Update zone_observation.py

zone_observation.py

@@ -83,9 +83,10 @@ class AlertLevel(Enum):
 
 @unique
 class DataSource(Enum):
-    ERA5_REANALYSIS  = "era5_reanalysis"   # ECMWF ERA5 via CDS or Open-Meteo
-    OPENMETEO_LIVE   = "openmeteo_live"    # Open-Meteo forecast API (free tier)
-    BMKG_STATION     = "bmkg_station"      # Indonesian met agency station data
+    ERA5_REANALYSIS   = "era5_reanalysis"    # ECMWF ERA5 via CDS or Open-Meteo
+    OPENMETEO_LIVE    = "openmeteo_live"     # Open-Meteo forecast API (free tier)
+    OPENMETEO_ARCHIVE = "openmeteo_archive"  # Open-Meteo historical archive API
+    BMKG_STATION      = "bmkg_station"       # Indonesian met agency station data
     SATELLITE_NDVI   = "satellite_ndvi"    # Sentinel-2 / Landsat NDVI tile
     SATELLITE_PRECIP = "satellite_precip"  # IMERG / CHIRPS retrieval (schema v3+)
     SATELLITE_SOIL   = "satellite_soil"    # SMAP L3/L4 retrieval (schema v3+)
@@ -1428,6 +1429,18 @@ if __name__ == "__main__":
         cfg_era5_back.force_data_source == DataSource.ERA5_REANALYSIS,
         "ForecastConfig force_data_source=ERA5 round-trip"
     )
+    _assert(DataSource.OPENMETEO_ARCHIVE.value == "openmeteo_archive",
+            "OPENMETEO_ARCHIVE enum member missing")
+    _assert(DataSource.OPENMETEO_ARCHIVE.is_observational(),
+            "OPENMETEO_ARCHIVE must be observational")
+    _assert(DataSource.OPENMETEO_ARCHIVE != DataSource.OPENMETEO_LIVE,
+            "ARCHIVE and LIVE must be distinct sources")
+    cfg_arch = ForecastConfig(force_data_source=DataSource.OPENMETEO_ARCHIVE)
+    cfg_arch_back = ForecastConfig.from_dict(cfg_arch.to_dict())
+    _assert(
+        cfg_arch_back.force_data_source == DataSource.OPENMETEO_ARCHIVE,
+        "ForecastConfig force_data_source=OPENMETEO_ARCHIVE round-trip"
+    )
     cfg_new = ForecastConfig(
         forecast_backend="openmeteo",
         use_climatology_anomalies=True,