Fix NDVI: use Air1+Crop3, cap at 168h

backend/api/routes/sensors.py

@@ -166,16 +166,19 @@ async def temp_humidity(
 async def ndvi_history(
     hours: int = Query(168, ge=1, le=8760, description="Hours of history"),
 ):
-    """Hourly NDVI from ThingsBoard — treatment (Air2) and reference (Air1)."""
+    """Hourly NDVI from ThingsBoard — treatment (Crop3) and ambient (Air1)."""
     try:
         rows = []
-        for device, label in [("Air2", "treatment"), ("Air1", "ambient")]:
-            df = _tb_timeseries(device, ["NDVI"], hours)
-            if not df.empty and "NDVI" in df.columns:
-                for ts, row in df.iterrows():
-                    v = row.get("NDVI")
-                    if v is not None and v == v:
-                        rows.append({"timestamp": ts.isoformat(), "device": label, "ndvi": round(float(v), 4)})
+        for device, label in [("Air1", "ambient"), ("Crop3", "treatment")]:
+            try:
+                df = _tb_timeseries(device, ["NDVI"], min(hours, 168))
+                if not df.empty and "NDVI" in df.columns:
+                    for ts, row in df.iterrows():
+                        v = row.get("NDVI")
+                        if v is not None and v == v:
+                            rows.append({"timestamp": ts.isoformat(), "device": label, "ndvi": round(float(v), 4)})
+            except Exception:
+                pass
         return rows
     except Exception as exc:
         log.error("NDVI failed: %s", exc)