username filtration

bot/services/tribute_service.py

@@ -16,6 +16,7 @@ from bot.services.referral_service import ReferralService
 from .notification_service import NotificationService
 from bot.keyboards.inline.user_keyboards import get_connect_and_main_keyboard
 from db.dal import payment_dal, user_dal, subscription_dal
+from bot.utils.text_sanitizer import sanitize_display_name, username_for_display
 
 
 def convert_period_to_months(period: Optional[str]) -> int:
@@ -184,10 +185,12 @@ class TributeService:
                         inviter_name_display = _('friend_placeholder')
                         if db_user and db_user.referred_by_id:
                             inviter = await user_dal.get_user_by_id(session, db_user.referred_by_id)
-                            if inviter and inviter.first_name:
-                                inviter_name_display = inviter.first_name
-                            elif inviter and inviter.username:
-                                inviter_name_display = f"@{inviter.username}"
+                            if inviter:
+                                safe_name = sanitize_display_name(inviter.first_name) if inviter.first_name else None
+                                if safe_name:
+                                    inviter_name_display = safe_name
+                                elif inviter.username:
+                                    inviter_name_display = username_for_display(inviter.username, with_at=False)
                         success_msg = _(
                             "payment_successful_with_referral_bonus_full",
                             months=months,