diff --git a/data-store/src/main/java/org/lucares/pdb/datastore/Entry.java b/data-store/src/main/java/org/lucares/pdb/datastore/Entry.java
index 0a23f2a..32d0d22 100644
--- a/data-store/src/main/java/org/lucares/pdb/datastore/Entry.java
+++ b/data-store/src/main/java/org/lucares/pdb/datastore/Entry.java
@@ -37,7 +37,8 @@ public class Entry {
     public String toString() {
 
         final OffsetDateTime date = Instant.ofEpochMilli(epochMilli).atOffset(ZoneOffset.UTC);
-        return date.format(DateTimeFormatter.ISO_ZONED_DATE_TIME) + " = " + value + " (" + tags.asString() + ")";
+        return date.format(DateTimeFormatter.ISO_ZONED_DATE_TIME) + " = " + value + " ("
+                + Tags.STRING_COMPRESSOR.asString(tags) + ")";
     }
 
     @Override
diff --git a/pdb-api/src/main/java/org/lucares/pdb/api/StringCompressor.java b/pdb-api/src/main/java/org/lucares/pdb/api/StringCompressor.java
index 1db4e2d..f8e6572 100644
--- a/pdb-api/src/main/java/org/lucares/pdb/api/StringCompressor.java
+++ b/pdb-api/src/main/java/org/lucares/pdb/api/StringCompressor.java
@@ -135,4 +135,21 @@ public class StringCompressor {
         }
         return result.toString();
     }
+
+    public String asString(final Tags tags) {
+
+        final StringBuilder result = new StringBuilder();
+
+        for (final Tag tag : tags.toTags()) {
+            if (result.length() > 0) {
+                result.append(", ");
+            }
+
+            result.append(get(tag.getKey()));
+            result.append("=");
+            result.append(get(tag.getValue()));
+        }
+
+        return result.toString();
+    }
 }
diff --git a/pdb-api/src/main/java/org/lucares/pdb/api/Tags.java b/pdb-api/src/main/java/org/lucares/pdb/api/Tags.java
index 9308d4b..2ee21d8 100644
--- a/pdb-api/src/main/java/org/lucares/pdb/api/Tags.java
+++ b/pdb-api/src/main/java/org/lucares/pdb/api/Tags.java
@@ -16,7 +16,6 @@ import org.lucares.utils.byteencoder.VariableByteEncoder;
 
 public class Tags implements Comparable<Tags> {
 
-    private static final String DEFAULT_GROUP = "<none>";
     public static StringCompressor STRING_COMPRESSOR = null;
     private static final byte[] EMPTY_BYTES = new byte[0];
     public static final Tags EMPTY = new Tags();
@@ -246,45 +245,4 @@ public class Tags implements Comparable<Tags> {
             keyValueConsumer.accept(key, value);
         }
     }
-
-    /**
-     * @return User facing readable representation
-     */
-//    TODO move
-//    to StringCompressor
-
-    public String asString() {
-
-        final StringBuilder result = new StringBuilder();
-
-        for (final Tag tag : tags) {
-            if (result.length() > 0) {
-                result.append(", ");
-            }
-
-            result.append(STRING_COMPRESSOR.get(tag.getKey()));
-            result.append("=");
-            result.append(STRING_COMPRESSOR.get(tag.getValue()));
-        }
-
-        return result.toString();
-    }
-
-//    TODO move
-//    to StringCompressor
-//
-//    public String asValueString() {
-//        final StringBuilder result = new StringBuilder();
-//        if (isEmpty()) {
-//            result.append(DEFAULT_GROUP);
-//        } else {
-//            forEach((k, v) -> {
-//                if (result.length() > 0) {
-//                    result.append(" / ");
-//                }
-//                result.append(v);
-//            });
-//        }
-//        return result.toString();
-//    }
 }
diff --git a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
index e132a25..8a8c05d 100644
--- a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
+++ b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
@@ -195,7 +195,7 @@ public class Plotter {
 
         METRICS_LOGGER.debug("wrote {} values to csv in: {}ms (ignored {} values) use millis: {}, grouping={}",
                 plottedValues, (System.nanoTime() - start) / 1_000_000.0, ignoredValues, Boolean.toString(useMillis),
-                groupResult.getGroupedBy().asString());
+                Tags.STRING_COMPRESSOR.asString(groupResult.getGroupedBy()));
         return new CsvSummary(count, statsMaxValue, statsCurrentAverage, aggregator);
 
     }