small enhancements

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

@@ -31,7 +31,7 @@ public class Entry {
 
 	Entry(final long epochMilli, final long value, final Tags tags) {
 		if (value < 0 || value > MAX_VALUE) {
-			throw new IllegalArgumentException("value must be between 0 and " + MAX_VALUE);
+			throw new IllegalArgumentException("value must be between 0 and " + MAX_VALUE + ", but was " + value);
 		}
 
 		this.epochMilli = epochMilli;

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

@@ -83,14 +83,12 @@ public class PerformanceDb implements AutoCloseable {
 				}
 				final Entry entry = entryOptional.get();
 
-				final long epochMilli = entry.getEpochMilli();
-				final long value = entry.getValue();
 				final Tags tags = entry.getTags();
 				final OffsetDateTime date = entry.getDate();
 
 				final PdbWriter writer = manager.get(tags, date);
 
-				writer.write(epochMilli, value);
+				writer.write(entry);
 				count++;
 			}