TASK: 推广码 添加开始生效时间;优化数据计算类型，使用BigDecimal替换float;更新paidCommission后自动计算unpaidCommission

src/main/java/com/ai/da/mapper/primary/entity/ProductCoupons.java

@@ -7,6 +7,8 @@ import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.NoArgsConstructor;
 
+import java.math.BigDecimal;
+
 @EqualsAndHashCode(callSuper = true)
 @Data
 @TableName("t_product_coupons")
@@ -20,6 +22,8 @@ public class ProductCoupons extends BaseEntity{
     private String promotionCodeId;
     // 对应的推广码
     private String promotionCode;
+    // 优惠券有效期开始时间
+    private Long startTime;
     // 最大兑换次数
     private Long maxRedemptions;
     // 优惠券的折扣
@@ -29,13 +33,13 @@ public class ProductCoupons extends BaseEntity{
     // 合作者
     private String cooperator;
     // 使用了该优惠券支付的总金额
-    private float totalEarnings;
+    private BigDecimal  totalEarnings = BigDecimal.ZERO;
     // 佣金
-    private float commission;
+    private BigDecimal commission = BigDecimal.ZERO;
     // 已付佣金
-    private float paidCommission;
+    private BigDecimal  paidCommission = BigDecimal.ZERO;
     // 未付佣金
-    private float unpaidCommission;
+    private BigDecimal  unpaidCommission = BigDecimal.ZERO;
     // 备注
     private String remark;