fix(stats): recover jt808 mileage from safe gps tracks

go/vehicle-gateway/internal/stats/daily_metric.go

@@ -73,6 +73,7 @@ type AppendResult struct {
 	SamplesSkippedMissingVIN         int
 	SamplesSkippedMissingMileage     int
 	SamplesRecoveredStationary       int
+	SamplesRecoveredGPSCoordinate    int
 	SamplesSkippedNonMileageFrame    int
 	SamplesSkippedNonPositiveMileage int
 	SamplesSkippedMissingTime        int
@@ -248,6 +249,7 @@ func (w *Writer) CacheStats() CacheStats {
 func (w *Writer) EnsureSchema(ctx context.Context) error {
 	for _, statement := range []string{
 		DataSourceTableSQL,
+		GPSMileageStateTableSQL,
 		DailyMileageSourceTableSQL,
 		DailyMileageTableSQL,
 	} {
@@ -304,6 +306,20 @@ func (w *Writer) AppendWithResult(ctx context.Context, env envelope.FrameEnvelop
 	}
 	var stationaryCandidate *SourceMileageSample
 	if len(samples) == 0 && hasSource && result.SamplesSkippedMissingMileage > 0 {
+		if point, ok := GPSMileagePointFromEnvelope(env, identity, w.loc); ok {
+			_, recovered, recoverErr := AccumulateJT808GPSMileage(ctx, w.exec, point)
+			if recoverErr != nil {
+				return result, recoverErr
+			}
+			if recovered {
+				result.SamplesFound++
+				result.SamplesWritten++
+				result.SamplesRecoveredGPSCoordinate++
+				result.ProjectionsAttempted++
+				result.ProjectionsWritten++
+				return result, nil
+			}
+		}
 		sample, candidate, recovered, recoverErr := w.stationaryCarryForward(ctx, env, identity)
 		if recoverErr != nil {
 			return result, recoverErr