first commot

Entity/BaseEntity.cs

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+using Yitter.IdGenerator;
+
+namespace Entity;
+
+/// <summary>
+/// 实体基类
+/// </summary>
+public abstract class BaseEntity
+{
+    /// <summary>
+    /// 主键ID (雪花算法有序ID)
+    /// </summary>
+    [Column(IsPrimary = true)]
+    public long Id { get; set; } = YitIdHelper.NextId();
+
+    /// <summary>
+    /// 创建时间
+    /// </summary>
+    public DateTime CreateTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 更新时间
+    /// </summary>
+    public DateTime? UpdateTime { get; set; }
+}

Entity/EmailMessage.cs

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+namespace Entity;
+
+/// <summary>
+/// 邮件消息实体
+/// </summary>
+public class EmailMessage : BaseEntity
+{
+    /// <summary>
+    /// 邮件主题
+    /// </summary>
+    public string Subject { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 邮件发送者
+    /// </summary>
+    public string From { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 邮件正文
+    /// </summary>
+    public string Body { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 邮件HTML内容
+    /// </summary>
+    public string HtmlBody { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 邮件接收时间
+    /// </summary>
+    public DateTime ReceivedDate { get; set; }
+}

Entity/Entity.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <PackageReference Include="FreeSql" />
+    <PackageReference Include="Yitter.IdGenerator" />
+  </ItemGroup>
+</Project>

Entity/GlobalUsings.cs

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+global using FreeSql.DataAnnotations;

Entity/TransactionCategory.cs

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+namespace Entity;
+
+/// <summary>
+/// 交易分类（层级结构：类型 -> 分类 -> 子分类）
+/// </summary>
+public class TransactionCategory : BaseEntity
+{
+    /// <summary>
+    /// 分类名称
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 父分类ID（0表示顶级分类）
+    /// </summary>
+    public long ParentId { get; set; }
+
+    /// <summary>
+    /// 交易类型（支出/收入）
+    /// </summary>
+    public TransactionType Type { get; set; }
+
+    /// <summary>
+    /// 层级（1=类型级, 2=分类级, 3=子分类级）
+    /// </summary>
+    public int Level { get; set; }
+
+    /// <summary>
+    /// 排序号
+    /// </summary>
+    public int SortOrder { get; set; }
+
+    /// <summary>
+    /// 图标（可选）
+    /// </summary>
+    public string? Icon { get; set; }
+
+    /// <summary>
+    /// 是否启用
+    /// </summary>
+    public bool IsEnabled { get; set; } = true;
+
+    /// <summary>
+    /// 备注
+    /// </summary>
+    public string? Remark { get; set; }
+}

Entity/TransactionRecord.cs

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+namespace Entity;
+
+/// <summary>
+/// 银行交易记录（由邮件解析生成）
+/// </summary>
+public class TransactionRecord : BaseEntity
+{
+    /// <summary>
+    /// 卡号或账户标识
+    /// </summary>
+    public string Card { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 交易原因/摘要
+    /// </summary>
+    public string Reason { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 交易金额
+    /// </summary>
+    public decimal Amount { get; set; }
+
+    /// <summary>
+    /// 退款金额
+    /// </summary>
+    public decimal RefundAmount { get; set; }
+
+    /// <summary>
+    /// 交易后余额
+    /// </summary>
+    public decimal Balance { get; set; }
+
+    /// <summary>
+    /// 发生时间（邮件中的交易时间）
+    /// </summary>
+    public DateTime OccurredAt { get; set; }
+
+    /// <summary>
+    /// 原始邮件记录ID
+    /// </summary>
+    public long EmailMessageId { get; set; }
+
+    /// <summary>
+    /// 交易类型
+    /// </summary>
+    public TransactionType Type { get; set; }
+
+    /// <summary>
+    /// 交易分类
+    /// </summary>
+    public string Classify { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 交易子分类
+    /// </summary>
+    public string SubClassify { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 导入编号
+    /// </summary>
+    public string ImportNo { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 导入来源
+    /// </summary>
+    public string ImportFrom { get; set; } = string.Empty;
+}
+
+public enum TransactionType
+{
+    /// <summary>
+    /// 支出
+    /// </summary>
+    Expense = 0,
+
+    /// <summary>
+    /// 收入
+    /// </summary>
+    Income = 1,
+
+    /// <summary>
+    /// 不计入收支
+    /// </summary>
+    None = 2
+}

Entity/WeatherForecast.cs

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+namespace Entity;
+
+/// <summary>
+/// 天气预报实体
+/// </summary>
+public class WeatherForecast : BaseEntity
+{
+    /// <summary>
+    /// 日期
+    /// </summary>
+    public DateOnly Date { get; set; }
+
+    /// <summary>
+    /// 摄氏温度
+    /// </summary>
+    public int TemperatureC { get; set; }
+
+    /// <summary>
+    /// 摄氏度转华氏度
+    /// </summary>
+    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+    /// <summary>
+    /// 天气摘要
+    /// </summary>
+    public string? Summary { get; set; }
+}