chore: fix

backend/gestion/db/db_referral.go

@@ -48,6 +48,17 @@ func (d *Database) DebitReferralBalance(username string, amount float64) error {
 	})
 }
 
+func (d *Database) ResetClientReferralBalance(username string) error {
+	result := d.GDB.Model(&models.Client{}).Where("username = ?", username).Update("referral_balance", 0)
+	if result.Error != nil {
+		return result.Error
+	}
+	if result.RowsAffected == 0 {
+		return fmt.Errorf("client non trouvé")
+	}
+	return nil
+}
+
 func (d *Database) UseClientReferralBalance(tx *gorm.DB, username string, amount float64) error {
 	if amount <= 0 {
 		return nil