给统计缓存加版本并绑定现有基础数据/课表失效标签，同时让演示数据、人员数据写入主动清理统计缓存；不改统计口径、筛选、导出或页面结构。

tests/Jiaowu.Api.Tests/StatisticsControllerTests.cs

@@ -52,6 +52,14 @@ public sealed class StatisticsControllerTests
             null,
             CancellationToken.None);
         Assert.Equal(1, TotalCourses(first));
+        Assert.Equal(
+            new[]
+            {
+                AppCacheTags.Analytics,
+                AppCacheTags.BaseData,
+                AppCacheTags.Timetables
+            },
+            cache.Tags.Single());
 
         db.Courses.Add(CreateCourse("C003", firstCollege, category));
         await db.SaveChangesAsync();
@@ -115,6 +123,7 @@ public sealed class StatisticsControllerTests
 
         public int SourceCalls { get; private set; }
         public IReadOnlyCollection<string> Keys => values.Keys;
+        public List<IReadOnlyCollection<string>> Tags { get; } = [];
 
         public async Task<T> GetOrCreateAsync<T>(
             string key,
@@ -127,6 +136,7 @@ public sealed class StatisticsControllerTests
                 return (T)value;
 
             SourceCalls++;
+            Tags.Add(tags.ToArray());
             var loaded = await factory(cancellationToken);
             values[key] = loaded!;
             return loaded;