Fix some IDE warnings, mostly around type safety on the Python side

data/solar_conditions.py

@@ -110,11 +110,11 @@ class HFBandCondition:
     """Data class representing HF propagation conditions for certain bands and time of day."""
 
     # Band name, e.g. "80m-40m", "20m-17m", "10m-6m"
-    band: str = None
+    band: str | None = None
     # Time of day: "day" or "night"
-    time: str = None
+    time: str | None = None
     # Propagation condition: "Good", "Fair", or "Poor"
-    condition: str = None
+    condition: str | None = None
 
 
 @dataclass
@@ -122,66 +122,66 @@ class SolarConditions:
     """Data class representing current solar and propagation conditions."""
 
     # Time the data was last updated at the source, UTC seconds since UNIX epoch
-    updated: float = None
+    updated: float | None = None
     # Solar Flux Index (SFI)
-    sfi: int = None
+    sfi: int | None = None
     # A-index (daily geomagnetic activity)
-    a_index: int = None
+    a_index: int | None = None
     # K-index (3-hour geomagnetic activity)
-    k_index: int = None
+    k_index: int | None = None
     # X-ray flux class, e.g. "B2.3", "C1.0"
-    xray: str = None
+    xray: str | None = None
     # Proton flux
-    proton_flux: int = None
+    proton_flux: int | None = None
     # Electron flux
-    electron_flux: int = None
+    electron_flux: int | None = None
     # Aurora activity level
-    aurora: int = None
+    aurora: int | None = None
     # Latitude in degrees of the aurora boundary
-    aurora_latitude: float = None
+    aurora_latitude: float | None = None
     # Sunspot count
-    sunspots: int = None
+    sunspots: int | None = None
     # Solar wind speed in km/s
-    solar_wind: float = None
+    solar_wind: float | None = None
     # Interplanetary magnetic field strength in nT
-    magnetic_field: float = None
+    magnetic_field: float | None = None
     # Geomagnetic field condition, e.g. "Quiet", "Unsettled", "Active", "Storm"
-    geomag_field: str = None
+    geomag_field: str | None = None
     # Geomagnetic background noise level, e.g. "S0", "S1", "S2"
-    geomag_noise: str = None
+    geomag_noise: str | None = None
     # HF band propagation conditions, keyed by "{band}-{time}" e.g. "80m-40m-day"
-    hf_conditions: dict = None
+    hf_conditions: dict | None = None
     # VHF propagation conditions, keyed by condition name
-    vhf_conditions: dict = None
+    vhf_conditions: dict | None = None
     # NOAA Kp index 3-day forecast, keyed by UNIX timestamp of the start of each 3-hour UTC period
-    k_index_forecast: dict = None
+    k_index_forecast: dict | None = None
     # NOAA Solar Radiation Storm (S1 or greater) probability forecast, keyed by UNIX timestamp of start of day UTC
-    solar_storm_forecast: dict = None
+    solar_storm_forecast: dict | None = None
     # NOAA Radio Blackout (R1-R2) probability forecast, keyed by UNIX timestamp of start of day UTC
-    blackout_forecast_r1r2: dict = None
+    blackout_forecast_r1r2: dict | None = 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
+    blackout_forecast_r3_or_greater: dict | None = None
     # Ionosonde measurements, dict keyed by URSI code, values are dicts with keys: ursi, name, fof2, muf, luf,
     # band_states. Populated by GIROIonosonde or KC2GProp providers.
-    ionosonde_data: dict = None
+    ionosonde_data: dict | None = None
 
     # Derived values (populated by infer_descriptions())
     # HF radio blackout risk description, derived from xray
-    xray_desc: str = None
+    xray_desc: str | None = None
     # HF radio blackout scale number (R0-R5), derived from xray
-    radio_blackout_scale: int = None
+    radio_blackout_scale: int | None = None
     # Solar radiation storm level description, derived from proton_flux
-    proton_flux_desc: str = None
+    proton_flux_desc: str | None = None
     # Solar radiation storm scale number (S0-S5), derived from proton_flux
-    solar_storm_scale: int = None
+    solar_storm_scale: int | None = None
     # Geomagnetic storm level description, derived from k_index
-    geomag_storm_desc: str = None
+    geomag_storm_desc: str | None = None
     # Geomagnetic storm scale number (G0-G5), derived from k_index
-    geomag_storm_scale: int = None
+    geomag_storm_scale: int | None = None
     # Overall HF band conditions summary, derived from sfi
-    band_conditions_desc: str = None
+    band_conditions_desc: str | None = None
     # Electron flux description, derived from electron_flux
-    electron_flux_desc: str = None
+    electron_flux_desc: str | None = None
 
     def infer_descriptions(self):
         """Populate derived text description fields from the current numeric/raw field values."""