYear,
-                x.Season,
-                x.StartDate,
-                x.EndDate,
-                x.IsCurrent,
-                x.IsArchived,
-                 HasPublishedTimetable = db.SchedulePlans.Any(plan =>
-                     plan.AcademicTermId == x.Id &&
-                     plan.Status == SchedulePlanStatus.Published) ||
-                     db.TeachingTasks.Any(task =>
-                         task.AcademicTermId == x.Id &&
-                         task.Status == TeachingTaskStatus.Published &&
-                         task.SchedulingMode == TeachingTaskSchedulingMode.Flexible)
-            })
-            .ToListAsync(cancellationToken);
-        var defaultTermId = terms.FirstOrDefault(x => x.IsCurrent)?.Id
-            ?? terms.FirstOrDefault(x => x.HasPublishedTimetable)?.Id;
-        var classes = await db.AdministrativeClasses.AsNoTracking()
-            .Where(x => x.IsEnabled && x.Major!.IsEnabled && x.Major.College!.IsEnabled)
-            .OrderByDescending(x => x.Grade)
-            .ThenBy(x => x.Code)
-            .Select(x => new
-            {
-                x.Id,
-                x.Code,
-                 x.Name,
-                 x.Grade,
-                 x.MajorId,
-                 MajorName = x.Major!.Name,
-                 CollegeId = x.Major.CollegeId,
-                 CollegeName = x.Major.College!.Name,
-                 HasPublishedTimetable = defaultTermId.HasValue &&
-                     (db.ScheduleEntries.Any(entry =>
-                          entry.SchedulePlan!.AcademicTermId == defaultTermId.Value &&
-                          entry.SchedulePlan.Status == SchedulePlanStatus.Published &&
-                          entry.TeachingTask!.Classes.Any(item =>
-                              item.AdministrativeClassId == x.Id)) ||
-                      db.TeachingTasks.Any(task =>
-                          task.AcademicTermId == defaultTermId.Value &&
-                          task.Status == TeachingTaskStatus.Published &&
-                          task.SchedulingMode == TeachingTaskSchedulingMode.Flexible &&
-                          task.Classes.Any(item => item.AdministrativeClassId == x.Id)))
-             })
-             .ToListAsync(cancellationToken);
-        var colleges = await db.Colleges.AsNoTracking()
-            .Where(x => x.IsEnabled)
-            .OrderBy(x => x.Code)
-            .Select(x => new { x.Id, x.Code, x.Name })
-            .ToListAsync(cancellationToken);
-        var majors = await db.Majors.AsNoTracking()
-            .Where(x => x.IsEnabled && x.College!.IsEnabled)
-            .OrderBy(x => x.Code)
-            .Select(x => new { x.Id, x.Code, x.Name, x.CollegeId })
-            .ToListAsync(cancellationToken);
-        return Ok(new { Terms = terms, Colleges = colleges, Majors = majors, Classes = classes });
+        var result = await cache.GetOrCreateAsync(
+            AppCacheKeys.TimetableOptions,
+            LoadOptionsAsync,
+            AppCacheProfile.ReferenceData,
+            [
+                AppCacheTags.BaseData,
+                AppCacheTags.Timetables,
+                AppCacheTags.TimetableOptions
+            ],
+            cancellationToken);
+        return Ok(result);
     }
 
     [HttpGet("classes/{classId:guid}")]
@@ -99,14 +50,10 @@ public sealed class TimetablesController(
         Guid? academicTermId,
         CancellationToken cancellationToken)
     {
-        var result = await timetableDataService.BuildAsync(
+        var result = await GetPublishedTimetableAsync(
             TimetableResourceType.Teacher,
             teacherId,
             academicTermId,
-            null,
-            false,
-            null,
-            null,
             cancellationToken);
         return result is null ? NotFound() : Ok(result);
     }
@@ -118,14 +65,10 @@ public sealed class TimetablesController(
         Guid? academicTermId,
         CancellationToken cancellationToken)
     {
-        var result = await timetableDataService.BuildAsync(
+        var result = await GetPublishedTimetableAsync(
             TimetableResourceType.Teacher,
             teacherId,
             academicTermId,
-            null,
-            false,
-            null,
-            null,
             cancellationToken);
         if (result is null) return NotFound();
         return ExcelFile(result);
@@ -138,14 +81,10 @@ public sealed class TimetablesController(
         Guid? academicTermId,
         CancellationToken cancellationToken)
     {
-        var result = await timetableDataService.BuildAsync(
+        var result = await GetPublishedTimetableAsync(
             TimetableResourceType.Class,
             classId,
             academicTermId,
-            null,
-            false,
-            null,
-            null,
             cancellationToken);
         if (result is null) return NotFound();
         return ExcelFile(result);
@@ -269,18 +208,111 @@ public sealed class TimetablesController(
         CancellationToken cancellationToken,
         TimetableStudentDto? student = null)
     {
-        var result = await timetableDataService.BuildAsync(
-            TimetableResourceType.Class,
-            classId,
-            academicTermId,
-            null,
-            false,
-            studentId,
-            student,
-            cancellationToken);
+        var result = studentId.HasValue || student is not null
+            ? await timetableDataService.BuildAsync(
+                TimetableResourceType.Class,
+                classId,
+                academicTermId,
+                null,
+                false,
+                studentId,
+                student,
+                cancellationToken)
+            : await GetPublishedTimetableAsync(
+                TimetableResourceType.Class,
+                classId,
+                academicTermId,
+                cancellationToken);
          return result is null ? NotFound() : Ok(result);
      }
 
+    private Task<TimetableData?> GetPublishedTimetableAsync(
+        TimetableResourceType resourceType,
+        Guid resourceId,
+        Guid? academicTermId,
+        CancellationToken cancellationToken) =>
+        cache.GetOrCreateAsync(
+            AppCacheKeys.PublishedTimetable(
+                resourceType.ToString().ToLowerInvariant(),
+                resourceId,
+                academicTermId),
+            token => timetableDataService.BuildAsync(
+                resourceType,
+                resourceId,
+                academicTermId,
+                null,
+                false,
+                null,
+                null,
+                token),
+            AppCacheProfile.PublishedTimetable,
+            [AppCacheTags.BaseData, AppCacheTags.Timetables],
+            cancellationToken);
+
+    private async Task<TimetableOptionsResponse> LoadOptionsAsync(
+        CancellationToken cancellationToken)
+    {
+        var terms = await db.AcademicTerms.AsNoTracking()
+            .Where(x => x.IsEnabled)
+            .OrderByDescending(x => x.StartDate)
+            .Select(x => new TimetableTermOption(
+                x.Id,
+                x.Name,
+                x.AcademicYear,
+                x.Season,
+                x.StartDate,
+                x.EndDate,
+                x.IsCurrent,
+                x.IsArchived,
+                db.SchedulePlans.Any(plan =>
+                    plan.AcademicTermId == x.Id &&
+                    plan.Status == SchedulePlanStatus.Published) ||
+                db.TeachingTasks.Any(task =>
+                    task.AcademicTermId == x.Id &&
+                    task.Status == TeachingTaskStatus.Published &&
+                    task.SchedulingMode == TeachingTaskSchedulingMode.Flexible)))
+            .ToListAsync(cancellationToken);
+        var defaultTermId = terms.FirstOrDefault(x => x.IsCurrent)?.Id
+            ?? terms.FirstOrDefault(x => x.HasPublishedTimetable)?.Id;
+        var classes = await db.AdministrativeClasses.AsNoTracking()
+            .Where(x => x.IsEnabled && x.Major!.IsEnabled && x.Major.College!.IsEnabled)
+            .OrderByDescending(x => x.Grade)
+            .ThenBy(x => x.Code)
+            .Select(x => new TimetableClassOption(
+                x.Id,
+                x.Code,
+                x.Name,
+                x.Grade,
+                x.MajorId,
+                x.Major!.Name,
+                x.Major.CollegeId,
+                x.Major.College!.Name,
+                defaultTermId.HasValue &&
+                (db.ScheduleEntries.Any(entry =>
+                     entry.SchedulePlan!.AcademicTermId == defaultTermId.Value &&
+                     entry.SchedulePlan.Status == SchedulePlanStatus.Published &&
+                     entry.TeachingTask!.Classes.Any(item =>
+                         item.AdministrativeClassId == x.Id)) ||
+                 db.TeachingTasks.Any(task =>
+                     task.AcademicTermId == defaultTermId.Value &&
+                     task.Status == TeachingTaskStatus.Published &&
+                     task.SchedulingMode == TeachingTaskSchedulingMode.Flexible &&
+                     task.Classes.Any(item => item.AdministrativeClassId == x.Id)))))
+            .ToListAsync(cancellationToken);
+        var colleges = await db.Colleges.AsNoTracking()
+            .Where(x => x.IsEnabled)
+            .OrderBy(x => x.Code)
+            .Select(x => new TimetableCollegeOption(x.Id, x.Code, x.Name))
+            .ToListAsync(cancellationToken);
+        var majors = await db.Majors.AsNoTracking()
+            .Where(x => x.IsEnabled && x.College!.IsEnabled)
+            .OrderBy(x => x.Code)
+            .Select(x => new TimetableMajorOption(
+                x.Id, x.Code, x.Name, x.CollegeId))
+            .ToListAsync(cancellationToken);
+        return new TimetableOptionsResponse(terms, colleges, majors, classes);
+    }
+
     private ActionResult ExcelFile(TimetableData result)
     {
         var bytes = TimetableExcelExporter.Create(result);
@@ -296,3 +328,39 @@ public sealed class TimetablesController(
         return value.Trim();
     }
 }
+
+public sealed record TimetableOptionsResponse(
+    IReadOnlyList<TimetableTermOption> Terms,
+    IReadOnlyList<TimetableCollegeOption> Colleges,
+    IReadOnlyList<TimetableMajorOption> Majors,
+    IReadOnlyList<TimetableClassOption> Classes);
+
+public sealed record TimetableTermOption(
+    Guid Id,
+    string Name,
+    string AcademicYear,
+    TermSeason Season,
+    DateOnly StartDate,
+    DateOnly EndDate,
+    bool IsCurrent,
+    bool IsArchived,
+    bool HasPublishedTimetable);
+
+public sealed record TimetableCollegeOption(Guid Id, string Code, string Name);
+
+public sealed record TimetableMajorOption(
+    Guid Id,
+    string Code,
+    string Name,
+    Guid CollegeId);
+
+public sealed record TimetableClassOption(
+    Guid Id,
+    string Code,
+    string Name,
+    int Grade,
+    Guid MajorId,
+    string MajorName,
+    Guid CollegeId,
+    string CollegeName,
+    bool HasPublishedTimetable);

src/Jiaowu.Api/Infrastructure/Caching/AppCache.cs

@@ -0,0 +1,196 @@
+using Microsoft.Extensions.Caching.Hybrid;
+using StackExchange.Redis;
+
+namespace Jiaowu.Api.Infrastructure.Caching;
+
+public enum AppCacheProfile
+{
+    ReferenceData,
+    PublishedTimetable,
+    Analytics
+}
+
+public interface IAppCache
+{
+    Task<T> GetOrCreateAsync<T>(
+        string key,
+        Func<CancellationToken, Task<T>> factory,
+        AppCacheProfile profile,
+        IReadOnlyCollection<string> tags,
+        CancellationToken cancellationToken);
+
+    ValueTask RemoveByTagAsync(
+        string tag,
+        CancellationToken cancellationToken = default);
+}
+
+public sealed class HybridAppCache(
+    HybridCache cache,
+    AppCacheOptions options,
+    IHostEnvironment environment,
+    ILogger<HybridAppCache> logger) : IAppCache
+{
+    private readonly string prefix = BuildPrefix(options.KeyPrefix, environment.EnvironmentName);
+
+    public async Task<T> GetOrCreateAsync<T>(
+        string key,
+        Func<CancellationToken, Task<T>> factory,
+        AppCacheProfile profile,
+        IReadOnlyCollection<string> tags,
+        CancellationToken cancellationToken)
+    {
+        if (!options.Enabled)
+            return await factory(cancellationToken);
+
+        var sourceCompleted = false;
+        T? sourceValue = default;
+        try
+        {
+            return await cache.GetOrCreateAsync(
+                $"{prefix}:{key}",
+                async token =>
+                {
+                    sourceValue = await factory(token);
+                    sourceCompleted = true;
+                    return sourceValue;
+                },
+                GetEntryOptions(profile),
+                tags.Select(tag => $"{prefix}:tag:{tag}"),
+                cancellationToken);
+        }
+        catch (RedisException exception)
+        {
+            logger.LogWarning(
+                exception,
+                "Redis cache operation failed for {CacheKey}; using the source directly.",
+                key);
+            if (sourceCompleted)
+                return sourceValue!;
+            return await factory(cancellationToken);
+        }
+    }
+
+    public async ValueTask RemoveByTagAsync(
+        string tag,
+        CancellationToken cancellationToken = default)
+    {
+        if (!options.Enabled)
+            return;
+
+        try
+        {
+            await cache.RemoveByTagAsync(
+                $"{prefix}:tag:{tag}",
+                cancellationToken);
+        }
+        catch (RedisException exception)
+        {
+            logger.LogWarning(
+                exception,
+                "Redis cache invalidation failed for tag {CacheTag}; TTL will bound staleness.",
+                tag);
+        }
+    }
+
+    private HybridCacheEntryOptions GetEntryOptions(AppCacheProfile profile) =>
+        profile switch
+        {
+            AppCacheProfile.ReferenceData => new HybridCacheEntryOptions
+            {
+                Expiration = TimeSpan.FromMinutes(options.ReferenceExpirationMinutes),
+                LocalCacheExpiration =
+                    TimeSpan.FromSeconds(options.ReferenceLocalExpirationSeconds)
+            },
+            AppCacheProfile.PublishedTimetable => new HybridCacheEntryOptions
+            {
+                Expiration = TimeSpan.FromMinutes(options.TimetableExpirationMinutes),
+                LocalCacheExpiration =
+                    TimeSpan.FromSeconds(options.TimetableLocalExpirationSeconds)
+            },
+            AppCacheProfile.Analytics => new HybridCacheEntryOptions
+            {
+                Expiration = TimeSpan.FromMinutes(options.AnalyticsExpirationMinutes),
+                LocalCacheExpiration =
+                    TimeSpan.FromSeconds(options.AnalyticsLocalExpirationSeconds)
+            },
+            _ => throw new ArgumentOutOfRangeException(nameof(profile), profile, null)
+        };
+
+    private static string BuildPrefix(string configuredPrefix, string environmentName)
+    {
+        var prefixValue = string.IsNullOrWhiteSpace(configuredPrefix)
+            ? "jiaowu:v1"
+            : configuredPrefix.Trim().Trim(':');
+        var environmentValue = string.Concat(
+            environmentName.Trim().ToLowerInvariant()
+                .Select(character => char.IsLetterOrDigit(character) ? character : '-'));
+        return $"{prefixValue}:{environmentValue}";
+    }
+}
+
+public sealed class NoOpAppCache : IAppCache
+{
+    public static NoOpAppCache Instance { get; } = new();
+
+    private NoOpAppCache()
+    {
+    }
+
+    public Task<T> GetOrCreateAsync<T>(
+        string key,
+        Func<CancellationToken, Task<T>> factory,
+        AppCacheProfile profile,
+        IReadOnlyCollection<string> tags,
+        CancellationToken cancellationToken) =>
+        factory(cancellationToken);
+
+    public ValueTask RemoveByTagAsync(
+        string tag,
+        CancellationToken cancellationToken = default) =>
+        ValueTask.CompletedTask;
+}
+
+public static class AppCacheKeys
+{
+    public const string ActivationOptions = "auth:activation-options";
+    public const string Dashboard = "dashboard:summary";
+    public const string TimetableOptions = "timetable:options";
+
+    public static string BaseData(string kind) => $"base-data:{kind}";
+
+    public static string PublishedTimetable(
+        string resourceType,
+        Guid resourceId,
+        Guid? academicTermId) =>
+        $"timetable:published:{academicTermId?.ToString("N") ?? "current"}:" +
+        $"{resourceType}:{resourceId:N}";
+
+    public static string Statistics(
+        string area,
+        string dataScope,
+        Guid? effectiveCollegeId,
+        params string?[] filters)
+    {
+        static string Normalize(string? value) =>
+            string.IsNullOrWhiteSpace(value)
+                ? "-"
+                : value.Trim().ToLowerInvariant();
+
+        var filterPart = filters.Length == 0
+            ? "all"
+            : string.Join(':', filters.Select(Normalize));
+        return $"statistics:{Normalize(area)}:scope:{Normalize(dataScope)}:" +
+               $"college:{effectiveCollegeId?.ToString("N") ?? "all"}:{filterPart}";
+    }
+}
+
+public static class AppCacheTags
+{
+    public const string BaseData = "base-data";
+    public const string Analytics = "analytics";
+    public const string Timetables = "timetables";
+    public const string TimetableOptions = "timetable:options";
+
+    public static string Timetable(Guid academicTermId) =>
+        $"timetable:term:{academicTermId:N}";
+}

src/Jiaowu.Api/Infrastructure/Caching/AppCacheOptions.cs

@@ -0,0 +1,16 @@
+namespace Jiaowu.Api.Infrastructure.Caching;
+
+public sealed class AppCacheOptions
+{
+    public const string SectionName = "Cache";
+
+    public bool Enabled { get; set; } = true;
+    public string KeyPrefix { get; set; } = "jiaowu:v1";
+    public int ReferenceExpirationMinutes { get; set; } = 30;
+    public int ReferenceLocalExpirationSeconds { get; set; } = 120;
+    public int TimetableExpirationMinutes { get; set; } = 10;
+    public int TimetableLocalExpirationSeconds { get; set; } = 30;
+    public int AnalyticsExpirationMinutes { get; set; } = 3;
+    public int AnalyticsLocalExpirationSeconds { get; set; } = 30;
+    public int MaximumPayloadKilobytes { get; set; } = 2048;
+}

src/Jiaowu.Api/Infrastructure/Scheduling/SchedulePublishJobs.cs

@@ -1,6 +1,7 @@
 using System.Threading.Channels;
 using System.Diagnostics.CodeAnalysis;
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.EntityFrameworkCore;
 
@@ -103,6 +104,7 @@ public sealed class SchedulePublishJobWorker(
 public sealed class SchedulePublishJobProcessor(
     AppDbContext db,
     SchedulePlanPublisher publisher,
+    IAppCache cache,
     ILogger<SchedulePublishJobProcessor> logger)
 {
     public async Task ProcessAsync(Guid jobId, CancellationToken stoppingToken)
@@ -177,6 +179,7 @@ public sealed class SchedulePublishJobProcessor(
                 },
                 stoppingToken);
 
+            await cache.RemoveByTagAsync(AppCacheTags.Timetables, stoppingToken);
             logger.LogInformation(
                 "Schedule publish job {JobId} published plan {SchedulePlanId}.",
                 jobId,

src/Jiaowu.Api/Jiaowu.Api.csproj

@@ -23,6 +23,8 @@
     <PackageReference Include="ClosedXML" Version="0.105.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.10" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.10" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Hybrid" Version="10.1.0" />
+    <PackageReference Include="Microsoft.Extensions.Caching.StackExchangeRedis" Version="10.0.10" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.10">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

src/Jiaowu.Api/Program.cs

@@ -3,6 +3,7 @@ using System.Text.Json.Serialization;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Configuration;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Exams;
 using Jiaowu.Api.Infrastructure.Middleware;
 using Jiaowu.Api.Infrastructure.Persistence;
@@ -12,6 +13,7 @@ using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.RateLimiting;
 using Microsoft.Data.Sqlite;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Caching.Distributed;
 using Microsoft.IdentityModel.Tokens;
 using Microsoft.OpenApi.Models;
 using System.Threading.RateLimiting;
@@ -61,6 +63,9 @@ if (seedDemoData && builder.Environment.IsDevelopment())
 var databaseOptions = builder.Configuration
     .GetSection(DatabaseOptions.SectionName)
     .Get<DatabaseOptions>() ?? new DatabaseOptions();
+var cacheOptions = builder.Configuration
+    .GetSection(AppCacheOptions.SectionName)
+    .Get<AppCacheOptions>() ?? new AppCacheOptions();
 
 if (databaseOptions.Provider.Equals("SQLite", StringComparison.OrdinalIgnoreCase) &&
     !builder.Environment.IsDevelopment())
@@ -82,7 +87,28 @@ if (databaseOptions.CommandTimeoutSeconds is < 5 or > 300)
         "Database:CommandTimeoutSeconds 必须在 5 到 300 秒之间。");
 }
 
+if (cacheOptions.ReferenceExpirationMinutes is < 1 or > 1440 ||
+    cacheOptions.TimetableExpirationMinutes is < 1 or > 1440 ||
+    cacheOptions.AnalyticsExpirationMinutes is < 1 or > 1440 ||
+    cacheOptions.ReferenceLocalExpirationSeconds is < 1 or > 3600 ||
+    cacheOptions.TimetableLocalExpirationSeconds is < 1 or > 3600 ||
+    cacheOptions.AnalyticsLocalExpirationSeconds is < 1 or > 3600 ||
+    cacheOptions.MaximumPayloadKilobytes is < 64 or > 16384 ||
+    cacheOptions.ReferenceLocalExpirationSeconds >
+        cacheOptions.ReferenceExpirationMinutes * 60 ||
+    cacheOptions.TimetableLocalExpirationSeconds >
+        cacheOptions.TimetableExpirationMinutes * 60 ||
+    cacheOptions.AnalyticsLocalExpirationSeconds >
+        cacheOptions.AnalyticsExpirationMinutes * 60 ||
+    string.IsNullOrWhiteSpace(cacheOptions.KeyPrefix) ||
+    cacheOptions.KeyPrefix.Length > 100)
+{
+    throw new InvalidOperationException(
+        "Cache 缓存时间或 MaximumPayloadKilobytes 超出允许范围。");
+}
+
 builder.Services.AddSingleton(databaseOptions);
+builder.Services.AddSingleton(cacheOptions);
 builder.Services.AddDbContextPool<AppDbContext>(options =>
 {
     if (databaseOptions.Provider.Equals("SQLite", StringComparison.OrdinalIgnoreCase))
@@ -125,6 +151,19 @@ builder.Services.AddDbContextPool<AppDbContext>(options =>
     });
 });
 
+var redisConnectionString = builder.Configuration.GetConnectionString("Redis");
+if (cacheOptions.Enabled && !string.IsNullOrWhiteSpace(redisConnectionString))
+{
+    builder.Services.AddStackExchangeRedisCache(options =>
+        options.Configuration = redisConnectionString);
+}
+builder.Services.AddHybridCache(options =>
+{
+    options.MaximumKeyLength = 512;
+    options.MaximumPayloadBytes = cacheOptions.MaximumPayloadKilobytes * 1024;
+});
+builder.Services.AddSingleton<IAppCache, HybridAppCache>();
+
 builder.Services
     .AddIdentityCore<ApplicationUser>(options =>
     {
@@ -320,6 +359,7 @@ app.MapGet("/health/live", () => Results.Ok(new { Status = "healthy" }))
     .AllowAnonymous();
 app.MapGet("/health", CheckDatabaseHealthAsync).AllowAnonymous();
 app.MapGet("/health/ready", CheckDatabaseHealthAsync).AllowAnonymous();
+app.MapGet("/health/cache", CheckCacheHealthAsync).AllowAnonymous();
 app.MapFallback(async context =>
 {
     if (context.Request.Path.StartsWithSegments("/api") ||
@@ -383,4 +423,27 @@ static async Task<IResult> CheckDatabaseHealthAsync(
     }
 }
 
+static async Task<IResult> CheckCacheHealthAsync(
+    IServiceProvider services,
+    CancellationToken cancellationToken)
+{
+    var distributedCache = services.GetService<IDistributedCache>();
+    if (distributedCache is null)
+        return Results.Ok(new { Status = "disabled", Backend = "memory" });
+
+    try
+    {
+        await distributedCache.GetAsync(
+            "jiaowu:health:probe",
+            cancellationToken);
+        return Results.Ok(new { Status = "healthy", Backend = "redis" });
+    }
+    catch
+    {
+        return Results.Json(
+            new { Status = "unhealthy", Backend = "redis" },
+            statusCode: StatusCodes.Status503ServiceUnavailable);
+    }
+}
+
 public partial class Program;

src/Jiaowu.Api/appsettings.Development.json

@@ -5,6 +5,9 @@
   "ConnectionStrings": {
     "SQLite": "Data Source=data/jiaowu-dev.sqlite"
   },
+  "Cache": {
+    "Enabled": true
+  },
   "Jwt": {
     "Key": "jiaowu-development-secret-key-change-before-production",
     "ExpireMinutes": 480

src/Jiaowu.Api/appsettings.json

@@ -5,7 +5,19 @@
     "CommandTimeoutSeconds": 30
   },
   "ConnectionStrings": {
-    "MySql": ""
+    "MySql": "",
+    "Redis": ""
+  },
+  "Cache": {
+    "Enabled": true,
+    "KeyPrefix": "jiaowu:v1",
+    "ReferenceExpirationMinutes": 30,
+    "ReferenceLocalExpirationSeconds": 120,
+    "TimetableExpirationMinutes": 10,
+    "TimetableLocalExpirationSeconds": 30,
+    "AnalyticsExpirationMinutes": 3,
+    "AnalyticsLocalExpirationSeconds": 30,
+    "MaximumPayloadKilobytes": 2048
   },
   "Jwt": {
     "Issuer": "Jiaowu.Api",

tests/Jiaowu.Api.Tests/AppCacheTests.cs

@@ -0,0 +1,354 @@
+using System.Text.Json;
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
+using Jiaowu.Api.Infrastructure.Timetables;
+using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Options;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class AppCacheTests
+{
+    [Fact]
+    public void Statistics_keys_isolate_data_scope_college_and_filters()
+    {
+        var firstCollege = Guid.NewGuid();
+        var secondCollege = Guid.NewGuid();
+        var term = Guid.NewGuid().ToString("N");
+
+        var first = AppCacheKeys.Statistics(
+            "grades",
+            "College",
+            firstCollege,
+            term,
+            "-");
+        var otherCollege = AppCacheKeys.Statistics(
+            "grades",
+            "College",
+            secondCollege,
+            term,
+            "-");
+        var otherScope = AppCacheKeys.Statistics(
+            "grades",
+            "All",
+            firstCollege,
+            term,
+            "-");
+        var otherFilter = AppCacheKeys.Statistics(
+            "grades",
+            "College",
+            firstCollege,
+            Guid.NewGuid().ToString("N"),
+            "-");
+
+        Assert.NotEqual(first, otherCollege);
+        Assert.NotEqual(first, otherScope);
+        Assert.NotEqual(first, otherFilter);
+        Assert.Equal(
+            first,
+            AppCacheKeys.Statistics(
+                " GRADES ",
+                "COLLEGE",
+                firstCollege,
+                term,
+                null));
+    }
+
+    [Fact]
+    public async Task Hybrid_cache_reuses_value_and_tag_invalidation_reloads_source()
+    {
+        await using var provider = CreateProvider(enabled: true);
+        var cache = provider.GetRequiredService<IAppCache>();
+        var sourceCalls = 0;
+        var key = $"test:{Guid.NewGuid():N}";
+
+        Task<int> Load(CancellationToken _)
+        {
+            sourceCalls++;
+            return Task.FromResult(sourceCalls);
+        }
+
+        var first = await cache.GetOrCreateAsync(
+            key,
+            Load,
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            CancellationToken.None);
+        var second = await cache.GetOrCreateAsync(
+            key,
+            Load,
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            CancellationToken.None);
+
+        Assert.Equal(1, first);
+        Assert.Equal(1, second);
+        Assert.Equal(1, sourceCalls);
+
+        await cache.RemoveByTagAsync(AppCacheTags.BaseData);
+        var afterInvalidation = await cache.GetOrCreateAsync(
+            key,
+            Load,
+            AppCacheProfile.ReferenceData,
+            [AppCacheTags.BaseData],
+            CancellationToken.None);
+
+        Assert.Equal(2, afterInvalidation);
+        Assert.Equal(2, sourceCalls);
+    }
+
+    [Fact]
+    public async Task Disabled_cache_always_uses_source()
+    {
+        await using var provider = CreateProvider(enabled: false);
+        var cache = provider.GetRequiredService<IAppCache>();
+        var sourceCalls = 0;
+
+        Task<int> Load(CancellationToken _)
+        {
+            sourceCalls++;
+            return Task.FromResult(sourceCalls);
+        }
+
+        var first = await cache.GetOrCreateAsync(
+            "disabled",
+            Load,
+            AppCacheProfile.ReferenceData,
+            [],
+            CancellationToken.None);
+        var second = await cache.GetOrCreateAsync(
+            "disabled",
+            Load,
+            AppCacheProfile.ReferenceData,
+            [],
+            CancellationToken.None);
+
+        Assert.Equal(1, first);
+        Assert.Equal(2, second);
+    }
+
+    [Fact]
+    public async Task Timetable_data_round_trips_through_distributed_cache()
+    {
+        IDistributedCache distributedCache = new SharedDistributedCache(
+            new MemoryDistributedCache(
+                Options.Create(new MemoryDistributedCacheOptions())));
+        var keyPrefix = $"tests:{Guid.NewGuid():N}";
+        await using var writer = CreateProvider(true, distributedCache, keyPrefix);
+        var source = CreateTimetableData();
+
+        await writer.GetRequiredService<IAppCache>().GetOrCreateAsync(
+            "timetable",
+            _ => Task.FromResult(source),
+            AppCacheProfile.PublishedTimetable,
+            [AppCacheTags.Timetables],
+            CancellationToken.None);
+
+        await using var reader = CreateProvider(true, distributedCache, keyPrefix);
+        var sourceCalled = false;
+        var result = await reader.GetRequiredService<IAppCache>().GetOrCreateAsync(
+            "timetable",
+            _ =>
+            {
+                sourceCalled = true;
+                return Task.FromResult(source);
+            },
+            AppCacheProfile.PublishedTimetable,
+            [AppCacheTags.Timetables],
+            CancellationToken.None);
+
+        Assert.False(sourceCalled);
+        Assert.Equal(source.Term.Id, result.Term.Id);
+        Assert.Equal(source.Plan!.Id, result.Plan!.Id);
+        Assert.Equal("缓存测试课程", result.Entries.Single().CourseName);
+        Assert.Equal(new TimeOnly(8, 45), result.Slots.Single().EndsAt);
+    }
+
+    [Fact]
+    public async Task Analytics_json_round_trips_through_distributed_cache()
+    {
+        IDistributedCache distributedCache = new SharedDistributedCache(
+            new MemoryDistributedCache(
+                Options.Create(new MemoryDistributedCacheOptions())));
+        var keyPrefix = $"tests:{Guid.NewGuid():N}";
+        var source = JsonSerializer.SerializeToElement(new
+        {
+            totals = new { totalCourses = 3 }
+        });
+
+        await using (var writer = CreateProvider(
+                         true,
+                         distributedCache,
+                         keyPrefix))
+        {
+            await writer.GetRequiredService<IAppCache>().GetOrCreateAsync(
+                "statistics:courses",
+                _ => Task.FromResult(source),
+                AppCacheProfile.Analytics,
+                [AppCacheTags.Analytics],
+                CancellationToken.None);
+        }
+
+        await using var reader = CreateProvider(
+            true,
+            distributedCache,
+            keyPrefix);
+        var sourceCalled = false;
+        var result = await reader.GetRequiredService<IAppCache>()
+            .GetOrCreateAsync(
+                "statistics:courses",
+                _ =>
+                {
+                    sourceCalled = true;
+                    return Task.FromResult(source);
+                },
+                AppCacheProfile.Analytics,
+                [AppCacheTags.Analytics],
+                CancellationToken.None);
+
+        Assert.False(sourceCalled);
+        Assert.Equal(
+            3,
+            result.GetProperty("totals")
+                .GetProperty("totalCourses")
+                .GetInt32());
+    }
+
+    private static ServiceProvider CreateProvider(
+        bool enabled,
+        IDistributedCache? distributedCache = null,
+        string? keyPrefix = null)
+    {
+        var services = new ServiceCollection();
+        services.AddLogging();
+        services.AddHybridCache();
+        if (distributedCache is not null)
+            services.AddSingleton(distributedCache);
+        services.AddSingleton(new AppCacheOptions
+        {
+            Enabled = enabled,
+            KeyPrefix = keyPrefix ?? $"tests:{Guid.NewGuid():N}"
+        });
+        services.AddSingleton<IHostEnvironment>(new TestHostEnvironment());
+        services.AddSingleton<IAppCache, HybridAppCache>();
+        return services.BuildServiceProvider();
+    }
+
+    private static TimetableData CreateTimetableData()
+    {
+        var termId = Guid.NewGuid();
+        var planId = Guid.NewGuid();
+        var taskId = Guid.NewGuid();
+        return new TimetableData(
+            new TimetableTermDto(
+                termId,
+                "2026-2027 学年第一学期",
+                "2026-2027",
+                TermSeason.Autumn,
+                new DateOnly(2026, 9, 1),
+                new DateOnly(2027, 1, 20),
+                true),
+            new TimetableSubjectDto(
+                Guid.NewGuid(),
+                "SE202601",
+                "软件工程 2026 级 1 班",
+                TimetableResourceType.Class,
+                2026,
+                Guid.NewGuid(),
+                "软件工程",
+                Guid.NewGuid(),
+                "计算机学院",
+                null,
+                null,
+                null),
+            null,
+            null,
+            new TimetablePlanDto(
+                planId,
+                "正式课表",
+                "V1",
+                SchedulePlanStatus.Published,
+                DateTime.UtcNow,
+                DateTime.UtcNow),
+            [
+                new TimetableSlotDto(
+                    1,
+                    "第 1 节",
+                    new TimeOnly(8, 0),
+                    new TimeOnly(8, 45))
+            ],
+            [
+                new TimetableEntryDto(
+                    Guid.NewGuid(),
+                    taskId,
+                    "TASK-001",
+                    "缓存测试教学班",
+                    "CACHE-01",
+                    "缓存测试课程",
+                    ["测试教师"],
+                    ["软件工程 2026 级 1 班"],
+                    "第一教学楼 101",
+                    "第一教学楼",
+                    "主校区",
+                    1,
+                    1,
+                    2,
+                    1,
+                    16,
+                    WeekPattern.All,
+                    null)
+            ],
+            [],
+            []);
+    }
+
+    private sealed class TestHostEnvironment : IHostEnvironment
+    {
+        public string EnvironmentName { get; set; } = Environments.Development;
+        public string ApplicationName { get; set; } = nameof(AppCacheTests);
+        public string ContentRootPath { get; set; } = AppContext.BaseDirectory;
+        public IFileProvider ContentRootFileProvider { get; set; } = new NullFileProvider();
+    }
+
+    private sealed class SharedDistributedCache(IDistributedCache inner)
+        : IDistributedCache
+    {
+        public byte[]? Get(string key) => inner.Get(key);
+
+        public Task<byte[]?> GetAsync(
+            string key,
+            CancellationToken token = default) =>
+            inner.GetAsync(key, token);
+
+        public void Refresh(string key) => inner.Refresh(key);
+
+        public Task RefreshAsync(
+            string key,
+            CancellationToken token = default) =>
+            inner.RefreshAsync(key, token);
+
+        public void Remove(string key) => inner.Remove(key);
+
+        public Task RemoveAsync(
+            string key,
+            CancellationToken token = default) =>
+            inner.RemoveAsync(key, token);
+
+        public void Set(
+            string key,
+            byte[] value,
+            DistributedCacheEntryOptions options) =>
+            inner.Set(key, value, options);
+
+        public Task SetAsync(
+            string key,
+            byte[] value,
+            DistributedCacheEntryOptions options,
+            CancellationToken token = default) =>
+            inner.SetAsync(key, value, options, token);
+    }
+}

tests/Jiaowu.Api.Tests/AuthControllerTests.cs

@@ -2,6 +2,7 @@ using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
@@ -103,7 +104,11 @@ public sealed class AuthControllerTests
         var userManager = scope.ServiceProvider
             .GetRequiredService<UserManager<ApplicationUser>>();
         Assert.True(db.Database.CreateExecutionStrategy().RetriesOnFailure);
-        var controller = new AuthController(db, userManager, new StubTokenService());
+        var controller = new AuthController(
+            db,
+            userManager,
+            new StubTokenService(),
+            NoOpAppCache.Instance);
         var request = new StudentActivationRequest(
             student.Name,
             student.StudentNumber,

tests/Jiaowu.Api.Tests/BaseDataControllerTests.cs

@@ -1,5 +1,6 @@
 using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Data.Sqlite;
@@ -21,7 +22,7 @@ public sealed class BaseDataControllerTests : IAsyncDisposable
             .Options;
         db = new AppDbContext(options);
         db.Database.EnsureCreated();
-        controller = new BaseDataController(db);
+        controller = new BaseDataController(db, NoOpAppCache.Instance);
     }
 
     [Fact]

tests/Jiaowu.Api.Tests/PersonnelControllerTests.cs

@@ -2,6 +2,7 @@ using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
@@ -61,7 +62,8 @@ public sealed class PersonnelControllerTests
         var controller = new PersonnelController(
             db,
             new TestDataScope(college.Id),
-            userManager);
+            userManager,
+            NoOpAppCache.Instance);
 
         var result = await controller.ActivateTeacherAccount(
             teacher.Id,

tests/Jiaowu.Api.Tests/SchedulePublishJobProcessorTests.cs

@@ -1,4 +1,5 @@
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Jiaowu.Api.Infrastructure.Scheduling;
 using Microsoft.EntityFrameworkCore;
@@ -47,6 +48,7 @@ public sealed class SchedulePublishJobProcessorTests
                 $"Data Source={databasePath};Pooling=False"));
         services.AddScoped<SchedulePlanPublisher>();
         services.AddScoped<SchedulePublishJobProcessor>();
+        services.AddSingleton<IAppCache>(NoOpAppCache.Instance);
         var provider = services.BuildServiceProvider();
 
         try

tests/Jiaowu.Api.Tests/ScheduleSettingsControllerTests.cs

@@ -1,5 +1,6 @@
 using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Data.Sqlite;
@@ -70,7 +71,7 @@ public sealed class ScheduleSettingsControllerTests
             secondTask);
         await db.SaveChangesAsync();
 
-        var controller = new ScheduleSettingsController(db);
+        var controller = new ScheduleSettingsController(db, NoOpAppCache.Instance);
         var result = await controller.SaveConstraintsBatch(
             new TeachingTaskScheduleConstraintBatchRequest(
                 term.Id,
@@ -174,7 +175,7 @@ public sealed class ScheduleSettingsControllerTests
         db.AddRange(college, course, term, teacher, classroom, task, constraint);
         await db.SaveChangesAsync();
 
-        var result = await new ScheduleSettingsController(db)
+        var result = await new ScheduleSettingsController(db, NoOpAppCache.Instance)
             .GetConstraints(term.Id, CancellationToken.None);
 
         var ok = Assert.IsType<OkObjectResult>(result);
@@ -269,20 +270,26 @@ public sealed class ScheduleSettingsControllerTests
         await db.SaveChangesAsync();
         db.ChangeTracker.Clear();
 
-        var result = await new ScheduleSettingsController(db)
+        var result = await new ScheduleSettingsController(db, NoOpAppCache.Instance)
             .GetConstraints(term.Id, CancellationToken.None);
 
         var ok = Assert.IsType<OkObjectResult>(result);
         var payload = Assert.IsAssignableFrom<IEnumerable>(ok.Value);
         Assert.Contains(payload.Cast<object>(), item =>
             JsonSerializer.Serialize(item).Contains(task.TaskNumber));
-        var timeSlotsResult = await new ScheduleSettingsController(db)
+        var timeSlotsResult = await new ScheduleSettingsController(
+                db,
+                NoOpAppCache.Instance)
             .GetTimeSlots(term.Id, CancellationToken.None);
         var timeSlotsOk = Assert.IsType<OkObjectResult>(timeSlotsResult);
         var timeSlotsJson = JsonSerializer.Serialize(timeSlotsOk.Value);
         Assert.Contains("08:00", timeSlotsJson);
 
-        var examTimeSlotsResult = await new ExamsController(db, null!, null!)
+        var examTimeSlotsResult = await new ExamsController(
+                db,
+                null!,
+                null!,
+                NoOpAppCache.Instance)
             .GetTimeSlotsForTerm(term.Id, CancellationToken.None);
         var examTimeSlotsOk =
             Assert.IsType<OkObjectResult>(examTimeSlotsResult);

tests/Jiaowu.Api.Tests/StatisticsControllerTests.cs

@@ -0,0 +1,150 @@
+using System.Text.Json;
+using ClosedXML.Excel;
+using Jiaowu.Api.Controllers;
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class StatisticsControllerTests
+{
+    [Fact]
+    public async Task Course_summary_cache_is_scope_isolated_and_export_is_fresh()
+    {
+        await using var connection = new SqliteConnection("Data Source=:memory:");
+        await connection.OpenAsync();
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseSqlite(connection)
+            .Options;
+        await using var db = new AppDbContext(options);
+        await db.Database.EnsureCreatedAsync();
+
+        var firstCollege = new College { Code = "C01", Name = "第一学院" };
+        var secondCollege = new College { Code = "C02", Name = "第二学院" };
+        var category = new CourseCategory { Code = "CAT", Name = "测试分类" };
+        db.AddRange(
+            firstCollege,
+            secondCollege,
+            category,
+            CreateCourse("C001", firstCollege, category),
+            CreateCourse("C002", secondCollege, category));
+        await db.SaveChangesAsync();
+
+        var cache = new RecordingCache();
+        var firstController = new StatisticsController(
+            db,
+            new CollegeDataScope(firstCollege.Id),
+            cache);
+        var secondController = new StatisticsController(
+            db,
+            new CollegeDataScope(secondCollege.Id),
+            cache);
+
+        var first = await firstController.GetCourseSummary(
+            null,
+            null,
+            null,
+            CancellationToken.None);
+        Assert.Equal(1, TotalCourses(first));
+
+        db.Courses.Add(CreateCourse("C003", firstCollege, category));
+        await db.SaveChangesAsync();
+
+        var cached = await firstController.GetCourseSummary(
+            null,
+            null,
+            null,
+            CancellationToken.None);
+        Assert.Equal(1, TotalCourses(cached));
+
+        var otherCollege = await secondController.GetCourseSummary(
+            null,
+            null,
+            null,
+            CancellationToken.None);
+        Assert.Equal(1, TotalCourses(otherCollege));
+        Assert.Equal(2, cache.SourceCalls);
+        Assert.Equal(2, cache.Keys.Count);
+
+        var export = await firstController.ExportCourses(
+            null,
+            null,
+            null,
+            CancellationToken.None);
+        var file = Assert.IsType<FileContentResult>(export);
+        using var stream = new MemoryStream(file.FileContents);
+        using var workbook = new XLWorkbook(stream);
+        Assert.Equal(
+            2,
+            workbook.Worksheet("课程性质").Cell(1, 2).GetValue<int>());
+        Assert.Equal(2, cache.SourceCalls);
+    }
+
+    private static int TotalCourses(ActionResult<object> result)
+    {
+        var json = Assert.IsType<JsonElement>(result.Value);
+        return json.GetProperty("totals").GetProperty("totalCourses").GetInt32();
+    }
+
+    private static Course CreateCourse(
+        string code,
+        College college,
+        CourseCategory category) =>
+        new()
+        {
+            Code = code,
+            Name = $"课程 {code}",
+            CollegeId = college.Id,
+            CourseCategoryId = category.Id,
+            Nature = CourseNature.MajorRequired,
+            Credits = 2,
+            TotalHours = 32,
+            LectureHours = 32,
+            AssessmentMethod = AssessmentMethod.Examination
+        };
+
+    private sealed class RecordingCache : IAppCache
+    {
+        private readonly Dictionary<string, object> values = [];
+
+        public int SourceCalls { get; private set; }
+        public IReadOnlyCollection<string> Keys => values.Keys;
+
+        public async Task<T> GetOrCreateAsync<T>(
+            string key,
+            Func<CancellationToken, Task<T>> factory,
+            AppCacheProfile profile,
+            IReadOnlyCollection<string> tags,
+            CancellationToken cancellationToken)
+        {
+            if (values.TryGetValue(key, out var value))
+                return (T)value;
+
+            SourceCalls++;
+            var loaded = await factory(cancellationToken);
+            values[key] = loaded!;
+            return loaded;
+        }
+
+        public ValueTask RemoveByTagAsync(
+            string tag,
+            CancellationToken cancellationToken = default) =>
+            ValueTask.CompletedTask;
+    }
+
+    private sealed class CollegeDataScope(Guid collegeId) : ICurrentUserDataScope
+    {
+        public CurrentUserScope Current { get; } = new(
+            Guid.NewGuid(),
+            "学院管理员",
+            collegeId,
+            DataScope.College,
+            new HashSet<string> { SystemRoles.CollegeAdmin });
+    }
+}

tests/Jiaowu.Api.Tests/TeachingTasksControllerTests.cs

@@ -2,6 +2,7 @@ using Jiaowu.Api.Controllers;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Persistence;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Data.Sqlite;
@@ -146,7 +147,8 @@ public sealed class TeachingTasksControllerTests
             this.course = course;
             Controller = new TeachingTasksController(
                 db,
-                dataScope);
+                dataScope,
+                NoOpAppCache.Instance);
         }
 
         public AppDbContext Db { get; }