remove TODOs

They don't make sense anymore.
E.g. the Tags class is used by classes outside of
org.lucares.performance.db.

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

@@ -141,8 +141,7 @@ public class TcpIngestor implements Ingestor, AutoCloseable, DisposableBean {
 					// these fields are not tags
 					break;
 				case "tags":
-					// TODO @ahr add support for simple tags, currently we
-					// only support key/value tags
+					// ignore: we only support key/value tags
 					break;
 				default:
 					tags = tags.copyAddIfNotNull(key, String.valueOf(value));