fix(stats): recover stale odometer mileage

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

@@ -361,6 +361,24 @@ func (w *Writer) AppendWithResult(ctx context.Context, env envelope.FrameEnvelop
 		}
 		if w.seenSameMileage(sample) {
 			result.SamplesSkippedSameMileage++
+			// A repeated cumulative odometer is usually a harmless duplicate,
+			// but some upstream platforms keep reporting positions and speed
+			// while their instrument mileage remains stale for hours. Preserve
+			// the duplicate evidence and accumulate a speed-backed GPS
+			// candidate so real movement does not disappear from daily mileage.
+			if point, ok := GPSMileagePointFromEnvelope(env, identity, w.loc); ok && w.shouldAccumulateGPS(point) {
+				_, recovered, recoverErr := AccumulateGPSMileage(ctx, w.exec, point)
+				if recoverErr != nil {
+					return result, recoverErr
+				}
+				w.markGPSAccumulated(point)
+				if recovered {
+					result.SamplesWritten++
+					result.SamplesRecoveredGPSCoordinate++
+					result.ProjectionsAttempted++
+					result.ProjectionsWritten++
+				}
+			}
 			continue
 		}
 		candidate := SourceMileageSampleFromMetric(sample, identity)