added validation; DB is global now

internal/services/email_service.go

@@ -129,7 +129,7 @@ func (s *EmailService) NotifyAdminOfNewUser(user *models.User) error {
 		City:            user.City,
 		DateOfBirth:     user.DateOfBirth.Format("20060102"),
 		Email:           user.Email,
-		Phone:           *user.Phone,
+		Phone:           user.Phone,
 		IBAN:            user.BankAccount.IBAN,
 	}