学年学期页面新增“设为当前”“归档”“撤销归档”，当前学期不能归档、删除或直接取消；已归档学期需先撤销才能重新设为当前。[BaseDataController.cs (line 286)](/E:/jiaowu/src/Jiaowu.Api/Controllers/BaseDataController.cs:286)

切换后，其他学期自动变为历史态；已归档学期进一步弱化。所有主要学期选择器统一默认当前，并显示“当前 / 历史 / 已归档”。[academicTerms.ts (line 1)](/E:/jiaowu/web/src/utils/academicTerms.ts:1)
桌面使用分层表格，390px 手机端改为独立学期卡片，操作不会再挤压表格。[BaseDataView.vue (line 211)](/E:/jiaowu/web/src/views/BaseDataView.vue:211)
归档定义为“历史显示状态”，不是成绩冻结：补考成绩仍可录入并回写，已发布成绩仍可走成绩更正审批。
已加入 SQLite 开发迁移、MySQL 正式迁移和切换/归档/撤销测试。[20260726143000_AcademicTermArchiving.cs (line 1)](/E:/jiaowu/src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260726143000_AcademicTermArchiving.cs:1)

src/Jiaowu.Api/Infrastructure/Persistence/AppDbContext.cs

@@ -167,8 +167,11 @@ public sealed class AppDbContext(DbContextOptions<AppDbContext> options)
             .HasForeignKey(x => x.BuildingId)
             .OnDelete(DeleteBehavior.Restrict);
 
-        builder.Entity<AcademicTerm>()
-            .HasIndex(x => x.IsCurrent);
+        builder.Entity<AcademicTerm>(entity =>
+        {
+            entity.HasIndex(x => x.IsCurrent);
+            entity.HasIndex(x => x.IsArchived);
+        });
 
         builder.Entity<Teacher>(entity =>
         {

src/Jiaowu.Api/Infrastructure/Persistence/DevelopmentSqliteMigrator.cs

@@ -46,6 +46,8 @@ public sealed class DevelopmentSqliteMigrator(
         "20260725_24_approval_tables";
     private const string AcademicWarningsMigration =
         "20260725_25_academic_warnings";
+    private const string AcademicTermArchivingMigration =
+        "20260726_27_academic_term_archiving";
 
     public async Task MigrateAsync(CancellationToken cancellationToken = default)
     {
@@ -329,6 +331,19 @@ public sealed class DevelopmentSqliteMigrator(
             MakeupExamAutoJobsMigration,
             makeupAutoJobsExist ? [] : MakeupExamAutoJobStatements,
             cancellationToken);
+
+        var academicTermArchivingExists = await db.Database
+            .SqlQueryRaw<int>(
+                """
+                SELECT COUNT(*) AS "Value"
+                FROM pragma_table_info('AcademicTerms')
+                WHERE name = 'IsArchived'
+                """)
+            .AnyAsync(value => value > 0, cancellationToken);
+        await ApplyMigrationAsync(
+            AcademicTermArchivingMigration,
+            academicTermArchivingExists ? [] : AcademicTermArchivingStatements,
+            cancellationToken);
     }
 
     private async Task ApplyMigrationAsync(
@@ -1688,6 +1703,13 @@ public sealed class DevelopmentSqliteMigrator(
         """ALTER TABLE "WarningRules" ADD COLUMN "LastCheckAt" TEXT NULL;"""
     ];
 
+    private static readonly string[] AcademicTermArchivingStatements =
+    [
+        """ALTER TABLE "AcademicTerms" ADD COLUMN "IsArchived" INTEGER NOT NULL DEFAULT 0;""",
+        """ALTER TABLE "AcademicTerms" ADD COLUMN "ArchivedAt" TEXT NULL;""",
+        """CREATE INDEX IF NOT EXISTS "IX_AcademicTerms_IsArchived" ON "AcademicTerms" ("IsArchived");"""
+    ];
+
     private const string TeachingEvaluationMigration = "TeachingEvaluation";
 
     private static readonly string[] TeachingEvaluationStatements =

src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260726143000_AcademicTermArchiving.cs

@@ -0,0 +1,48 @@
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql;
+
+[DbContext(typeof(AppDbContext))]
+[Migration("20260726143000_AcademicTermArchiving")]
+public partial class AcademicTermArchiving : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.AddColumn<DateTime>(
+            name: "ArchivedAt",
+            table: "AcademicTerms",
+            type: "datetime(6)",
+            nullable: true);
+
+        migrationBuilder.AddColumn<bool>(
+            name: "IsArchived",
+            table: "AcademicTerms",
+            type: "tinyint(1)",
+            nullable: false,
+            defaultValue: false);
+
+        migrationBuilder.CreateIndex(
+            name: "IX_AcademicTerms_IsArchived",
+            table: "AcademicTerms",
+            column: "IsArchived");
+    }
+
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.DropIndex(
+            name: "IX_AcademicTerms_IsArchived",
+            table: "AcademicTerms");
+
+        migrationBuilder.DropColumn(
+            name: "ArchivedAt",
+            table: "AcademicTerms");
+
+        migrationBuilder.DropColumn(
+            name: "IsArchived",
+            table: "AcademicTerms");
+    }
+}

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

@@ -29,6 +29,9 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
                         .IsRequired()
                         .HasColumnType("longtext");
 
+                    b.Property<DateTime?>("ArchivedAt")
+                        .HasColumnType("datetime(6)");
+
                     b.Property<string>("Code")
                         .IsRequired()
                         .HasMaxLength(40)
@@ -43,6 +46,9 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
                     b.Property<bool>("IsCurrent")
                         .HasColumnType("tinyint(1)");
 
+                    b.Property<bool>("IsArchived")
+                        .HasColumnType("tinyint(1)");
+
                     b.Property<bool>("IsEnabled")
                         .HasColumnType("tinyint(1)");
 
@@ -70,6 +76,8 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
 
                     b.HasIndex("IsCurrent");
 
+                    b.HasIndex("IsArchived");
+
                     b.HasIndex("IsEnabled", "SortOrder");
 
                     b.ToTable("AcademicTerms");

src/Jiaowu.Api/Infrastructure/Timetables/TimetableDataService.cs

@@ -194,6 +194,7 @@ public sealed class TimetableDataService(AppDbContext db)
             query = query.Where(x => x.Id == academicTermId);
         else
             query = query.OrderByDescending(x => x.IsCurrent)
+                .ThenBy(x => x.IsArchived)
                 .ThenByDescending(x => x.StartDate);
         return await query.Select(x => new TimetableTermDto(
                 x.Id,