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backend/FateMaster.API/Models/SystemConfig.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace FateMaster.API.Models;
+
+/// <summary>
+/// 系统配置表
+/// </summary>
+public class SystemConfig
+{
+    [Key]
+    public int Id { get; set; }
+
+    /// <summary>
+    /// 配置键
+    /// </summary>
+    [Required]
+    [MaxLength(100)]
+    public string ConfigKey { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 配置值
+    /// </summary>
+    [Required]
+    public string ConfigValue { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 描述
+    /// </summary>
+    [MaxLength(500)]
+    public string? Description { get; set; }
+
+    /// <summary>
+    /// 创建时间
+    /// </summary>
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    /// <summary>
+    /// 更新时间
+    /// </summary>
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}