Refactor subscription retrieval logic to limit results to the most recent active subscription. Updated query execution to return the first scalar result for improved performance.

db/dal/subscription_dal.py

@@ -14,13 +14,15 @@ async def get_active_subscription_by_user_id(
         user_id: int,
         panel_user_uuid: Optional[str] = None) -> Optional[Subscription]:
     stmt = select(Subscription).where(
-        Subscription.user_id == user_id, Subscription.is_active == True,
-        Subscription.end_date > datetime.now(timezone.utc))
+        Subscription.user_id == user_id,
+        Subscription.is_active == True,
+        Subscription.end_date > datetime.now(timezone.utc),
+    )
     if panel_user_uuid:
         stmt = stmt.where(Subscription.panel_user_uuid == panel_user_uuid)
-    stmt = stmt.order_by(Subscription.end_date.desc())
+    stmt = stmt.order_by(Subscription.end_date.desc()).limit(1)
     result = await session.execute(stmt)
-    return result.scalar_one_or_none()
+    return result.scalars().first()
 
 
 async def get_subscription_by_panel_subscription_uuid(