diff --git a/database-connector/src/main/java/life/qbic/projectmanagement/experiment/persistence/SampleStatisticEntry.java b/database-connector/src/main/java/life/qbic/projectmanagement/experiment/persistence/SampleStatisticEntry.java
index 0749ea1c2..e2e4ab7f5 100644
--- a/database-connector/src/main/java/life/qbic/projectmanagement/experiment/persistence/SampleStatisticEntry.java
+++ b/database-connector/src/main/java/life/qbic/projectmanagement/experiment/persistence/SampleStatisticEntry.java
@@ -5,6 +5,7 @@
 import jakarta.persistence.Embedded;
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.Table;
 import java.util.Objects;
@@ -27,7 +28,7 @@
 public class SampleStatisticEntry {
 
   @Id
-  @GeneratedValue
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
   private long id;
   @Embedded
   @AttributeOverride(name = "value", column = @Column(name = "projectCode"))
diff --git a/projectmanagement/src/main/java/life/qbic/projectmanagement/application/sample/SampleInformationService.java b/projectmanagement/src/main/java/life/qbic/projectmanagement/application/sample/SampleInformationService.java
index 5de5db90c..e8898dcd7 100644
--- a/projectmanagement/src/main/java/life/qbic/projectmanagement/application/sample/SampleInformationService.java
+++ b/projectmanagement/src/main/java/life/qbic/projectmanagement/application/sample/SampleInformationService.java
@@ -49,6 +49,7 @@ public Result<Collection<Sample>, ResponseCode> retrieveSamplesForExperiment(
    * @return the results in the provided range
    * @since 1.0.0
    */
+
   public List<SamplePreview> queryPreview(ExperimentId experimentId, int offset, int limit,
       List<SortOrder> sortOrders, String filter) {
     // returned by JPA -> UnmodifiableRandomAccessList
diff --git a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalGroup.java b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalGroup.java
index fba03ae2f..7ac9ecc0d 100644
--- a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalGroup.java
+++ b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalGroup.java
@@ -3,6 +3,7 @@
 import jakarta.persistence.CascadeType;
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.OneToMany;
@@ -28,7 +29,7 @@ public class ExperimentalGroup {
   private List<BiologicalReplicate> biologicalReplicates;
   private Condition condition;
   @Id
-  @GeneratedValue
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long experimentalGroupId;
   private int sampleSize;
 
diff --git a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalVariable.java b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalVariable.java
index 733085d82..c845a5326 100644
--- a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalVariable.java
+++ b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/experiment/ExperimentalVariable.java
@@ -6,6 +6,7 @@
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -31,7 +32,7 @@
 public class ExperimentalVariable {
 
   @Id
-  @GeneratedValue
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
   private long variableId;
 
   @Convert(converter = VariableNameAttributeConverter.class)