后台完成修复，初始化项目

src/main/java/com/org/flashsalesystem/entity/FlashSale.java

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+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import javax.validation.constraints.DecimalMin;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 秒杀活动实体类
+ * 对应数据库flash_sales表
+ */
+@Entity
+@Table(name = "flash_sales")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class FlashSale {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotNull(message = "商品ID不能为空")
+    @Column(name = "product_id", nullable = false)
+    private Long productId;
+
+    @NotNull(message = "秒杀价格不能为空")
+    @DecimalMin(value = "0.01", message = "秒杀价格必须大于0")
+    @Column(name = "flash_price", nullable = false, precision = 10, scale = 2)
+    private BigDecimal flashPrice;
+
+    @Min(value = 1, message = "秒杀库存必须大于0")
+    @Column(name = "flash_stock", nullable = false)
+    private Integer flashStock;
+
+    @NotNull(message = "开始时间不能为空")
+    @Column(name = "start_time", nullable = false)
+    private LocalDateTime startTime;
+
+    @NotNull(message = "结束时间不能为空")
+    @Column(name = "end_time", nullable = false)
+    private LocalDateTime endTime;
+
+    /**
+     * 活动状态：1-未开始，2-进行中，3-已结束
+     */
+    @Column(nullable = false)
+    private Integer status = 1;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "product_id", insertable = false, updatable = false)
+    private Product product;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+    }
+
+    /**
+     * 检查活动是否已开始
+     */
+    public boolean isStarted() {
+        return LocalDateTime.now().isAfter(startTime);
+    }
+
+    /**
+     * 检查活动是否已结束
+     */
+    public boolean isEnded() {
+        return LocalDateTime.now().isAfter(endTime);
+    }
+
+    /**
+     * 检查活动是否正在进行中
+     */
+    public boolean isActive() {
+        LocalDateTime now = LocalDateTime.now();
+        return now.isAfter(startTime) && now.isBefore(endTime) && status == 2;
+    }
+}

src/main/java/com/org/flashsalesystem/entity/Order.java

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+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import javax.validation.constraints.DecimalMin;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 订单实体类
+ * 对应数据库orders表
+ */
+@Entity
+@Table(name = "orders")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Order {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotNull(message = "用户ID不能为空")
+    @Column(name = "user_id", nullable = false)
+    private Long userId;
+
+    @NotNull(message = "商品ID不能为空")
+    @Column(name = "product_id", nullable = false)
+    private Long productId;
+
+    @Min(value = 1, message = "商品数量必须大于0")
+    @Column(nullable = false)
+    private Integer quantity;
+
+    @NotNull(message = "订单总价不能为空")
+    @DecimalMin(value = "0.01", message = "订单总价必须大于0")
+    @Column(name = "total_price", nullable = false, precision = 10, scale = 2)
+    private BigDecimal totalPrice;
+
+    /**
+     * 订单状态：1-待支付，2-已支付，3-已发货，4-已完成，5-已取消
+     */
+    @Column(nullable = false)
+    private Integer status = 1;
+
+    /**
+     * 订单类型：1-普通订单，2-秒杀订单
+     */
+    @Column(name = "order_type", nullable = false)
+    private Integer orderType = 1;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", insertable = false, updatable = false)
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "product_id", insertable = false, updatable = false)
+    private Product product;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+
+    /**
+     * 订单状态枚举
+     */
+    public enum OrderStatus {
+        PENDING_PAYMENT(1, "待支付"),
+        PAID(2, "已支付"),
+        SHIPPED(3, "已发货"),
+        COMPLETED(4, "已完成"),
+        CANCELLED(5, "已取消");
+
+        private final int code;
+        private final String description;
+
+        OrderStatus(int code, String description) {
+            this.code = code;
+            this.description = description;
+        }
+
+        public int getCode() {
+            return code;
+        }
+
+        public String getDescription() {
+            return description;
+        }
+    }
+
+    /**
+     * 订单类型枚举
+     */
+    public enum OrderType {
+        NORMAL(1, "普通订单"),
+        FLASH_SALE(2, "秒杀订单");
+
+        private final int code;
+        private final String description;
+
+        OrderType(int code, String description) {
+            this.code = code;
+            this.description = description;
+        }
+
+        public int getCode() {
+            return code;
+        }
+
+        public String getDescription() {
+            return description;
+        }
+    }
+}

src/main/java/com/org/flashsalesystem/entity/Product.java

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+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import javax.validation.constraints.DecimalMin;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 商品实体类
+ * 对应数据库products表
+ */
+@Entity
+@Table(name = "products")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Product {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank(message = "商品名称不能为空")
+    @Column(nullable = false, length = 200)
+    private String name;
+
+    @Column(columnDefinition = "TEXT")
+    private String description;
+
+    @NotNull(message = "商品价格不能为空")
+    @DecimalMin(value = "0.01", message = "商品价格必须大于0")
+    @Column(nullable = false, precision = 10, scale = 2)
+    private BigDecimal price;
+
+    @Min(value = 0, message = "库存不能为负数")
+    @Column(nullable = false)
+    private Integer stock = 0;
+
+    @Column(name = "image_url", length = 500)
+    private String imageUrl;
+
+    /**
+     * 商品状态：1-上架，0-下架
+     */
+    @Column(nullable = false)
+    private Integer status = 1;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+}

src/main/java/com/org/flashsalesystem/entity/User.java

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+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+import java.time.LocalDateTime;
+
+/**
+ * 用户实体类
+ * 对应数据库users表
+ */
+@Entity
+@Table(name = "users")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank(message = "用户名不能为空")
+    @Size(min = 3, max = 50, message = "用户名长度必须在3-50个字符之间")
+    @Column(unique = true, nullable = false, length = 50)
+    private String username;
+
+    @NotBlank(message = "密码不能为空")
+    @Size(min = 6, max = 100, message = "密码长度必须在6-100个字符之间")
+    @Column(nullable = false, length = 100)
+    private String password;
+
+    @Email(message = "邮箱格式不正确")
+    @Column(length = 100)
+    private String email;
+
+    @Size(max = 20, message = "手机号长度不能超过20个字符")
+    @Column(length = 20)
+    private String phone;
+
+    @Column(name = "status", nullable = false)
+    private Integer status = 1; // 1-正常, 0-禁用
+
+    @Column(name = "last_login")
+    private LocalDateTime lastLogin;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+}