Updated prefix

lib/storage.ts

@@ -185,7 +185,7 @@ function partitionPathFromSegmentId(id: string): string {
 }
 
 function buildPartitionedFilePath(prefix: string, id: string): string {
-  return path.join(DATA_DIR, partitionPathFromSegmentId(id), `${prefix}-${id}.parquet`);
+  return path.join(DATA_DIR, prefix, partitionPathFromSegmentId(id), `${prefix}-${id}.parquet`);
 }
 
 function buildVehicleFile(id: string): string {