Files
Academic-Affairs-System/src/Jiaowu.Api/Controllers/SchedulesController.cs
T
biss fe508054d0 教学任务按 授课周数 × 周学时 = 课程总学时 双端校验,不匹配会显示具体差额并阻止保存;公共课批量生成同样校验。
排课约束增加课程、教师、学院、授课方式、场地要求、约束状态筛选,并支持批量修改当前筛选结果。
新增“非排时课程”授课方式:不进入自动排课
不占星期、节次和教室
不阻塞课表发布
允许正常选课
在班级课表和学生个人课表中单独展示
2026-07-25 08:18:25 +08:00

649 lines
27 KiB
C#

using System.ComponentModel.DataAnnotations;
using System.Security.Claims;
using System.Text.Json;
using Jiaowu.Api.Domain.Academic;
using Jiaowu.Api.Domain.Identity;
using Jiaowu.Api.Infrastructure.Persistence;
using Jiaowu.Api.Infrastructure.Scheduling;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
namespace Jiaowu.Api.Controllers;
[ApiController]
[Authorize(Roles = ManagementRoles)]
[Route("api/schedules")]
public sealed class SchedulesController(
AppDbContext db,
AutomaticScheduleJobQueue automaticScheduleJobQueue) : ControllerBase
{
private const string ManagementRoles =
SystemRoles.SuperAdmin + "," +
SystemRoles.AcademicAdmin;
[HttpGet("plans")]
public async Task<ActionResult> GetPlans(
Guid? academicTermId,
CancellationToken cancellationToken)
{
var source = db.SchedulePlans.AsNoTracking().AsQueryable();
if (academicTermId.HasValue)
source = source.Where(x => x.AcademicTermId == academicTermId);
return Ok(await source
.OrderByDescending(x => x.AcademicTerm!.StartDate)
.ThenByDescending(x => x.CreatedAt)
.Select(x => new
{
x.Id,
x.Name,
x.Version,
x.AcademicTermId,
TermName = x.AcademicTerm!.Name,
x.Status,
x.PublishedAt,
EntryCount = x.Entries.Count,
x.UpdatedAt
})
.ToListAsync(cancellationToken));
}
[HttpGet("plans/{id:guid}")]
public async Task<ActionResult> GetPlan(Guid id, CancellationToken cancellationToken)
{
var plan = await db.SchedulePlans.AsNoTracking()
.Where(x => x.Id == id)
.Select(x => new
{
x.Id,
x.Name,
x.Version,
x.AcademicTermId,
TermName = x.AcademicTerm!.Name,
x.Status,
x.Notes,
x.PublishedAt,
Entries = x.Entries
.OrderBy(entry => entry.DayOfWeek)
.ThenBy(entry => entry.StartPeriod)
.Select(entry => new
{
entry.Id,
entry.TeachingTaskId,
TaskNumber = entry.TeachingTask!.TaskNumber,
TaskName = entry.TeachingTask.Name,
CourseCode = entry.TeachingTask.Course!.Code,
CourseName = entry.TeachingTask.Course.Name,
TeacherNames = entry.TeachingTask.Teachers
.OrderByDescending(item => item.IsPrimary)
.Select(item => item.Teacher!.Name),
ClassNames = entry.TeachingTask.Classes
.Select(item => item.AdministrativeClass!.Name),
entry.ClassroomId,
ClassroomName = entry.Classroom == null
? null
: entry.Classroom.Name,
BuildingName = entry.Classroom == null
? null
: entry.Classroom.Building!.Name,
CampusName = entry.Classroom == null
? null
: entry.Classroom.Building!.Campus!.Name,
entry.DayOfWeek,
entry.StartPeriod,
entry.PeriodCount,
entry.StartWeek,
entry.EndWeek,
entry.WeekPattern,
entry.Notes
})
})
.FirstOrDefaultAsync(cancellationToken);
return plan is null ? NotFound() : Ok(plan);
}
[HttpPost("plans")]
public async Task<ActionResult> CreatePlan(
SchedulePlanRequest request,
CancellationToken cancellationToken)
{
if (!await db.AcademicTerms.AnyAsync(
x => x.Id == request.AcademicTermId && x.IsEnabled,
cancellationToken))
return ValidationProblem("所选学期不存在或已停用。");
var plan = new SchedulePlan
{
AcademicTermId = request.AcademicTermId,
Name = request.Name.Trim(),
Version = request.Version.Trim(),
Notes = Normalize(request.Notes)
};
db.SchedulePlans.Add(plan);
return await SaveAsync(plan.Id, true, cancellationToken);
}
[HttpPut("plans/{id:guid}")]
public async Task<ActionResult> UpdatePlan(
Guid id,
SchedulePlanRequest request,
CancellationToken cancellationToken)
{
var plan = await db.SchedulePlans.FindAsync([id], cancellationToken);
if (plan is null) return NotFound();
if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
return AutomaticScheduleRunningProblem();
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(
x => x.Id == request.AcademicTermId && x.IsEnabled,
cancellationToken))
return ValidationProblem("所选学期不存在或已停用。");
plan.AcademicTermId = request.AcademicTermId;
plan.Name = request.Name.Trim();
plan.Version = request.Version.Trim();
plan.Notes = Normalize(request.Notes);
return await SaveAsync(id, false, cancellationToken);
}
[HttpPost("plans/{id:guid}/clone")]
public async Task<ActionResult> ClonePlan(
Guid id,
CloneSchedulePlanRequest request,
CancellationToken cancellationToken)
{
if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
return AutomaticScheduleRunningProblem();
var source = await db.SchedulePlans.AsNoTracking()
.Include(x => x.Entries)
.FirstOrDefaultAsync(x => x.Id == id, cancellationToken);
if (source is null) return NotFound();
var copy = new SchedulePlan
{
AcademicTermId = source.AcademicTermId,
Name = request.Name.Trim(),
Version = request.Version.Trim(),
Notes = source.Notes,
Entries = source.Entries.Select(entry => new ScheduleEntry
{
TeachingTaskId = entry.TeachingTaskId,
ClassroomId = entry.ClassroomId,
DayOfWeek = entry.DayOfWeek,
StartPeriod = entry.StartPeriod,
PeriodCount = entry.PeriodCount,
StartWeek = entry.StartWeek,
EndWeek = entry.EndWeek,
WeekPattern = entry.WeekPattern,
Notes = entry.Notes
}).ToList()
};
db.SchedulePlans.Add(copy);
return await SaveAsync(copy.Id, true, cancellationToken);
}
[HttpDelete("plans/{id:guid}")]
public async Task<ActionResult> DeletePlan(Guid id, CancellationToken cancellationToken)
{
var plan = await db.SchedulePlans.FindAsync([id], cancellationToken);
if (plan is null) return NotFound();
if (await HasActiveAutomaticScheduleJobAsync(id, cancellationToken))
return AutomaticScheduleRunningProblem();
if (plan.Status != SchedulePlanStatus.Draft)
return ConflictProblem("仅草稿排课版本可以删除。");
db.SchedulePlans.Remove(plan);
return await SaveAsync(id, false, cancellationToken);
}
[HttpPost("plans/{id:guid}/publish")]
public async Task<ActionResult> 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)
.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)
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),
cancellationToken);
if (validation is not null) return validation;
}
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 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();
}
[HttpPost("plans/{planId:guid}/entries")]
public async Task<ActionResult> CreateEntry(
Guid planId,
ScheduleEntryRequest request,
CancellationToken cancellationToken)
{
if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
return AutomaticScheduleRunningProblem();
var plan = await DraftPlanAsync(planId, cancellationToken);
if (plan is null) return NotFound();
var validation = await ValidateEntryAsync(plan, null, request, cancellationToken);
if (validation is not null) return validation;
var entry = CreateEntryEntity(planId, request);
db.ScheduleEntries.Add(entry);
return await SaveAsync(entry.Id, true, cancellationToken);
}
[HttpPost("plans/{planId:guid}/auto-schedule")]
public async Task<ActionResult<AutomaticScheduleJobResponse>> AutoSchedule(
Guid planId,
CancellationToken cancellationToken)
{
var plan = await DraftPlanAsync(planId, cancellationToken);
if (plan is null) return NotFound();
var existing = await db.AutomaticScheduleJobs.AsNoTracking()
.FirstOrDefaultAsync(
x => x.ActiveSchedulePlanId == planId,
cancellationToken);
if (existing is not null)
{
return AcceptedAtAction(
nameof(GetAutomaticScheduleJob),
new { jobId = existing.Id },
ToResponse(existing));
}
var requestedByUserId = Guid.TryParse(
User.FindFirstValue(ClaimTypes.NameIdentifier),
out var userId)
? userId
: (Guid?)null;
var job = new AutomaticScheduleJob
{
SchedulePlanId = planId,
ActiveSchedulePlanId = planId,
RequestedByUserId = requestedByUserId
};
db.AutomaticScheduleJobs.Add(job);
try
{
await db.SaveChangesAsync(cancellationToken);
}
catch (DbUpdateException)
{
db.Entry(job).State = EntityState.Detached;
existing = await db.AutomaticScheduleJobs.AsNoTracking()
.FirstOrDefaultAsync(
x => x.ActiveSchedulePlanId == planId,
cancellationToken);
if (existing is null) throw;
return AcceptedAtAction(
nameof(GetAutomaticScheduleJob),
new { jobId = existing.Id },
ToResponse(existing));
}
automaticScheduleJobQueue.Enqueue(job.Id);
return AcceptedAtAction(
nameof(GetAutomaticScheduleJob),
new { jobId = job.Id },
ToResponse(job));
}
[HttpGet("auto-schedule-jobs/{jobId:guid}")]
public async Task<ActionResult<AutomaticScheduleJobResponse>>
GetAutomaticScheduleJob(
Guid jobId,
CancellationToken cancellationToken)
{
var job = await db.AutomaticScheduleJobs.AsNoTracking()
.FirstOrDefaultAsync(x => x.Id == jobId, cancellationToken);
return job is null ? NotFound() : Ok(ToResponse(job));
}
[HttpGet("plans/{planId:guid}/auto-schedule-job")]
public async Task<ActionResult<AutomaticScheduleJobResponse?>>
GetActiveAutomaticScheduleJob(
Guid planId,
CancellationToken cancellationToken)
{
var job = await db.AutomaticScheduleJobs.AsNoTracking()
.Where(x => x.ActiveSchedulePlanId == 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,
Guid entryId,
ScheduleEntryRequest request,
CancellationToken cancellationToken)
{
if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
return AutomaticScheduleRunningProblem();
var plan = await DraftPlanAsync(planId, cancellationToken);
if (plan is null) return NotFound();
var entry = await db.ScheduleEntries
.FirstOrDefaultAsync(
x => x.Id == entryId && x.SchedulePlanId == planId,
cancellationToken);
if (entry is null) return NotFound();
var validation = await ValidateEntryAsync(plan, entryId, request, cancellationToken);
if (validation is not null) return validation;
entry.TeachingTaskId = request.TeachingTaskId;
entry.ClassroomId = request.ClassroomId;
entry.DayOfWeek = request.DayOfWeek;
entry.StartPeriod = request.StartPeriod;
entry.PeriodCount = request.PeriodCount;
entry.StartWeek = request.StartWeek;
entry.EndWeek = request.EndWeek;
entry.WeekPattern = request.WeekPattern;
entry.Notes = Normalize(request.Notes);
return await SaveAsync(entryId, false, cancellationToken);
}
[HttpDelete("plans/{planId:guid}/entries/{entryId:guid}")]
public async Task<ActionResult> DeleteEntry(
Guid planId,
Guid entryId,
CancellationToken cancellationToken)
{
if (await HasActiveAutomaticScheduleJobAsync(planId, cancellationToken))
return AutomaticScheduleRunningProblem();
if (await DraftPlanAsync(planId, cancellationToken) is null) return NotFound();
var entry = await db.ScheduleEntries
.FirstOrDefaultAsync(
x => x.Id == entryId && x.SchedulePlanId == planId,
cancellationToken);
if (entry is null) return NotFound();
db.ScheduleEntries.Remove(entry);
return await SaveAsync(entryId, false, cancellationToken);
}
private async Task<SchedulePlan?> DraftPlanAsync(
Guid id,
CancellationToken cancellationToken) =>
await db.SchedulePlans.FirstOrDefaultAsync(
x => x.Id == id && x.Status == SchedulePlanStatus.Draft,
cancellationToken);
private Task<bool> HasActiveAutomaticScheduleJobAsync(
Guid planId,
CancellationToken cancellationToken) =>
db.AutomaticScheduleJobs.AsNoTracking().AnyAsync(
x => x.ActiveSchedulePlanId == planId,
cancellationToken);
private async Task<ActionResult?> ValidateEntryAsync(
SchedulePlan plan,
Guid? entryId,
ScheduleEntryRequest request,
CancellationToken cancellationToken)
{
if (request.StartWeek > request.EndWeek)
return ValidationProblem("开始周不能晚于结束周。");
var activePeriods = await db.ScheduleTimeSlots.AsNoTracking()
.Where(x => x.AcademicTermId == plan.AcademicTermId && x.IsEnabled)
.Select(x => x.PeriodNumber)
.ToListAsync(cancellationToken);
if (activePeriods.Count == 0)
return ValidationProblem("请先维护该学期的上课时间表。");
if (Enumerable.Range(request.StartPeriod, request.PeriodCount)
.Any(period => !activePeriods.Contains(period)))
return ValidationProblem("所选节次包含未启用或不存在的上课时间。");
var task = await db.TeachingTasks.AsNoTracking()
.Include(x => x.Teachers)
.Include(x => x.Classes)
.ThenInclude(x => x.AdministrativeClass)
.ThenInclude(x => x!.Students)
.FirstOrDefaultAsync(x => x.Id == request.TeachingTaskId, cancellationToken);
if (task is null ||
task.Status != TeachingTaskStatus.Published ||
task.AcademicTermId != plan.AcademicTermId)
return ValidationProblem("只能安排同一学期内已发布的教学任务。");
if (task.SchedulingMode == TeachingTaskSchedulingMode.Flexible)
return ValidationProblem("非排时课程不进入正常课表,无需设置星期、节次或教室。");
if (request.StartWeek < task.StartWeek || request.EndWeek > task.EndWeek)
return ValidationProblem("排课周次必须位于教学任务的授课周次内。");
var constraint = await db.TeachingTaskScheduleConstraints.AsNoTracking()
.Include(x => x.AllowedClassrooms)
.FirstOrDefaultAsync(
x => x.TeachingTaskId == request.TeachingTaskId,
cancellationToken);
var requiresClassroom = constraint?.RequiresClassroom ?? true;
if (requiresClassroom && !request.ClassroomId.HasValue)
return ValidationProblem("该课程需要占用教室,请选择教室。");
if (!requiresClassroom && request.ClassroomId.HasValue)
return ValidationProblem("该课程已设置为不占用教室,请清空教室。");
var allowedDays = ParseDays(constraint?.AllowedDayOfWeeks);
if (allowedDays.Count > 0 && !allowedDays.Contains(request.DayOfWeek))
return ValidationProblem("所选星期不在该教学任务允许的上课日内。");
if (constraint?.EarliestPeriod is int earliest &&
request.StartPeriod < earliest)
return ValidationProblem($"该教学任务最早只能从第 {earliest} 节开始。");
if (constraint?.LatestPeriod is int latest &&
request.StartPeriod + request.PeriodCount - 1 > latest)
return ValidationProblem($"该教学任务最晚必须在第 {latest} 节结束。");
Classroom? classroom = null;
if (request.ClassroomId.HasValue)
{
classroom = await db.Classrooms.AsNoTracking()
.Include(x => x.Building)
.FirstOrDefaultAsync(
x => x.Id == request.ClassroomId && x.IsEnabled,
cancellationToken);
if (classroom is null) return ValidationProblem("所选教室不存在或已停用。");
if (constraint?.RequiredCampusId is Guid campusId &&
classroom.Building!.CampusId != campusId)
return ValidationProblem("所选教室不在该课程指定的校区。");
if (constraint?.RequiredBuildingId is Guid buildingId &&
classroom.BuildingId != buildingId)
return ValidationProblem("所选教室不在该课程指定的教学楼。");
var allowedClassroomIds = constraint?.AllowedClassrooms
.Select(x => x.ClassroomId)
.ToHashSet() ?? [];
if (allowedClassroomIds.Count > 0 &&
!allowedClassroomIds.Contains(classroom.Id))
return ValidationProblem("所选教室不在该课程指定的教室范围内。");
}
var studentCount = task.Classes.Sum(x =>
x.AdministrativeClass!.Students.Count(student =>
student.Status == StudentStatus.Active));
var requiredCapacity = Math.Max(task.Capacity, studentCount);
if (classroom is not null && requiredCapacity > classroom.Capacity)
return ConflictProblem(
$"教室容量不足:教学任务容量为 {requiredCapacity} 人,教室仅容纳 {classroom.Capacity} 人。");
var candidates = await db.ScheduleEntries.AsNoTracking()
.Where(x =>
x.SchedulePlanId == plan.Id &&
x.Id != entryId &&
x.DayOfWeek == request.DayOfWeek &&
x.StartWeek <= request.EndWeek &&
x.EndWeek >= request.StartWeek &&
x.StartPeriod < request.StartPeriod + request.PeriodCount &&
request.StartPeriod < x.StartPeriod + x.PeriodCount)
.Include(x => x.TeachingTask)
.ThenInclude(x => x!.Teachers)
.Include(x => x.TeachingTask)
.ThenInclude(x => x!.Classes)
.ToListAsync(cancellationToken);
var proposed = CreateEntryEntity(plan.Id, request);
proposed.TeachingTask = task;
foreach (var candidate in candidates)
{
if (!ScheduleConflictDetector.TimeOverlaps(candidate, proposed)) continue;
var reason = ScheduleConflictDetector.ConflictReason(candidate, proposed);
if (reason is not null)
return ConflictProblem(
$"与“{candidate.TeachingTask!.Name}”发生{reason}冲突。");
}
return null;
}
private static ScheduleEntry CreateEntryEntity(Guid planId, ScheduleEntryRequest request) =>
new()
{
SchedulePlanId = planId,
TeachingTaskId = request.TeachingTaskId,
ClassroomId = request.ClassroomId,
DayOfWeek = request.DayOfWeek,
StartPeriod = request.StartPeriod,
PeriodCount = request.PeriodCount,
StartWeek = request.StartWeek,
EndWeek = request.EndWeek,
WeekPattern = request.WeekPattern,
Notes = Normalize(request.Notes)
};
private static HashSet<int> ParseDays(string? value) =>
string.IsNullOrWhiteSpace(value)
? []
: value.Split(',', StringSplitOptions.RemoveEmptyEntries)
.Select(int.Parse)
.ToHashSet();
private async Task<ActionResult> SaveAsync(
Guid id,
bool created,
CancellationToken cancellationToken)
{
try
{
await db.SaveChangesAsync(cancellationToken);
return created ? Created(string.Empty, new { id }) : NoContent();
}
catch (DbUpdateException)
{
return ConflictProblem("排课版本重复,或关联数据已失效。");
}
}
private ActionResult ConflictProblem(string detail) =>
Conflict(new ProblemDetails
{
Title = "排课冲突",
Detail = detail,
Status = StatusCodes.Status409Conflict
});
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 static AutomaticScheduleJobResponse ToResponse(AutomaticScheduleJob job)
{
IReadOnlyList<string> messages = [];
if (!string.IsNullOrWhiteSpace(job.MessagesJson))
{
messages = JsonSerializer.Deserialize<string[]>(job.MessagesJson) ?? [];
}
return new(
job.Id,
job.SchedulePlanId,
job.Status,
job.TotalTasks,
job.ProcessedTasks,
job.CreatedEntries,
job.CompletedTasks,
messages,
job.ErrorMessage,
job.CreatedAt,
job.StartedAt,
job.CompletedAt);
}
private static string? Normalize(string? value) =>
string.IsNullOrWhiteSpace(value) ? null : value.Trim();
}
public sealed record SchedulePlanRequest(
Guid AcademicTermId,
[Required, MaxLength(120)] string Name,
[Required, MaxLength(30)] string Version,
[MaxLength(500)] string? Notes);
public sealed record CloneSchedulePlanRequest(
[Required, MaxLength(120)] string Name,
[Required, MaxLength(30)] string Version);
public sealed record ScheduleEntryRequest(
Guid TeachingTaskId,
Guid? ClassroomId,
[Range(1, 7)] int DayOfWeek,
[Range(1, 30)] int StartPeriod,
[Range(1, 6)] int PeriodCount,
[Range(1, 30)] int StartWeek,
[Range(1, 30)] int EndWeek,
WeekPattern WeekPattern,
[MaxLength(500)] string? Notes);
public sealed record AutomaticScheduleJobResponse(
Guid Id,
Guid SchedulePlanId,
AutomaticScheduleJobStatus Status,
int TotalTasks,
int ProcessedTasks,
int CreatedEntries,
int CompletedTasks,
IReadOnlyList<string> Messages,
string? ErrorMessage,
DateTime CreatedAt,
DateTime? StartedAt,
DateTime? CompletedAt);