已改成后台“检查并发布”任务，原来的超时主要就是同步逐条校验导致的。

发布接口立即返回 202 Accepted，页面轮询显示检查进度。
校验改为批量读取，减少重复数据库查询。
检查失败保留草稿并显示具体原因；成功后原子完成旧课表归档和新课表发布。
同一学期禁止两个发布任务并发，服务重启后未完成任务会自动恢复。
发布期间锁定编辑、自动排课等冲突操作。
已补齐 SQLite 开发迁移及 MySQL 生产迁移。

src/Jiaowu.Api/Controllers/SchedulesController.cs

@@ -16,7 +16,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/schedules")]
 public sealed class SchedulesController(
     AppDbContext db,
-    AutomaticScheduleJobQueue automaticScheduleJobQueue) : ControllerBase
+    AutomaticScheduleJobQueue automaticScheduleJobQueue,
+    SchedulePublishJobQueue schedulePublishJobQueue) : ControllerBase
 {
     private const string ManagementRoles =
         SystemRoles.SuperAdmin + "," +
@@ -130,8 +131,8 @@ public sealed class SchedulesController(
     {
         var plan = await db.SchedulePlans.FindAsync([id], cancellationToken);
         if (plan is null) return NotFound();
-        if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(id, cancellationToken))
+            return ScheduleJobRunningProblem();
         if (plan.Status != SchedulePlanStatus.Draft)
             return ConflictProblem("已发布或已归档的排课版本不可直接修改。");
         if (!await db.AcademicTerms.AnyAsync(
@@ -151,8 +152,8 @@ public sealed class SchedulesController(
         CloneSchedulePlanRequest request,
         CancellationToken cancellationToken)
     {
-        if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(id, cancellationToken))
+            return ScheduleJobRunningProblem();
         var source = await db.SchedulePlans.AsNoTracking()
             .Include(x => x.Entries)
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
@@ -185,8 +186,8 @@ public sealed class SchedulesController(
     {
         var plan = await db.SchedulePlans.FindAsync([id], cancellationToken);
         if (plan is null) return NotFound();
-        if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(id, cancellationToken))
+            return ScheduleJobRunningProblem();
         if (plan.Status != SchedulePlanStatus.Draft)
             return ConflictProblem("仅草稿排课版本可以删除。");
         db.SchedulePlans.Remove(plan);
@@ -194,76 +195,79 @@ public sealed class SchedulesController(
     }
 
     [HttpPost("plans/{id:guid}/publish")]
-    public async Task<ActionResult> PublishPlan(Guid id, CancellationToken cancellationToken)
+    public async Task<ActionResult<SchedulePublishJobResponse>> PublishPlan(
+        Guid id,
+        CancellationToken cancellationToken)
     {
         if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
             return AutomaticScheduleRunningProblem();
-        var plan = await db.SchedulePlans
-            .Include(x => x.Entries)
-            .ThenInclude(x => x.TeachingTask)
-            .ThenInclude(x => x!.Teachers)
-            .Include(x => x.Entries)
-            .ThenInclude(x => x.TeachingTask)
-            .ThenInclude(x => x!.Classes)
+        var plan = await db.SchedulePlans.AsNoTracking()
+            .Select(x => new
+            {
+                x.Id,
+                x.AcademicTermId,
+                x.Status,
+                HasEntries = x.Entries.Any()
+            })
             .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
         if (plan is null) return NotFound();
         if (plan.Status != SchedulePlanStatus.Draft)
             return ConflictProblem("只有草稿排课版本可以发布。");
-        if (plan.Entries.Count == 0)
+        if (!plan.HasEntries)
             return ConflictProblem("排课版本中至少需要一条课表安排。");
 
-        foreach (var entry in plan.Entries)
-        {
-            var validation = await ValidateEntryAsync(
-                plan,
-                entry.Id,
-                new ScheduleEntryRequest(
-                    entry.TeachingTaskId,
-                    entry.ClassroomId,
-                    entry.DayOfWeek,
-                    entry.StartPeriod,
-                    entry.PeriodCount,
-                    entry.StartWeek,
-                    entry.EndWeek,
-                    entry.WeekPattern,
-                    entry.Notes),
+        var existing = await db.SchedulePublishJobs.AsNoTracking()
+            .FirstOrDefaultAsync(
+                x => x.ActiveAcademicTermId == plan.AcademicTermId,
                 cancellationToken);
-            if (validation is not null) return validation;
+        if (existing is not null)
+        {
+            if (existing.SchedulePlanId != id)
+                return ConflictProblem(
+                    "同一学期已有课表正在后台检查并发布，请等待任务完成。");
+            return AcceptedAtAction(
+                nameof(GetSchedulePublishJob),
+                new { jobId = existing.Id },
+                ToResponse(existing));
         }
 
-        var requiredTasks = await db.TeachingTasks.AsNoTracking()
-             .Where(x =>
-                 x.AcademicTermId == plan.AcademicTermId &&
-                 x.Status == TeachingTaskStatus.Published &&
-                 x.SchedulingMode == TeachingTaskSchedulingMode.Standard)
-            .Select(x => new { x.Id, x.TaskNumber, x.Name, x.WeeklyHours })
-            .ToListAsync(cancellationToken);
-        var scheduledHours = plan.Entries
-            .GroupBy(x => x.TeachingTaskId)
-            .ToDictionary(group => group.Key, group => group.Sum(x => x.PeriodCount));
-        var incomplete = requiredTasks.FirstOrDefault(task =>
-            !scheduledHours.TryGetValue(task.Id, out var hours) ||
-            hours < task.WeeklyHours);
-        if (incomplete is not null)
-            return ConflictProblem(
-                $"{incomplete.TaskNumber} · {incomplete.Name} 尚未达到每周 {incomplete.WeeklyHours} 学时，不能发布。");
+        var requestedByUserId = CurrentUserId();
+        var job = new SchedulePublishJob
+        {
+            SchedulePlanId = id,
+            AcademicTermId = plan.AcademicTermId,
+            ActiveAcademicTermId = plan.AcademicTermId,
+            RequestedByUserId = requestedByUserId,
+            CurrentStep = "等待后台检查"
+        };
+        db.SchedulePublishJobs.Add(job);
+        try
+        {
+            await db.SaveChangesAsync(cancellationToken);
+        }
+        catch (DbUpdateException)
+        {
+            db.Entry(job).State = EntityState.Detached;
+            existing = await db.SchedulePublishJobs.AsNoTracking()
+                .FirstOrDefaultAsync(
+                    x => x.ActiveAcademicTermId == plan.AcademicTermId,
+                    cancellationToken);
+            if (existing is null)
+                throw;
+            if (existing.SchedulePlanId != id)
+                return ConflictProblem(
+                    "同一学期已有课表正在后台检查并发布，请等待任务完成。");
+            return AcceptedAtAction(
+                nameof(GetSchedulePublishJob),
+                new { jobId = existing.Id },
+                ToResponse(existing));
+        }
 
-        var conflict = ScheduleConflictDetector.FindConflict(plan.Entries.ToList());
-        if (conflict is not null) return ConflictProblem(conflict);
-
-        await using var transaction = await db.Database.BeginTransactionAsync(cancellationToken);
-        var previous = await db.SchedulePlans
-            .Where(x =>
-                x.Id != plan.Id &&
-                x.AcademicTermId == plan.AcademicTermId &&
-                x.Status == SchedulePlanStatus.Published)
-            .ToListAsync(cancellationToken);
-        foreach (var oldPlan in previous) oldPlan.Status = SchedulePlanStatus.Archived;
-        plan.Status = SchedulePlanStatus.Published;
-        plan.PublishedAt = DateTime.UtcNow;
-        await db.SaveChangesAsync(cancellationToken);
-        await transaction.CommitAsync(cancellationToken);
-        return NoContent();
+        schedulePublishJobQueue.Enqueue(job.Id);
+        return AcceptedAtAction(
+            nameof(GetSchedulePublishJob),
+            new { jobId = job.Id },
+            ToResponse(job));
     }
 
     [HttpPost("plans/{planId:guid}/entries")]
@@ -272,8 +276,8 @@ public sealed class SchedulesController(
         ScheduleEntryRequest request,
         CancellationToken cancellationToken)
     {
-        if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(planId, cancellationToken))
+            return ScheduleJobRunningProblem();
         var plan = await DraftPlanAsync(planId, cancellationToken);
         if (plan is null) return NotFound();
         var validation = await ValidateEntryAsync(plan, null, request, cancellationToken);
@@ -290,6 +294,8 @@ public sealed class SchedulesController(
     {
         var plan = await DraftPlanAsync(planId, cancellationToken);
         if (plan is null) return NotFound();
+        if (await HasActiveSchedulePublishJobAsync(planId, cancellationToken))
+            return SchedulePublishRunningProblem();
 
         var existing = await db.AutomaticScheduleJobs.AsNoTracking()
             .FirstOrDefaultAsync(
@@ -364,6 +370,30 @@ public sealed class SchedulesController(
         return Ok(job is null ? null : ToResponse(job));
     }
 
+    [HttpGet("publish-jobs/{jobId:guid}")]
+    public async Task<ActionResult<SchedulePublishJobResponse>>
+        GetSchedulePublishJob(
+            Guid jobId,
+            CancellationToken cancellationToken)
+    {
+        var job = await db.SchedulePublishJobs.AsNoTracking()
+            .FirstOrDefaultAsync(x => x.Id == jobId, cancellationToken);
+        return job is null ? NotFound() : Ok(ToResponse(job));
+    }
+
+    [HttpGet("plans/{planId:guid}/publish-job")]
+    public async Task<ActionResult<SchedulePublishJobResponse?>>
+        GetLatestSchedulePublishJob(
+            Guid planId,
+            CancellationToken cancellationToken)
+    {
+        var job = await db.SchedulePublishJobs.AsNoTracking()
+            .Where(x => x.SchedulePlanId == planId)
+            .OrderByDescending(x => x.CreatedAt)
+            .FirstOrDefaultAsync(cancellationToken);
+        return Ok(job is null ? null : ToResponse(job));
+    }
+
     [HttpPut("plans/{planId:guid}/entries/{entryId:guid}")]
     public async Task<ActionResult> UpdateEntry(
         Guid planId,
@@ -371,8 +401,8 @@ public sealed class SchedulesController(
         ScheduleEntryRequest request,
         CancellationToken cancellationToken)
     {
-        if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(planId, cancellationToken))
+            return ScheduleJobRunningProblem();
         var plan = await DraftPlanAsync(planId, cancellationToken);
         if (plan is null) return NotFound();
         var entry = await db.ScheduleEntries
@@ -400,8 +430,8 @@ public sealed class SchedulesController(
         Guid entryId,
         CancellationToken cancellationToken)
     {
-        if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
-            return AutomaticScheduleRunningProblem();
+        if (await HasActiveScheduleJobAsync(planId, cancellationToken))
+            return ScheduleJobRunningProblem();
         if (await DraftPlanAsync(planId, cancellationToken) is null) return NotFound();
         var entry = await db.ScheduleEntries
             .FirstOrDefaultAsync(
@@ -426,6 +456,19 @@ public sealed class SchedulesController(
             x => x.ActiveSchedulePlanId == planId,
             cancellationToken);
 
+    private Task<bool> HasActiveSchedulePublishJobAsync(
+        Guid planId,
+        CancellationToken cancellationToken) =>
+        db.SchedulePublishJobs.AsNoTracking().AnyAsync(
+            x => x.SchedulePlanId == planId && x.ActiveAcademicTermId != null,
+            cancellationToken);
+
+    private async Task<bool> HasActiveScheduleJobAsync(
+        Guid planId,
+        CancellationToken cancellationToken) =>
+        await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken) ||
+        await HasActiveSchedulePublishJobAsync(planId, cancellationToken);
+
     private async Task<ActionResult?> ValidateEntryAsync(
         SchedulePlan plan,
         Guid? entryId,
@@ -585,6 +628,12 @@ public sealed class SchedulesController(
     private ActionResult AutomaticScheduleRunningProblem() =>
         ConflictProblem("自动排课正在后台运行，请等待任务完成后再修改该排课版本。");
 
+    private ActionResult SchedulePublishRunningProblem() =>
+        ConflictProblem("课表正在后台检查并发布，请等待任务完成后再修改。");
+
+    private ActionResult ScheduleJobRunningProblem() =>
+        ConflictProblem("后台任务正在处理该排课版本，请等待任务完成后再修改。");
+
     private static AutomaticScheduleJobResponse ToResponse(AutomaticScheduleJob job)
     {
         IReadOnlyList<string> messages = [];
@@ -608,6 +657,24 @@ public sealed class SchedulesController(
             job.CompletedAt);
     }
 
+    private static SchedulePublishJobResponse ToResponse(SchedulePublishJob job) =>
+        new(
+            job.Id,
+            job.SchedulePlanId,
+            job.Status,
+            job.TotalSteps,
+            job.CompletedSteps,
+            job.CurrentStep,
+            job.ErrorMessage,
+            job.CreatedAt,
+            job.StartedAt,
+            job.CompletedAt);
+
+    private Guid? CurrentUserId() =>
+        Guid.TryParse(User.FindFirstValue(ClaimTypes.NameIdentifier), out var userId)
+            ? userId
+            : null;
+
     private static string? Normalize(string? value) =>
         string.IsNullOrWhiteSpace(value) ? null : value.Trim();
 }
@@ -646,3 +713,15 @@ public sealed record AutomaticScheduleJobResponse(
     DateTime CreatedAt,
     DateTime? StartedAt,
     DateTime? CompletedAt);
+
+public sealed record SchedulePublishJobResponse(
+    Guid Id,
+    Guid SchedulePlanId,
+    SchedulePublishJobStatus Status,
+    int TotalSteps,
+    int CompletedSteps,
+    string? CurrentStep,
+    string? ErrorMessage,
+    DateTime CreatedAt,
+    DateTime? StartedAt,
+    DateTime? CompletedAt);