fix(socials): trending filter error

app/controllers/socials.py

@@ -67,16 +67,16 @@ def _calculate_time_decay_score(date_field, decay_days=TRENDING_DECAY_DAYS):
         Calculate a time decay score for trending calculations.
         Returns a value between 0 and 1, where newer items score higher.
         """
-        now = datetime.utcnow()
-        decay_start = now - timedelta(days=decay_days)
-
-        return case(
-            (date_field >= decay_start,
-             1.0 - (cast(func.extract('epoch', now - date_field), Float) /
-                    (decay_days * 86400.0))
-             ),
-            else_=0.1  # Minimum score for old items
-        )
+        now = func.now()
+        total_decay_seconds = decay_days * 86400.0
+
+        # Calculate age in seconds and convert to decay score
+        age_seconds = func.extract('epoch', now) - \
+            func.extract('epoch', date_field)
+        decay_score = func.greatest(
+            0.1, 1.0 - (age_seconds / total_decay_seconds))
+
+        return decay_score
 
     @staticmethod
     def _get_user_interests(user):
@@ -174,14 +174,15 @@ def get_projects_data(current_user, search=None, filter_type=None, page=1, per_p
         # Apply ordering based on filter type
         if filter_type == 'trending':
             # Advanced trending: combines follower count with time decay
+            follower_count = func.count(func.distinct(ProjectFollowers.id))
             time_decay = SocialService._calculate_time_decay_score(
                 Project.updated_at)
-            follower_count = func.count(func.distinct(ProjectFollowers.id))
 
             trending_score = (
                 (follower_count * SocialService.POPULARITY_WEIGHT) +
                 (time_decay * SocialService.RECENCY_WEIGHT)
-            )
+            ).label('trending_score')
+
             query = query.order_by(desc(trending_score),
                                    desc(Project.date_created))