fix: remaining pricing-critical .days floor calculations → math.ceil

Same bug as device pricing: timedelta.days floors partial days.
Fixed 14 more pricing-critical locations across 7 files:

- traffic addon pricing (bot handler + cabinet + miniapp)
- country addon pricing (bot handler + miniapp)
- generic addon pricing helper (common.py)
- auto-purchase device recomputation
- subscription CRUD pricing helper

Display-only .days usages intentionally left as floor (correct for
showing "X days left" to users).

app/cabinet/routes/subscription_modules/traffic.py

@@ -9,6 +9,7 @@ POST /subscription/traffic/save-cart
 
 from __future__ import annotations
 
+import math
 from datetime import UTC, datetime
 from typing import Any
 
@@ -478,7 +479,7 @@ async def save_traffic_cart(
     from app.utils.pricing_utils import calculate_prorated_price as _calc_prorated
 
     now = datetime.now(UTC)
-    days_left = max(1, (subscription.end_date - now).days)
+    days_left = max(1, math.ceil((subscription.end_date - now).total_seconds() / 86400))
     prorated_price, _ = _calc_prorated(
         base_price_kopeks,
         subscription.end_date,

app/database/crud/subscription.py

@@ -1,3 +1,4 @@
+import math
 import secrets
 from collections.abc import Iterable
 from datetime import UTC, datetime, timedelta
@@ -1296,7 +1297,7 @@ async def add_subscription_servers(
 
     if paid_prices is None:
         now = datetime.now(UTC)
-        days_remaining = max(1, (subscription.end_date - now).days)
+        days_remaining = max(1, math.ceil((subscription.end_date - now).total_seconds() / 86400))
         paid_prices = []
 
         from app.database.models import ServerSquad

app/handlers/subscription/common.py

@@ -1,6 +1,7 @@
 import asyncio
 import base64
 import html as html_mod
+import math
 import re
 import time
 from datetime import UTC, datetime
@@ -545,7 +546,7 @@ def get_traffic_switch_keyboard(
     # Считаем по дням (как в кабинете и подтверждении)
     if subscription_end_date:
         now = datetime.now(UTC)
-        days_left = max(1, (subscription_end_date - now).days)
+        days_left = max(1, math.ceil((subscription_end_date - now).total_seconds() / 86400))
         price_multiplier = days_left / 30
         period_text = f' (за {days_left} дн.)' if days_left > 1 else ' (за 1 день)'
     else:

app/handlers/subscription/countries.py

@@ -1,4 +1,5 @@
 import html
+import math
 from datetime import UTC, datetime
 
 from aiogram import types
@@ -266,7 +267,7 @@ async def apply_countries_changes(callback: types.CallbackQuery, db_user: User,
     logger.info('🔧 Добавлено: Удалено', added=added, removed=removed)
 
     now = datetime.now(UTC)
-    days_to_pay = max(1, (subscription.end_date - now).days)
+    days_to_pay = max(1, math.ceil((subscription.end_date - now).total_seconds() / 86400))
 
     period_hint_days = days_to_pay if days_to_pay > 0 else None
 

app/handlers/subscription/traffic.py

@@ -1,3 +1,4 @@
+import math
 from datetime import UTC, datetime
 
 from aiogram import types
@@ -807,7 +808,7 @@ async def confirm_switch_traffic(
     new_price_per_month = settings.get_traffic_price(new_traffic_gb)
 
     now = datetime.now(UTC)
-    days_remaining = max(1, (subscription.end_date - now).days)
+    days_remaining = max(1, math.ceil((subscription.end_date - now).total_seconds() / 86400))
     period_hint_days = days_remaining if days_remaining > 0 else None
     traffic_discount_percent = PricingEngine.get_addon_discount_percent(
         db_user,
@@ -911,7 +912,7 @@ async def execute_switch_traffic(
     base_traffic = current_traffic - purchased_traffic
     old_price_per_month = settings.get_traffic_price(base_traffic)
     new_price_per_month = settings.get_traffic_price(new_traffic_gb)
-    days_remaining = max(1, (subscription.end_date - datetime.now(UTC)).days)
+    days_remaining = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
     traffic_discount_percent = PricingEngine.get_addon_discount_percent(
         db_user,
         'traffic',
@@ -936,7 +937,7 @@ async def execute_switch_traffic(
                 await callback.answer('⚠️ Ошибка списания средств', show_alert=True)
                 return
 
-            days_remaining = max(1, (subscription.end_date - datetime.now(UTC)).days)
+            days_remaining = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
             await create_transaction(
                 db=db,
                 user_id=db_user.id,

app/services/subscription_auto_purchase_service.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import html
+import math
 from dataclasses import dataclass
 from datetime import UTC, datetime, timedelta
 
@@ -1533,7 +1534,7 @@ async def _auto_add_devices(
 
     # Recompute price fresh under lock (pricing config may have changed since cart was saved)
     devices_price_per_month = devices_to_add * tariff_device_price
-    days_left = max(1, (subscription.end_date - datetime.now(UTC)).days)
+    days_left = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
     devices_discount_percent = PricingEngine.get_addon_discount_percent(
         user,
         'devices',

app/webapi/routes/miniapp.py

@@ -5755,7 +5755,7 @@ async def update_subscription_servers_endpoint(
             subscription.end_date,
         )
     else:
-        charged_days = max(1, (subscription.end_date - datetime.now(UTC)).days)
+        charged_days = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
 
     added_server_ids = [catalog[uuid].get('server_id') for uuid in added if catalog[uuid].get('server_id') is not None]
     added_server_prices = [
@@ -5933,7 +5933,7 @@ async def update_subscription_traffic_endpoint(
             },
         )
 
-    days_remaining = max(1, (subscription.end_date - datetime.now(UTC)).days)
+    days_remaining = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
     period_hint_days = days_remaining
 
     # Lock user BEFORE discount computation to prevent TOCTOU on promo group
@@ -6111,7 +6111,7 @@ async def update_subscription_devices_endpoint(
         chargeable_diff = new_chargeable - current_chargeable
 
         price_per_month = chargeable_diff * tariff_device_price
-        days_remaining = max(1, (subscription.end_date - datetime.now(UTC)).days)
+        days_remaining = max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))
         period_hint_days = days_remaining
 
         # Lock user BEFORE price computation to prevent TOCTOU on promo discount
@@ -6159,7 +6159,7 @@ async def update_subscription_devices_endpoint(
             user_id=user.id,
             type=TransactionType.SUBSCRIPTION_PAYMENT,
             amount_kopeks=price_to_charge,
-            description=f'{description} за {charged_days or max(1, (subscription.end_date - datetime.now(UTC)).days)} дн.',
+            description=f'{description} за {charged_days or max(1, math.ceil((subscription.end_date - datetime.now(UTC)).total_seconds() / 86400))} дн.',
         )
 
     if price_to_charge > 0: