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normalizers/nws: add NWS alerts normalizer and canonical alert mapping

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- Introduce AlertsNormalizer to convert Raw NWS Alerts (SchemaRawNWSAlertsV1)
  into canonical WeatherAlert runs (SchemaWeatherAlertV1)
- Add minimal NWS alerts response/types to support GeoJSON FeatureCollection parsing
- Map NWS alert properties (event, headline, severity, timing, area, references)
  into model.WeatherAlert with best-effort timestamp handling
- Establish clear AsOf / EffectiveAt policy for alert runs to support stable
  deduplication and snapshot semantics
- Register the new alerts normalizer alongside existing NWS observation and
  forecast normalizers
This commit is contained in:
Eric Rakestraw
2026-01-16 21:40:20 -06:00
parent 2eb2d4b90f
commit 00e811f8f7
7 changed files with 536 additions and 27 deletions
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3
internal/standards/schema.go
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@@ -19,7 +19,10 @@ const (
SchemaRawOpenMeteoHourlyForecastV1 = "raw.openmeteo.hourly.forecast.v1"
SchemaRawOpenWeatherHourlyForecastV1 = "raw.openweather.hourly.forecast.v1"
SchemaRawNWSAlertsV1 = "raw.nws.alerts.v1"
// Canonical domain schemas (emitted after normalization).
SchemaWeatherObservationV1 = "weather.observation.v1"
SchemaWeatherForecastV1 = "weather.forecast.v1"
SchemaWeatherAlertV1 = "weather.alert.v1"
)