reduce memory usage

Reduce memory usage by storing the filename as string instead of
individual tags.

pdb-ui/src/test/java/org/lucares/performance/db/ingestor/TcpIngestorTest.java

@@ -7,6 +7,7 @@ import java.time.Instant;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
 import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoUnit;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -75,10 +76,12 @@ public class TcpIngestorTest {
 			Assert.assertEquals(result.size(), 2);
 
 			Assert.assertEquals(result.get(0).getValue(), 1);
-			Assert.assertEquals(result.get(0).getDate().toInstant(), dateA.toInstant());
+			Assert.assertEquals(result.get(0).getDate().toInstant().truncatedTo(ChronoUnit.MILLIS),
+					dateA.toInstant().truncatedTo(ChronoUnit.MILLIS));
 
 			Assert.assertEquals(result.get(1).getValue(), 2);
-			Assert.assertEquals(result.get(1).getDate().toInstant(), dateB.toInstant());
+			Assert.assertEquals(result.get(1).getDate().toInstant().truncatedTo(ChronoUnit.MILLIS),
+					dateB.toInstant().truncatedTo(ChronoUnit.MILLIS));
 		}
 	}
 
@@ -99,8 +102,8 @@ public class TcpIngestorTest {
 			entryA.put("tags", Collections.emptyList());
 
 			// skipped, because it is not valid json
-			String corrupEntry = "{\"corrupt...";
-			
+			final String corrupEntry = "{\"corrupt...";
+
 			// valid entry
 			final Map<String, Object> entryB = new HashMap<>();
 			entryB.put("duration", 2);
@@ -109,9 +112,9 @@ public class TcpIngestorTest {
 			entryB.put("tags", Collections.emptyList());
 
 			final ObjectMapper objectMapper = new ObjectMapper();
-			final String data = objectMapper.writeValueAsString(entryA)+"\n"+corrupEntry+"\n"+objectMapper.writeValueAsString(entryB)+"\n";
-			
-			
+			final String data = objectMapper.writeValueAsString(entryA) + "\n" + corrupEntry + "\n"
+					+ objectMapper.writeValueAsString(entryB) + "\n";
+
 			PdbTestUtil.send(data);
 		}
 
@@ -120,7 +123,8 @@ public class TcpIngestorTest {
 			Assert.assertEquals(result.size(), 1);
 
 			Assert.assertEquals(result.get(0).getValue(), 2);
-			Assert.assertEquals(result.get(0).getDate().toInstant(), dateB.toInstant());
+			Assert.assertEquals(result.get(0).getDate().toInstant().truncatedTo(ChronoUnit.MILLIS),
+					dateB.toInstant().truncatedTo(ChronoUnit.MILLIS));
 		}
 	}
 }