add:

更新

backend/IM_API/Models/ImContext.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using IM_API.Models.Upload;
 using Microsoft.EntityFrameworkCore;
 
 namespace IM_API.Models;
@@ -18,6 +19,7 @@ public partial class ImContext : DbContext
     public virtual DbSet<Device> Devices { get; set; }
 
     public virtual DbSet<File> Files { get; set; }
+    public virtual DbSet<UploadTask> UploadTasks { get; set; }
 
     public virtual DbSet<Friend> Friends { get; set; }
 
@@ -208,6 +210,17 @@ public partial class ImContext : DbContext
                 .HasConstraintName("files_ibfk_1");
         });
 
+        modelBuilder.Entity<UploadTask>(entity =>
+        {
+            entity.HasKey(e => e.Id).HasName("PRIMARY");
+
+            entity
+                .ToTable("upload_tasks")
+                .HasCharSet("utf8mb4")
+                .UseCollation("utf8mb4_general_ci");
+
+        });
+
         modelBuilder.Entity<Friend>(entity =>
         {
             entity.HasKey(e => e.Id).HasName("PRIMARY");

backend/IM_API/Models/Upload/UploadStatus.cs

@@ -0,0 +1,10 @@
+namespace IM_API.Models.Upload
+{
+    public enum UploadStatus
+    {
+        Created,
+        Uploading,
+        Completed,
+        Aborted
+    }
+}

backend/IM_API/Models/Upload/UploadTask.cs

@@ -0,0 +1,24 @@
+namespace IM_API.Models.Upload
+{
+    public class UploadTask
+    {
+        public Guid Id { get; set; }
+
+        public string FileName { get; set; } = default!;
+        public long FileSize { get; set; }
+        public string FileHash { get; set; }
+        public string ContentType { get; set; } = default!;
+
+        public int ChunkSize { get; set; }
+        public int TotalChunks { get; set; }
+
+        public UploadStatus Status { get; set; }
+
+        public string StorageProvider { get; set; } = default!;
+        public string ObjectName { get; set; } = default!;
+
+        public string? ProviderUploadId { get; set; } // OSS/S3 UploadId
+
+        public DateTimeOffset CreatedAt { get; set; }
+    }
+}