Fix type and handle missing dewar_id in sample router.

Updated puck_id type from str to int for better type consistency. Added a fallback value of -1 for pucks with missing dewar_id to prevent potential errors when querying pucks.

backend/app/routers/sample.py

@@ -22,7 +22,7 @@ router = APIRouter()
 
 
 @router.get("/{puck_id}/samples", response_model=List[SampleSchema])
-async def get_samples_with_events(puck_id: str, db: Session = Depends(get_db)):
+async def get_samples_with_events(puck_id: int, db: Session = Depends(get_db)):
     puck = db.query(PuckModel).filter(PuckModel.id == puck_id).first()
     if not puck:
         raise HTTPException(status_code=404, detail="Puck not found")
@@ -46,6 +46,8 @@ async def get_all_pucks_with_samples_and_events(db: Session = Depends(get_db)):
     pucks = db.query(PuckModel).all()
     logging.info(f"Found {len(pucks)} pucks in the database")
     for puck in pucks:
+        if puck.dewar_id is None:
+            puck.dewar_id = -1
         logging.info(f"Puck ID: {puck.id}, Name: {puck.puck_name}")
 
     if not pucks: