style: auto-fix lint violations from enhanced ruff rules

1 files changed, 6 insertions, 5 deletions

diff --git a/services/api/src/trading_api/routers/portfolio.py b/services/api/src/trading_api/routers/portfolio.py
index fde90cb..56bee7c 100644
--- a/services/api/src/trading_api/routers/portfolio.py
+++ b/services/api/src/trading_api/routers/portfolio.py
@@ -3,10 +3,11 @@
 import logging
 
 from fastapi import APIRouter, HTTPException, Query, Request
-from shared.sa_models import PositionRow
 from sqlalchemy import select
 from sqlalchemy.exc import OperationalError
 
+from shared.sa_models import PositionRow
+
 logger = logging.getLogger(__name__)
 
 router = APIRouter()
@@ -32,10 +33,10 @@ async def get_positions(request: Request):
             ]
     except OperationalError as exc:
         logger.error("Database error fetching positions: %s", exc)
-        raise HTTPException(status_code=503, detail="Database unavailable")
+        raise HTTPException(status_code=503, detail="Database unavailable") from exc
     except Exception as exc:
         logger.error("Failed to get positions: %s", exc, exc_info=True)
-        raise HTTPException(status_code=500, detail="Failed to retrieve positions")
+        raise HTTPException(status_code=500, detail="Failed to retrieve positions") from exc
 
 
 @router.get("/snapshots")
@@ -55,7 +56,7 @@ async def get_snapshots(request: Request, days: int = Query(30, ge=1, le=365)):
         ]
     except OperationalError as exc:
         logger.error("Database error fetching snapshots: %s", exc)
-        raise HTTPException(status_code=503, detail="Database unavailable")
+        raise HTTPException(status_code=503, detail="Database unavailable") from exc
     except Exception as exc:
         logger.error("Failed to get snapshots: %s", exc, exc_info=True)
-        raise HTTPException(status_code=500, detail="Failed to retrieve snapshots")
+        raise HTTPException(status_code=500, detail="Failed to retrieve snapshots") from exc