Short/long/closed display for each band calculated from latest data for each ionosonde station

data/band.py

@@ -11,3 +11,5 @@ class Band:
     start_freq: float
     # Stop frequency, in Hz
     end_freq: float
+    # Whether this is an HF amateur radio band
+    is_ham_hf: bool = False

data/solar_conditions.py

@@ -161,7 +161,8 @@ class SolarConditions:
     blackout_forecast_r1r2: dict = None
     # NOAA Radio Blackout (R3 or greater) probability forecast, keyed by UNIX timestamp of start of day UTC
     blackout_forecast_r3_or_greater: dict = None
-    # Ionosonde measurements from LGDC, dict keyed by URSI code, values are dicts with keys: ursi, name, fof2, muf, luf
+    # Ionosonde measurements from LGDC, dict keyed by URSI code, values are dicts with keys: ursi, name, fof2, muf, luf,
+    # band_states
     ionosonde_data: dict = None
 
     # Derived values (populated by infer_descriptions())
@@ -196,6 +197,7 @@ class SolarConditions:
         self.electron_flux_desc = _lookup_by_threshold(self.electron_flux, ELECTRON_FLUX_DESCRIPTIONS)
 
     def to_json(self):
-        """JSON serialise"""
+        """JSON serialise. Dict key order is insertion order (Python 3.7+ guarantee), so callers receive
+        fields in a predictable, logical sequence without relying on sort_keys."""
 
-        return json.dumps(self, default=lambda o: o.__dict__, sort_keys=True)
+        return json.dumps(self, default=lambda o: o.__dict__)