初始化

FutureMailAPI/Models/SentMail.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FutureMailAPI.Models
+{
+    public class SentMail
+    {
+        [Key]
+        public int Id { get; set; }
+        
+        [Required]
+        [MaxLength(200)]
+        public string Title { get; set; } = string.Empty;
+        
+        [Required]
+        public string Content { get; set; } = string.Empty;
+        
+        [Required]
+        public int SenderId { get; set; }
+        
+        // 收件人类型: 0-自己, 1-指定用户, 2-公开时间胶囊
+        [Required]
+        public int RecipientType { get; set; }
+        
+        // 如果是指定用户，存储用户ID
+        public int? RecipientId { get; set; }
+        
+        // 发送时间
+        public DateTime SentAt { get; set; } = DateTime.UtcNow;
+        
+        // 投递时间
+        [Required]
+        public DateTime DeliveryTime { get; set; }
+        
+        // 邮件状态: 0-草稿, 1-已发送(待投递), 2-投递中, 3-已送达
+        [Required]
+        public int Status { get; set; } = 0;
+        
+        // 触发条件类型: 0-时间, 1-地点, 2-事件
+        [Required]
+        public int TriggerType { get; set; } = 0;
+        
+        // 触发条件详情(JSON格式存储)
+        public string? TriggerDetails { get; set; }
+        
+        // 附件路径(JSON数组格式)
+        public string? Attachments { get; set; }
+        
+        // 是否加密
+        public bool IsEncrypted { get; set; } = false;
+        
+        // 加密密钥(如果使用端到端加密)
+        public string? EncryptionKey { get; set; }
+        
+        // 邮件主题/胶囊皮肤
+        [MaxLength(50)]
+        public string? Theme { get; set; }
+        
+        // 导航属性
+        [ForeignKey("SenderId")]
+        public virtual User Sender { get; set; } = null!;
+        
+        public virtual User? Recipient { get; set; }
+    }
+}