- Add retry_count column to guest_purchases with Alembic migration
- Add expression indexes on metadata_json->>'purchase_token' for all 12
payment provider tables (partial indexes filtered by is_paid/status)
- Implement _find_succeeded_provider_payment() covering all providers:
YooKassa, Heleket, MulenPay, Pal24, Wata, Platega, CloudPayments,
Freekassa, KassaAi, RioPay, SeverPay, and CryptoBot (payload field)
- Add amount verification in _check_and_recover_pending_purchase():
compares provider payment amount with GuestPurchase.amount_kopeks,
skips for CryptoBot (USD conversion imprecision)
- Increment retry_count on each retry attempt in retry_stuck_paid_purchases
and retry_stuck_pending_activation
- Mark purchases as FAILED after 20 retries with admin Telegram alert
via AdminNotificationService (ERRORS category)
Fringg
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