feat: implement subscription management and billing enhancements

repositories/subscriptions.py

@@ -72,3 +72,18 @@ class SubscriptionRepository:
         result = await session.execute(stmt)
         await session.commit()
         return result.scalar_one_or_none()
+
+    async def update_subscription_autorenew(
+        self, session: AsyncSession, user_id: int, autorenew: bool
+    ) -> Subscription | None:
+        stmt = (
+            update(Subscription)
+            .where(Subscription.user_id == user_id)
+            .values(
+                autorenew=autorenew,
+            )
+            .returning(Subscription)
+        )
+        result = await session.execute(stmt)
+        await session.commit()
+        return result.scalar_one_or_none()

repositories/users.py

@@ -105,7 +105,7 @@ class UserRepository:
         if not user or user.balance < amount:
             return None
 
-        created_at = datetime.datetime.now(datetime.timezone.UTC)
+        created_at = datetime.datetime.now(datetime.UTC)
         transaction = BalanceTransaction(
             user_id=user_id,
             amount=amount,