fix performance regression

The last improvement of memory usage introduced a performance
regression. The ingestion performance dropped by 50%-80%, because
for every inserted entry the Tags were created inefficient.

pdb-ui/src/main/java/org/lucares/pdbui/TcpIngestor.java

@@ -24,6 +24,7 @@ import javax.annotation.PreDestroy;
 
 import org.lucares.pdb.api.Entry;
 import org.lucares.pdb.api.Tags;
+import org.lucares.pdb.api.TagsBuilder;
 import org.lucares.performance.db.BlockingQueueIterator;
 import org.lucares.performance.db.PerformanceDb;
 import org.lucares.recommind.logs.Config;
@@ -124,7 +125,7 @@ public class TcpIngestor implements Ingestor, AutoCloseable, DisposableBean {
 		}
 
 		private Tags createTags(final Map<String, Object> map) {
-			Tags tags = Tags.create();
+			final TagsBuilder tags = TagsBuilder.create();
 			for (final java.util.Map.Entry<String, Object> e : map.entrySet()) {
 
 				final String key = e.getKey();
@@ -139,11 +140,15 @@ public class TcpIngestor implements Ingestor, AutoCloseable, DisposableBean {
 					// ignore: we only support key/value tags
 					break;
 				default:
-					tags = tags.copyAddIfNotNull(key, String.valueOf(value));
+					if (value instanceof String) {
+						tags.add(key, (String) value);
+					} else {
+						tags.add(key, String.valueOf(value));
+					}
 					break;
 				}
 			}
-			return tags;
+			return tags.build();
 		}
 
 		private OffsetDateTime getDate(final Map<String, Object> map) {