diff --git a/backend/src/main/java/ch/xxx/aidoclibchat/usecase/service/DocumentService.java b/backend/src/main/java/ch/xxx/aidoclibchat/usecase/service/DocumentService.java
index 1d33c4f..a74985d 100644
--- a/backend/src/main/java/ch/xxx/aidoclibchat/usecase/service/DocumentService.java
+++ b/backend/src/main/java/ch/xxx/aidoclibchat/usecase/service/DocumentService.java
@@ -18,6 +18,8 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.ai.client.AiClient;
 import org.springframework.ai.client.AiResponse;
 import org.springframework.ai.client.Generation;
@@ -38,7 +40,8 @@
 @Service
 @Transactional
 public class DocumentService {
-	private final static String ID = "id";
+	private static final Logger LOGGER = LoggerFactory.getLogger(DocumentService.class);
+	private static final String ID = "id";
 	private final DocumentRepository documentRepository;
 	private final DocumentVsRepository documentVsRepository;
 	private final AiClient aiClient;
@@ -64,6 +67,7 @@ public Long storeDocument(Document document) {
 			myDocument1.getMetadata().put(ID, myDocument.getId());
 			return Stream.of(myDocument1);
 		}).toList();
+		LOGGER.info("Name: {}, size: {}", document.getDocumentName(), documents.size());
 		this.documentVsRepository.add(documents);
 		return Optional.ofNullable(myDocument.getDocumentContent()).stream()
 				.map(myContent -> Integer.valueOf(myContent.length).longValue()).findFirst().orElse(0L);
diff --git a/backend/src/main/resources/dbchangelog/changes/db.changelog-1.xml b/backend/src/main/resources/dbchangelog/changes/db.changelog-1.xml
index b11baf2..5aa798a 100644
--- a/backend/src/main/resources/dbchangelog/changes/db.changelog-1.xml
+++ b/backend/src/main/resources/dbchangelog/changes/db.changelog-1.xml
@@ -11,7 +11,10 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
                       http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.8.xsd">
-	<changeSet author="angular2guy" id="1">
+	<changeSet id="1" author="angular2guy">
+		<sql>CREATE EXTENSION if not exists hstore SCHEMA public;</sql>
+	</changeSet>
+	<changeSet author="angular2guy" id="2">
 		<createTable tableName="document">
 			<column name="id" type="bigint">
 				<constraints primaryKey="true"/> 
@@ -25,7 +28,7 @@
 			<column name="document_content" type="blob"/>
 		</createTable>
 	</changeSet>
-	<changeSet author="angular2guy" id="2">
+	<changeSet author="angular2guy" id="3">
 		<createSequence sequenceName="document_seq" incrementBy="50"
 			startValue="1000" />
 	</changeSet>