Improving the code for finding the last previous tick.

Author: staudtMarius

src/main/java/edu/ie3/datamodel/io/source/sql/SqlTimeSeriesSource.java

@@ -205,7 +205,7 @@ public Optional<ZonedDateTime> getLastTimeKeyBefore(ZonedDateTime time) {
         .executeQuery(
             queryForValueBefore, ps -> ps.setTimestamp(1, Timestamp.from(time.toInstant())))
         .map(valueFactory::extractTime)
-        .findFirst();
+        .max(ZonedDateTime::compareTo);
   }
 
   // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

src/main/java/edu/ie3/datamodel/models/timeseries/individual/IndividualTimeSeries.java

@@ -55,8 +55,8 @@ public Optional<V> getValue(ZonedDateTime time) {
   @Override
   public Optional<ZonedDateTime> getPreviousDateTime(ZonedDateTime time) {
     return timeToValue.keySet().stream()
-        .filter(valueTime -> valueTime.compareTo(time) < 0)
-        .max(Comparator.naturalOrder());
+        .filter(valueTime -> valueTime.isBefore(time))
+        .max(ZonedDateTime::compareTo);
   }
 
   @Override