fix(userbot): encode absent pyrogram raw payloads as empty json

backend/src/userbot/modules/stories/service.py

@@ -3,6 +3,7 @@ from pyrogram.types import Story
 
 from userbot.modules.capture.context import CaptureContext
 from userbot.modules.download import download_bytes
+from userbot.modules.raw_json import raw_json
 from userbot.modules.stories import repository
 
 
@@ -40,7 +41,7 @@ async def save_story(client: Client, capture: CaptureContext, story: Story) -> N
         storage_key,
         file_size,
         story.views,
-        str(story.raw),
+        raw_json(story.raw),
         pinned=bool(story.pinned),
         deleted=bool(story.deleted),
         downloaded=downloaded,