Fixes #39

config/Windows/history.xml

 <window id="history">
     <layout type="vertical">
+		<layout type="horizontal">
+			<daterange id="dates" initial="6" /><!-- Last 7 Days -->
+			<stretch />
+		</layout>
         <sqlview id="table" />
     </layout>
     <program>
         <![CDATA[
-			var q = "SELECT time, machine, (SELECT name FROM items WHERE id = roasted_id) AS name, unroasted_total_quantity AS green, roasted_quantity AS roasted, ((unroasted_total_quantity - roasted_quantity) / unroasted_total_quantity * 100::numeric)::numeric(12,2) AS weight_loss, duration, annotation FROM roasting_log ORDER BY time DESC";
+			var dateSelect = findChildObject(this, 'dates');
+			var dateQuery = new QSqlQuery();
+			dateQuery.exec("SELECT time::date FROM roasting_log WHERE time = (SELECT min(time) FROM roasting_log) OR time = (SELECT max(time) FROM roasting_log) ORDER BY time ASC");
+			dateQuery.next();
+			var lifetimeStartDate = dateQuery.value(0);
+			var lifetimeEndDate;
+			if(dateQuery.next()) {
+				lifetimeEndDate = dateQuery.value(0);
+			} else {
+				lifetimeEndDate = lifetimeStartDate;
+			}
+			dateSelect.setLifetimeRange(lifetimeStartDate, lifetimeEndDate);
+			dateQuery.invalidate();
 			var table = findChildObject(this, 'table');
-			table.setQuery(q);
-			table.hideColumn(1);
 			table.openEntryRow.connect(function(arg) {
 				var details = createWindow("batchDetails");
 				details.loadData(table, arg);
 			});
+			function refresh() {
+				var dateRange = dateSelect.currentRange();
+				var startDate = "'"+dateRange[0]+"'";
+				var endDate = "'"+dateRange[dateRange.length - 1]+"'";
+				var q = "SELECT time, machine, (SELECT name FROM items WHERE id = roasted_id) AS name, unroasted_total_quantity AS green, roasted_quantity AS roasted, ((unroasted_total_quantity - roasted_quantity) / unroasted_total_quantity * 100::numeric)::numeric(12,2) AS weight_loss, duration, annotation FROM roasting_log WHERE time >= " + startDate + "::date AND time < " + endDate + "::date + interval '1 day' ORDER BY time DESC";
+				table.setQuery(q);
+				table.hideColumn(1);
+			}
+			dateSelect.rangeUpdated.connect(function() {
+				refresh();
+			});
+			refresh();
         ]]>
     </program>
 </window>