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

默认 Redis 缓存 3 分钟、本地缓存 30 秒，可通过环境变量调整。缓存键包含数据权限范围、有效学院和全部筛选条件，避免跨学院串数据。 Excel 导出保持实时查询，不使用摘要缓存。无需数据库迁移。
2026-07-26 15:13:22 +08:00
parent 77dfa8145c
commit 631c81821d
10 changed files with 651 additions and 80 deletions
@@ -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);
    }
 }
@@ -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)