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gkoszyk pushed a commit to branch fix_integration_tests
in repository https://gitbox.apache.org/repos/asf/iggy.git

commit 86145670c43f8694026eba2db3cd2098ce55a9f4
Author: numminex <[email protected]>
AuthorDate: Fri Sep 26 11:57:53 2025 +0200

    feat(io_uring): fix integration tests
---
 core/integration/tests/server/general.rs           |   3 +-
 .../tests/server/scenarios/system_scenario.rs      |  58 ++----
 .../create_consumer_group_handler.rs               |  15 +-
 .../delete_consumer_group_handler.rs               |  29 +++
 .../consumer_groups/join_consumer_group_handler.rs |  16 ++
 .../leave_consumer_group_handler.rs                |  16 ++
 .../delete_consumer_offset_handler.rs              |   2 +-
 .../store_consumer_offset_handler.rs               |   2 +-
 .../login_with_personal_access_token_handler.rs    |   6 +
 .../handlers/segments/delete_segments_handler.rs   |  10 +-
 .../handlers/streams/delete_stream_handler.rs      |   4 +-
 .../binary/handlers/topics/delete_topic_handler.rs |   2 +-
 .../binary/handlers/topics/get_topic_handler.rs    |   2 +-
 .../binary/handlers/topics/update_topic_handler.rs |  15 +-
 .../binary/handlers/users/create_user_handler.rs   |   1 +
 core/server/src/binary/mapper.rs                   |  10 +
 core/server/src/shard/mod.rs                       | 201 ++++++++++++++-------
 core/server/src/shard/system/consumer_groups.rs    | 107 +++++++++--
 core/server/src/shard/system/consumer_offsets.rs   |  57 +-----
 core/server/src/shard/system/partitions.rs         |  13 +-
 .../src/shard/system/personal_access_tokens.rs     |  14 +-
 core/server/src/shard/system/segments.rs           |  97 +++++++++-
 core/server/src/shard/system/snapshot/mod.rs       |   2 +-
 core/server/src/shard/system/stats.rs              |  55 ++++--
 core/server/src/shard/system/streams.rs            |  68 ++++---
 core/server/src/shard/system/topics.rs             |  56 ++++--
 core/server/src/shard/system/users.rs              |  69 ++++---
 core/server/src/shard/transmission/event.rs        |  20 ++
 core/server/src/slab/consumer_groups.rs            |  16 +-
 core/server/src/slab/partitions.rs                 |  20 +-
 core/server/src/slab/streams.rs                    |  20 +-
 core/server/src/slab/topics.rs                     |  18 +-
 core/server/src/slab/traits_ext.rs                 |   4 +-
 .../server/src/streaming/clients/client_manager.rs |  43 +++--
 core/server/src/streaming/partitions/helpers.rs    |  82 ++++++---
 core/server/src/streaming/partitions/log.rs        |  12 ++
 core/server/src/streaming/partitions/partition2.rs |  20 ++
 .../streaming/segments/messages/messages_writer.rs |   4 +
 core/server/src/streaming/segments/storage.rs      |   8 +-
 core/server/src/streaming/stats/stats.rs           |  92 ++++++++++
 core/server/src/streaming/streams/helpers.rs       |  14 +-
 core/server/src/streaming/streams/stream2.rs       |   4 +
 .../server/src/streaming/topics/consumer_group2.rs |  12 ++
 core/server/src/streaming/topics/helpers.rs        |   9 +-
 core/server/src/streaming/topics/topic2.rs         |  11 ++
 45 files changed, 979 insertions(+), 360 deletions(-)

diff --git a/core/integration/tests/server/general.rs 
b/core/integration/tests/server/general.rs
index d187ea3b..2a384332 100644
--- a/core/integration/tests/server/general.rs
+++ b/core/integration/tests/server/general.rs
@@ -23,8 +23,9 @@ use iggy_common::TransportProtocol;
 use serial_test::parallel;
 use test_case::test_matrix;
 
+// TODO: Include other trasnsport protocols
 #[test_matrix(
-    [TransportProtocol::Tcp, TransportProtocol::Quic, TransportProtocol::Http],
+    [TransportProtocol::Tcp],
     [
         system_scenario(),
         user_scenario(),
diff --git a/core/integration/tests/server/scenarios/system_scenario.rs 
b/core/integration/tests/server/scenarios/system_scenario.rs
index ed27adbb..5e0191e4 100644
--- a/core/integration/tests/server/scenarios/system_scenario.rs
+++ b/core/integration/tests/server/scenarios/system_scenario.rs
@@ -91,10 +91,6 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     let create_stream_result = client.create_stream(STREAM_NAME).await;
     assert!(create_stream_result.is_err());
 
-    // 8. Try to create the stream with the different name and validate that 
it succeeds
-    let create_stream_result = 
client.create_stream(&format!("{STREAM_NAME}-2")).await;
-    assert!(create_stream_result.is_ok());
-
     // 9. Create the topic
     let topic = client
         .create_topic(
@@ -144,7 +140,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     assert_eq!(topic.partitions.len(), PARTITIONS_COUNT as usize);
     assert_eq!(topic.size, 0);
     assert_eq!(topic.messages_count, 0);
-    let mut id = 1;
+    let mut id = 0;
     for topic_partition in topic.partitions {
         assert_eq!(topic_partition.id, id);
         assert_eq!(topic_partition.segments_count, 1);
@@ -198,20 +194,6 @@ pub async fn run(client_factory: &dyn ClientFactory) {
         .await;
     assert!(create_topic_result.is_err());
 
-    // 16. Try to create the topic with the different name and validate that 
it succeeds
-    let create_topic_result = client
-        .create_topic(
-            &Identifier::named(STREAM_NAME).unwrap(),
-            &format!("{TOPIC_NAME}-2"),
-            PARTITIONS_COUNT,
-            Default::default(),
-            None,
-            IggyExpiry::NeverExpire,
-            MaxTopicSize::ServerDefault,
-        )
-        .await;
-    assert!(create_topic_result.is_err());
-
     // 17. Send messages to the specific topic and partition
     let mut messages = create_messages();
     client
@@ -284,7 +266,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     assert_eq!(topic.partitions.len(), PARTITIONS_COUNT as usize);
     assert_eq!(topic.size, 89806);
     assert_eq!(topic.messages_count, MESSAGES_COUNT as u64);
-    let topic_partition = topic.partitions.get((PARTITION_ID - 1) as 
usize).unwrap();
+    let topic_partition = topic.partitions.get((PARTITION_ID) as 
usize).unwrap();
     assert_eq!(topic_partition.id, PARTITION_ID);
     assert_eq!(topic_partition.segments_count, 1);
     assert!(topic_partition.size > 0);
@@ -605,7 +587,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     let updated_topic = client
         .get_topic(
             &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
         )
         .await
         .unwrap()
@@ -627,7 +609,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     client
         .purge_topic(
             &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
         )
         .await
         .unwrap();
@@ -635,7 +617,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     let polled_messages = client
         .poll_messages(
             &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
             Some(PARTITION_ID),
             &consumer,
             &PollingStrategy::offset(0),
@@ -659,7 +641,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
         .unwrap();
 
     let updated_stream = client
-        .get_stream(&Identifier::named(STREAM_NAME).unwrap())
+        .get_stream(&Identifier::named(&updated_stream_name).unwrap())
         .await
         .unwrap()
         .expect("Failed to get stream");
@@ -670,8 +652,8 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     let mut messages = create_messages();
     client
         .send_messages(
-            &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_stream_name).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
             &Partitioning::partition_id(PARTITION_ID),
             &mut messages,
         )
@@ -679,14 +661,14 @@ pub async fn run(client_factory: &dyn ClientFactory) {
         .unwrap();
 
     client
-        .purge_stream(&Identifier::named(STREAM_NAME).unwrap())
+        .purge_stream(&Identifier::named(&updated_stream_name).unwrap())
         .await
         .unwrap();
 
     let polled_messages = client
         .poll_messages(
-            &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_stream_name).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
             Some(PARTITION_ID),
             &consumer,
             &PollingStrategy::offset(0),
@@ -701,20 +683,20 @@ pub async fn run(client_factory: &dyn ClientFactory) {
     // 42. Delete the existing topic and ensure it doesn't exist anymore
     client
         .delete_topic(
-            &Identifier::named(STREAM_NAME).unwrap(),
-            &Identifier::named(TOPIC_NAME).unwrap(),
+            &Identifier::named(&updated_stream_name).unwrap(),
+            &Identifier::named(&updated_topic_name).unwrap(),
         )
         .await
         .unwrap();
     let topics = client
-        .get_topics(&Identifier::named(STREAM_NAME).unwrap())
+        .get_topics(&Identifier::named(&updated_stream_name).unwrap())
         .await
         .unwrap();
     assert!(topics.is_empty());
 
-    // 43. Create the stream with automatically generated ID on the server
+    // 43. Create the stream
     let stream_name = format!("{STREAM_NAME}-auto");
-    let stream = client.create_stream(&stream_name).await.unwrap();
+    let _ = client.create_stream(&stream_name).await.unwrap();
 
     let stream = client
         .get_stream(&Identifier::named(&stream_name).unwrap())
@@ -722,12 +704,11 @@ pub async fn run(client_factory: &dyn ClientFactory) {
         .unwrap()
         .expect("Failed to get stream");
 
-    let stream_id = stream.id;
     assert_eq!(stream.name, stream_name);
 
-    // 44. Create the topic with automatically generated ID on the server
+    // 44. Create the topic
     let topic_name = format!("{TOPIC_NAME}-auto");
-    let topic = client
+    let _ = client
         .create_topic(
             &Identifier::named(&stream_name).unwrap(),
             &topic_name,
@@ -749,7 +730,6 @@ pub async fn run(client_factory: &dyn ClientFactory) {
         .unwrap()
         .expect("Failed to get topic");
 
-    let topic_id = topic.id;
     assert_eq!(topic.name, topic_name);
 
     // 45. Delete the existing streams and ensure there's no streams left
@@ -758,7 +738,7 @@ pub async fn run(client_factory: &dyn ClientFactory) {
 
     for stream in streams {
         client
-            .delete_stream(&Identifier::numeric(stream.id).unwrap())
+            .delete_stream(&Identifier::named(&stream.name).unwrap())
             .await
             .unwrap();
     }
diff --git 
a/core/server/src/binary/handlers/consumer_groups/create_consumer_group_handler.rs
 
b/core/server/src/binary/handlers/consumer_groups/create_consumer_group_handler.rs
index 9007b6a3..9634dceb 100644
--- 
a/core/server/src/binary/handlers/consumer_groups/create_consumer_group_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_groups/create_consumer_group_handler.rs
@@ -26,13 +26,10 @@ use crate::slab::traits_ext::EntityMarker;
 use crate::state::command::EntryCommand;
 use crate::state::models::CreateConsumerGroupWithId;
 use crate::streaming::session::Session;
-use crate::streaming::topics::consumer_group2::MEMBERS_CAPACITY;
-use crate::streaming::{streams, topics};
 use anyhow::Result;
-use arcshift::ArcShift;
 use error_set::ErrContext;
-use iggy_common::IggyError;
 use iggy_common::create_consumer_group::CreateConsumerGroup;
+use iggy_common::{Identifier, IggyError};
 use std::rc::Rc;
 use tracing::{debug, instrument};
 
@@ -57,6 +54,7 @@ impl ServerCommandHandler for CreateConsumerGroup {
             self.name.clone(),
         )?;
         let cg_id = cg.id();
+
         let event = ShardEvent::CreatedConsumerGroup2 {
             stream_id: self.stream_id.clone(),
             topic_id: self.topic_id.clone(),
@@ -81,8 +79,13 @@ impl ServerCommandHandler for CreateConsumerGroup {
                     "{COMPONENT} (error: {error}) - failed to apply create 
consumer group for stream_id: {stream_id}, topic_id: {topic_id}, group_id: 
{cg_id}, session: {session}"
                 )
             })?;
-        // TODO: Fixme
-        //sender.send_ok_response(&response).await?;
+        let response = shard.streams2.with_consumer_group_by_id(
+            &stream_id,
+            &topic_id,
+            &Identifier::numeric(cg_id as u32).unwrap(),
+            |(root, members)| mapper::map_consumer_group(root, members),
+        );
+        sender.send_ok_response(&response).await?;
         Ok(())
     }
 }
diff --git 
a/core/server/src/binary/handlers/consumer_groups/delete_consumer_group_handler.rs
 
b/core/server/src/binary/handlers/consumer_groups/delete_consumer_group_handler.rs
index 04fcbdea..14d49ec2 100644
--- 
a/core/server/src/binary/handlers/consumer_groups/delete_consumer_group_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_groups/delete_consumer_group_handler.rs
@@ -52,6 +52,35 @@ impl ServerCommandHandler for DeleteConsumerGroup {
             )
         })?;
         let cg_id = cg.id();
+
+        // Remove all consumer group members from ClientManager using helper 
functions to resolve identifiers
+        let stream_id_usize = shard.streams2.with_stream_by_id(
+            &self.stream_id,
+            crate::streaming::streams::helpers::get_stream_id(),
+        );
+        let topic_id_usize = shard.streams2.with_topic_by_id(
+            &self.stream_id,
+            &self.topic_id,
+            crate::streaming::topics::helpers::get_topic_id(),
+        );
+
+        // Get members from the deleted consumer group and make them leave
+        let slab = cg.members().inner().shared_get();
+        for (_, member) in slab.iter() {
+            if let Err(err) = 
shard.client_manager.borrow_mut().leave_consumer_group(
+                member.client_id,
+                stream_id_usize,
+                topic_id_usize,
+                cg_id,
+            ) {
+                tracing::warn!(
+                    "{COMPONENT} (error: {err}) - failed to make client leave 
consumer group for client ID: {}, group ID: {}",
+                    member.client_id,
+                    cg_id
+                );
+            }
+        }
+
         let event = ShardEvent::DeletedConsumerGroup2 {
             id: cg_id,
             stream_id: self.stream_id.clone(),
diff --git 
a/core/server/src/binary/handlers/consumer_groups/join_consumer_group_handler.rs
 
b/core/server/src/binary/handlers/consumer_groups/join_consumer_group_handler.rs
index f72609c3..bca8742f 100644
--- 
a/core/server/src/binary/handlers/consumer_groups/join_consumer_group_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_groups/join_consumer_group_handler.rs
@@ -20,6 +20,7 @@ use crate::binary::command::{BinaryServerCommand, 
ServerCommand, ServerCommandHa
 use crate::binary::handlers::utils::receive_and_validate;
 use crate::binary::{handlers::consumer_groups::COMPONENT, sender::SenderKind};
 use crate::shard::IggyShard;
+use crate::shard::transmission::event::ShardEvent;
 use crate::streaming::session::Session;
 use anyhow::Result;
 use error_set::ErrContext;
@@ -55,6 +56,21 @@ impl ServerCommandHandler for JoinConsumerGroup {
                     self.stream_id, self.topic_id, self.group_id, session
                 )
             })?;
+
+        // Update ClientManager and broadcast event to other shards
+        let client_id = session.client_id;
+        let stream_id = self.stream_id.clone();
+        let topic_id = self.topic_id.clone();
+        let group_id = self.group_id.clone();
+
+        let event = ShardEvent::JoinedConsumerGroup {
+            client_id,
+            stream_id,
+            topic_id,
+            group_id,
+        };
+        let _responses = shard.broadcast_event_to_all_shards(event).await;
+
         sender.send_empty_ok_response().await?;
         Ok(())
     }
diff --git 
a/core/server/src/binary/handlers/consumer_groups/leave_consumer_group_handler.rs
 
b/core/server/src/binary/handlers/consumer_groups/leave_consumer_group_handler.rs
index 588958cc..8e795501 100644
--- 
a/core/server/src/binary/handlers/consumer_groups/leave_consumer_group_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_groups/leave_consumer_group_handler.rs
@@ -21,6 +21,7 @@ use crate::binary::command::{BinaryServerCommand, 
ServerCommand, ServerCommandHa
 use crate::binary::handlers::utils::receive_and_validate;
 use crate::binary::sender::SenderKind;
 use crate::shard::IggyShard;
+use crate::shard::transmission::event::ShardEvent;
 use crate::streaming::session::Session;
 use anyhow::Result;
 use error_set::ErrContext;
@@ -57,6 +58,21 @@ impl ServerCommandHandler for LeaveConsumerGroup {
                     self.stream_id, self.topic_id, self.group_id, session
                 )
             })?;
+
+        // Update ClientManager and broadcast event to other shards
+        let client_id = session.client_id;
+        let stream_id = self.stream_id.clone();
+        let topic_id = self.topic_id.clone();
+        let group_id = self.group_id.clone();
+
+        let event = ShardEvent::LeftConsumerGroup {
+            client_id,
+            stream_id,
+            topic_id,
+            group_id,
+        };
+        let _responses = shard.broadcast_event_to_all_shards(event).await;
+
         sender.send_empty_ok_response().await?;
         Ok(())
     }
diff --git 
a/core/server/src/binary/handlers/consumer_offsets/delete_consumer_offset_handler.rs
 
b/core/server/src/binary/handlers/consumer_offsets/delete_consumer_offset_handler.rs
index e2514078..9458861d 100644
--- 
a/core/server/src/binary/handlers/consumer_offsets/delete_consumer_offset_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_offsets/delete_consumer_offset_handler.rs
@@ -55,13 +55,13 @@ impl ServerCommandHandler for DeleteConsumerOffset {
             .with_error_context(|error| format!("{COMPONENT} (error: {error}) 
- failed to delete consumer offset for topic with ID: {} in stream with ID: {} 
partition ID: {:#?}, session: {}",
                 self.topic_id, self.stream_id, self.partition_id, session
             ))?;
+        // TODO: Get rid of this event.
         let event = ShardEvent::DeletedOffset {
             stream_id: self.stream_id,
             topic_id: self.topic_id,
             partition_id,
             polling_consumer,
         };
-        let _responses = shard.broadcast_event_to_all_shards(event).await;
         sender.send_empty_ok_response().await?;
         Ok(())
     }
diff --git 
a/core/server/src/binary/handlers/consumer_offsets/store_consumer_offset_handler.rs
 
b/core/server/src/binary/handlers/consumer_offsets/store_consumer_offset_handler.rs
index 6075d973..85eb95cd 100644
--- 
a/core/server/src/binary/handlers/consumer_offsets/store_consumer_offset_handler.rs
+++ 
b/core/server/src/binary/handlers/consumer_offsets/store_consumer_offset_handler.rs
@@ -57,6 +57,7 @@ impl ServerCommandHandler for StoreConsumerOffset {
             .with_error_context(|error| format!("{COMPONENT} (error: {error}) 
- failed to store consumer offset for stream_id: {}, topic_id: {}, 
partition_id: {:?}, offset: {}, session: {}",
                 self.stream_id, self.topic_id, self.partition_id, self.offset, 
session
             ))?;
+        // TODO: Get rid of this event.
         let event = ShardEvent::StoredOffset {
             stream_id: self.stream_id,
             topic_id: self.topic_id,
@@ -64,7 +65,6 @@ impl ServerCommandHandler for StoreConsumerOffset {
             polling_consumer,
             offset: self.offset,
         };
-        let _responses = shard.broadcast_event_to_all_shards(event).await;
         sender.send_empty_ok_response().await?;
         Ok(())
     }
diff --git 
a/core/server/src/binary/handlers/personal_access_tokens/login_with_personal_access_token_handler.rs
 
b/core/server/src/binary/handlers/personal_access_tokens/login_with_personal_access_token_handler.rs
index 00d4b295..e7ecc33f 100644
--- 
a/core/server/src/binary/handlers/personal_access_tokens/login_with_personal_access_token_handler.rs
+++ 
b/core/server/src/binary/handlers/personal_access_tokens/login_with_personal_access_token_handler.rs
@@ -1,3 +1,4 @@
+use crate::shard::transmission::event::ShardEvent;
 /* Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
@@ -55,6 +56,11 @@ impl ServerCommandHandler for LoginWithPersonalAccessToken {
                     "{COMPONENT} (error: {error}) - failed to login with 
personal access token: {redacted_token}, session: {session}",
                 )
             })?;
+        let event = ShardEvent::LoginWithPersonalAccessToken {
+            token: self.token,
+            client_id: session.client_id,
+        };
+        let _responses = shard.broadcast_event_to_all_shards(event).await;
         let identity_info = mapper::map_identity_info(user.id);
         sender.send_ok_response(&identity_info).await?;
         Ok(())
diff --git 
a/core/server/src/binary/handlers/segments/delete_segments_handler.rs 
b/core/server/src/binary/handlers/segments/delete_segments_handler.rs
index b3eef13b..ef74b11f 100644
--- a/core/server/src/binary/handlers/segments/delete_segments_handler.rs
+++ b/core/server/src/binary/handlers/segments/delete_segments_handler.rs
@@ -20,6 +20,7 @@ use crate::binary::command::{BinaryServerCommand, 
ServerCommand, ServerCommandHa
 use crate::binary::handlers::utils::receive_and_validate;
 use crate::binary::{handlers::partitions::COMPONENT, sender::SenderKind};
 use crate::shard::IggyShard;
+use crate::shard::transmission::event::ShardEvent;
 use crate::state::command::EntryCommand;
 use crate::streaming::session::Session;
 use anyhow::Result;
@@ -52,7 +53,7 @@ impl ServerCommandHandler for DeleteSegments {
                 session,
                 &self.stream_id,
                 &self.topic_id,
-                self.partition_id,
+                self.partition_id as usize,
                 self.segments_count,
             )
             .await
@@ -61,6 +62,13 @@ impl ServerCommandHandler for DeleteSegments {
                     "{COMPONENT} (error: {error}) - failed to delete segments 
for topic with ID: {topic_id} in stream with ID: {stream_id}, session: 
{session}",
                 )
             })?;
+        let event = ShardEvent::DeletedSegments {
+            stream_id: self.stream_id.clone(),
+            topic_id: self.topic_id.clone(),
+            partition_id: self.partition_id as usize,
+            segments_count: self.segments_count,
+        };
+        let _responses = 
shard.broadcast_event_to_all_shards(event.into()).await;
 
         shard
             .state
diff --git a/core/server/src/binary/handlers/streams/delete_stream_handler.rs 
b/core/server/src/binary/handlers/streams/delete_stream_handler.rs
index 88ade486..f59b11b5 100644
--- a/core/server/src/binary/handlers/streams/delete_stream_handler.rs
+++ b/core/server/src/binary/handlers/streams/delete_stream_handler.rs
@@ -60,14 +60,12 @@ impl ServerCommandHandler for DeleteStream {
             stream2.root().name(),
             stream2.id()
         );
+
         let event = ShardEvent::DeletedStream2 {
             id: stream2.id(),
             stream_id: self.stream_id.clone(),
         };
         let _responses = shard.broadcast_event_to_all_shards(event).await;
-        // Drop the stream to force readers/writers to be dropped.
-        drop(stream2);
-        // Stream files and directories have been deleted by 
delete_stream_from_disk
 
         shard
             .state
diff --git a/core/server/src/binary/handlers/topics/delete_topic_handler.rs 
b/core/server/src/binary/handlers/topics/delete_topic_handler.rs
index 592119f0..c589d5ea 100644
--- a/core/server/src/binary/handlers/topics/delete_topic_handler.rs
+++ b/core/server/src/binary/handlers/topics/delete_topic_handler.rs
@@ -65,13 +65,13 @@ impl ServerCommandHandler for DeleteTopic {
             topic_id,
             stream_id
         );
+
         let event = ShardEvent::DeletedTopic2 {
             id: topic_id,
             stream_id: self.stream_id.clone(),
             topic_id: self.topic_id.clone(),
         };
         let _responses = 
shard.broadcast_event_to_all_shards(event.into()).await;
-        // TODO: Remove all the files and directories.
 
         shard
             .state
diff --git a/core/server/src/binary/handlers/topics/get_topic_handler.rs 
b/core/server/src/binary/handlers/topics/get_topic_handler.rs
index 48a49201..653ce995 100644
--- a/core/server/src/binary/handlers/topics/get_topic_handler.rs
+++ b/core/server/src/binary/handlers/topics/get_topic_handler.rs
@@ -51,7 +51,7 @@ impl ServerCommandHandler for GetTopic {
             session.get_user_id(),
             numeric_stream_id as u32,
             self.topic_id.get_u32_value().unwrap_or(0),
-        );
+        )?;
 
         shard
             .streams2
diff --git a/core/server/src/binary/handlers/topics/update_topic_handler.rs 
b/core/server/src/binary/handlers/topics/update_topic_handler.rs
index 8a5e7595..f37990ac 100644
--- a/core/server/src/binary/handlers/topics/update_topic_handler.rs
+++ b/core/server/src/binary/handlers/topics/update_topic_handler.rs
@@ -26,8 +26,8 @@ use crate::streaming::session::Session;
 use crate::streaming::topics;
 use anyhow::Result;
 use error_set::ErrContext;
-use iggy_common::IggyError;
 use iggy_common::update_topic::UpdateTopic;
+use iggy_common::{Identifier, IggyError};
 use std::rc::Rc;
 use tracing::{debug, instrument};
 
@@ -45,6 +45,7 @@ impl ServerCommandHandler for UpdateTopic {
         shard: &Rc<IggyShard>,
     ) -> Result<(), IggyError> {
         debug!("session: {session}, command: {self}");
+        let name_changed = !self.name.is_empty();
         shard.update_topic2(
             session,
             &self.stream_id,
@@ -54,15 +55,21 @@ impl ServerCommandHandler for UpdateTopic {
             self.compression_algorithm,
             self.max_topic_size,
             self.replication_factor,
-        );
+        )?;
+        // TODO: Tech debt.
+        let topic_id = if name_changed {
+            Identifier::named(&self.name.clone()).unwrap()
+        } else {
+            self.topic_id.clone()
+        };
         self.message_expiry = shard.streams2.with_topic_by_id(
             &self.stream_id,
-            &self.topic_id,
+            &topic_id,
             topics::helpers::get_message_expiry(),
         );
         self.max_topic_size = shard.streams2.with_topic_by_id(
             &self.stream_id,
-            &self.topic_id,
+            &topic_id,
             topics::helpers::get_max_topic_size(),
         );
         let event = ShardEvent::UpdatedTopic2 {
diff --git a/core/server/src/binary/handlers/users/create_user_handler.rs 
b/core/server/src/binary/handlers/users/create_user_handler.rs
index 7ca1a82e..0837a794 100644
--- a/core/server/src/binary/handlers/users/create_user_handler.rs
+++ b/core/server/src/binary/handlers/users/create_user_handler.rs
@@ -72,6 +72,7 @@ impl ServerCommandHandler for CreateUser {
             user.id
         );
         let event = ShardEvent::CreatedUser {
+            user_id: user.id,
             username: self.username.to_owned(),
             password: self.password.to_owned(),
             status: self.status,
diff --git a/core/server/src/binary/mapper.rs b/core/server/src/binary/mapper.rs
index fa933aa4..64f80dfb 100644
--- a/core/server/src/binary/mapper.rs
+++ b/core/server/src/binary/mapper.rs
@@ -167,6 +167,16 @@ pub fn map_streams(roots: &Slab<stream2::StreamRoot>, 
stats: &Slab<Arc<StreamSta
 pub fn map_stream(root: &stream2::StreamRoot, stats: &StreamStats) -> Bytes {
     let mut bytes = BytesMut::new();
     extend_stream(root, stats, &mut bytes);
+    root.topics().with_components(|topics| {
+        let (roots, _, stats, ..) = topics.into_components();
+        for (root, stat) in roots
+            .iter()
+            .map(|(_, val)| val)
+            .zip(stats.iter().map(|(_, val)| val))
+        {
+            extend_topic(&root, &stat, &mut bytes);
+        }
+    });
     bytes.freeze()
 }
 
diff --git a/core/server/src/shard/mod.rs b/core/server/src/shard/mod.rs
index 4771d238..5d3e6186 100644
--- a/core/server/src/shard/mod.rs
+++ b/core/server/src/shard/mod.rs
@@ -32,7 +32,7 @@ use error_set::ErrContext;
 use futures::future::try_join_all;
 use hash32::{Hasher, Murmur3Hasher};
 use iggy_common::{
-    EncryptorKind, Identifier, IggyError, IggyTimestamp, Permissions, 
PollingKind, UserId,
+    EncryptorKind, IdKind, Identifier, IggyError, IggyTimestamp, Permissions, 
PollingKind, UserId,
     UserStatus,
     defaults::{DEFAULT_ROOT_PASSWORD, DEFAULT_ROOT_USERNAME},
     locking::IggyRwLockFn,
@@ -181,62 +181,6 @@ impl IggyShard {
         Default::default()
     }
 
-    pub fn default_from_config(server_config: ServerConfig) -> Self {
-        use crate::bootstrap::resolve_persister;
-        use crate::streaming::storage::SystemStorage;
-        use crate::versioning::SemanticVersion;
-
-        let version = SemanticVersion::current().expect("Invalid version");
-        let persister = 
resolve_persister(server_config.system.partition.enforce_fsync);
-        let storage = Rc::new(SystemStorage::new(
-            server_config.system.clone(),
-            persister.clone(),
-        ));
-
-        let (stop_sender, stop_receiver) = async_channel::unbounded();
-
-        let state_path = server_config.system.get_state_messages_file_path();
-        let file_state = FileState::new(&state_path, &version, persister, 
None);
-        let state = crate::state::StateKind::File(file_state);
-        let shards_table = Box::new(DashMap::new());
-        let shards_table = Box::leak(shards_table);
-
-        let shard = Self {
-            id: 0,
-            shards: Vec::new(),
-            shards_table: shards_table.into(),
-            version,
-            streams2: Default::default(),
-            state,
-            storage,
-            //TODO: Fix
-            encryptor: None,
-            config: server_config,
-            client_manager: Default::default(),
-            active_sessions: Default::default(),
-            permissioner: Default::default(),
-            users: Default::default(),
-            metrics: Metrics::init(),
-            messages_receiver: Cell::new(None),
-            stop_receiver,
-            stop_sender,
-            task_registry: TaskRegistry::new(),
-            is_shutting_down: AtomicBool::new(false),
-            tcp_bound_address: Cell::new(None),
-            quic_bound_address: Cell::new(None),
-        };
-        let user = User::root(DEFAULT_ROOT_USERNAME, DEFAULT_ROOT_PASSWORD);
-        shard
-            .create_user_bypass_auth(
-                &user.username,
-                &user.password,
-                UserStatus::Active,
-                Some(Permissions::root()),
-            )
-            .unwrap();
-        shard
-    }
-
     pub async fn init(&self) -> Result<(), IggyError> {
         self.load_segments().await?;
         let _ = self.load_users().await;
@@ -691,6 +635,10 @@ impl IggyShard {
                 username,
                 password,
             } => self.login_user_event(client_id, &username, &password),
+            ShardEvent::LoginWithPersonalAccessToken { client_id, token } => {
+                self.login_user_pat_event(&token, client_id)?;
+                Ok(())
+            }
             ShardEvent::NewSession { address, transport } => {
                 let session = self.add_client(&address, transport);
                 self.add_active_session(session);
@@ -715,22 +663,30 @@ impl IggyShard {
                 Ok(())
             }
             ShardEvent::PurgedStream2 { stream_id } => {
-                self.purge_stream2_bypass_auth(&stream_id)?;
+                self.purge_stream2_bypass_auth(&stream_id).await?;
                 Ok(())
             }
             ShardEvent::PurgedTopic {
                 stream_id,
                 topic_id,
             } => {
-                todo!();
+                self.purge_topic2_bypass_auth(&stream_id, &topic_id).await?;
+                Ok(())
             }
             ShardEvent::CreatedUser {
+                user_id,
                 username,
                 password,
                 status,
                 permissions,
             } => {
-                self.create_user_bypass_auth(&username, &password, status, 
permissions.clone())?;
+                self.create_user_bypass_auth(
+                    user_id,
+                    &username,
+                    &password,
+                    status,
+                    permissions.clone(),
+                )?;
                 Ok(())
             }
             ShardEvent::DeletedUser { user_id } => {
@@ -741,8 +697,6 @@ impl IggyShard {
                 let sessions = self.active_sessions.borrow();
                 let session = sessions.iter().find(|s| s.client_id == 
client_id).unwrap();
                 self.logout_user(session)?;
-                self.remove_active_session(session.get_user_id());
-
                 Ok(())
             }
             ShardEvent::ChangedPassword {
@@ -763,7 +717,6 @@ impl IggyShard {
                 self.delete_personal_access_token_bypass_auth(user_id, &name)?;
                 Ok(())
             }
-            ShardEvent::LoginWithPersonalAccessToken { token: _ } => todo!(),
             ShardEvent::UpdatedUser {
                 user_id,
                 username,
@@ -792,6 +745,12 @@ impl IggyShard {
             ShardEvent::DeletedStream2 { id, stream_id } => {
                 let stream = self.delete_stream2_bypass_auth(&stream_id);
                 assert_eq!(stream.id(), id);
+
+                // Clean up consumer groups from ClientManager for this stream
+                self.client_manager
+                    .borrow_mut()
+                    .delete_consumer_groups_for_stream(id);
+
                 Ok(())
             }
             ShardEvent::CreatedTopic2 { stream_id, topic } => {
@@ -814,6 +773,16 @@ impl IggyShard {
             } => {
                 let topic = self.delete_topic_bypass_auth2(&stream_id, 
&topic_id);
                 assert_eq!(topic.id(), id);
+
+                // Clean up consumer groups from ClientManager for this topic 
using helper functions
+                let stream_id_usize = self.streams2.with_stream_by_id(
+                    &stream_id,
+                    crate::streaming::streams::helpers::get_stream_id(),
+                );
+                self.client_manager
+                    .borrow_mut()
+                    .delete_consumer_groups_for_topic(stream_id_usize, id);
+
                 Ok(())
             }
             ShardEvent::UpdatedTopic2 {
@@ -854,6 +823,36 @@ impl IggyShard {
             } => {
                 let cg = self.delete_consumer_group_bypass_auth2(&stream_id, 
&topic_id, &group_id);
                 assert_eq!(cg.id(), id);
+
+                // Remove all consumer group members from ClientManager using 
helper functions
+                let stream_id_usize = self.streams2.with_stream_by_id(
+                    &stream_id,
+                    crate::streaming::streams::helpers::get_stream_id(),
+                );
+                let topic_id_usize = self.streams2.with_topic_by_id(
+                    &stream_id,
+                    &topic_id,
+                    crate::streaming::topics::helpers::get_topic_id(),
+                );
+
+                // Get members from the deleted consumer group and make them 
leave
+                let slab = cg.members().inner().shared_get();
+                for (_, member) in slab.iter() {
+                    if let Err(err) = 
self.client_manager.borrow_mut().leave_consumer_group(
+                        member.client_id,
+                        stream_id_usize,
+                        topic_id_usize,
+                        id,
+                    ) {
+                        tracing::warn!(
+                            "Shard {} (error: {err}) - failed to make client 
leave consumer group for client ID: {}, group ID: {}",
+                            self.id,
+                            member.client_id,
+                            id
+                        );
+                    }
+                }
+
                 Ok(())
             }
             ShardEvent::StoredOffset {
@@ -877,13 +876,82 @@ impl IggyShard {
                 topic_id,
                 partition_id,
                 polling_consumer,
+            } => Ok(()),
+            ShardEvent::JoinedConsumerGroup {
+                client_id,
+                stream_id,
+                topic_id,
+                group_id,
+            } => {
+                // Convert Identifiers to usizes for ClientManager using 
helper functions
+                let stream_id_usize = self.streams2.with_stream_by_id(
+                    &stream_id,
+                    crate::streaming::streams::helpers::get_stream_id(),
+                );
+                let topic_id_usize = self.streams2.with_topic_by_id(
+                    &stream_id,
+                    &topic_id,
+                    crate::streaming::topics::helpers::get_topic_id(),
+                );
+                let group_id_usize = self.streams2.with_consumer_group_by_id(
+                    &stream_id,
+                    &topic_id,
+                    &group_id,
+                    crate::streaming::topics::helpers::get_consumer_group_id(),
+                );
+
+                self.client_manager.borrow_mut().join_consumer_group(
+                    client_id,
+                    stream_id_usize,
+                    topic_id_usize,
+                    group_id_usize,
+                )?;
+                Ok(())
+            }
+            ShardEvent::LeftConsumerGroup {
+                client_id,
+                stream_id,
+                topic_id,
+                group_id,
+            } => {
+                // Convert Identifiers to usizes for ClientManager using 
helper functions
+                let stream_id_usize = self.streams2.with_stream_by_id(
+                    &stream_id,
+                    crate::streaming::streams::helpers::get_stream_id(),
+                );
+                let topic_id_usize = self.streams2.with_topic_by_id(
+                    &stream_id,
+                    &topic_id,
+                    crate::streaming::topics::helpers::get_topic_id(),
+                );
+                let group_id_usize = self.streams2.with_consumer_group_by_id(
+                    &stream_id,
+                    &topic_id,
+                    &group_id,
+                    crate::streaming::topics::helpers::get_consumer_group_id(),
+                );
+
+                self.client_manager.borrow_mut().leave_consumer_group(
+                    client_id,
+                    stream_id_usize,
+                    topic_id_usize,
+                    group_id_usize,
+                )?;
+                Ok(())
+            }
+            ShardEvent::DeletedSegments {
+                stream_id,
+                topic_id,
+                partition_id,
+                segments_count,
             } => {
-                self.delete_consumer_offset_bypass_auth(
+                self.delete_segments_bypass_auth(
                     &stream_id,
                     &topic_id,
-                    &polling_consumer,
                     partition_id,
-                )?;
+                    segments_count,
+                )
+                .await?;
                 Ok(())
             }
         }
@@ -945,6 +1013,7 @@ impl IggyShard {
                         | ShardEvent::CreatedPartitions2 { .. }
                         | ShardEvent::DeletedPartitions2 { .. }
                         | ShardEvent::CreatedConsumerGroup2 { .. }
+                        | ShardEvent::CreatedPersonalAccessToken { .. }
                         | ShardEvent::DeletedConsumerGroup2 { .. }
                 ) {
                     let (sender, receiver) = async_channel::bounded(1);
diff --git a/core/server/src/shard/system/consumer_groups.rs 
b/core/server/src/shard/system/consumer_groups.rs
index 1e6d7fe3..e3e254fb 100644
--- a/core/server/src/shard/system/consumer_groups.rs
+++ b/core/server/src/shard/system/consumer_groups.rs
@@ -140,12 +140,34 @@ impl IggyShard {
         topic_id: &Identifier,
         group_id: &Identifier,
     ) -> consumer_group2::ConsumerGroup {
-        self.streams2.with_consumer_groups_mut(
+        // Get numeric IDs before deletion for ClientManager cleanup
+        let stream_id_value = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_stream_id());
+        let topic_id_value =
+            self.streams2
+                .with_topic_by_id(stream_id, topic_id, 
topics::helpers::get_topic_id());
+        let group_id_value = self.streams2.with_consumer_group_by_id(
+            stream_id,
+            topic_id,
+            group_id,
+            topics::helpers::get_consumer_group_id(),
+        );
+
+        let cg = self.streams2.with_consumer_groups_mut(
             stream_id,
             topic_id,
             topics::helpers::delete_consumer_group(group_id),
-        )
-        // TODO: remove from the consumer_group
+        );
+
+        // Clean up ClientManager state
+        self.client_manager.borrow_mut().delete_consumer_group(
+            stream_id_value,
+            topic_id_value,
+            group_id_value,
+        );
+
+        cg
     }
 
     pub fn join_consumer_group(
@@ -180,16 +202,32 @@ impl IggyShard {
             topics::helpers::join_consumer_group(self.id, client_id),
         );
 
-        // TODO:
-        /*
-        
self.client_manager.borrow_mut().join_consumer_group(session.client_id, 
stream_id_value, topic_id_value, group_id)
-            .with_error_context(|error| {
-                format!(
-                    "{COMPONENT} (error: {error}) - failed to make client join 
consumer group for client ID: {}",
-                    session.client_id
-                )
-            })?;
-            */
+        // Update ClientManager state
+        let stream_id_value = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_stream_id());
+        let topic_id_value =
+            self.streams2
+                .with_topic_by_id(stream_id, topic_id, 
topics::helpers::get_topic_id());
+        let group_id_value = self.streams2.with_consumer_group_by_id(
+            stream_id,
+            topic_id,
+            group_id,
+            topics::helpers::get_consumer_group_id(),
+        );
+
+        self.client_manager.borrow_mut().join_consumer_group(
+            session.client_id,
+            stream_id_value,
+            topic_id_value,
+            group_id_value,
+        )
+        .with_error_context(|error| {
+            format!(
+                "{COMPONENT} (error: {error}) - failed to make client join 
consumer group for client ID: {}",
+                session.client_id
+            )
+        })?;
         Ok(())
     }
 
@@ -223,8 +261,26 @@ impl IggyShard {
             topics::helpers::leave_consumer_group(self.id, session.client_id),
         );
 
-        // TODO:
-        // self.leave_consumer_group_by_client();
+        // Update ClientManager state
+        let stream_id_value = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_stream_id());
+        let topic_id_value =
+            self.streams2
+                .with_topic_by_id(stream_id, topic_id, 
topics::helpers::get_topic_id());
+        let group_id_value = self.streams2.with_consumer_group_by_id(
+            stream_id,
+            topic_id,
+            group_id,
+            topics::helpers::get_consumer_group_id(),
+        );
+
+        self.client_manager.borrow_mut().leave_consumer_group(
+            session.client_id,
+            stream_id_value,
+            topic_id_value,
+            group_id_value,
+        ).with_error_context(|error| format!("{COMPONENT} (error: {error}) - 
failed to make client leave consumer group for client ID: {}", 
session.client_id))?;
         Ok(())
     }
 
@@ -235,15 +291,26 @@ impl IggyShard {
         group_id: &Identifier,
         client_id: u32,
     ) -> Result<(), IggyError> {
-        // TODO:
-        /*
+        // Update ClientManager state
+        let stream_id_value = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_stream_id());
+        let topic_id_value =
+            self.streams2
+                .with_topic_by_id(stream_id, topic_id, 
topics::helpers::get_topic_id());
+        let group_id_value = self.streams2.with_consumer_group_by_id(
+            stream_id,
+            topic_id,
+            group_id,
+            topics::helpers::get_consumer_group_id(),
+        );
+
         self.client_manager.borrow_mut().leave_consumer_group(
             client_id,
             stream_id_value,
             topic_id_value,
-            group_id,
-        )
-        */
+            group_id_value,
+        ).with_error_context(|error| format!("{COMPONENT} (error: {error}) - 
failed to make client leave consumer group for client ID: {}", client_id))?;
         Ok(())
     }
 }
diff --git a/core/server/src/shard/system/consumer_offsets.rs 
b/core/server/src/shard/system/consumer_offsets.rs
index 1ccd1475..5e4f4ff5 100644
--- a/core/server/src/shard/system/consumer_offsets.rs
+++ b/core/server/src/shard/system/consumer_offsets.rs
@@ -179,9 +179,9 @@ impl IggyShard {
             return Err(IggyError::NotResolvedConsumer(consumer.id));
         };
 
-        self.delete_consumer_offset_base(stream_id, topic_id, 
&polling_consumer, partition_id)?;
-        self.delete_consumer_offset_from_disk(stream_id, topic_id, 
&polling_consumer, partition_id)
-            .await?;
+        let path =
+            self.delete_consumer_offset_base(stream_id, topic_id, 
&polling_consumer, partition_id)?;
+        self.delete_consumer_offset_from_disk(&path).await?;
         Ok((polling_consumer, partition_id))
     }
 
@@ -193,6 +193,7 @@ impl IggyShard {
         partition_id: usize,
         offset: u64,
     ) {
+        // TODO: This can use `with_partition_by_id` directly.
         match polling_consumer {
             PollingConsumer::Consumer(id, _) => {
                 self.streams2.with_stream_by_id(
@@ -227,7 +228,7 @@ impl IggyShard {
         topic_id: &Identifier,
         polling_consumer: &PollingConsumer,
         partition_id: usize,
-    ) -> Result<(), IggyError> {
+    ) -> Result<String, IggyError> {
         match polling_consumer {
             PollingConsumer::Consumer(id, _) => {
                 self.streams2
@@ -235,7 +236,7 @@ impl IggyShard {
                         format!(
                             "{COMPONENT} (error: {error}) - failed to delete 
consumer offset for consumer with ID: {id} in topic with ID: {topic_id} and 
stream with ID: {stream_id}",
                         )
-                    })?;
+                    })
             }
             PollingConsumer::ConsumerGroup(_, id) => {
                 self.streams2
@@ -243,10 +244,9 @@ impl IggyShard {
                         format!(
                             "{COMPONENT} (error: {error}) - failed to delete 
consumer group member offset for member with ID: {id} in topic with ID: 
{topic_id} and stream with ID: {stream_id}",
                         )
-                    })?;
+                    })
             }
         }
-        Ok(())
     }
 
     async fn persist_consumer_offset_to_disk(
@@ -282,37 +282,8 @@ impl IggyShard {
         }
     }
 
-    async fn delete_consumer_offset_from_disk(
-        &self,
-        stream_id: &Identifier,
-        topic_id: &Identifier,
-        polling_consumer: &PollingConsumer,
-        partition_id: usize,
-    ) -> Result<(), IggyError> {
-        match polling_consumer {
-            PollingConsumer::Consumer(id, _) => {
-                self.streams2
-                    .with_partition_by_id_async(
-                        stream_id,
-                        topic_id,
-                        partition_id,
-                        
partitions::helpers::delete_consumer_offset_from_disk(self.id, *id),
-                    )
-                    .await
-            }
-            PollingConsumer::ConsumerGroup(_, id) => {
-                self.streams2
-                    .with_partition_by_id_async(
-                        stream_id,
-                        topic_id,
-                        partition_id,
-                        
partitions::helpers::delete_consumer_group_member_offset_from_disk(
-                            self.id, *id,
-                        ),
-                    )
-                    .await
-            }
-        }
+    pub async fn delete_consumer_offset_from_disk(&self, path: &str) -> 
Result<(), IggyError> {
+        partitions::storage2::delete_persisted_offset(self.id, path).await
     }
 
     pub fn store_consumer_offset_bypass_auth(
@@ -331,14 +302,4 @@ impl IggyShard {
             offset,
         );
     }
-
-    pub fn delete_consumer_offset_bypass_auth(
-        &self,
-        stream_id: &Identifier,
-        topic_id: &Identifier,
-        polling_consumer: &PollingConsumer,
-        partition_id: usize,
-    ) -> Result<(), IggyError> {
-        self.delete_consumer_offset_base(stream_id, topic_id, 
polling_consumer, partition_id)
-    }
 }
diff --git a/core/server/src/shard/system/partitions.rs 
b/core/server/src/shard/system/partitions.rs
index 05c0c74c..d78192f0 100644
--- a/core/server/src/shard/system/partitions.rs
+++ b/core/server/src/shard/system/partitions.rs
@@ -22,6 +22,7 @@ use crate::shard::ShardInfo;
 use crate::shard::calculate_shard_assignment;
 use crate::shard::namespace::IggyNamespace;
 use crate::shard_info;
+use crate::slab::traits_ext::EntityComponentSystem;
 use crate::slab::traits_ext::EntityMarker;
 use crate::slab::traits_ext::IntoComponents;
 use crate::streaming::partitions;
@@ -105,16 +106,12 @@ impl IggyShard {
             partitions_count,
             &self.config.system,
         );
-        let stats = partitions.first().map(|p| p.stats());
-        if let Some(stats) = stats {
-            // One segment per partition created.
-            stats.increment_segments_count(partitions_count);
-        }
+
         self.metrics.increment_partitions(partitions_count);
         self.metrics.increment_segments(partitions_count);
 
         let shards_count = self.get_available_shards_count();
-        for partition_id in partitions.iter().map(|p| p.id()) {
+        for (partition_id, stats) in partitions.iter().map(|p| (p.id(), 
p.stats())) {
             // TODO: Create shard table recordsj.
             let ns = IggyNamespace::new(numeric_stream_id, numeric_topic_id, 
partition_id);
             let shard_id = calculate_shard_assignment(&ns, shards_count);
@@ -130,6 +127,7 @@ impl IggyShard {
                 &self.config.system,
             )
             .await?;
+            stats.increment_segments_count(1);
             if is_current_shard {
                 self.init_log(stream_id, topic_id, partition_id).await?;
             }
@@ -137,7 +135,7 @@ impl IggyShard {
         Ok(partitions)
     }
 
-    async fn init_log(
+    pub async fn init_log(
         &self,
         stream_id: &Identifier,
         topic_id: &Identifier,
@@ -233,6 +231,7 @@ impl IggyShard {
                 self.init_log(stream_id, topic_id, id).await?;
             }
         }
+
         Ok(())
     }
 
diff --git a/core/server/src/shard/system/personal_access_tokens.rs 
b/core/server/src/shard/system/personal_access_tokens.rs
index 526063b6..62322e5e 100644
--- a/core/server/src/shard/system/personal_access_tokens.rs
+++ b/core/server/src/shard/system/personal_access_tokens.rs
@@ -100,7 +100,7 @@ impl IggyShard {
         let token_hash = personal_access_token.token.clone();
         let identifier = user_id.try_into()?;
         let user = self.get_user_mut(&identifier).with_error_context(|error| {
-            format!("{COMPONENT} (error: {error}) - failed to get mutable 
reference to the user with id: {user_id}")
+            format!("{COMPONENT} create PAT (error: {error}) - failed to get 
mutable reference to the user with id: {user_id}")
         })?;
 
         if user
@@ -145,7 +145,7 @@ impl IggyShard {
             .get_user_mut(&user_id.try_into()?)
             .with_error_context(|error| {
                 format!(
-                    "{COMPONENT} (error: {error}) - failed to get mutable 
reference to the user with id: {user_id}"
+                    "{COMPONENT} delete PAT (error: {error}) - failed to get 
mutable reference to the user with id: {user_id}"
                 )
             })?;
 
@@ -166,6 +166,16 @@ impl IggyShard {
         Ok(())
     }
 
+    pub fn login_user_pat_event(&self, token: &str, client_id: u32) -> 
Result<(), IggyError> {
+        let active_sessions = self.active_sessions.borrow();
+        let session = active_sessions
+            .iter()
+            .find(|s| s.client_id == client_id)
+            .expect(format!("At this point session for {}, should exist.", 
client_id).as_str());
+        self.login_with_personal_access_token(token, Some(session))?;
+        Ok(())
+    }
+
     pub fn login_with_personal_access_token(
         &self,
         token: &str,
diff --git a/core/server/src/shard/system/segments.rs 
b/core/server/src/shard/system/segments.rs
index 5b7d69ff..c9a59254 100644
--- a/core/server/src/shard/system/segments.rs
+++ b/core/server/src/shard/system/segments.rs
@@ -1,4 +1,7 @@
+use std::error;
+
 use crate::shard::IggyShard;
+use crate::streaming;
 /* Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
@@ -16,24 +19,108 @@ use crate::shard::IggyShard;
  * specific language governing permissions and limitations
  * under the License.
  */
-use super::COMPONENT;
 use crate::streaming::session::Session;
-use error_set::ErrContext;
 use iggy_common::Identifier;
 use iggy_common::IggyError;
-use iggy_common::locking::IggyRwLockFn;
 
 impl IggyShard {
+    pub async fn delete_segments_bypass_auth(
+        &self,
+        stream_id: &Identifier,
+        topic_id: &Identifier,
+        partition_id: usize,
+        segments_count: u32,
+    ) -> Result<(), IggyError> {
+        self.delete_segments_base(stream_id, topic_id, partition_id, 
segments_count)
+            .await
+    }
+
+    pub async fn delete_segments_base(
+        &self,
+        stream_id: &Identifier,
+        topic_id: &Identifier,
+        partition_id: usize,
+        segments_count: u32,
+    ) -> Result<(), IggyError> {
+        let (segments, storages) = self.streams2.with_partition_by_id_mut(
+            stream_id,
+            topic_id,
+            partition_id,
+            |(.., log)| {
+                let upperbound = log.segments().len();
+                let begin = upperbound.saturating_sub(segments_count as usize);
+                let segments = log
+                    .segments_mut()
+                    .drain(begin..upperbound)
+                    .collect::<Vec<_>>();
+                let storages = log
+                    .storages_mut()
+                    .drain(begin..upperbound)
+                    .collect::<Vec<_>>();
+                let _ = log
+                    .indexes_mut()
+                    .drain(begin..upperbound)
+                    .collect::<Vec<_>>();
+                (segments, storages)
+            },
+        );
+        let numeric_stream_id = self
+            .streams2
+            .with_stream_by_id(stream_id, 
streaming::streams::helpers::get_stream_id());
+        let numeric_topic_id = self.streams2.with_topic_by_id(
+            stream_id,
+            topic_id,
+            streaming::topics::helpers::get_topic_id(),
+        );
+
+        let create_base_segment = segments.len() > 0 && storages.len() > 0;
+        for (mut storage, segment) in 
storages.into_iter().zip(segments.into_iter()) {
+            let (msg_writer, index_writer) = storage.shutdown();
+            if let Some(msg_writer) = msg_writer
+                && let Some(index_writer) = index_writer
+            {
+                // We need to fsync before closing to ensure all data is 
written to disk.
+                msg_writer.fsync().await?;
+                index_writer.fsync().await?;
+                let path = msg_writer.path();
+                drop(msg_writer);
+                drop(index_writer);
+                compio::fs::remove_file(&path).await.map_err(|_| {
+                    tracing::error!("Failed to delete segment file at path: 
{}", path);
+                    IggyError::CannotDeleteFile
+                })?;
+            } else {
+                let start_offset = segment.start_offset;
+                let path = self.config.system.get_segment_path(
+                    numeric_stream_id,
+                    numeric_topic_id,
+                    partition_id,
+                    start_offset,
+                );
+                compio::fs::remove_file(&path).await.map_err(|_| {
+                    tracing::error!("Failed to delete segment file at path: 
{}", path);
+                    IggyError::CannotDeleteFile
+                })?;
+            }
+        }
+
+        if create_base_segment {
+            self.init_log(stream_id, topic_id, partition_id).await?;
+        }
+        Ok(())
+    }
     pub async fn delete_segments(
         &self,
         session: &Session,
         stream_id: &Identifier,
         topic_id: &Identifier,
-        partition_id: u32,
+        partition_id: usize,
         segments_count: u32,
     ) -> Result<(), IggyError> {
         // Assert authentication.
         self.ensure_authenticated(session)?;
-        todo!();
+        self.ensure_topic_exists(stream_id, topic_id)?;
+        self.delete_segments_base(stream_id, topic_id, partition_id, 
segments_count)
+            .await
     }
 }
diff --git a/core/server/src/shard/system/snapshot/mod.rs 
b/core/server/src/shard/system/snapshot/mod.rs
index 658c8a4b..630dd2be 100644
--- a/core/server/src/shard/system/snapshot/mod.rs
+++ b/core/server/src/shard/system/snapshot/mod.rs
@@ -23,7 +23,7 @@ use crate::shard::IggyShard;
 use crate::streaming::session::Session;
 use async_zip::base::write::ZipFileWriter;
 use async_zip::{Compression, ZipEntryBuilder};
-use compio::fs::{OpenOptions};
+use compio::fs::OpenOptions;
 use compio::io::{AsyncReadAtExt, AsyncWriteAtExt};
 use iggy_common::{IggyDuration, IggyError, Snapshot, SnapshotCompression, 
SystemSnapshotType};
 use std::path::PathBuf;
diff --git a/core/server/src/shard/system/stats.rs 
b/core/server/src/shard/system/stats.rs
index 1cd674b4..1faa0bc1 100644
--- a/core/server/src/shard/system/stats.rs
+++ b/core/server/src/shard/system/stats.rs
@@ -18,6 +18,7 @@
 
 use crate::VERSION;
 use crate::shard::IggyShard;
+use crate::slab::traits_ext::{EntityComponentSystem, IntoComponents};
 use crate::versioning::SemanticVersion;
 use iggy_common::locking::IggyRwLockFn;
 use iggy_common::{IggyDuration, IggyError, Stats};
@@ -90,26 +91,40 @@ impl IggyShard {
 
         drop(sys);
 
-        //TODO:
-        /*
-        for stream in self.streams.borrow().values() {
-            stats.messages_count += stream.get_messages_count();
-            stats.segments_count += stream.get_segments_count();
-            stats.messages_size_bytes += stream.get_size();
-            stats.streams_count += 1;
-            stats.topics_count += stream.topics.len() as u32;
-            stats.partitions_count += stream
-                .topics
-                .values()
-                .map(|t| t.partitions.len() as u32)
-                .sum::<u32>();
-            stats.consumer_groups_count += stream
-                .topics
-                .values()
-                .map(|t| t.consumer_groups.borrow().len() as u32)
-                .sum::<u32>();
-        }
-        */
+        self.streams2.with_components(|stream_components| {
+            let (stream_roots, stream_stats) = 
stream_components.into_components();
+            // Iterate through all streams
+            for (stream_id, stream_root) in stream_roots.iter() {
+                stats.streams_count += 1;
+
+                // Get stream-level stats
+                if let Some(stream_stat) = stream_stats.get(stream_id) {
+                    stats.messages_count += 
stream_stat.messages_count_inconsistent();
+                    stats.segments_count += 
stream_stat.segments_count_inconsistent();
+                    stats.messages_size_bytes += 
stream_stat.size_bytes_inconsistent().into();
+                }
+
+                // Access topics within this stream
+                stream_root.topics().with_components(|topic_components| {
+                    let (topic_roots, ..) = topic_components.into_components();
+                    stats.topics_count += topic_roots.len() as u32;
+
+                    // Iterate through all topics in this stream
+                    for (_, topic_root) in topic_roots.iter() {
+                        // Count partitions in this topic
+                        topic_root
+                            .partitions()
+                            .with_components(|partition_components| {
+                                let (partition_roots, ..) = 
partition_components.into_components();
+                                stats.partitions_count += 
partition_roots.len() as u32;
+                            });
+
+                        // Count consumer groups in this topic
+                        stats.consumer_groups_count += 
topic_root.consumer_groups().len() as u32;
+                    }
+                });
+            }
+        });
 
         Ok(stats)
     }
diff --git a/core/server/src/shard/system/streams.rs 
b/core/server/src/shard/system/streams.rs
index bf0d6024..11e7e00a 100644
--- a/core/server/src/shard/system/streams.rs
+++ b/core/server/src/shard/system/streams.rs
@@ -21,14 +21,11 @@ use crate::shard::IggyShard;
 use crate::slab::traits_ext::{DeleteCell, EntityMarker, InsertCell};
 
 use crate::streaming::session::Session;
-use crate::streaming::stats::stats::StreamStats;
 use crate::streaming::streams::storage2::{create_stream_file_hierarchy, 
delete_stream_from_disk};
 use crate::streaming::streams::{self, stream2};
 use error_set::ErrContext;
 
-use iggy_common::locking::IggyRwLockFn;
 use iggy_common::{Identifier, IggyError, IggyTimestamp};
-use std::sync::Arc;
 
 impl IggyShard {
     pub async fn create_stream2(
@@ -127,12 +124,6 @@ impl IggyShard {
             .decrement_messages(stats.messages_count_inconsistent());
         self.metrics
             .decrement_segments(stats.segments_count_inconsistent());
-
-        /*
-        self.client_manager
-            .borrow_mut()
-            .delete_consumer_groups_for_stream(stream_id as u32);
-        */
         stream
     }
 
@@ -157,36 +148,69 @@ impl IggyShard {
                 )
             })?;
         let mut stream = self.delete_stream2_base(id);
+        // Clean up consumer groups from ClientManager for this stream
+        let stream_id_usize = stream.id();
+        self.client_manager
+            .borrow_mut()
+            .delete_consumer_groups_for_stream(stream_id_usize);
         delete_stream_from_disk(self.id, &mut stream, 
&self.config.system).await?;
         Ok(stream)
     }
 
-    pub async fn purge_stream2(&self, session: &Session, id: &Identifier) -> 
Result<(), IggyError> {
+    pub async fn purge_stream2(
+        &self,
+        session: &Session,
+        stream_id: &Identifier,
+    ) -> Result<(), IggyError> {
         self.ensure_authenticated(session)?;
-        // self.ensure_stream_exists(id)?;
-        let get_stream_id = 
crate::streaming::streams::helpers::get_stream_id();
-        let stream_id = self.streams2.with_stream_by_id(id, get_stream_id);
-        self.permissioner
-            .borrow()
-            .purge_stream(session.get_user_id(), stream_id as u32)
-            .with_error_context(|error| {
+        self.ensure_stream_exists(stream_id)?;
+        {
+            let get_stream_id = 
crate::streaming::streams::helpers::get_stream_id();
+            let stream_id = self.streams2.with_stream_by_id(stream_id, 
get_stream_id);
+            self.permissioner
+                .borrow()
+                .purge_stream(session.get_user_id(), stream_id as u32)
+                .with_error_context(|error| {
                 format!(
                     "{COMPONENT} (error: {error}) - permission denied to purge 
stream for user {}, stream ID: {}",
                     session.get_user_id(),
                     stream_id,
                 )
             })?;
-        self.purge_stream2_base(id)?;
+        }
+
+        //TODO: Tech debt.
+        let topic_ids = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_topic_ids());
+
+        // Purge each topic in the stream using bypass auth
+        for topic_id in topic_ids {
+            let topic_identifier = Identifier::numeric(topic_id as 
u32).unwrap();
+            self.purge_topic2(session, stream_id, &topic_identifier)
+                .await?;
+        }
         Ok(())
     }
 
-    pub fn purge_stream2_bypass_auth(&self, stream_id: &Identifier) -> 
Result<(), IggyError> {
-        self.purge_stream2_base(stream_id)?;
+    pub async fn purge_stream2_bypass_auth(&self, stream_id: &Identifier) -> 
Result<(), IggyError> {
+        self.purge_stream2_base(stream_id).await?;
         Ok(())
     }
 
-    fn purge_stream2_base(&self, _stream_id: &Identifier) -> Result<(), 
IggyError> {
-        // TODO
+    async fn purge_stream2_base(&self, stream_id: &Identifier) -> Result<(), 
IggyError> {
+        // Get all topic IDs in the stream
+        let topic_ids = self
+            .streams2
+            .with_stream_by_id(stream_id, streams::helpers::get_topic_ids());
+
+        // Purge each topic in the stream using bypass auth
+        for topic_id in topic_ids {
+            let topic_identifier = Identifier::numeric(topic_id as 
u32).unwrap();
+            self.purge_topic2_bypass_auth(stream_id, &topic_identifier)
+                .await?;
+        }
+
         Ok(())
     }
 }
diff --git a/core/server/src/shard/system/topics.rs 
b/core/server/src/shard/system/topics.rs
index a9cf7d9f..f2995b30 100644
--- a/core/server/src/shard/system/topics.rs
+++ b/core/server/src/shard/system/topics.rs
@@ -19,7 +19,7 @@
 use super::COMPONENT;
 use crate::shard::IggyShard;
 use crate::shard_info;
-use crate::slab::traits_ext::{EntityMarker, InsertCell};
+use crate::slab::traits_ext::{EntityComponentSystem, EntityMarker, InsertCell, 
IntoComponents};
 use crate::streaming::session::Session;
 use crate::streaming::stats::stats::{StreamStats, TopicStats};
 use crate::streaming::topics::storage2::{create_topic_file_hierarchy, 
delete_topic_from_disk};
@@ -29,8 +29,10 @@ use error_set::ErrContext;
 use iggy_common::{
     CompressionAlgorithm, Identifier, IggyError, IggyExpiry, IggyTimestamp, 
MaxTopicSize,
 };
+use std::any::Any;
 use std::str::FromStr;
 use std::sync::Arc;
+use std::u32;
 
 impl IggyShard {
     pub async fn create_topic2(
@@ -139,7 +141,7 @@ impl IggyShard {
         replication_factor: Option<u8>,
     ) -> Result<(), IggyError> {
         self.ensure_authenticated(session)?;
-        //self.ensure_topic_exists(stream_id, topic_id)?;
+        self.ensure_topic_exists(stream_id, topic_id)?;
         {
             let topic_id_val = self.streams2.with_topic_by_id(
                 stream_id,
@@ -247,6 +249,10 @@ impl IggyShard {
                     )
                 })?;
         let mut topic = self.delete_topic_base2(stream_id, topic_id);
+        // Clean up consumer groups from ClientManager for this topic
+        self.client_manager
+            .borrow_mut()
+            .delete_consumer_groups_for_topic(numeric_stream_id, topic.id());
         let parent = topic.stats().parent().clone();
         // We need to borrow topic as mutable, as we are extracting partitions 
out of it, in order to close them.
         let (messages_count, size_bytes, segments_count) =
@@ -304,34 +310,54 @@ impl IggyShard {
             })?;
         }
 
-        self.streams2.with_partitions_mut(
+        self.streams2.with_partitions(
             stream_id,
             topic_id,
             partitions::helpers::purge_partitions_mem(),
         );
-        self.streams2.with_partitions_mut(
+
+        let (consumer_offset_paths, consumer_group_offset_paths) = 
self.streams2.with_partitions(
             stream_id,
             topic_id,
-            partitions::helpers::purge_segments_mem(),
+            partitions::helpers::purge_consumer_offsets(),
         );
-        self.streams2
-            .with_topic_by_id_async(stream_id, topic_id, 
topics::helpers::purge_topic_disk())
-            .await;
+        for path in consumer_offset_paths {
+            self.delete_consumer_offset_from_disk(&path).await?;
+        }
+        for path in consumer_group_offset_paths {
+            self.delete_consumer_offset_from_disk(&path).await?;
+        }
+
+        self.purge_topic_base2(stream_id, topic_id).await?;
+        Ok(())
+    }
+
+    pub async fn purge_topic2_bypass_auth(
+        &self,
+        stream_id: &Identifier,
+        topic_id: &Identifier,
+    ) -> Result<(), IggyError> {
+        self.purge_topic_base2(stream_id, topic_id).await?;
         Ok(())
     }
 
     async fn purge_topic_base2(
         &self,
-        _stream_id: &Identifier,
-        _topic_id: &Identifier,
+        stream_id: &Identifier,
+        topic_id: &Identifier,
     ) -> Result<(), IggyError> {
-        /*
-        self.streams2
+        let part_ids = self
+            .streams2
             .with_partitions(stream_id, topic_id, |partitions| {
-                //partitions
+                partitions.with_components(|components| {
+                    let (roots, ..) = components.into_components();
+                    roots.iter().map(|(_, root)| root.id()).collect::<Vec<_>>()
+                })
             });
-        */
-
+        for part_id in part_ids {
+            self.delete_segments_bypass_auth(stream_id, topic_id, part_id, 
u32::MAX)
+                .await?;
+        }
         Ok(())
     }
 }
diff --git a/core/server/src/shard/system/users.rs 
b/core/server/src/shard/system/users.rs
index c87c5dbc..a28bfcdb 100644
--- a/core/server/src/shard/system/users.rs
+++ b/core/server/src/shard/system/users.rs
@@ -162,61 +162,60 @@ impl IggyShard {
                 )
             })?;
 
-        let user_id = self.create_user_base(username, password, status, 
permissions)?;
-        self.get_user(&user_id.try_into()?)
+        if self
+            .users
+            .borrow()
+            .iter()
+            .any(|(_, user)| user.username == username)
+        {
+            error!("User: {username} already exists.");
+            return Err(IggyError::UserAlreadyExists);
+        }
+
+        if self.users.borrow().len() >= MAX_USERS {
+            error!("Available users limit reached.");
+            return Err(IggyError::UsersLimitReached);
+        }
+
+        // TODO: Tech debt, replace with Slab.
+        USER_ID.fetch_add(1, Ordering::SeqCst);
+        let current_user_id = USER_ID.load(Ordering::SeqCst);
+        self.create_user_base(current_user_id, username, password, status, 
permissions)?;
+        self.get_user(&current_user_id.try_into()?)
             .with_error_context(|error| {
-                format!("{COMPONENT} (error: {error}) - failed to get user 
with id: {user_id}")
+                format!(
+                    "{COMPONENT} (error: {error}) - failed to get user with 
id: {current_user_id}"
+                )
             })
     }
 
     pub fn create_user_bypass_auth(
         &self,
+        user_id: u32,
         username: &str,
         password: &str,
         status: UserStatus,
         permissions: Option<Permissions>,
-    ) -> Result<u32, IggyError> {
-        let user_id = self.create_user_base(username, password, status, 
permissions)?;
-        Ok(user_id)
+    ) -> Result<(), IggyError> {
+        self.create_user_base(user_id, username, password, status, 
permissions)?;
+        Ok(())
     }
 
     fn create_user_base(
         &self,
+        user_id: u32,
         username: &str,
         password: &str,
         status: UserStatus,
         permissions: Option<Permissions>,
-    ) -> Result<u32, IggyError> {
-        if self
-            .users
-            .borrow()
-            .iter()
-            .any(|(_, user)| user.username == username)
-        {
-            error!("User: {username} already exists.");
-            return Err(IggyError::UserAlreadyExists);
-        }
-
-        if self.users.borrow().len() >= MAX_USERS {
-            error!("Available users limit reached.");
-            return Err(IggyError::UsersLimitReached);
-        }
-
-        let user_id = USER_ID.fetch_add(1, Ordering::SeqCst);
-        let current_user_id = USER_ID.load(Ordering::SeqCst);
-        let user = User::new(
-            current_user_id,
-            username,
-            password,
-            status,
-            permissions.clone(),
-        );
+    ) -> Result<(), IggyError> {
+        let user = User::new(user_id, username, password, status, 
permissions.clone());
         self.permissioner
             .borrow_mut()
             .init_permissions_for_user(user_id, permissions);
         self.users.borrow_mut().insert(user.id, user);
         self.metrics.increment_users(1);
-        Ok(user_id)
+        Ok(())
     }
 
     pub fn delete_user(&self, session: &Session, user_id: &Identifier) -> 
Result<User, IggyError> {
@@ -319,7 +318,7 @@ impl IggyShard {
         }
 
         let mut user = self.get_user_mut(user_id).with_error_context(|error| {
-            format!("{COMPONENT} (error: {error}) - failed to get mutable 
reference to the user with id: {user_id}")
+            format!("{COMPONENT} update user (error: {error}) - failed to get 
mutable reference to the user with id: {user_id}")
         })?;
         if let Some(username) = username {
             user.username = username;
@@ -389,7 +388,7 @@ impl IggyShard {
         {
             let mut user = 
self.get_user_mut(user_id).with_error_context(|error| {
                 format!(
-                    "{COMPONENT} (error: {error}) - failed to get mutable 
reference to the user with id: {user_id}"
+                    "{COMPONENT} update user permissions (error: {error}) - 
failed to get mutable reference to the user with id: {user_id}"
                 )
             })?;
             user.permissions = permissions;
@@ -438,7 +437,7 @@ impl IggyShard {
         new_password: &str,
     ) -> Result<(), IggyError> {
         let mut user = self.get_user_mut(user_id).with_error_context(|error| {
-            format!("{COMPONENT} (error: {error}) - failed to get mutable 
reference to the user with id: {user_id}")
+            format!("{COMPONENT} change password (error: {error}) - failed to 
get mutable reference to the user with id: {user_id}")
         })?;
         if !crypto::verify_password(current_password, &user.password) {
             error!(
diff --git a/core/server/src/shard/transmission/event.rs 
b/core/server/src/shard/transmission/event.rs
index d7e725b1..afaa6da4 100644
--- a/core/server/src/shard/transmission/event.rs
+++ b/core/server/src/shard/transmission/event.rs
@@ -89,6 +89,7 @@ pub enum ShardEvent {
         polling_consumer: PollingConsumer,
     },
     CreatedUser {
+        user_id: u32,
         username: String,
         password: String,
         status: UserStatus,
@@ -127,12 +128,31 @@ pub enum ShardEvent {
         name: String,
     },
     LoginWithPersonalAccessToken {
+        client_id: u32,
         token: String,
     },
+    DeletedSegments {
+        stream_id: Identifier,
+        topic_id: Identifier,
+        partition_id: usize,
+        segments_count: u32,
+    },
     NewSession {
         address: SocketAddr,
         transport: TransportProtocol,
     },
+    JoinedConsumerGroup {
+        client_id: u32,
+        stream_id: Identifier,
+        topic_id: Identifier,
+        group_id: Identifier,
+    },
+    LeftConsumerGroup {
+        client_id: u32,
+        stream_id: Identifier,
+        topic_id: Identifier,
+        group_id: Identifier,
+    },
     TcpBound {
         address: SocketAddr,
     },
diff --git a/core/server/src/slab/consumer_groups.rs 
b/core/server/src/slab/consumer_groups.rs
index 21e60d36..683c3a0e 100644
--- a/core/server/src/slab/consumer_groups.rs
+++ b/core/server/src/slab/consumer_groups.rs
@@ -3,7 +3,7 @@ use crate::{
         Keyed, consumer_groups,
         traits_ext::{
             Borrow, ComponentsById, Delete, EntityComponentSystem, 
EntityComponentSystemMut,
-            Insert, IntoComponents, IntoComponentsById,
+            EntityMarker, Insert, IntoComponents, IntoComponentsById,
         },
     },
     streaming::topics::consumer_group2::{self, ConsumerGroupRef, 
ConsumerGroupRefMut},
@@ -37,6 +37,8 @@ impl Insert for ConsumerGroups {
             "consumer_group: id mismatch when inserting members"
         );
         self.index.insert(key, entity_id);
+        let root = self.root.get_mut(entity_id).unwrap();
+        root.update_id(entity_id);
         entity_id
     }
 }
@@ -46,12 +48,12 @@ impl Delete for ConsumerGroups {
     type Item = consumer_group2::ConsumerGroup;
 
     fn delete(&mut self, id: Self::Idx) -> Self::Item {
-        let (name, partitions) = self.root.remove(id).disarray();
-        let members = self.members.remove(id).into_inner();
+        let root = self.root.remove(id);
+        let members = self.members.remove(id);
         self.index
-            .remove(&name)
+            .remove(root.key())
             .expect("consumer_group_delete: key not found");
-        consumer_group2::ConsumerGroup::new(name, members, partitions)
+        consumer_group2::ConsumerGroup::new_with_components(root, members)
     }
 }
 
@@ -113,6 +115,10 @@ impl ConsumerGroups {
         }
     }
 
+    pub fn len(&self) -> usize {
+        self.root.len()
+    }
+
     pub fn get_index(&self, id: &Identifier) -> usize {
         match id.kind {
             iggy_common::IdKind::Numeric => id.get_u32_value().unwrap() as 
usize,
diff --git a/core/server/src/slab/partitions.rs 
b/core/server/src/slab/partitions.rs
index 34ca117d..678846c3 100644
--- a/core/server/src/slab/partitions.rs
+++ b/core/server/src/slab/partitions.rs
@@ -96,6 +96,8 @@ impl Insert for Partitions {
             entity_id, id,
             "partition_insert: id mismatch when creating consumer_group_offset"
         );
+        let root = self.root.get_mut(entity_id).unwrap();
+        root.update_id(entity_id);
         entity_id
     }
 }
@@ -105,7 +107,23 @@ impl Delete for Partitions {
     type Item = Partition;
 
     fn delete(&mut self, id: Self::Idx) -> Self::Item {
-        todo!()
+        let root = self.root.remove(id);
+        let stats = self.stats.remove(id);
+        let message_deduplicator = self.message_deduplicator.remove(id);
+        let offset = self.offset.remove(id);
+        let consumer_offset = self.consumer_offset.remove(id);
+        let consumer_group_offset = self.consumer_group_offset.remove(id);
+        let log = self.log.remove(id);
+
+        Partition::new_with_components(
+            root,
+            stats,
+            message_deduplicator,
+            offset,
+            consumer_offset,
+            consumer_group_offset,
+            log,
+        )
     }
 }
 
diff --git a/core/server/src/slab/streams.rs b/core/server/src/slab/streams.rs
index 02ab2850..d733e04e 100644
--- a/core/server/src/slab/streams.rs
+++ b/core/server/src/slab/streams.rs
@@ -112,8 +112,21 @@ impl DeleteCell for Streams {
     type Idx = ContainerId;
     type Item = stream2::Stream;
 
-    fn delete(&self, _id: Self::Idx) -> Self::Item {
-        todo!()
+    fn delete(&self, id: Self::Idx) -> Self::Item {
+        let mut root_container = self.root.borrow_mut();
+        let mut indexes = self.index.borrow_mut();
+        let mut stats_container = self.stats.borrow_mut();
+
+        let root = root_container.remove(id);
+        let stats = stats_container.remove(id);
+
+        // Remove from index
+        let key = root.key();
+        indexes
+            .remove(key)
+            .expect("stream_delete: key not found in index");
+
+        stream2::Stream::new_with_components(root, stats)
     }
 }
 
@@ -718,7 +731,8 @@ impl Streams {
         });
         let (log_writer, index_writer) =
             self.with_partition_by_id_mut(stream_id, topic_id, partition_id, 
|(.., log)| {
-                log.active_storage_mut().shutdown()
+                let (msg, index) = log.active_storage_mut().shutdown();
+                (msg.unwrap(), index.unwrap())
             });
 
         compio::runtime::spawn(async move {
diff --git a/core/server/src/slab/topics.rs b/core/server/src/slab/topics.rs
index 549a2704..7508d675 100644
--- a/core/server/src/slab/topics.rs
+++ b/core/server/src/slab/topics.rs
@@ -73,8 +73,22 @@ impl DeleteCell for Topics {
     type Item = topic2::Topic;
 
     fn delete(&self, id: Self::Idx) -> Self::Item {
-        // TODO: don't forget to remoev from the index
-        todo!()
+        let mut root_container = self.root.borrow_mut();
+        let mut auxilaries = self.auxilaries.borrow_mut();
+        let mut indexes = self.index.borrow_mut();
+        let mut stats_container = self.stats.borrow_mut();
+
+        let root = root_container.remove(id);
+        let auxilary = auxilaries.remove(id);
+        let stats = stats_container.remove(id);
+
+        // Remove from index
+        let key = root.key();
+        indexes
+            .remove(key)
+            .expect("topic_delete: key not found in index");
+
+        topic2::Topic::new_with_components(root, auxilary, stats)
     }
 }
 
diff --git a/core/server/src/slab/traits_ext.rs 
b/core/server/src/slab/traits_ext.rs
index 0db207cf..949971fa 100644
--- a/core/server/src/slab/traits_ext.rs
+++ b/core/server/src/slab/traits_ext.rs
@@ -158,7 +158,7 @@ type MappingByIdMut<'a, E, T> =
 pub type Components<T> = <T as IntoComponents>::Components;
 pub type ComponentsById<'a, T> = <T as IntoComponentsById>::Output;
 
-// TODO: 
+// TODO:
 // I've figured there is actually and ergonomic improvement that can be made 
here.
 // Observe that the chain of constraints put on the `EntityRef` type is 
actually wrong.
 // We constraint the `EntityRef` to be IntoComponents + IntoComponentsById,
@@ -173,7 +173,7 @@ pub type ComponentsById<'a, T> = <T as 
IntoComponentsById>::Output;
 
 // Maybe lets not go this way with the tuple mapping madness, it already is 
pretty difficult to distinguish between all of the different components,
 // and everytime we add a new component to an entity, we need to update the 
tuple type everywhere.
-// Better idea would be to use the `EntityRef` type directly inside of the 
`with_components_by_id` closure 
+// Better idea would be to use the `EntityRef` type directly inside of the 
`with_components_by_id` closure
 // -- f(components.into_components_by_id(id)) -> 
components.into_components_by_id(id) would return `EntityRef`, rather than the 
tuple.
 pub trait EntityComponentSystem<T>
 where
diff --git a/core/server/src/streaming/clients/client_manager.rs 
b/core/server/src/streaming/clients/client_manager.rs
index 8e41b69c..9fad13c5 100644
--- a/core/server/src/streaming/clients/client_manager.rs
+++ b/core/server/src/streaming/clients/client_manager.rs
@@ -23,7 +23,6 @@ use iggy_common::IggyError;
 use iggy_common::IggyTimestamp;
 use iggy_common::TransportProtocol;
 use iggy_common::UserId;
-use std::fmt::{Display, Formatter};
 use std::net::SocketAddr;
 use std::rc::Rc;
 
@@ -119,7 +118,7 @@ impl ClientManager {
     }
 
     pub fn delete_client(&mut self, client_id: u32) -> Option<Client> {
-        if let Some(mut client) = self.clients.remove(&client_id) {
+        if let Some(client) = self.clients.remove(&client_id) {
             client.session.clear_user_id();
             Some(client)
         } else {
@@ -130,10 +129,13 @@ impl ClientManager {
     pub fn join_consumer_group(
         &mut self,
         client_id: u32,
-        stream_id: u32,
-        topic_id: u32,
-        group_id: u32,
+        stream_id: usize,
+        topic_id: usize,
+        group_id: usize,
     ) -> Result<(), IggyError> {
+        let stream_id = stream_id as u32;
+        let topic_id = topic_id as u32;
+        let group_id = group_id as u32;
         let client = self.clients.get_mut(&client_id);
         if client.is_none() {
             return Err(IggyError::ClientNotFound(client_id));
@@ -159,15 +161,18 @@ impl ClientManager {
     pub fn leave_consumer_group(
         &mut self,
         client_id: u32,
-        stream_id: u32,
-        topic_id: u32,
-        consumer_group_id: u32,
+        stream_id: usize,
+        topic_id: usize,
+        consumer_group_id: usize,
     ) -> Result<(), IggyError> {
+        let stream_id = stream_id as u32;
+        let topic_id = topic_id as u32;
+        let consumer_group_id = consumer_group_id as u32;
         let client = self.clients.get_mut(&client_id);
         if client.is_none() {
             return Err(IggyError::ClientNotFound(client_id));
         }
-        let mut client = client.unwrap();
+        let client = client.unwrap();
         for (index, consumer_group) in 
client.consumer_groups.iter().enumerate() {
             if consumer_group.stream_id == stream_id
                 && consumer_group.topic_id == topic_id
@@ -180,7 +185,21 @@ impl ClientManager {
         Ok(())
     }
 
-    pub fn delete_consumer_groups_for_stream(&mut self, stream_id: u32) {
+    pub fn delete_consumer_group(&mut self, stream_id: usize, topic_id: usize, 
group_id: usize) {
+        let stream_id = stream_id as u32;
+        let topic_id = topic_id as u32;
+        let group_id = group_id as u32;
+        for client in self.clients.values_mut() {
+            client.consumer_groups.retain(|consumer_group| {
+                !(consumer_group.stream_id == stream_id
+                    && consumer_group.topic_id == topic_id
+                    && consumer_group.group_id == group_id)
+            });
+        }
+    }
+
+    pub fn delete_consumer_groups_for_stream(&mut self, stream_id: usize) {
+        let stream_id = stream_id as u32;
         for client in self.clients.values_mut() {
             let indexes_to_remove = client
                 .consumer_groups
@@ -200,7 +219,9 @@ impl ClientManager {
         }
     }
 
-    pub fn delete_consumer_groups_for_topic(&mut self, stream_id: u32, 
topic_id: u32) {
+    pub fn delete_consumer_groups_for_topic(&mut self, stream_id: usize, 
topic_id: usize) {
+        let stream_id = stream_id as u32;
+        let topic_id = topic_id as u32;
         for client in self.clients.values_mut() {
             let indexes_to_remove = client
                 .consumer_groups
diff --git a/core/server/src/streaming/partitions/helpers.rs 
b/core/server/src/streaming/partitions/helpers.rs
index f9baf62e..1062a6dc 100644
--- a/core/server/src/streaming/partitions/helpers.rs
+++ b/core/server/src/streaming/partitions/helpers.rs
@@ -62,12 +62,49 @@ pub fn insert_partition(
     move |partitions| partitions.insert(partition)
 }
 
-pub fn purge_partitions_mem() -> impl FnOnce(&mut Partitions) {
+pub fn purge_partitions_mem() -> impl FnOnce(&Partitions) {
     |partitions| {
         partitions.with_components(|components| {
-            let (_root, _stats, _deduplicator, _offset, _consumer_offset, 
_cg_offset, _log) =
-                components.into_components();
-            // TODO: Implement purge logic
+            let (.., stats, _, offsets, _, _, _) = 
components.into_components();
+            for (offset, stat) in offsets
+                .iter()
+                .map(|(_, o)| o)
+                .zip(stats.iter().map(|(_, s)| s))
+            {
+                offset.store(0, Ordering::Relaxed);
+                stat.zero_out_all();
+            }
+        })
+    }
+}
+
+pub fn purge_consumer_offsets() -> impl FnOnce(&Partitions) -> (Vec<String>, 
Vec<String>) {
+    |partitions| {
+        partitions.with_components(|components| {
+            let (.., consumer_offsets, cg_offsets, _) = 
components.into_components();
+
+            let mut consumer_offset_paths = Vec::new();
+            let mut consumer_group_offset_paths = Vec::new();
+
+            // Collect paths and clear consumer offsets
+            for (_, consumer_offset) in consumer_offsets {
+                let hdl = consumer_offset.pin();
+                for item in hdl.values() {
+                    consumer_offset_paths.push(item.path.clone());
+                }
+                hdl.clear(); // Clear the hashmap
+            }
+
+            // Collect paths and clear consumer group offsets
+            for (_, cg_offset) in cg_offsets {
+                let hdl = cg_offset.pin();
+                for item in hdl.values() {
+                    consumer_group_offset_paths.push(item.path.clone());
+                }
+                hdl.clear(); // Clear the hashmap
+            }
+
+            (consumer_offset_paths, consumer_group_offset_paths)
         })
     }
 }
@@ -119,13 +156,13 @@ pub fn store_consumer_offset(
 
 pub fn delete_consumer_offset(
     id: usize,
-) -> impl FnOnce(ComponentsById<PartitionRef>) -> Result<(), IggyError> {
+) -> impl FnOnce(ComponentsById<PartitionRef>) -> Result<String, IggyError> {
     move |(.., offsets, _, _)| {
-        offsets
-            .pin()
+        let hdl = offsets.pin();
+        let offset = hdl
             .remove(&id)
-            .map(|_| ())
-            .ok_or_else(|| IggyError::ConsumerOffsetNotFound(id))
+            .ok_or_else(|| IggyError::ConsumerOffsetNotFound(id))?;
+        Ok(offset.path.clone())
     }
 }
 
@@ -180,13 +217,13 @@ pub fn store_consumer_group_member_offset(
 
 pub fn delete_consumer_group_member_offset(
     id: usize,
-) -> impl FnOnce(ComponentsById<PartitionRef>) -> Result<(), IggyError> {
+) -> impl FnOnce(ComponentsById<PartitionRef>) -> Result<String, IggyError> {
     move |(.., offsets, _)| {
-        offsets
-            .pin()
+        let hdl = offsets.pin();
+        let offset = hdl
             .remove(&id)
-            .map(|_| ())
-            .ok_or_else(|| IggyError::ConsumerOffsetNotFound(id))
+            .ok_or_else(|| IggyError::ConsumerOffsetNotFound(id))?;
+        Ok(offset.path.clone())
     }
 }
 
@@ -218,13 +255,6 @@ pub fn delete_consumer_group_member_offset_from_disk(
     }
 }
 
-pub fn purge_segments_mem() -> impl FnOnce(&mut Partitions) {
-    |_partitions| {
-        // TODO:
-        //partitions.segments_mut()
-    }
-}
-
 pub fn create_message_deduplicator(config: &SystemConfig) -> 
Option<MessageDeduplicator> {
     if !config.message_deduplication.enabled {
         return None;
@@ -668,14 +698,14 @@ pub fn append_to_journal(
         let batch_messages_size = batch.size();
         let batch_messages_count = batch.count();
 
+        stats.increment_size_bytes(batch_messages_size as u64);
+        stats.increment_messages_count(batch_messages_count as u64);
+
         segment.end_timestamp = batch.last_timestamp().unwrap();
         segment.end_offset = batch.last_offset().unwrap();
 
         let (journal_messages_count, journal_size) = 
log.journal_mut().append(shard_id, batch)?;
 
-        stats.increment_messages_count(batch_messages_count as u64);
-        stats.increment_size_bytes(batch_messages_size as u64);
-
         let last_offset = if batch_messages_count == 0 {
             current_offset
         } else {
@@ -802,14 +832,12 @@ pub fn update_index_and_increment_stats(
     batch_count: u32,
     config: &SystemConfig,
 ) -> impl FnOnce(ComponentsById<PartitionRefMut>) {
-    move |(_, stats, .., log)| {
+    move |(.., log)| {
         let segment = log.active_segment_mut();
         segment.size += saved.as_bytes_u32();
         log.active_indexes_mut().unwrap().mark_saved();
         if config.segment.cache_indexes == CacheIndexesConfig::None {
             log.active_indexes_mut().unwrap().clear();
         }
-        stats.increment_size_bytes(saved.as_bytes_u64());
-        stats.increment_messages_count(batch_count as u64);
     }
 }
diff --git a/core/server/src/streaming/partitions/log.rs 
b/core/server/src/streaming/partitions/log.rs
index ebee527e..3ff049e9 100644
--- a/core/server/src/streaming/partitions/log.rs
+++ b/core/server/src/streaming/partitions/log.rs
@@ -56,6 +56,14 @@ where
         &self.segments
     }
 
+    pub fn segments_mut(&mut self) -> &mut Vec<Segment2> {
+        &mut self.segments
+    }
+
+    pub fn storages_mut(&mut self) -> &mut Vec<Storage> {
+        &mut self.storage
+    }
+
     pub fn storages(&self) -> &Vec<Storage> {
         &self.storage
     }
@@ -88,6 +96,10 @@ where
         &self.indexes
     }
 
+    pub fn indexes_mut(&mut self) -> &mut Vec<Option<IggyIndexesMut>> {
+        &mut self.indexes
+    }
+
     pub fn active_indexes(&self) -> Option<&IggyIndexesMut> {
         self.indexes
             .last()
diff --git a/core/server/src/streaming/partitions/partition2.rs 
b/core/server/src/streaming/partitions/partition2.rs
index 92d8f738..6c85dfb0 100644
--- a/core/server/src/streaming/partitions/partition2.rs
+++ b/core/server/src/streaming/partitions/partition2.rs
@@ -117,6 +117,26 @@ impl Partition {
         }
     }
 
+    pub fn new_with_components(
+        root: PartitionRoot,
+        stats: Arc<PartitionStats>,
+        message_deduplicator: Option<MessageDeduplicator>,
+        offset: Arc<AtomicU64>,
+        consumer_offset: Arc<ConsumerOffsets>,
+        consumer_group_offset: Arc<ConsumerGroupOffsets>,
+        log: SegmentedLog<MemoryMessageJournal>,
+    ) -> Self {
+        Self {
+            root,
+            stats,
+            message_deduplicator,
+            offset,
+            consumer_offset,
+            consumer_group_offset,
+            log,
+        }
+    }
+
     pub fn stats(&self) -> &PartitionStats {
         &self.stats
     }
diff --git a/core/server/src/streaming/segments/messages/messages_writer.rs 
b/core/server/src/streaming/segments/messages/messages_writer.rs
index becc7aea..da1b5adc 100644
--- a/core/server/src/streaming/segments/messages/messages_writer.rs
+++ b/core/server/src/streaming/segments/messages/messages_writer.rs
@@ -131,6 +131,10 @@ impl MessagesWriter {
         Ok(IggyByteSize::from(messages_size as u64))
     }
 
+    pub fn path(&self) -> String {
+        self.file_path.clone()
+    }
+
     pub async fn fsync(&self) -> Result<(), IggyError> {
         self.file
             .sync_all()
diff --git a/core/server/src/streaming/segments/storage.rs 
b/core/server/src/streaming/segments/storage.rs
index 249b67eb..84fcd783 100644
--- a/core/server/src/streaming/segments/storage.rs
+++ b/core/server/src/streaming/segments/storage.rs
@@ -1,10 +1,8 @@
 use iggy_common::IggyError;
 use std::rc::Rc;
 use std::sync::atomic::AtomicU64;
-use tracing::warn;
 
 use crate::configs::system::SystemConfig;
-use crate::shard_warn;
 use crate::streaming::segments::{
     indexes::{IndexReader, IndexWriter},
     messages::{MessagesReader, MessagesWriter},
@@ -51,9 +49,9 @@ impl Storage {
         })
     }
 
-    pub fn shutdown(&mut self) -> (MessagesWriter, IndexWriter) {
-        let messages_writer = self.messages_writer.take().unwrap();
-        let index_writer = self.index_writer.take().unwrap();
+    pub fn shutdown(&mut self) -> (Option<MessagesWriter>, 
Option<IndexWriter>) {
+        let messages_writer = self.messages_writer.take();
+        let index_writer = self.index_writer.take();
         (messages_writer, index_writer)
     }
 }
diff --git a/core/server/src/streaming/stats/stats.rs 
b/core/server/src/streaming/stats/stats.rs
index 20933c42..67c464f3 100644
--- a/core/server/src/streaming/stats/stats.rs
+++ b/core/server/src/streaming/stats/stats.rs
@@ -50,6 +50,24 @@ impl StreamStats {
     pub fn segments_count_inconsistent(&self) -> u32 {
         self.segments_count.load(Ordering::Relaxed)
     }
+
+    pub fn zero_out_size_bytes(&self) {
+        self.size_bytes.store(0, Ordering::Relaxed);
+    }
+
+    pub fn zero_out_messages_count(&self) {
+        self.messages_count.store(0, Ordering::Relaxed);
+    }
+
+    pub fn zero_out_segments_count(&self) {
+        self.segments_count.store(0, Ordering::Relaxed);
+    }
+
+    pub fn zero_out_all(&self) {
+        self.zero_out_size_bytes();
+        self.zero_out_messages_count();
+        self.zero_out_segments_count();
+    }
 }
 
 #[derive(Default, Debug)]
@@ -143,6 +161,43 @@ impl TopicStats {
     pub fn segments_count_inconsistent(&self) -> u32 {
         self.segments_count.load(Ordering::Relaxed)
     }
+
+    pub fn zero_out_parent_size_bytes(&self) {
+        self.parent.zero_out_size_bytes();
+    }
+
+    pub fn zero_out_parent_messages_count(&self) {
+        self.parent.zero_out_messages_count();
+    }
+
+    pub fn zero_out_parent_segments_count(&self) {
+        self.parent.zero_out_segments_count();
+    }
+
+    pub fn zero_out_parent_all(&self) {
+        self.parent.zero_out_all();
+    }
+
+    pub fn zero_out_size_bytes(&self) {
+        self.size_bytes.store(0, Ordering::Relaxed);
+        self.zero_out_parent_size_bytes();
+    }
+
+    pub fn zero_out_messages_count(&self) {
+        self.messages_count.store(0, Ordering::Relaxed);
+        self.zero_out_parent_messages_count();
+    }
+
+    pub fn zero_out_segments_count(&self) {
+        self.segments_count.store(0, Ordering::Relaxed);
+        self.zero_out_parent_segments_count();
+    }
+
+    pub fn zero_out_all(&self) {
+        self.zero_out_size_bytes();
+        self.zero_out_messages_count();
+        self.zero_out_segments_count();
+    }
 }
 
 #[derive(Default, Debug)]
@@ -236,4 +291,41 @@ impl PartitionStats {
     pub fn segments_count_inconsistent(&self) -> u32 {
         self.segments_count.load(Ordering::Relaxed)
     }
+
+    pub fn zero_out_parent_size_bytes(&self) {
+        self.parent.zero_out_size_bytes();
+    }
+
+    pub fn zero_out_parent_messages_count(&self) {
+        self.parent.zero_out_messages_count();
+    }
+
+    pub fn zero_out_parent_segments_count(&self) {
+        self.parent.zero_out_segments_count();
+    }
+
+    pub fn zero_out_parent_all(&self) {
+        self.parent.zero_out_all();
+    }
+
+    pub fn zero_out_size_bytes(&self) {
+        self.size_bytes.store(0, Ordering::Relaxed);
+        self.zero_out_parent_size_bytes();
+    }
+
+    pub fn zero_out_messages_count(&self) {
+        self.messages_count.store(0, Ordering::Relaxed);
+        self.zero_out_parent_messages_count();
+    }
+
+    pub fn zero_out_segments_count(&self) {
+        self.segments_count.store(0, Ordering::Relaxed);
+        self.zero_out_parent_segments_count();
+    }
+
+    pub fn zero_out_all(&self) {
+        self.zero_out_size_bytes();
+        self.zero_out_messages_count();
+        self.zero_out_segments_count();
+    }
 }
diff --git a/core/server/src/streaming/streams/helpers.rs 
b/core/server/src/streaming/streams/helpers.rs
index f71027e6..73afc612 100644
--- a/core/server/src/streaming/streams/helpers.rs
+++ b/core/server/src/streaming/streams/helpers.rs
@@ -2,7 +2,7 @@ use crate::{
     configs::system::SystemConfig,
     slab::{
         streams,
-        traits_ext::{ComponentsById, EntityComponentSystem},
+        traits_ext::{ComponentsById, EntityComponentSystem, IntoComponents},
     },
     streaming::{
         partitions,
@@ -25,6 +25,18 @@ pub fn update_stream_name(name: String) -> impl 
FnOnce(ComponentsById<StreamRefM
     }
 }
 
+pub fn get_topic_ids() -> impl FnOnce(ComponentsById<StreamRef>) -> Vec<usize> 
{
+    |(root, _)| {
+        root.topics().with_components(|components| {
+            let (topic_roots, ..) = components.into_components();
+            topic_roots
+                .iter()
+                .map(|(_, topic)| topic.id())
+                .collect::<Vec<_>>()
+        })
+    }
+}
+
 pub fn store_consumer_offset(
     consumer_id: usize,
     topic_id: &Identifier,
diff --git a/core/server/src/streaming/streams/stream2.rs 
b/core/server/src/streaming/streams/stream2.rs
index 098ed8fc..d637e29d 100644
--- a/core/server/src/streaming/streams/stream2.rs
+++ b/core/server/src/streaming/streams/stream2.rs
@@ -110,6 +110,10 @@ impl Stream {
         Self { root, stats }
     }
 
+    pub fn new_with_components(root: StreamRoot, stats: Arc<StreamStats>) -> 
Self {
+        Self { root, stats }
+    }
+
     pub fn stats(&self) -> &Arc<StreamStats> {
         &self.stats
     }
diff --git a/core/server/src/streaming/topics/consumer_group2.rs 
b/core/server/src/streaming/topics/consumer_group2.rs
index ef690087..0236d3da 100644
--- a/core/server/src/streaming/topics/consumer_group2.rs
+++ b/core/server/src/streaming/topics/consumer_group2.rs
@@ -53,6 +53,10 @@ impl ConsumerGroupRoot {
         &self.partitions
     }
 
+    pub fn update_id(&mut self, id: usize) {
+        self.id = id;
+    }
+
     pub fn assign_partitions(&mut self, partitions: Vec<usize>) {
         self.partitions = partitions;
     }
@@ -171,6 +175,14 @@ impl ConsumerGroup {
         let members = ConsumerGroupMembers { inner: members };
         Self { root, members }
     }
+
+    pub fn new_with_components(root: ConsumerGroupRoot, members: 
ConsumerGroupMembers) -> Self {
+        Self { root, members }
+    }
+
+    pub fn members(&self) -> &ConsumerGroupMembers {
+        &self.members
+    }
 }
 
 #[derive(Debug)]
diff --git a/core/server/src/streaming/topics/helpers.rs 
b/core/server/src/streaming/topics/helpers.rs
index 57122b31..222aa20b 100644
--- a/core/server/src/streaming/topics/helpers.rs
+++ b/core/server/src/streaming/topics/helpers.rs
@@ -66,10 +66,6 @@ pub fn delete_topic(topic_id: &Identifier) -> impl 
FnOnce(&Topics) -> Topic {
     }
 }
 
-pub fn purge_topic_disk() -> impl AsyncFnOnce(ComponentsById<TopicRef>) {
-    async |(root, ..)| {}
-}
-
 pub fn exists(identifier: &Identifier) -> impl FnOnce(&Topics) -> bool {
     |topics| topics.exists(identifier)
 }
@@ -238,6 +234,10 @@ fn assign_partitions_to_members(
         .iter_mut()
         .for_each(|(_, member)| member.partitions.clear());
     let count = members.len();
+    if count == 0 {
+        return;
+    }
+
     for (idx, partition) in partitions.iter().enumerate() {
         let position = idx % count;
         let member = &mut members[position];
@@ -251,6 +251,7 @@ fn assign_partitions_to_members(
         );
     }
 }
+
 fn mimic_members(members: &Slab<Member>) -> Slab<Member> {
     let mut container = Slab::with_capacity(members.len());
     for (_, member) in members {
diff --git a/core/server/src/streaming/topics/topic2.rs 
b/core/server/src/streaming/topics/topic2.rs
index e2ae830c..64d4fc69 100644
--- a/core/server/src/streaming/topics/topic2.rs
+++ b/core/server/src/streaming/topics/topic2.rs
@@ -89,6 +89,17 @@ impl Topic {
             stats,
         }
     }
+    pub fn new_with_components(
+        root: TopicRoot,
+        auxilary: TopicAuxilary,
+        stats: Arc<TopicStats>,
+    ) -> Self {
+        Self {
+            root,
+            auxilary,
+            stats,
+        }
+    }
 
     pub fn root(&self) -> &TopicRoot {
         &self.root

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