diff --git a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesRequest.java b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesRequest.java
index 445737c..aac0f07 100644
--- a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesRequest.java
+++ b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesRequest.java
@@ -3,12 +3,10 @@
 import com.fasterxml.jackson.annotation.*;
 import edu.stanford.protege.webprotege.common.*;
 
-import java.sql.Timestamp;
-
 @JsonTypeName(GetChangedEntitiesRequest.CHANNEL)
 public record GetChangedEntitiesRequest(
         @JsonProperty("projectId") ProjectId projectId,
-        @JsonProperty("timestamp") Timestamp timestamp
+        @JsonProperty("timestamp") long timestamp
 ) implements Request<GetChangedEntitiesResponse> {
 
     public static final String CHANNEL = "webprotege.history.GetChangedEntities";
@@ -19,7 +17,7 @@ public String getChannel() {
     }
 
     public static GetChangedEntitiesRequest create(ProjectId projectId,
-                                                   Timestamp timestamp) {
+                                                   long timestamp) {
         return new GetChangedEntitiesRequest(projectId, timestamp);
     }
 }
diff --git a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventService.java b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventService.java
index 0a52714..77e48be 100644
--- a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventService.java
+++ b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventService.java
@@ -6,7 +6,6 @@
 import edu.stanford.protege.webprotegeeventshistory.uiHistoryConcern.events.NewRevisionsEvent;
 import org.semanticweb.owlapi.model.OWLEntity;
 
-import java.sql.Timestamp;
 import java.util.Optional;
 
 public interface NewRevisionsEventService {
@@ -15,7 +14,7 @@ public interface NewRevisionsEventService {
 
     Page<ProjectChange> fetchPaginatedProjectChanges(ProjectId projectId, Optional<OWLEntity> subject, int pageNumber, int pageSize);
 
-    ChangedEntities getChangedEntitiesAfterTimestamp(ProjectId projectId, Timestamp timestamp);
+    ChangedEntities getChangedEntitiesAfterTimestamp(ProjectId projectId, long timestamp);
 
     EntityHistorySummary getEntityHistorySummary(ProjectId projectId, String entityIri);
 }
diff --git a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceImpl.java b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceImpl.java
index d4ac8ab..79ce138 100644
--- a/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceImpl.java
+++ b/src/main/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceImpl.java
@@ -13,7 +13,6 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.sql.Timestamp;
 import java.time.*;
 import java.util.*;
 import java.util.stream.Collectors;
@@ -81,8 +80,8 @@ public Page<ProjectChange> fetchPaginatedProjectChanges(ProjectId projectId, Opt
     }
 
     @Override
-    public ChangedEntities getChangedEntitiesAfterTimestamp(ProjectId projectId, Timestamp timestamp) {
-        List<RevisionsEvent> revisionsEvents = repository.findByProjectIdAndTimestampAfter(projectId.id(), timestamp.getTime());
+    public ChangedEntities getChangedEntitiesAfterTimestamp(ProjectId projectId, long timestamp) {
+        List<RevisionsEvent> revisionsEvents = repository.findByProjectIdAndTimestampAfter(projectId.id(), timestamp);
 
         List<String> createdEntities = groupByChangeType(revisionsEvents, ChangeType.CREATE_ENTITY);
 
diff --git a/src/main/resources/application.yaml b/src/main/resources/application.yaml
index a898914..5cae292 100644
--- a/src/main/resources/application.yaml
+++ b/src/main/resources/application.yaml
@@ -1,7 +1,10 @@
 server:
   port: 7761
 
-logging.level.root: DEBUG
+logging:
+  level:
+    org.springframework.data.mongodb.core.MongoTemplate: DEBUG
+    org.mongodb.driver: DEBUG
 
 spring:
   application:
diff --git a/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesCommandHandlerIT.java b/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesCommandHandlerIT.java
index a3c9425..3b67c40 100644
--- a/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesCommandHandlerIT.java
+++ b/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/handlers/GetChangedEntitiesCommandHandlerIT.java
@@ -48,7 +48,7 @@ public void GIVEN_eventsAfterTimestamp_WHEN_handleRequestCalled_THEN_returnChang
         insertMockRevisionsEvent(projectId, "entity2", timestamp.getTime() + 5000, ChangeType.UPDATE_ENTITY);
         insertMockRevisionsEvent(projectId, "entity3", timestamp.getTime() + 6000, ChangeType.DELETE_ENTITY);
 
-        GetChangedEntitiesRequest request = GetChangedEntitiesRequest.create(projectId, timestamp);
+        GetChangedEntitiesRequest request = GetChangedEntitiesRequest.create(projectId, timestamp.getTime());
 
         Mono<GetChangedEntitiesResponse> responseMono = commandHandler.handleRequest(request, null);
         GetChangedEntitiesResponse response = responseMono.block();
diff --git a/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceTest.java b/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceTest.java
index 5608f59..71a55b2 100644
--- a/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceTest.java
+++ b/src/test/java/edu/stanford/protege/webprotegeeventshistory/uiHistoryConcern/services/NewRevisionsEventServiceTest.java
@@ -134,7 +134,7 @@ public void GIVEN_noResults_WHEN_fetchPaginatedProjectChangesCalled_THEN_returnE
     public void GIVEN_noEntitiesChangedAfterTimestamp_WHEN_getChangedEntitiesAfterTimestampCalled_THEN_emptyChangedEntitiesReturned() {
         when(repository.findByProjectIdAndTimestampAfter(projectId.id(), timestamp.getTime())).thenReturn(List.of());
 
-        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp);
+        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp.getTime());
 
         assertEquals(0, result.createdEntities().size());
         assertEquals(0, result.updatedEntities().size());
@@ -151,7 +151,7 @@ public void GIVEN_entitiesChangedAfterTimestamp_WHEN_getChangedEntitiesAfterTime
 
         when(repository.findByProjectIdAndTimestampAfter(projectId.id(), timestamp.getTime())).thenReturn(List.of(createdEntity, updatedEntity, deletedEntity));
 
-        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp);
+        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp.getTime());
 
         assertEquals(1, result.createdEntities().size());
         assertEquals("entityIRI1", result.createdEntities().get(0));
@@ -173,7 +173,7 @@ public void GIVEN_multipleEntitiesChangedAfterTimestamp_WHEN_getChangedEntitiesA
 
         when(repository.findByProjectIdAndTimestampAfter(projectId.id(), timestamp.getTime())).thenReturn(List.of(createdEntity1, createdEntity2, updatedEntity));
 
-        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp);
+        ChangedEntities result = service.getChangedEntitiesAfterTimestamp(projectId, timestamp.getTime());
 
         assertEquals(1, result.createdEntities().size());
         assertEquals("entityIRI1", result.createdEntities().get(0));