more testing and better pylint score

backend/src/main.py

@@ -39,6 +39,8 @@ def new_trip(preferences: Preferences, start: tuple[float, float], end: tuple[fl
         raise HTTPException(status_code=406, detail="All preferences are 0.")
     if start is None:
         raise HTTPException(status_code=406, detail="Start coordinates not provided")
+    if not (-90 <= start[0] <= 90 or -180 <= start[1] <= 180):
+        raise HTTPException(status_code=423, detail="Start coordinates not in range")
     if end is None:
         end = start
         logger.info("No end coordinates provided. Using start=end.")
@@ -59,10 +61,10 @@ def new_trip(preferences: Preferences, start: tuple[float, float], end: tuple[fl
     # First stage optimization
     try:
         base_tour = optimizer.solve_optimization(preferences.max_time_minute, landmarks_short)
-    except ArithmeticError:
-        raise HTTPException(status_code=500, detail="No solution found")
-    except TimeoutError:
-        raise HTTPException(status_code=500, detail="Optimzation took too long")
+    except ArithmeticError as exc:
+        raise HTTPException(status_code=500, detail="No solution found") from exc
+    except TimeoutError as exc:
+        raise HTTPException(status_code=500, detail="Optimzation took too long") from exc
 
     # Second stage optimization
     refined_tour = refiner.refine_optimization(landmarks, base_tour, preferences.max_time_minute, preferences.detour_tolerance_minute)
@@ -88,8 +90,8 @@ def get_trip(trip_uuid: str) -> Trip:
     try:
         trip = cache_client.get(f"trip_{trip_uuid}")
         return trip
-    except KeyError:
-        raise HTTPException(status_code=404, detail="Trip not found")
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail="Trip not found") from exc
 
 
 @app.get("/landmark/{landmark_uuid}")
@@ -106,5 +108,5 @@ def get_landmark(landmark_uuid: str) -> Landmark:
     try:
         landmark = cache_client.get(f"landmark_{landmark_uuid}")
         return landmark
-    except KeyError:
-        raise HTTPException(status_code=404, detail="Landmark not found")
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail="Landmark not found") from exc