diff --git a/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java b/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
index f706a21..13f07e8 100644
--- a/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
+++ b/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
@@ -60,7 +60,7 @@ public class PdbController implements HardcodedValues {
 	public ModelAndView index() {
 		final String view = "main";
 		final Map<String, Object> model = new HashMap<>();
-		model.put("oldestValue", LocalDateTime.now().minusYears(1).format(DATE_FORMAT_BEGIN));
+		model.put("oldestValue", LocalDateTime.now().minusDays(7).format(DATE_FORMAT_BEGIN));
 		model.put("latestValue", LocalDateTime.now().format(DATE_FORMAT_END));
 		return new ModelAndView(view, model);
 	}
@@ -80,6 +80,7 @@ public class PdbController implements HardcodedValues {
 
 			final String imageUrl = WEB_IMAGE_OUTPUT_PATH + "/" + result.getImageName();
 			LOGGER.trace("image url:  {}", imageUrl);
+			System.gc();
 
 			return new PlotResponse(DataSeries.toMap(result.getDataSeries()), imageUrl);
 		} catch (final NoDataPointsException e) {