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H1: log error when tariff_id set but tariff relationship not loaded H2: warn on CLASSIC_PERIOD_PRICES→PERIOD_PRICES fallback M1: fix float division in miniapp tariff purchase (use PricingEngine.apply_discount) M2: fix format_period Russian pluralization for teen-hundreds (111-119, etc.) M3: deduplicate _resolve_discount_percent — import from pricing_utils M4: fix N+1 queries in compute_simple_subscription_price (batch fetch) M5: add period_days validation tests (negative, zero, float) M6: add user=None tests for tariff and classic modes M7: fix float division in calculate_prorated_price (use // instead of /) L1: add context to _calculate_servers_price error log L2: add comment clarifying ClassicBreakdown.group_discount_pct type L3: add test for original_total property L4: inline _apply_percentage_discount wrapper in subscription_purchase_service L5: replace global _server_id_counter with itertools.count() in tests