Remove unused alert envelope retention

internal/adapters/weatherapi/client.go

@@ -308,7 +308,7 @@ func (b *bundleBuilder) fetchAlerts(acquired sourceAcquisition) error {
 	}
 	raw, source := fetched.raw, fetched.source
 	if isJSONNull(raw) {
-		b.bundle.Alerts = &weatherdata.AlertRun{Raw: append(json.RawMessage(nil), raw...)}
+		b.bundle.Alerts = &weatherdata.AlertRun{}
 		b.addSource(source)
 		return nil
 	}
@@ -316,7 +316,6 @@ func (b *bundleBuilder) fetchAlerts(acquired sourceAcquisition) error {
 	if err := decodeSource(raw, &alerts); err != nil {
 		return b.handleMalformed(&source, err, acquired.request)
 	}
-	alerts.Raw = append(json.RawMessage(nil), raw...)
 	if alerts.AsOf != nil {
 		source.IssuedAt = alerts.AsOf
 	}

internal/weatherdata/bundle.go

@@ -148,7 +148,6 @@ func (p ForecastPeriod) HasValidPrecipitationProbability() bool {
 type AlertRun struct {
 	AsOf   *time.Time        `json:"asOf,omitempty"`
 	Alerts []json.RawMessage `json:"alerts,omitempty"`
-	Raw    json.RawMessage   `json:"raw,omitempty"`
 }
 
 type Discussion struct {