Fix viewing-history artwork and add transcode playback metrics

backend/app/routers/insights.py

@@ -6,10 +6,19 @@ from pydantic import BaseModel, ConfigDict, field_validator
 from ..auth import get_current_user
 from ..clients.jellystat import HistoryLimitError, JellystatError
 from ..services.insights import get_insights
+from ..services.insights_artwork import get_artwork
+from ..runtime import get_runtime_settings
 
 router = APIRouter(prefix="/insights", tags=["insights"])
 
 
+@router.get("/artwork/{item_id}")
+async def artwork(item_id: str, token: Annotated[str, Query(max_length=100)], user: dict = Depends(get_current_user)):
+    content, media_type = await get_artwork(user, get_runtime_settings(), item_id, token)
+    return Response(content=content, media_type=media_type,
+                    headers={"Cache-Control": "private, max-age=600", "Vary": "Cookie, Authorization", "X-Content-Type-Options": "nosniff"})
+
+
 class InsightsQuery(BaseModel):
     model_config = ConfigDict(extra="forbid")
     days: int = 30