Fix sensors/history: catch unhandled exceptions, return 502 with detail

backend/api/routes/sensors.py

@@ -52,9 +52,15 @@ async def sensors_history(
     hours: int = Query(24, ge=1, le=8760, description="Hours of history (1–8760)"),
     hub: DataHub = Depends(get_datahub),
 ):
-    result = hub.vine_sensors.get_history(
-        device_type=type.value,
-        area=area.value if area else "treatment",
-        hours_back=hours,
-    )
-    return _check_error(result, "sensor history")
+    try:
+        result = hub.vine_sensors.get_history(
+            device_type=type.value,
+            area=area.value if area else "treatment",
+            hours_back=hours,
+        )
+        return _check_error(result, "sensor history")
+    except HTTPException:
+        raise
+    except Exception as exc:
+        log.error("Sensor history failed: %s", exc, exc_info=True)
+        raise HTTPException(status_code=502, detail=f"Sensor history unavailable: {exc}")