chore: refacto

backend/gestion/db/db_referral.go

@@ -2,6 +2,7 @@ package db
 
 import (
 	"fmt"
+	"gestion/models"
 
 	"gorm.io/gorm"
 )
@@ -19,7 +20,9 @@ func (d *Database) CreditClientReferral(username string, amount float64) error {
 	if amount <= 0 {
 		return fmt.Errorf("le montant doit être positif")
 	}
-	result := d.GDB.Exec(`UPDATE clients SET referral_balance = referral_balance + ? WHERE username = ?`, amount, username)
+	result := d.GDB.Model(&models.Client{}).Where("username = ?", username).Updates(map[string]any{
+		"referral_balance": gorm.Expr("referral_balance + ?", amount),
+	})
 	if result.Error != nil {
 		return result.Error
 	}