diff --git a/model/topup.go b/model/topup.go
index 00ad5c49..d1b0c5cb 100644
--- a/model/topup.go
+++ b/model/topup.go
@@ -110,6 +110,14 @@ func Recharge(referenceId string, customerId string, callerIp string) (err error
 	return nil
 }
 
+// topUpQueryWindowSeconds 限制充值记录查询的时间窗口（秒）。
+const topUpQueryWindowSeconds int64 = 30 * 24 * 60 * 60
+
+// topUpQueryCutoff 返回允许查询的最早 create_time（秒级 Unix 时间戳）。
+func topUpQueryCutoff() int64 {
+	return common.GetTimestamp() - topUpQueryWindowSeconds
+}
+
 func GetUserTopUps(userId int, pageInfo *common.PageInfo) (topups []*TopUp, total int64, err error) {
 	// Start transaction
 	tx := DB.Begin()
@@ -122,15 +130,17 @@ func GetUserTopUps(userId int, pageInfo *common.PageInfo) (topups []*TopUp, tota
 		}
 	}()
 
+	cutoff := topUpQueryCutoff()
+
 	// Get total count within transaction
-	err = tx.Model(&TopUp{}).Where("user_id = ?", userId).Count(&total).Error
+	err = tx.Model(&TopUp{}).Where("user_id = ? AND create_time >= ?", userId, cutoff).Count(&total).Error
 	if err != nil {
 		tx.Rollback()
 		return nil, 0, err
 	}
 
 	// Get paginated topups within same transaction
-	err = tx.Where("user_id = ?", userId).Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error
+	err = tx.Where("user_id = ? AND create_time >= ?", userId, cutoff).Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error
 	if err != nil {
 		tx.Rollback()
 		return nil, 0, err
@@ -144,7 +154,7 @@ func GetUserTopUps(userId int, pageInfo *common.PageInfo) (topups []*TopUp, tota
 	return topups, total, nil
 }
 
-// GetAllTopUps 获取全平台的充值记录（管理员使用）
+// GetAllTopUps 获取全平台的充值记录（管理员使用，不限制时间窗口）
 func GetAllTopUps(pageInfo *common.PageInfo) (topups []*TopUp, total int64, err error) {
 	tx := DB.Begin()
 	if tx.Error != nil {
@@ -173,6 +183,10 @@ func GetAllTopUps(pageInfo *common.PageInfo) (topups []*TopUp, total int64, err
 	return topups, total, nil
 }
 
+// searchTopUpCountHardLimit 搜索充值记录时 COUNT 的安全上限，
+// 防止对超大表执行无界 COUNT 触发 DoS。
+const searchTopUpCountHardLimit = 10000
+
 // SearchUserTopUps 按订单号搜索某用户的充值记录
 func SearchUserTopUps(userId int, keyword string, pageInfo *common.PageInfo) (topups []*TopUp, total int64, err error) {
 	tx := DB.Begin()
@@ -185,20 +199,26 @@ func SearchUserTopUps(userId int, keyword string, pageInfo *common.PageInfo) (to
 		}
 	}()
 
-	query := tx.Model(&TopUp{}).Where("user_id = ?", userId)
+	query := tx.Model(&TopUp{}).Where("user_id = ? AND create_time >= ?", userId, topUpQueryCutoff())
 	if keyword != "" {
-		like := "%%" + keyword + "%%"
-		query = query.Where("trade_no LIKE ?", like)
+		pattern, perr := sanitizeLikePattern(keyword)
+		if perr != nil {
+			tx.Rollback()
+			return nil, 0, perr
+		}
+		query = query.Where("trade_no LIKE ? ESCAPE '!'", pattern)
 	}
 
-	if err = query.Count(&total).Error; err != nil {
+	if err = query.Limit(searchTopUpCountHardLimit).Count(&total).Error; err != nil {
 		tx.Rollback()
-		return nil, 0, err
+		common.SysError("failed to count search topups: " + err.Error())
+		return nil, 0, errors.New("搜索充值记录失败")
 	}
 
 	if err = query.Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error; err != nil {
 		tx.Rollback()
-		return nil, 0, err
+		common.SysError("failed to search topups: " + err.Error())
+		return nil, 0, errors.New("搜索充值记录失败")
 	}
 
 	if err = tx.Commit().Error; err != nil {
@@ -207,7 +227,7 @@ func SearchUserTopUps(userId int, keyword string, pageInfo *common.PageInfo) (to
 	return topups, total, nil
 }
 
-// SearchAllTopUps 按订单号搜索全平台充值记录（管理员使用）
+// SearchAllTopUps 按订单号搜索全平台充值记录（管理员使用，不限制时间窗口）
 func SearchAllTopUps(keyword string, pageInfo *common.PageInfo) (topups []*TopUp, total int64, err error) {
 	tx := DB.Begin()
 	if tx.Error != nil {
@@ -221,18 +241,24 @@ func SearchAllTopUps(keyword string, pageInfo *common.PageInfo) (topups []*TopUp
 
 	query := tx.Model(&TopUp{})
 	if keyword != "" {
-		like := "%%" + keyword + "%%"
-		query = query.Where("trade_no LIKE ?", like)
+		pattern, perr := sanitizeLikePattern(keyword)
+		if perr != nil {
+			tx.Rollback()
+			return nil, 0, perr
+		}
+		query = query.Where("trade_no LIKE ? ESCAPE '!'", pattern)
 	}
 
-	if err = query.Count(&total).Error; err != nil {
+	if err = query.Limit(searchTopUpCountHardLimit).Count(&total).Error; err != nil {
 		tx.Rollback()
-		return nil, 0, err
+		common.SysError("failed to count search topups: " + err.Error())
+		return nil, 0, errors.New("搜索充值记录失败")
 	}
 
 	if err = query.Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error; err != nil {
 		tx.Rollback()
-		return nil, 0, err
+		common.SysError("failed to search topups: " + err.Error())
+		return nil, 0, errors.New("搜索充值记录失败")
 	}
 
 	if err = tx.Commit().Error; err != nil {