添加项目文件。

Models/ResultResponse.cs

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+using MessagePack;
+
+namespace WebAppServer1.Models
+{
+    [MessagePackObject]
+    public class SearchFriendsResultResponse
+    {
+        [Key("success")]
+        public bool success { get; set; }
+        [Key("username")]
+        public string username { get; set; }
+        [Key("userid")]
+        public int userid { get; set; }
+    };
+}

Models/Tokens.cs

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+namespace WebAppServer1.Models
+{
+    public class Tokens
+    {
+        public int Id { get; set; }
+        public required string RefreshToken { get; set; }
+        public int UserId { get; set; }
+        public required string UserName { get; set; }
+        public DateTime IssuedAt { get; set; }
+        public DateTime ExpiresAt { get; set; }
+        public bool IsRevoked { get; set; }
+    }
+}

Models/Users.cs

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+using MessagePack;
+
+namespace WebAppServer1.Models
+{
+    // 用户表
+    public class User
+    {
+        public int Id { get; set; }
+        public string Username { get; set; } = string.Empty;
+        public string Nickname { get; set; } = string.Empty; // 可修改，不唯一
+        public string Email { get; set; } = string.Empty;
+        public string PasswordHash { get; set; } = string.Empty;
+        public string AvatarUrl { get; set; } = string.Empty;
+        public string Signature { get; set; } = string.Empty;
+        public DateTime LastActive { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public bool IsOnline { get; set; }
+
+        public ICollection<Friend> Friends { get; set; } = new List<Friend>();
+        public ICollection<Message> Messages { get; set; } = new List<Message>();
+    }
+
+    // 好友关系表
+    public class Friend
+    {
+        public int Id { get; set; }
+        public int UserId { get; set; }
+        public int FriendId { get; set; }
+        public FriendStatus Status { get; set; }
+        public DateTime CreatedAt { get; set; }
+
+        public User User { get; set; }
+        public User FriendUser { get; set; }
+    }
+
+    public enum FriendStatus
+    {
+        Pending,
+        Accepted,
+        Blocked
+    }
+
+    // 群聊表
+    public class Group
+    {
+        public int Id { get; set; }
+        public string Name { get; set; } = string.Empty;
+        public int OwnerId { get; set; }
+        public string AvatarUrl { get; set; } = string.Empty;
+        public DateTime CreatedAt { get; set; }
+
+        public User Owner { get; set; }
+        public ICollection<GroupMember> Members { get; set; } = new List<GroupMember>();
+    }
+
+    // 群成员表
+    public class GroupMember
+    {
+        public int Id { get; set; }
+        public int GroupId { get; set; }
+        public int UserId { get; set; }
+        public GroupRole Role { get; set; }
+        public DateTime JoinedAt { get; set; }
+
+        public Group Group { get; set; }
+        public User User { get; set; }
+    }
+
+    public enum GroupRole
+    {
+        Member,
+        Admin,
+        Owner
+    }
+
+    // 消息表
+    public class Message
+    {
+        public int Id { get; set; }
+        public int SenderId { get; set; }
+        public int? ReceiverId { get; set; } // 私聊
+        public int? GroupId { get; set; }    // 群聊
+        public string Content { get; set; } = string.Empty;
+        public MessageType MessageType { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public bool IsRead { get; set; }
+        public bool IsDeleted { get; set; }
+
+        public User Sender { get; set; }
+        public User Receiver { get; set; }
+        public Group Group { get; set; }
+    }
+
+    public enum MessageType
+    {
+        Text,
+        Image,
+        File,
+        Video,
+        Voice
+    }
+
+    // 通知表
+    public class Notification
+    {
+        public int Id { get; set; }
+        public int UserId { get; set; }
+        public NotificationType Type { get; set; }
+        public string Content { get; set; } = string.Empty;
+        public bool IsRead { get; set; }
+        public DateTime CreatedAt { get; set; }
+
+        public User User { get; set; }
+    }
+
+    public enum NotificationType
+    {
+        FriendRequest,
+        Message,
+        System
+    }
+
+    // 文件表
+    public class FileEntity
+    {
+        public int Id { get; set; }
+        public int UploaderId { get; set; }
+        public int MessageId { get; set; }
+        public string FileUrl { get; set; } = string.Empty;
+        public FileType FileType { get; set; }
+        public int Size { get; set; }
+        public DateTime UploadedAt { get; set; }
+
+        public User Uploader { get; set; }
+        public Message Message { get; set; }
+    }
+
+    public enum FileType
+    {
+        Image,
+        Video,
+        Document,
+        Audio
+    }
+
+    public class UserProfileHistory
+    {
+        public int Id { get; set; }
+        public int UserId { get; set; }
+        public string FieldName { get; set; } = string.Empty;
+        public string OldValue { get; set; } = string.Empty;
+        public string NewValue { get; set; } = string.Empty;
+        public DateTime ChangedAt { get; set; }
+        public string ChangedBy { get; set; } = string.Empty;
+
+        public User User { get; set; }
+    }
+
+    public class LoginRecord
+    {
+        public int Id { get; set; }
+        public int UserId { get; set; }
+        public DateTime LoginTime { get; set; }
+        public string IpAddress { get; set; } = string.Empty;
+        public string DeviceInfo { get; set; } = string.Empty;
+        public bool IsSuccess { get; set; }
+
+        public User User { get; set; }
+    }
+
+
+
+}
+