use DateTimeRange.max() instead of arbitrary relative range

performanceDb/src/main/java/org/lucares/performance/db/PdbExport.java

@@ -77,8 +77,7 @@ public class PdbExport {
 		try (final PerformanceDb db = new PerformanceDb(dataDirectory);) {
 
 			LOGGER.info("Searching for all files. This may take a while ...");
-			// TODO time range should not be static, but include everything
-			final List<PdbFile> pdbFiles = db.getFilesForQuery(new Query("", DateTimeRange.relativeYears(5)));
+			final List<PdbFile> pdbFiles = db.getFilesForQuery(new Query("", DateTimeRange.max()));
 
 			long count = 0;
 			long lastEpochMilli = 0;