diff --git a/db/models/sc_price_history.go b/db/models/sc_price_history.go
index 998b186..2c2e9e0 100644
--- a/db/models/sc_price_history.go
+++ b/db/models/sc_price_history.go
@@ -18,7 +18,7 @@ func init() {
 type SCPriceHistory struct {
 	gorm.Model
 	CreatedAt time.Time       `gorm:"index:idx_rate"`
-	Rate      decimal.Decimal `gorm:"type:DECIMAL(10,6);index:idx_rate"`
+	Rate      decimal.Decimal `gorm:"type:DECIMAL(10,20);index:idx_rate"`
 }
 
 func (SCPriceHistory) TableName() string {