Fix the cache loading for static content

apps/content/backend/content/content_service.py

@@ -15,10 +15,14 @@ class ContentService:
     async def retrieve_content_directories_for_folder(
         self, folder_name: str, region: UserRegion
     ) -> List[ContentDirectory]:
-        folder = await ContentFolderDoc.find_one(
+        folder = (
+            await ContentFolderDoc.find(
                 ContentFolderDoc.folder_name == folder_name,
                 ContentFolderDoc.region == region,
             )
+            .sort(-ContentFolderDoc.udpate_time)
+            .first_or_none()
+        )
         if folder is None or folder.valid_thru.replace(
             tzinfo=timezone.utc
         ) < datetime.now(timezone.utc):

apps/content/backend/content/models.py

@@ -27,3 +27,7 @@ class ContentFolderDoc(Document):
 
     class Settings:
         name = "content_folder"
+        indexes = [
+            [("folder_name", 1), ("region", 1)],  # Compound index
+            [("udpate_time", -1)],  # Descending index for udpate_time
+        ]