Change ai_edit_last_date to MongoDB Date object format - Store as Date object instead of string format

app/database.py

@@ -362,9 +362,6 @@ def log_media_click(
         category_object_id = _resolve_category_id(category_id, endpoint_path, default_category_id) 
         now = datetime.utcnow()
         
-        # Format date as DD/MM/YYYY for ai_edit_last_date
-        ai_edit_last_date = now.strftime("%d/%m/%Y")
-        
         logger.info("Media click - user_id input: %s, normalized: %s, category_id input: %s, normalized: %s", 
                    user_id, str(user_object_id), category_id, str(category_object_id)) 
 
@@ -379,7 +376,7 @@ def log_media_click(
                 "$set": {
                     "categories.$.lastClickedAt": now,
                     "updatedAt": now,
-                    "ai_edit_last_date": ai_edit_last_date  # Update last used date
+                    "ai_edit_last_date": now  # Update last used date (MongoDB Date object)
                 }, 
             }, 
         ) 
@@ -396,7 +393,7 @@ def log_media_click(
                         "$inc": {"ai_edit_complete": 1},  # Increment usage count
                         "$set": {
                             "updatedAt": now,
-                            "ai_edit_last_date": ai_edit_last_date  # Update last used date
+                            "ai_edit_last_date": now  # Update last used date (MongoDB Date object)
                         }, 
                         "$push": { 
                             "categories": { 
@@ -420,7 +417,7 @@ def log_media_click(
                         "$inc": {"ai_edit_complete": 1},  # Increment to 1 on first use
                         "$set": {
                             "updatedAt": now,
-                            "ai_edit_last_date": ai_edit_last_date  # Set last used date
+                            "ai_edit_last_date": now  # Set last used date (MongoDB Date object)
                         }, 
                         "$push": { 
                             "categories": {