bugfix：支付

internal/service/adreward.go

@@ -41,6 +41,12 @@ func (s *AdRewardService) Grant(ctx context.Context, userID int64, request *dto.
 		return nil, errcode.AdRewardInvalid.WithDetails("该激励类型未配置发放数量")
 	}
 
+	// 变更前后取「有效剩余」，仅用于流水展示；权威数值以额度凭证表为准。
+	before := int64(0)
+	if eff, qerr := getEffectiveQuota(ctx, userID, quotaType); qerr == nil {
+		before = eff.Remain
+	}
+
 	grant := &mysqlmodel.QuotaGrant{
 		UserID:     userID,
 		QuotaType:  quotaType,
@@ -50,12 +56,26 @@ func (s *AdRewardService) Grant(ctx context.Context, userID int64, request *dto.
 		ExpireTime: todayEndUnix(), // 当天 23:59:59 到期
 		RefID:      request.RefID,
 	}
-	if err := mysqldao.NewQuotaGrantDao().QuotaGrantCreate(ctx, grant); err != nil {
-		if isDuplicateKey(err) {
-			return nil, errcode.AdRewardClaimed
-		}
+	// 流水 order_no 复用广告记录ID（与凭证 ref_id 一致，便于回溯；非空故不影响唯一索引幂等）。
+	flow := &mysqlmodel.QuotaFlowLog{
+		QuotaFlowUUID: genUUID(),
+		UserID:        userID,
+		ChangeTarget:  QuotaChangeTargetAdjust,
+		ChangeType:    QuotaChangeTypeActivity,
+		ChangeNum:     amount,
+		OldValue:      before,
+		NewValue:      before + amount,
+		OrderNo:       request.RefID,
+		QuotaType:     quotaType,
+		Reason:        "广告激励赠送",
+	}
+	created, err := mysqldao.NewQuotaGrantDao().QuotaGrantCreateWithFlow(ctx, grant, flow)
+	if err != nil {
 		return nil, errcode.DatabaseError
 	}
+	if !created {
+		return nil, errcode.AdRewardClaimed // 凭证已存在：重复领取。
+	}
 
 	return &dto.AdRewardGrantResponse{
 		RefID:     request.RefID,