Add ProfileSyncMiddleware to keep user profile data updated in the database

- Integrated ProfileSyncMiddleware to ensure that user profile information (username, first_name, last_name) remains current in the database.
- Updated get_enhanced_user_statistics to use timezone-aware datetime for accurate SQL queries, preventing naive/aware comparison issues.
- Clarified comments in the user statistics function for better understanding of active user metrics and subscription handling.

db/dal/user_dal.py

@@ -93,9 +93,10 @@ async def get_all_users_with_panel_uuid(session: AsyncSession) -> List[User]:
 
 async def get_enhanced_user_statistics(session: AsyncSession) -> Dict[str, Any]:
     """Get comprehensive user statistics including active users, trial users, etc."""
-    from datetime import datetime, timedelta
+    from datetime import datetime, timezone
     
-    now = datetime.utcnow()
+    # Use timezone-aware UTC to avoid naive/aware comparison issues in SQL queries
+    now = datetime.now(timezone.utc)
     today_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
     
     # Total users
@@ -106,13 +107,11 @@ async def get_enhanced_user_statistics(session: AsyncSession) -> Dict[str, Any]:
     banned_users_stmt = select(func.count(User.user_id)).where(User.is_banned == True)
     banned_users = (await session.execute(banned_users_stmt)).scalar() or 0
     
-    # Active users today (users with login activity - for now using registration as proxy)
-    active_today_stmt = select(func.count(User.user_id)).where(
-        User.registration_date >= today_start
-    )
+    # Active users today (proxy: registered today)
+    active_today_stmt = select(func.count(User.user_id)).where(User.registration_date >= today_start)
     active_today = (await session.execute(active_today_stmt)).scalar() or 0
     
-    # Users with active paid subscriptions
+    # Users with active paid subscriptions (non-trial providers only)
     paid_subs_stmt = (
         select(func.count(func.distinct(Subscription.user_id)))
         .join(User, Subscription.user_id == User.user_id)