diff --git a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbenum.dart b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbenum.dart
index b2c9812de0..a40dafffca 100644
--- a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbenum.dart
+++ b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbenum.dart
@@ -12,10 +12,12 @@ import 'package:protobuf/protobuf.dart' as $pb;
 class WsDataType extends $pb.ProtobufEnum {
   static const WsDataType Acked = WsDataType._(0, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'Acked');
   static const WsDataType Rev = WsDataType._(1, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'Rev');
+  static const WsDataType Conflict = WsDataType._(2, const $core.bool.fromEnvironment('protobuf.omit_enum_names') ? '' : 'Conflict');
 
   static const $core.List<WsDataType> values = <WsDataType> [
     Acked,
     Rev,
+    Conflict,
   ];
 
   static final $core.Map<$core.int, WsDataType> _byValue = $pb.ProtobufEnum.initByValue(values);
diff --git a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbjson.dart b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbjson.dart
index 41a08e287a..047cc5f579 100644
--- a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbjson.dart
+++ b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-document/ws.pbjson.dart
@@ -14,11 +14,12 @@ const WsDataType$json = const {
   '2': const [
     const {'1': 'Acked', '2': 0},
     const {'1': 'Rev', '2': 1},
+    const {'1': 'Conflict', '2': 2},
   ],
 };
 
 /// Descriptor for `WsDataType`. Decode as a `google.protobuf.EnumDescriptorProto`.
-final $typed_data.Uint8List wsDataTypeDescriptor = $convert.base64Decode('CgpXc0RhdGFUeXBlEgkKBUFja2VkEAASBwoDUmV2EAE=');
+final $typed_data.Uint8List wsDataTypeDescriptor = $convert.base64Decode('CgpXc0RhdGFUeXBlEgkKBUFja2VkEAASBwoDUmV2EAESDAoIQ29uZmxpY3QQAg==');
 @$core.Deprecated('Use wsDocumentDataDescriptor instead')
 const WsDocumentData$json = const {
   '1': 'WsDocumentData',
diff --git a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pb.dart b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pb.dart
index 23c5cb8fc4..6ca0ce8790 100644
--- a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pb.dart
+++ b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pb.dart
@@ -319,64 +319,3 @@ class UpdateViewParams extends $pb.GeneratedMessage {
   void clearIsTrash() => clearField(5);
 }
 
-class DocDeltaRequest extends $pb.GeneratedMessage {
-  static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'DocDeltaRequest', createEmptyInstance: create)
-    ..aOS(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'viewId')
-    ..a<$core.List<$core.int>>(2, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'data', $pb.PbFieldType.OY)
-    ..hasRequiredFields = false
-  ;
-
-  DocDeltaRequest._() : super();
-  factory DocDeltaRequest({
-    $core.String? viewId,
-    $core.List<$core.int>? data,
-  }) {
-    final _result = create();
-    if (viewId != null) {
-      _result.viewId = viewId;
-    }
-    if (data != null) {
-      _result.data = data;
-    }
-    return _result;
-  }
-  factory DocDeltaRequest.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
-  factory DocDeltaRequest.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
-  @$core.Deprecated(
-  'Using this can add significant overhead to your binary. '
-  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
-  'Will be removed in next major version')
-  DocDeltaRequest clone() => DocDeltaRequest()..mergeFromMessage(this);
-  @$core.Deprecated(
-  'Using this can add significant overhead to your binary. '
-  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
-  'Will be removed in next major version')
-  DocDeltaRequest copyWith(void Function(DocDeltaRequest) updates) => super.copyWith((message) => updates(message as DocDeltaRequest)) as DocDeltaRequest; // ignore: deprecated_member_use
-  $pb.BuilderInfo get info_ => _i;
-  @$core.pragma('dart2js:noInline')
-  static DocDeltaRequest create() => DocDeltaRequest._();
-  DocDeltaRequest createEmptyInstance() => create();
-  static $pb.PbList<DocDeltaRequest> createRepeated() => $pb.PbList<DocDeltaRequest>();
-  @$core.pragma('dart2js:noInline')
-  static DocDeltaRequest getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<DocDeltaRequest>(create);
-  static DocDeltaRequest? _defaultInstance;
-
-  @$pb.TagNumber(1)
-  $core.String get viewId => $_getSZ(0);
-  @$pb.TagNumber(1)
-  set viewId($core.String v) { $_setString(0, v); }
-  @$pb.TagNumber(1)
-  $core.bool hasViewId() => $_has(0);
-  @$pb.TagNumber(1)
-  void clearViewId() => clearField(1);
-
-  @$pb.TagNumber(2)
-  $core.List<$core.int> get data => $_getN(1);
-  @$pb.TagNumber(2)
-  set data($core.List<$core.int> v) { $_setBytes(1, v); }
-  @$pb.TagNumber(2)
-  $core.bool hasData() => $_has(1);
-  @$pb.TagNumber(2)
-  void clearData() => clearField(2);
-}
-
diff --git a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pbjson.dart b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pbjson.dart
index 375680fc3a..860b0f05eb 100644
--- a/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pbjson.dart
+++ b/app_flowy/packages/flowy_sdk/lib/protobuf/flowy-workspace/view_update.pbjson.dart
@@ -48,14 +48,3 @@ const UpdateViewParams$json = const {
 
 /// Descriptor for `UpdateViewParams`. Decode as a `google.protobuf.DescriptorProto`.
 final $typed_data.Uint8List updateViewParamsDescriptor = $convert.base64Decode('ChBVcGRhdGVWaWV3UGFyYW1zEhcKB3ZpZXdfaWQYASABKAlSBnZpZXdJZBIUCgRuYW1lGAIgASgJSABSBG5hbWUSFAoEZGVzYxgDIAEoCUgBUgRkZXNjEh4KCXRodW1ibmFpbBgEIAEoCUgCUgl0aHVtYm5haWwSGwoIaXNfdHJhc2gYBSABKAhIA1IHaXNUcmFzaEINCgtvbmVfb2ZfbmFtZUINCgtvbmVfb2ZfZGVzY0ISChBvbmVfb2ZfdGh1bWJuYWlsQhEKD29uZV9vZl9pc190cmFzaA==');
-@$core.Deprecated('Use docDeltaRequestDescriptor instead')
-const DocDeltaRequest$json = const {
-  '1': 'DocDeltaRequest',
-  '2': const [
-    const {'1': 'view_id', '3': 1, '4': 1, '5': 9, '10': 'viewId'},
-    const {'1': 'data', '3': 2, '4': 1, '5': 12, '10': 'data'},
-  ],
-};
-
-/// Descriptor for `DocDeltaRequest`. Decode as a `google.protobuf.DescriptorProto`.
-final $typed_data.Uint8List docDeltaRequestDescriptor = $convert.base64Decode('Cg9Eb2NEZWx0YVJlcXVlc3QSFwoHdmlld19pZBgBIAEoCVIGdmlld0lkEhIKBGRhdGEYAiABKAxSBGRhdGE=');
diff --git a/backend/src/service/doc/edit_doc_context.rs b/backend/src/service/doc/edit_doc_context.rs
index 9b324c6b29..7e922e5190 100644
--- a/backend/src/service/doc/edit_doc_context.rs
+++ b/backend/src/service/doc/edit_doc_context.rs
@@ -1,11 +1,12 @@
 use crate::service::{
     doc::update_doc,
     util::md5,
-    ws::{entities::Socket, WsMessageAdaptor},
+    ws::{entities::Socket, WsClientData, WsMessageAdaptor, WsUser},
 };
 use actix_web::web::Data;
 use byteorder::{BigEndian, WriteBytesExt};
 use bytes::Bytes;
+use dashmap::DashMap;
 use flowy_document::{
     entities::ws::{WsDataType, WsDocumentData},
     protobuf::{Doc, RevType, Revision, UpdateDocParams},
@@ -20,48 +21,93 @@ use flowy_ws::WsMessage;
 use parking_lot::RwLock;
 use protobuf::Message;
 use sqlx::PgPool;
-use std::{convert::TryInto, sync::Arc, time::Duration};
+use std::{
+    convert::TryInto,
+    sync::{
+        atomic::{AtomicI64, Ordering::SeqCst},
+        Arc,
+    },
+    time::Duration,
+};
+
+struct EditUser {
+    user: Arc<WsUser>,
+    socket: Socket,
+}
 
 pub(crate) struct EditDocContext {
     doc_id: String,
-    rev_id: i64,
+    rev_id: AtomicI64,
     document: Arc<RwLock<Document>>,
     pg_pool: Data<PgPool>,
+    users: DashMap<String, EditUser>,
 }
 
 impl EditDocContext {
     pub(crate) fn new(doc: Doc, pg_pool: Data<PgPool>) -> Result<Self, ServerError> {
         let delta = Delta::from_bytes(&doc.data).map_err(internal_error)?;
         let document = Arc::new(RwLock::new(Document::from_delta(delta)));
+        let users = DashMap::new();
         Ok(Self {
             doc_id: doc.id.clone(),
-            rev_id: doc.rev_id,
+            rev_id: AtomicI64::new(doc.rev_id),
             document,
             pg_pool,
+            users,
         })
     }
 
-    #[tracing::instrument(level = "debug", skip(self, socket, revision))]
-    pub(crate) async fn apply_revision(&self, socket: Socket, revision: Revision) -> Result<(), ServerError> {
+    #[tracing::instrument(level = "debug", skip(self, client_data, revision))]
+    pub(crate) async fn apply_revision(
+        &self,
+        client_data: WsClientData,
+        revision: Revision,
+    ) -> Result<(), ServerError> {
         let _ = self.verify_md5(&revision)?;
+        // Rest EditUser for each client websocket message to keep the socket available.
+        let user = EditUser {
+            user: client_data.user.clone(),
+            socket: client_data.socket.clone(),
+        };
+        self.users.insert(client_data.user.id().to_owned(), user);
 
-        if self.rev_id > revision.rev_id {
-            let (cli_prime, server_prime) = self.compose(&revision.delta).map_err(internal_error)?;
+        log::debug!(
+            "cur_base_rev_id: {}, expect_base_rev_id: {} rev_id: {}",
+            self.rev_id.load(SeqCst),
+            revision.base_rev_id,
+            revision.rev_id
+        );
+
+        let cli_socket = client_data.socket;
+        let cur_rev_id = self.rev_id.load(SeqCst);
+        // Transform the revision if client rev_id less than server rev_id. Sending the
+        // prime delta to client.
+        if cur_rev_id > revision.rev_id {
+            let (cli_prime, server_prime) = self.transform(&revision.delta).map_err(internal_error)?;
             let _ = self.update_document_delta(server_prime)?;
 
             log::debug!("{} client delta: {}", self.doc_id, cli_prime.to_json());
             let cli_revision = self.mk_revision(revision.rev_id, cli_prime);
             let ws_cli_revision = mk_rev_ws_message(&self.doc_id, cli_revision);
-            socket.do_send(ws_cli_revision).map_err(internal_error)?;
+            cli_socket.do_send(ws_cli_revision).map_err(internal_error)?;
+            Ok(())
+        } else if cur_rev_id < revision.rev_id {
+            if cur_rev_id != revision.base_rev_id {
+                let missing_rev_range = revision.rev_id - cur_rev_id;
+                // TODO: pull the missing revs from client
+            } else {
+                let delta = Delta::from_bytes(&revision.delta).map_err(internal_error)?;
+                let _ = self.update_document_delta(delta)?;
+                cli_socket.do_send(mk_acked_ws_message(&revision));
+                self.rev_id.fetch_update(SeqCst, SeqCst, |_e| Some(revision.rev_id));
+
+                // Opti: save with multiple revisions
+                let _ = self.save_revision(&revision).await?;
+            }
+
             Ok(())
         } else {
-            let delta = Delta::from_bytes(&revision.delta).map_err(internal_error)?;
-            let _ = self.update_document_delta(delta)?;
-            socket.do_send(mk_acked_ws_message(&revision));
-
-            // Opti: save with multiple revisions
-            let _ = self.save_revision(&revision).await?;
-            Ok(())
+            log::error!("Client rev_id should not equal to server rev_id");
         }
     }
 
@@ -70,7 +116,7 @@ impl EditDocContext {
         let md5 = md5(&delta_data);
         let revision = Revision {
             base_rev_id,
-            rev_id: self.rev_id,
+            rev_id: self.rev_id.load(SeqCst),
             delta: delta_data,
             md5,
             doc_id: self.doc_id.to_string(),
@@ -81,10 +127,12 @@ impl EditDocContext {
     }
 
     #[tracing::instrument(level = "debug", skip(self, delta_data))]
-    fn compose(&self, delta_data: &Vec<u8>) -> Result<(Delta, Delta), OTError> {
-        log::debug!("{} document data: {}", self.doc_id, self.document.read().to_json());
+    fn transform(&self, delta_data: &Vec<u8>) -> Result<(Delta, Delta), OTError> {
+        log::debug!("Document: {}", self.document.read().to_json());
         let doc_delta = self.document.read().delta().clone();
         let cli_delta = Delta::from_bytes(delta_data)?;
+
+        log::debug!("Compose delta: {}", cli_delta);
         let (cli_prime, server_prime) = doc_delta.transform(&cli_delta)?;
 
         Ok((cli_prime, server_prime))
@@ -99,8 +147,7 @@ impl EditDocContext {
             },
             Some(mut write_guard) => {
                 let _ = write_guard.compose_delta(&delta).map_err(internal_error)?;
-
-                log::debug!("Document: {}", write_guard.to_plain_string());
+                log::debug!("Document: {}", write_guard.to_json());
             },
         }
         Ok(())
diff --git a/backend/src/service/doc/ws_handler.rs b/backend/src/service/doc/ws_handler.rs
index 18f9f18642..b4f8d521bd 100644
--- a/backend/src/service/doc/ws_handler.rs
+++ b/backend/src/service/doc/ws_handler.rs
@@ -6,6 +6,7 @@ use crate::service::{
 };
 use actix_web::web::Data;
 
+use crate::service::ws::WsUser;
 use flowy_document::protobuf::{QueryDocParams, Revision, WsDataType, WsDocumentData};
 use flowy_net::errors::ServerError;
 use parking_lot::{RwLock, RwLockUpgradableReadGuard};
@@ -53,22 +54,19 @@ impl EditDocManager {
 
     async fn handle(&self, client_data: WsClientData) -> Result<(), ServerError> {
         let document_data: WsDocumentData = parse_from_bytes(&client_data.data)?;
-
         match document_data.ty {
             WsDataType::Acked => {},
             WsDataType::Rev => {
                 let revision: Revision = parse_from_bytes(&document_data.data)?;
                 let edited_doc = self.get_edit_doc(&revision.doc_id).await?;
                 tokio::spawn(async move {
-                    match edited_doc
-                        .apply_revision(client_data.socket, revision)
-                        .await
-                    {
+                    match edited_doc.apply_revision(client_data, revision).await {
                         Ok(_) => {},
                         Err(e) => log::error!("Doc apply revision failed: {:?}", e),
                     }
                 });
             },
+            _ => {},
         }
 
         Ok(())
diff --git a/backend/src/service/ws/router.rs b/backend/src/service/ws/router.rs
index bd88dee75a..170b52a375 100644
--- a/backend/src/service/ws/router.rs
+++ b/backend/src/service/ws/router.rs
@@ -1,4 +1,4 @@
-use crate::service::ws::{WsBizHandlers, WsClient, WsServer};
+use crate::service::ws::{WsBizHandlers, WsClient, WsServer, WsUser};
 use actix::Addr;
 
 use crate::service::user::LoggedUser;
@@ -21,7 +21,8 @@ pub async fn establish_ws_connection(
 ) -> Result<HttpResponse, Error> {
     match LoggedUser::from_token(token.clone()) {
         Ok(user) => {
-            let client = WsClient::new(&user.user_id, server.get_ref().clone(), biz_handlers);
+            let ws_user = WsUser::new(user.clone());
+            let client = WsClient::new(ws_user, server.get_ref().clone(), biz_handlers);
             let result = ws::start(client, &request, payload);
             match result {
                 Ok(response) => Ok(response.into()),
diff --git a/backend/src/service/ws/ws_client.rs b/backend/src/service/ws/ws_client.rs
index 35cd713240..b173026eb4 100644
--- a/backend/src/service/ws/ws_client.rs
+++ b/backend/src/service/ws/ws_client.rs
@@ -1,11 +1,14 @@
 use crate::{
     config::{HEARTBEAT_INTERVAL, PING_TIMEOUT},
-    service::ws::{
-        entities::{Connect, Disconnect, SessionId, Socket},
-        WsBizHandler,
-        WsBizHandlers,
-        WsMessageAdaptor,
-        WsServer,
+    service::{
+        user::LoggedUser,
+        ws::{
+            entities::{Connect, Disconnect, SessionId, Socket},
+            WsBizHandler,
+            WsBizHandlers,
+            WsMessageAdaptor,
+            WsServer,
+        },
     },
 };
 use actix::*;
@@ -13,28 +16,35 @@ use actix_web::web::Data;
 use actix_web_actors::{ws, ws::Message::Text};
 use bytes::Bytes;
 use flowy_ws::WsMessage;
-use std::{convert::TryFrom, time::Instant};
+use std::{convert::TryFrom, sync::Arc, time::Instant};
+
+pub struct WsUser {
+    inner: LoggedUser,
+}
+
+impl WsUser {
+    pub fn new(inner: LoggedUser) -> Self { Self { inner } }
+
+    pub fn id(&self) -> &str { &self.inner.user_id }
+}
 
 pub struct WsClientData {
+    pub(crate) user: Arc<WsUser>,
     pub(crate) socket: Socket,
     pub(crate) data: Bytes,
 }
 
 pub struct WsClient {
-    session_id: SessionId,
+    user: Arc<WsUser>,
     server: Addr<WsServer>,
     biz_handlers: Data<WsBizHandlers>,
     hb: Instant,
 }
 
 impl WsClient {
-    pub fn new<T: Into<SessionId>>(
-        session_id: T,
-        server: Addr<WsServer>,
-        biz_handlers: Data<WsBizHandlers>,
-    ) -> Self {
+    pub fn new(user: WsUser, server: Addr<WsServer>, biz_handlers: Data<WsBizHandlers>) -> Self {
         Self {
-            session_id: session_id.into(),
+            user: Arc::new(user),
             server,
             biz_handlers,
             hb: Instant::now(),
@@ -45,7 +55,7 @@ impl WsClient {
         ctx.run_interval(HEARTBEAT_INTERVAL, |client, ctx| {
             if Instant::now().duration_since(client.hb) > PING_TIMEOUT {
                 client.server.do_send(Disconnect {
-                    sid: client.session_id.clone(),
+                    sid: client.user.id().into(),
                 });
                 ctx.stop();
             } else {
@@ -63,6 +73,7 @@ impl WsClient {
             },
             Some(handler) => {
                 let client_data = WsClientData {
+                    user: self.user.clone(),
                     socket,
                     data: Bytes::from(message.data),
                 };
@@ -84,7 +95,6 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsClient {
                 self.hb = Instant::now();
             },
             Ok(ws::Message::Binary(bytes)) => {
-                log::debug!(" Receive {} binary", &self.session_id);
                 let socket = ctx.address().recipient();
                 self.handle_binary_message(bytes, socket);
             },
@@ -98,11 +108,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsClient {
             Ok(ws::Message::Continuation(_)) => {},
             Ok(ws::Message::Nop) => {},
             Err(e) => {
-                log::error!(
-                    "[{}]: WebSocketStream protocol error {:?}",
-                    self.session_id,
-                    e
-                );
+                log::error!("[{}]: WebSocketStream protocol error {:?}", self.user.id(), e);
                 ctx.stop();
             },
         }
@@ -123,7 +129,7 @@ impl Actor for WsClient {
         let socket = ctx.address().recipient();
         let connect = Connect {
             socket,
-            sid: self.session_id.clone(),
+            sid: self.user.id().into(),
         };
         self.server
             .send(connect)
@@ -141,7 +147,7 @@ impl Actor for WsClient {
 
     fn stopping(&mut self, _: &mut Self::Context) -> Running {
         self.server.do_send(Disconnect {
-            sid: self.session_id.clone(),
+            sid: self.user.id().into(),
         });
 
         Running::Stop
diff --git a/rust-lib/flowy-derive/src/derive_cache/derive_cache.rs b/rust-lib/flowy-derive/src/derive_cache/derive_cache.rs
index f5d522689d..f07dd625bf 100644
--- a/rust-lib/flowy-derive/src/derive_cache/derive_cache.rs
+++ b/rust-lib/flowy-derive/src/derive_cache/derive_cache.rs
@@ -41,7 +41,6 @@ pub fn category_from_str(type_str: &str) -> TypeCategory {
         | "CurrentWorkspace"
         | "UpdateViewRequest"
         | "UpdateViewParams"
-        | "DocDeltaRequest"
         | "DeleteViewRequest"
         | "DeleteViewParams"
         | "QueryViewRequest"
diff --git a/rust-lib/flowy-document/src/entities/ws/ws.rs b/rust-lib/flowy-document/src/entities/ws/ws.rs
index ab553cabf5..55b03e6d41 100644
--- a/rust-lib/flowy-document/src/entities/ws/ws.rs
+++ b/rust-lib/flowy-document/src/entities/ws/ws.rs
@@ -6,8 +6,9 @@ use std::convert::TryInto;
 
 #[derive(Debug, Clone, ProtoBuf_Enum, Eq, PartialEq, Hash)]
 pub enum WsDataType {
-    Acked = 0,
-    Rev   = 1,
+    Acked    = 0,
+    Rev      = 1,
+    Conflict = 2,
 }
 
 impl std::default::Default for WsDataType {
diff --git a/rust-lib/flowy-document/src/protobuf/model/ws.rs b/rust-lib/flowy-document/src/protobuf/model/ws.rs
index 8273341aac..396c89d978 100644
--- a/rust-lib/flowy-document/src/protobuf/model/ws.rs
+++ b/rust-lib/flowy-document/src/protobuf/model/ws.rs
@@ -259,6 +259,7 @@ impl ::protobuf::reflect::ProtobufValue for WsDocumentData {
 pub enum WsDataType {
     Acked = 0,
     Rev = 1,
+    Conflict = 2,
 }
 
 impl ::protobuf::ProtobufEnum for WsDataType {
@@ -270,6 +271,7 @@ impl ::protobuf::ProtobufEnum for WsDataType {
         match value {
             0 => ::std::option::Option::Some(WsDataType::Acked),
             1 => ::std::option::Option::Some(WsDataType::Rev),
+            2 => ::std::option::Option::Some(WsDataType::Conflict),
             _ => ::std::option::Option::None
         }
     }
@@ -278,6 +280,7 @@ impl ::protobuf::ProtobufEnum for WsDataType {
         static values: &'static [WsDataType] = &[
             WsDataType::Acked,
             WsDataType::Rev,
+            WsDataType::Conflict,
         ];
         values
     }
@@ -308,23 +311,26 @@ impl ::protobuf::reflect::ProtobufValue for WsDataType {
 static file_descriptor_proto_data: &'static [u8] = b"\
     \n\x08ws.proto\"Q\n\x0eWsDocumentData\x12\x0e\n\x02id\x18\x01\x20\x01(\t\
     R\x02id\x12\x1b\n\x02ty\x18\x02\x20\x01(\x0e2\x0b.WsDataTypeR\x02ty\x12\
-    \x12\n\x04data\x18\x03\x20\x01(\x0cR\x04data*\x20\n\nWsDataType\x12\t\n\
-    \x05Acked\x10\0\x12\x07\n\x03Rev\x10\x01J\xb9\x02\n\x06\x12\x04\0\0\n\
-    \x01\n\x08\n\x01\x0c\x12\x03\0\0\x12\n\n\n\x02\x04\0\x12\x04\x02\0\x06\
-    \x01\n\n\n\x03\x04\0\x01\x12\x03\x02\x08\x16\n\x0b\n\x04\x04\0\x02\0\x12\
-    \x03\x03\x04\x12\n\x0c\n\x05\x04\0\x02\0\x05\x12\x03\x03\x04\n\n\x0c\n\
-    \x05\x04\0\x02\0\x01\x12\x03\x03\x0b\r\n\x0c\n\x05\x04\0\x02\0\x03\x12\
-    \x03\x03\x10\x11\n\x0b\n\x04\x04\0\x02\x01\x12\x03\x04\x04\x16\n\x0c\n\
-    \x05\x04\0\x02\x01\x06\x12\x03\x04\x04\x0e\n\x0c\n\x05\x04\0\x02\x01\x01\
-    \x12\x03\x04\x0f\x11\n\x0c\n\x05\x04\0\x02\x01\x03\x12\x03\x04\x14\x15\n\
-    \x0b\n\x04\x04\0\x02\x02\x12\x03\x05\x04\x13\n\x0c\n\x05\x04\0\x02\x02\
-    \x05\x12\x03\x05\x04\t\n\x0c\n\x05\x04\0\x02\x02\x01\x12\x03\x05\n\x0e\n\
-    \x0c\n\x05\x04\0\x02\x02\x03\x12\x03\x05\x11\x12\n\n\n\x02\x05\0\x12\x04\
-    \x07\0\n\x01\n\n\n\x03\x05\0\x01\x12\x03\x07\x05\x0f\n\x0b\n\x04\x05\0\
-    \x02\0\x12\x03\x08\x04\x0e\n\x0c\n\x05\x05\0\x02\0\x01\x12\x03\x08\x04\t\
-    \n\x0c\n\x05\x05\0\x02\0\x02\x12\x03\x08\x0c\r\n\x0b\n\x04\x05\0\x02\x01\
-    \x12\x03\t\x04\x0c\n\x0c\n\x05\x05\0\x02\x01\x01\x12\x03\t\x04\x07\n\x0c\
-    \n\x05\x05\0\x02\x01\x02\x12\x03\t\n\x0bb\x06proto3\
+    \x12\n\x04data\x18\x03\x20\x01(\x0cR\x04data*.\n\nWsDataType\x12\t\n\x05\
+    Acked\x10\0\x12\x07\n\x03Rev\x10\x01\x12\x0c\n\x08Conflict\x10\x02J\xe2\
+    \x02\n\x06\x12\x04\0\0\x0b\x01\n\x08\n\x01\x0c\x12\x03\0\0\x12\n\n\n\x02\
+    \x04\0\x12\x04\x02\0\x06\x01\n\n\n\x03\x04\0\x01\x12\x03\x02\x08\x16\n\
+    \x0b\n\x04\x04\0\x02\0\x12\x03\x03\x04\x12\n\x0c\n\x05\x04\0\x02\0\x05\
+    \x12\x03\x03\x04\n\n\x0c\n\x05\x04\0\x02\0\x01\x12\x03\x03\x0b\r\n\x0c\n\
+    \x05\x04\0\x02\0\x03\x12\x03\x03\x10\x11\n\x0b\n\x04\x04\0\x02\x01\x12\
+    \x03\x04\x04\x16\n\x0c\n\x05\x04\0\x02\x01\x06\x12\x03\x04\x04\x0e\n\x0c\
+    \n\x05\x04\0\x02\x01\x01\x12\x03\x04\x0f\x11\n\x0c\n\x05\x04\0\x02\x01\
+    \x03\x12\x03\x04\x14\x15\n\x0b\n\x04\x04\0\x02\x02\x12\x03\x05\x04\x13\n\
+    \x0c\n\x05\x04\0\x02\x02\x05\x12\x03\x05\x04\t\n\x0c\n\x05\x04\0\x02\x02\
+    \x01\x12\x03\x05\n\x0e\n\x0c\n\x05\x04\0\x02\x02\x03\x12\x03\x05\x11\x12\
+    \n\n\n\x02\x05\0\x12\x04\x07\0\x0b\x01\n\n\n\x03\x05\0\x01\x12\x03\x07\
+    \x05\x0f\n\x0b\n\x04\x05\0\x02\0\x12\x03\x08\x04\x0e\n\x0c\n\x05\x05\0\
+    \x02\0\x01\x12\x03\x08\x04\t\n\x0c\n\x05\x05\0\x02\0\x02\x12\x03\x08\x0c\
+    \r\n\x0b\n\x04\x05\0\x02\x01\x12\x03\t\x04\x0c\n\x0c\n\x05\x05\0\x02\x01\
+    \x01\x12\x03\t\x04\x07\n\x0c\n\x05\x05\0\x02\x01\x02\x12\x03\t\n\x0b\n\
+    \x0b\n\x04\x05\0\x02\x02\x12\x03\n\x04\x11\n\x0c\n\x05\x05\0\x02\x02\x01\
+    \x12\x03\n\x04\x0c\n\x0c\n\x05\x05\0\x02\x02\x02\x12\x03\n\x0f\x10b\x06p\
+    roto3\
 ";
 
 static file_descriptor_proto_lazy: ::protobuf::rt::LazyV2<::protobuf::descriptor::FileDescriptorProto> = ::protobuf::rt::LazyV2::INIT;
diff --git a/rust-lib/flowy-document/src/protobuf/proto/ws.proto b/rust-lib/flowy-document/src/protobuf/proto/ws.proto
index a80f4ddac9..36a7b051b6 100644
--- a/rust-lib/flowy-document/src/protobuf/proto/ws.proto
+++ b/rust-lib/flowy-document/src/protobuf/proto/ws.proto
@@ -8,4 +8,5 @@ message WsDocumentData {
 enum WsDataType {
     Acked = 0;
     Rev = 1;
+    Conflict = 2;
 }
diff --git a/rust-lib/flowy-document/src/services/cache.rs b/rust-lib/flowy-document/src/services/cache.rs
index 2740ad2af0..361db88550 100644
--- a/rust-lib/flowy-document/src/services/cache.rs
+++ b/rust-lib/flowy-document/src/services/cache.rs
@@ -22,7 +22,7 @@ impl DocCache {
     }
 
     pub(crate) fn set(&self, doc: Arc<EditDocContext>) {
-        let doc_id = doc.id.clone();
+        let doc_id = doc.doc_id.clone();
         if self.inner.contains_key(&doc_id) {
             log::warn!("Doc:{} already exists in cache", &doc_id);
         }
diff --git a/rust-lib/flowy-document/src/services/doc/doc_controller.rs b/rust-lib/flowy-document/src/services/doc/doc_controller.rs
index 9fe2f061e2..a734e43509 100644
--- a/rust-lib/flowy-document/src/services/doc/doc_controller.rs
+++ b/rust-lib/flowy-document/src/services/doc/doc_controller.rs
@@ -1,5 +1,5 @@
 use crate::{
-    entities::doc::{CreateDocParams, Doc, DocDelta, QueryDocParams, UpdateDocParams},
+    entities::doc::{CreateDocParams, Doc, DocDelta, QueryDocParams},
     errors::{internal_error, DocError},
     module::DocumentUser,
     services::{
@@ -21,7 +21,6 @@ use tokio::time::{interval, Duration};
 pub(crate) struct DocController {
     server: Server,
     doc_sql: Arc<DocTableSql>,
-    op_sql: Arc<OpTableSql>,
     ws: Arc<RwLock<WsDocumentManager>>,
     cache: Arc<DocCache>,
     user: Arc<dyn DocumentUser>,
@@ -30,24 +29,14 @@ pub(crate) struct DocController {
 impl DocController {
     pub(crate) fn new(server: Server, user: Arc<dyn DocumentUser>, ws: Arc<RwLock<WsDocumentManager>>) -> Self {
         let doc_sql = Arc::new(DocTableSql {});
-        let op_sql = Arc::new(OpTableSql {});
         let cache = Arc::new(DocCache::new());
-
         let controller = Self {
             server,
             doc_sql,
-            op_sql,
             user,
             ws,
             cache: cache.clone(),
         };
-
-        // tokio::spawn(async move {
-        //     tokio::select! {
-        //         _ = event_loop(cache.clone()) => {},
-        //     }
-        // });
-
         controller
     }
 
@@ -69,10 +58,8 @@ impl DocController {
         pool: Arc<ConnectionPool>,
     ) -> Result<Arc<EditDocContext>, DocError> {
         if self.cache.is_opened(&params.doc_id) == false {
-            return match self._open(params, pool).await {
-                Ok(doc) => Ok(doc),
-                Err(error) => Err(error),
-            };
+            let edit_ctx = self.make_edit_context(&params.doc_id, pool.clone()).await?;
+            return Ok(edit_ctx);
         }
 
         let edit_doc_ctx = self.cache.get(&params.doc_id)?;
@@ -105,40 +92,6 @@ impl DocController {
 }
 
 impl DocController {
-    #[tracing::instrument(level = "debug", skip(self, params), err)]
-    fn update_doc_on_server(&self, params: UpdateDocParams) -> Result<(), DocError> {
-        let token = self.user.token()?;
-        let server = self.server.clone();
-        tokio::spawn(async move {
-            match server.update_doc(&token, params).await {
-                Ok(_) => {},
-                Err(e) => {
-                    // TODO: retry?
-                    log::error!("Update doc failed: {}", e);
-                },
-            }
-        });
-        Ok(())
-    }
-
-    #[tracing::instrument(level = "debug", skip(self, pool), err)]
-    async fn read_doc_from_server(
-        &self,
-        params: QueryDocParams,
-        pool: Arc<ConnectionPool>,
-    ) -> Result<Arc<EditDocContext>, DocError> {
-        let token = self.user.token()?;
-        match self.server.read_doc(&token, params).await? {
-            None => Err(DocError::not_found()),
-            Some(doc) => {
-                let edit = self.make_edit_context(doc.clone(), pool.clone())?;
-                let conn = &*(pool.get().map_err(internal_error)?);
-                let _ = self.doc_sql.create_doc_table(doc.into(), conn)?;
-                Ok(edit)
-            },
-        }
-    }
-
     #[tracing::instrument(level = "debug", skip(self), err)]
     fn delete_doc_on_server(&self, params: QueryDocParams) -> Result<(), DocError> {
         let token = self.user.token()?;
@@ -155,32 +108,45 @@ impl DocController {
         Ok(())
     }
 
-    async fn _open(&self, params: QueryDocParams, pool: Arc<ConnectionPool>) -> Result<Arc<EditDocContext>, DocError> {
-        match self.doc_sql.read_doc_table(&params.doc_id, pool.clone()) {
-            Ok(doc_table) => Ok(self.make_edit_context(doc_table.into(), pool.clone())?),
+    async fn make_edit_context(
+        &self,
+        doc_id: &str,
+        pool: Arc<ConnectionPool>,
+    ) -> Result<Arc<EditDocContext>, DocError> {
+        // Opti: require upgradable_read lock and then upgrade to write lock using
+        // RwLockUpgradableReadGuard::upgrade(xx) of ws
+        let delta = self.read_doc(doc_id, pool.clone()).await?;
+        let ws_sender = self.ws.read().sender();
+        let edit_ctx = Arc::new(EditDocContext::new(&doc_id, delta, pool, ws_sender).await?);
+        self.ws.write().register_handler(&doc_id, edit_ctx.clone());
+        self.cache.set(edit_ctx.clone());
+        Ok(edit_ctx)
+    }
+
+    #[tracing::instrument(level = "debug", skip(self, pool), err)]
+    async fn read_doc(&self, doc_id: &str, pool: Arc<ConnectionPool>) -> Result<Delta, DocError> {
+        match self.doc_sql.read_doc_table(doc_id, pool.clone()) {
+            Ok(doc_table) => Ok(Delta::from_bytes(doc_table.data)?),
             Err(error) => {
                 if error.is_record_not_found() {
-                    log::debug!("Doc:{} don't exist, reading from server", params.doc_id);
-                    Ok(self.read_doc_from_server(params, pool.clone()).await?)
+                    let token = self.user.token()?;
+                    let params = QueryDocParams {
+                        doc_id: doc_id.to_string(),
+                    };
+                    match self.server.read_doc(&token, params).await? {
+                        None => Err(DocError::not_found()),
+                        Some(doc) => {
+                            let conn = &*pool.get().map_err(internal_error)?;
+                            let _ = self.doc_sql.create_doc_table(doc.clone().into(), conn)?;
+                            Ok(Delta::from_bytes(doc.data)?)
+                        },
+                    }
                 } else {
                     return Err(error);
                 }
             },
         }
     }
-
-    fn make_edit_context(&self, doc: Doc, pool: Arc<ConnectionPool>) -> Result<Arc<EditDocContext>, DocError> {
-        // Opti: require upgradable_read lock and then upgrade to write lock using
-        // RwLockUpgradableReadGuard::upgrade(xx) of ws
-        let doc_id = doc.id.clone();
-        let delta = Delta::from_bytes(&doc.data)?;
-        let ws_sender = self.ws.read().sender();
-        let rev_manager = RevisionManager::new(&doc_id, doc.rev_id, self.op_sql.clone(), pool, ws_sender);
-        let edit_ctx = Arc::new(EditDocContext::new(&doc_id, delta, rev_manager)?);
-        self.ws.write().register_handler(&doc_id, edit_ctx.clone());
-        self.cache.set(edit_ctx.clone());
-        Ok(edit_ctx)
-    }
 }
 
 #[allow(dead_code)]
diff --git a/rust-lib/flowy-document/src/services/doc/edit_doc_context.rs b/rust-lib/flowy-document/src/services/doc/edit_doc_context.rs
index 10a2d473ed..162bd6df2d 100644
--- a/rust-lib/flowy-document/src/services/doc/edit_doc_context.rs
+++ b/rust-lib/flowy-document/src/services/doc/edit_doc_context.rs
@@ -6,13 +6,18 @@ use crate::{
     errors::*,
     services::{
         doc::{rev_manager::RevisionManager, Document},
-        util::bytes_to_rev_id,
+        util::{bytes_to_rev_id, md5},
         ws::WsDocumentHandler,
     },
-    sql_tables::{OpTableSql, RevTable},
 };
 use bytes::Bytes;
 
+use crate::{
+    entities::doc::RevType,
+    services::ws::WsDocumentSender,
+    sql_tables::{doc::DocTableSql, DocTableChangeset},
+};
+use flowy_database::ConnectionPool;
 use flowy_ot::core::Delta;
 use parking_lot::RwLock;
 use std::{convert::TryFrom, sync::Arc};
@@ -20,27 +25,34 @@ use std::{convert::TryFrom, sync::Arc};
 pub type DocId = String;
 
 pub(crate) struct EditDocContext {
-    pub(crate) id: DocId,
+    pub(crate) doc_id: DocId,
     document: Arc<RwLock<Document>>,
     rev_manager: Arc<RevisionManager>,
+    pool: Arc<ConnectionPool>,
 }
 
 impl EditDocContext {
-    pub(crate) fn new(doc_id: &str, delta: Delta, rev_manager: RevisionManager) -> Result<Self, DocError> {
-        let id = doc_id.to_owned();
-        let rev_manager = Arc::new(rev_manager);
+    pub(crate) async fn new(
+        doc_id: &str,
+        delta: Delta,
+        pool: Arc<ConnectionPool>,
+        ws_sender: Arc<dyn WsDocumentSender>,
+    ) -> Result<Self, DocError> {
+        let doc_id = doc_id.to_owned();
+        let rev_manager = Arc::new(RevisionManager::new(&doc_id, 1, pool.clone(), ws_sender));
         let document = Arc::new(RwLock::new(Document::from_delta(delta)));
         let edit_context = Self {
-            id,
+            doc_id,
             document,
             rev_manager,
+            pool,
         };
         Ok(edit_context)
     }
 
     pub(crate) fn doc(&self) -> Doc {
         Doc {
-            id: self.id.clone(),
+            id: self.doc_id.clone(),
             data: self.document.read().to_json(),
             rev_id: self.rev_manager.rev_id(),
         }
@@ -48,12 +60,63 @@ impl EditDocContext {
 
     #[tracing::instrument(level = "debug", skip(self, data), err)]
     pub(crate) fn compose_local_delta(&self, data: Bytes) -> Result<(), DocError> {
-        let delta = Delta::from_bytes(&data)?;
-        self.document.write().compose_delta(&delta)?;
-        self.rev_manager.add_delta(data);
+        let (base_rev_id, rev_id) = self.rev_manager.next_rev_id();
+        let revision = Revision::new(
+            base_rev_id,
+            rev_id,
+            data.to_vec(),
+            md5(&data),
+            self.doc_id.clone(),
+            RevType::Local,
+        );
 
+        let _ = self.update_document(&revision)?;
+        self.rev_manager.add_revision(revision);
         Ok(())
     }
+
+    #[tracing::instrument(level = "debug", skip(self, revision), err)]
+    pub fn update_document(&self, revision: &Revision) -> Result<(), DocError> {
+        let delta = Delta::from_bytes(&revision.delta)?;
+        self.document.write().compose_delta(&delta)?;
+        let data = self.document.read().to_json();
+        let changeset = DocTableChangeset {
+            id: self.doc_id.clone(),
+            data,
+            revision: revision.rev_id,
+        };
+
+        let sql = DocTableSql {};
+        let conn = self.pool.get().map_err(internal_error)?;
+        sql.update_doc_table(changeset, &*conn);
+        Ok(())
+    }
+
+    #[tracing::instrument(level = "debug", skip(self), err)]
+    fn compose_remote_delta(&self) -> Result<(), DocError> {
+        self.rev_manager.next_compose_revision(|revision| {
+            let _ = self.update_document(revision)?;
+            log::debug!("😁Document: {:?}", self.document.read().to_plain_string());
+            Ok(())
+        });
+        Ok(())
+    }
+
+    // #[tracing::instrument(level = "debug", skip(self, params), err)]
+    // fn update_doc_on_server(&self, params: UpdateDocParams) -> Result<(),
+    //     DocError> {     let token = self.user.token()?;
+    //     let server = self.server.clone();
+    //     tokio::spawn(async move {
+    //         match server.update_doc(&token, params).await {
+    //             Ok(_) => {},
+    //             Err(e) => {
+    //                 // TODO: retry?
+    //                 log::error!("Update doc failed: {}", e);
+    //             },
+    //         }
+    //     });
+    //     Ok(())
+    // }
 }
 
 impl WsDocumentHandler for EditDocContext {
@@ -64,16 +127,13 @@ impl WsDocumentHandler for EditDocContext {
                     let bytes = Bytes::from(doc_data.data);
                     let revision = Revision::try_from(bytes)?;
                     self.rev_manager.add_revision(revision);
-                    self.rev_manager.next_compose_delta(|delta| {
-                        let _ = self.document.write().compose_delta(delta)?;
-                        log::debug!("😁Document: {:?}", self.document.read().to_plain_string());
-                        Ok(())
-                    });
+                    let _ = self.compose_remote_delta()?;
                 },
                 WsDataType::Acked => {
                     let rev_id = bytes_to_rev_id(doc_data.data)?;
                     self.rev_manager.remove(rev_id);
                 },
+                _ => {},
             }
             Result::<(), DocError>::Ok(())
         };
diff --git a/rust-lib/flowy-document/src/services/doc/rev_manager.rs b/rust-lib/flowy-document/src/services/doc/rev_manager.rs
index e1c1c0d2e8..1c42fc03c2 100644
--- a/rust-lib/flowy-document/src/services/doc/rev_manager.rs
+++ b/rust-lib/flowy-document/src/services/doc/rev_manager.rs
@@ -2,14 +2,14 @@ use crate::{
     entities::doc::{RevType, Revision},
     errors::{internal_error, DocError},
     services::{
-        util::{md5, RevIdCounter},
+        util::RevIdCounter,
         ws::{WsDocumentHandler, WsDocumentSender},
     },
     sql_tables::{OpTableSql, RevTable},
 };
-use bytes::Bytes;
+
 use flowy_database::ConnectionPool;
-use flowy_ot::core::Delta;
+
 use parking_lot::RwLock;
 use std::{
     collections::{BTreeMap, VecDeque},
@@ -29,13 +29,8 @@ pub struct RevisionManager {
 }
 
 impl RevisionManager {
-    pub fn new(
-        doc_id: &str,
-        rev_id: i64,
-        op_sql: Arc<OpTableSql>,
-        pool: Arc<ConnectionPool>,
-        ws_sender: Arc<dyn WsDocumentSender>,
-    ) -> Self {
+    pub fn new(doc_id: &str, rev_id: i64, pool: Arc<ConnectionPool>, ws_sender: Arc<dyn WsDocumentSender>) -> Self {
+        let op_sql = Arc::new(OpTableSql {});
         let rev_id_counter = RevIdCounter::new(rev_id);
         let local_rev_cache = Arc::new(RwLock::new(BTreeMap::new()));
         let remote_rev_cache = RwLock::new(VecDeque::new());
@@ -51,39 +46,21 @@ impl RevisionManager {
         }
     }
 
-    pub fn next_compose_delta<F>(&self, mut f: F)
+    pub fn next_compose_revision<F>(&self, mut f: F)
     where
-        F: FnMut(&Delta) -> Result<(), DocError>,
+        F: FnMut(&Revision) -> Result<(), DocError>,
     {
         if let Some(rev) = self.remote_rev_cache.write().pop_front() {
-            match Delta::from_bytes(&rev.delta) {
-                Ok(delta) => match f(&delta) {
-                    Ok(_) => {},
-                    Err(e) => {
-                        log::error!("{}", e);
-                        self.remote_rev_cache.write().push_front(rev);
-                    },
+            match f(&rev) {
+                Ok(_) => {},
+                Err(e) => {
+                    log::error!("{}", e);
+                    self.remote_rev_cache.write().push_front(rev);
                 },
-                Err(_) => {},
             }
         }
     }
 
-    #[tracing::instrument(level = "debug", skip(self, delta_data))]
-    pub fn add_delta(&self, delta_data: Bytes) -> Result<(), DocError> {
-        let (base_rev_id, rev_id) = self.next_rev_id();
-        let revision = Revision::new(
-            base_rev_id,
-            rev_id,
-            delta_data.to_vec(),
-            md5(&delta_data),
-            self.doc_id.clone(),
-            RevType::Local,
-        );
-        let _ = self.add_revision(revision)?;
-        Ok(())
-    }
-
     #[tracing::instrument(level = "debug", skip(self, revision))]
     pub fn add_revision(&self, revision: Revision) -> Result<(), DocError> {
         match revision.ty {
diff --git a/rust-lib/flowy-document/src/sql_tables/doc/doc_sql.rs b/rust-lib/flowy-document/src/sql_tables/doc/doc_sql.rs
index a0d5077c24..f434c42273 100644
--- a/rust-lib/flowy-document/src/sql_tables/doc/doc_sql.rs
+++ b/rust-lib/flowy-document/src/sql_tables/doc/doc_sql.rs
@@ -18,21 +18,29 @@ impl DocTableSql {
         Ok(())
     }
 
-    pub(crate) fn update_doc_table(&self, changeset: DocTableChangeset, conn: &SqliteConnection) -> Result<(), DocError> {
+    pub(crate) fn update_doc_table(
+        &self,
+        changeset: DocTableChangeset,
+        conn: &SqliteConnection,
+    ) -> Result<(), DocError> {
         diesel_update_table!(doc_table, changeset, conn);
         Ok(())
     }
 
     pub(crate) fn read_doc_table(&self, doc_id: &str, pool: Arc<ConnectionPool>) -> Result<DocTable, DocError> {
         let conn = &*pool.get().map_err(internal_error)?;
-        let doc_table = dsl::doc_table.filter(doc_table::id.eq(doc_id)).first::<DocTable>(conn)?;
+        let doc_table = dsl::doc_table
+            .filter(doc_table::id.eq(doc_id))
+            .first::<DocTable>(conn)?;
 
         Ok(doc_table)
     }
 
     #[allow(dead_code)]
     pub(crate) fn delete_doc(&self, doc_id: &str, conn: &SqliteConnection) -> Result<DocTable, DocError> {
-        let doc_table = dsl::doc_table.filter(doc_table::id.eq(doc_id)).first::<DocTable>(conn)?;
+        let doc_table = dsl::doc_table
+            .filter(doc_table::id.eq(doc_id))
+            .first::<DocTable>(conn)?;
         diesel_delete_table!(doc_table, doc_id, conn);
         Ok(doc_table)
     }
diff --git a/rust-lib/flowy-document/src/sql_tables/doc/doc_table.rs b/rust-lib/flowy-document/src/sql_tables/doc/doc_table.rs
index 0f1cffd3f8..b443fda96b 100644
--- a/rust-lib/flowy-document/src/sql_tables/doc/doc_table.rs
+++ b/rust-lib/flowy-document/src/sql_tables/doc/doc_table.rs
@@ -1,4 +1,4 @@
-use crate::entities::doc::{Doc, UpdateDocParams};
+use crate::entities::doc::Doc;
 use flowy_database::schema::doc_table;
 
 #[derive(PartialEq, Clone, Debug, Queryable, Identifiable, Insertable, Associations)]
@@ -24,15 +24,7 @@ impl DocTable {
 pub(crate) struct DocTableChangeset {
     pub id: String,
     pub data: String,
-}
-
-impl DocTableChangeset {
-    pub(crate) fn new(params: UpdateDocParams) -> Self {
-        Self {
-            id: params.doc_id,
-            data: params.data,
-        }
-    }
+    pub revision: i64,
 }
 
 impl std::convert::Into<Doc> for DocTable {
diff --git a/rust-lib/flowy-document/tests/editor/op_test.rs b/rust-lib/flowy-document/tests/editor/op_test.rs
index de7bb3e8d7..b0d42b5b7d 100644
--- a/rust-lib/flowy-document/tests/editor/op_test.rs
+++ b/rust-lib/flowy-document/tests/editor/op_test.rs
@@ -1,6 +1,6 @@
 use crate::editor::{Rng, TestBuilder, TestOp::*};
 use bytecount::num_chars;
-use flowy_document::services::doc::PlainDoc;
+use flowy_document::services::doc::{FlowyDoc, PlainDoc};
 use flowy_ot::core::*;
 
 #[test]
@@ -715,3 +715,16 @@ fn delta_invert_attribute_delta_with_attribute_delta() {
     ];
     TestBuilder::new().run_script::<PlainDoc>(ops);
 }
+
+#[test]
+#[should_panic]
+fn delta_compose_with_missing_delta() {
+    let ops = vec![
+        Insert(0, "123", 0),
+        Insert(0, "4", 3),
+        DocComposeDelta(1, 0),
+        AssertDocJson(0, r#"[{"insert":"1234\n"}]"#),
+        AssertStr(1, r#"4\n"#),
+    ];
+    TestBuilder::new().run_script::<FlowyDoc>(ops);
+}
diff --git a/rust-lib/flowy-ot/src/core/delta/delta.rs b/rust-lib/flowy-ot/src/core/delta/delta.rs
index 1a6e6a53fd..61604103c7 100644
--- a/rust-lib/flowy-ot/src/core/delta/delta.rs
+++ b/rust-lib/flowy-ot/src/core/delta/delta.rs
@@ -307,7 +307,12 @@ impl OperationTransformable for Delta {
         Self: Sized,
     {
         if self.base_len != other.base_len {
-            return Err(ErrorBuilder::new(OTErrorCode::IncompatibleLength).build());
+            return Err(ErrorBuilder::new(OTErrorCode::IncompatibleLength)
+                .msg(format!(
+                    "cur base length: {}, other base length: {}",
+                    self.base_len, other.base_len
+                ))
+                .build());
         }
 
         let mut a_prime = Delta::default();
diff --git a/rust-lib/flowy-workspace/src/protobuf/model/view_update.rs b/rust-lib/flowy-workspace/src/protobuf/model/view_update.rs
index 2bc92362e7..77ac106c2d 100644
--- a/rust-lib/flowy-workspace/src/protobuf/model/view_update.rs
+++ b/rust-lib/flowy-workspace/src/protobuf/model/view_update.rs
@@ -943,207 +943,6 @@ impl ::protobuf::reflect::ProtobufValue for UpdateViewParams {
     }
 }
 
-#[derive(PartialEq,Clone,Default)]
-pub struct DocDeltaRequest {
-    // message fields
-    pub view_id: ::std::string::String,
-    pub data: ::std::vec::Vec<u8>,
-    // special fields
-    pub unknown_fields: ::protobuf::UnknownFields,
-    pub cached_size: ::protobuf::CachedSize,
-}
-
-impl<'a> ::std::default::Default for &'a DocDeltaRequest {
-    fn default() -> &'a DocDeltaRequest {
-        <DocDeltaRequest as ::protobuf::Message>::default_instance()
-    }
-}
-
-impl DocDeltaRequest {
-    pub fn new() -> DocDeltaRequest {
-        ::std::default::Default::default()
-    }
-
-    // string view_id = 1;
-
-
-    pub fn get_view_id(&self) -> &str {
-        &self.view_id
-    }
-    pub fn clear_view_id(&mut self) {
-        self.view_id.clear();
-    }
-
-    // Param is passed by value, moved
-    pub fn set_view_id(&mut self, v: ::std::string::String) {
-        self.view_id = v;
-    }
-
-    // Mutable pointer to the field.
-    // If field is not initialized, it is initialized with default value first.
-    pub fn mut_view_id(&mut self) -> &mut ::std::string::String {
-        &mut self.view_id
-    }
-
-    // Take field
-    pub fn take_view_id(&mut self) -> ::std::string::String {
-        ::std::mem::replace(&mut self.view_id, ::std::string::String::new())
-    }
-
-    // bytes data = 2;
-
-
-    pub fn get_data(&self) -> &[u8] {
-        &self.data
-    }
-    pub fn clear_data(&mut self) {
-        self.data.clear();
-    }
-
-    // Param is passed by value, moved
-    pub fn set_data(&mut self, v: ::std::vec::Vec<u8>) {
-        self.data = v;
-    }
-
-    // Mutable pointer to the field.
-    // If field is not initialized, it is initialized with default value first.
-    pub fn mut_data(&mut self) -> &mut ::std::vec::Vec<u8> {
-        &mut self.data
-    }
-
-    // Take field
-    pub fn take_data(&mut self) -> ::std::vec::Vec<u8> {
-        ::std::mem::replace(&mut self.data, ::std::vec::Vec::new())
-    }
-}
-
-impl ::protobuf::Message for DocDeltaRequest {
-    fn is_initialized(&self) -> bool {
-        true
-    }
-
-    fn merge_from(&mut self, is: &mut ::protobuf::CodedInputStream<'_>) -> ::protobuf::ProtobufResult<()> {
-        while !is.eof()? {
-            let (field_number, wire_type) = is.read_tag_unpack()?;
-            match field_number {
-                1 => {
-                    ::protobuf::rt::read_singular_proto3_string_into(wire_type, is, &mut self.view_id)?;
-                },
-                2 => {
-                    ::protobuf::rt::read_singular_proto3_bytes_into(wire_type, is, &mut self.data)?;
-                },
-                _ => {
-                    ::protobuf::rt::read_unknown_or_skip_group(field_number, wire_type, is, self.mut_unknown_fields())?;
-                },
-            };
-        }
-        ::std::result::Result::Ok(())
-    }
-
-    // Compute sizes of nested messages
-    #[allow(unused_variables)]
-    fn compute_size(&self) -> u32 {
-        let mut my_size = 0;
-        if !self.view_id.is_empty() {
-            my_size += ::protobuf::rt::string_size(1, &self.view_id);
-        }
-        if !self.data.is_empty() {
-            my_size += ::protobuf::rt::bytes_size(2, &self.data);
-        }
-        my_size += ::protobuf::rt::unknown_fields_size(self.get_unknown_fields());
-        self.cached_size.set(my_size);
-        my_size
-    }
-
-    fn write_to_with_cached_sizes(&self, os: &mut ::protobuf::CodedOutputStream<'_>) -> ::protobuf::ProtobufResult<()> {
-        if !self.view_id.is_empty() {
-            os.write_string(1, &self.view_id)?;
-        }
-        if !self.data.is_empty() {
-            os.write_bytes(2, &self.data)?;
-        }
-        os.write_unknown_fields(self.get_unknown_fields())?;
-        ::std::result::Result::Ok(())
-    }
-
-    fn get_cached_size(&self) -> u32 {
-        self.cached_size.get()
-    }
-
-    fn get_unknown_fields(&self) -> &::protobuf::UnknownFields {
-        &self.unknown_fields
-    }
-
-    fn mut_unknown_fields(&mut self) -> &mut ::protobuf::UnknownFields {
-        &mut self.unknown_fields
-    }
-
-    fn as_any(&self) -> &dyn (::std::any::Any) {
-        self as &dyn (::std::any::Any)
-    }
-    fn as_any_mut(&mut self) -> &mut dyn (::std::any::Any) {
-        self as &mut dyn (::std::any::Any)
-    }
-    fn into_any(self: ::std::boxed::Box<Self>) -> ::std::boxed::Box<dyn (::std::any::Any)> {
-        self
-    }
-
-    fn descriptor(&self) -> &'static ::protobuf::reflect::MessageDescriptor {
-        Self::descriptor_static()
-    }
-
-    fn new() -> DocDeltaRequest {
-        DocDeltaRequest::new()
-    }
-
-    fn descriptor_static() -> &'static ::protobuf::reflect::MessageDescriptor {
-        static descriptor: ::protobuf::rt::LazyV2<::protobuf::reflect::MessageDescriptor> = ::protobuf::rt::LazyV2::INIT;
-        descriptor.get(|| {
-            let mut fields = ::std::vec::Vec::new();
-            fields.push(::protobuf::reflect::accessor::make_simple_field_accessor::<_, ::protobuf::types::ProtobufTypeString>(
-                "view_id",
-                |m: &DocDeltaRequest| { &m.view_id },
-                |m: &mut DocDeltaRequest| { &mut m.view_id },
-            ));
-            fields.push(::protobuf::reflect::accessor::make_simple_field_accessor::<_, ::protobuf::types::ProtobufTypeBytes>(
-                "data",
-                |m: &DocDeltaRequest| { &m.data },
-                |m: &mut DocDeltaRequest| { &mut m.data },
-            ));
-            ::protobuf::reflect::MessageDescriptor::new_pb_name::<DocDeltaRequest>(
-                "DocDeltaRequest",
-                fields,
-                file_descriptor_proto()
-            )
-        })
-    }
-
-    fn default_instance() -> &'static DocDeltaRequest {
-        static instance: ::protobuf::rt::LazyV2<DocDeltaRequest> = ::protobuf::rt::LazyV2::INIT;
-        instance.get(DocDeltaRequest::new)
-    }
-}
-
-impl ::protobuf::Clear for DocDeltaRequest {
-    fn clear(&mut self) {
-        self.view_id.clear();
-        self.data.clear();
-        self.unknown_fields.clear();
-    }
-}
-
-impl ::std::fmt::Debug for DocDeltaRequest {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
-        ::protobuf::text_format::fmt(self, f)
-    }
-}
-
-impl ::protobuf::reflect::ProtobufValue for DocDeltaRequest {
-    fn as_ref(&self) -> ::protobuf::reflect::ReflectValueRef {
-        ::protobuf::reflect::ReflectValueRef::Message(self)
-    }
-}
-
 static file_descriptor_proto_data: &'static [u8] = b"\
     \n\x11view_update.proto\"\xda\x01\n\x11UpdateViewRequest\x12\x17\n\x07vi\
     ew_id\x18\x01\x20\x01(\tR\x06viewId\x12\x14\n\x04name\x18\x02\x20\x01(\t\
@@ -1156,55 +955,47 @@ static file_descriptor_proto_data: &'static [u8] = b"\
     \x03\x20\x01(\tH\x01R\x04desc\x12\x1e\n\tthumbnail\x18\x04\x20\x01(\tH\
     \x02R\tthumbnail\x12\x1b\n\x08is_trash\x18\x05\x20\x01(\x08H\x03R\x07isT\
     rashB\r\n\x0bone_of_nameB\r\n\x0bone_of_descB\x12\n\x10one_of_thumbnailB\
-    \x11\n\x0fone_of_is_trash\">\n\x0fDocDeltaRequest\x12\x17\n\x07view_id\
-    \x18\x01\x20\x01(\tR\x06viewId\x12\x12\n\x04data\x18\x02\x20\x01(\x0cR\
-    \x04dataJ\xc6\x07\n\x06\x12\x04\0\0\x13\x01\n\x08\n\x01\x0c\x12\x03\0\0\
-    \x12\n\n\n\x02\x04\0\x12\x04\x02\0\x08\x01\n\n\n\x03\x04\0\x01\x12\x03\
-    \x02\x08\x19\n\x0b\n\x04\x04\0\x02\0\x12\x03\x03\x04\x17\n\x0c\n\x05\x04\
-    \0\x02\0\x05\x12\x03\x03\x04\n\n\x0c\n\x05\x04\0\x02\0\x01\x12\x03\x03\
-    \x0b\x12\n\x0c\n\x05\x04\0\x02\0\x03\x12\x03\x03\x15\x16\n\x0b\n\x04\x04\
-    \0\x08\0\x12\x03\x04\x04*\n\x0c\n\x05\x04\0\x08\0\x01\x12\x03\x04\n\x15\
-    \n\x0b\n\x04\x04\0\x02\x01\x12\x03\x04\x18(\n\x0c\n\x05\x04\0\x02\x01\
-    \x05\x12\x03\x04\x18\x1e\n\x0c\n\x05\x04\0\x02\x01\x01\x12\x03\x04\x1f#\
-    \n\x0c\n\x05\x04\0\x02\x01\x03\x12\x03\x04&'\n\x0b\n\x04\x04\0\x08\x01\
-    \x12\x03\x05\x04*\n\x0c\n\x05\x04\0\x08\x01\x01\x12\x03\x05\n\x15\n\x0b\
-    \n\x04\x04\0\x02\x02\x12\x03\x05\x18(\n\x0c\n\x05\x04\0\x02\x02\x05\x12\
-    \x03\x05\x18\x1e\n\x0c\n\x05\x04\0\x02\x02\x01\x12\x03\x05\x1f#\n\x0c\n\
-    \x05\x04\0\x02\x02\x03\x12\x03\x05&'\n\x0b\n\x04\x04\0\x08\x02\x12\x03\
-    \x06\x044\n\x0c\n\x05\x04\0\x08\x02\x01\x12\x03\x06\n\x1a\n\x0b\n\x04\
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-    \x02\x03\x03\x12\x03\x0601\n\x0b\n\x04\x04\0\x08\x03\x12\x03\x07\x040\n\
-    \x0c\n\x05\x04\0\x08\x03\x01\x12\x03\x07\n\x19\n\x0b\n\x04\x04\0\x02\x04\
-    \x12\x03\x07\x1c.\n\x0c\n\x05\x04\0\x02\x04\x05\x12\x03\x07\x1c\x20\n\
-    \x0c\n\x05\x04\0\x02\x04\x01\x12\x03\x07!)\n\x0c\n\x05\x04\0\x02\x04\x03\
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-    \n\x05\x04\x01\x02\0\x05\x12\x03\n\x04\n\n\x0c\n\x05\x04\x01\x02\0\x01\
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-    \n\x04\x04\x01\x08\0\x12\x03\x0b\x04*\n\x0c\n\x05\x04\x01\x08\0\x01\x12\
-    \x03\x0b\n\x15\n\x0b\n\x04\x04\x01\x02\x01\x12\x03\x0b\x18(\n\x0c\n\x05\
-    \x04\x01\x02\x01\x05\x12\x03\x0b\x18\x1e\n\x0c\n\x05\x04\x01\x02\x01\x01\
-    \x12\x03\x0b\x1f#\n\x0c\n\x05\x04\x01\x02\x01\x03\x12\x03\x0b&'\n\x0b\n\
-    \x04\x04\x01\x08\x01\x12\x03\x0c\x04*\n\x0c\n\x05\x04\x01\x08\x01\x01\
-    \x12\x03\x0c\n\x15\n\x0b\n\x04\x04\x01\x02\x02\x12\x03\x0c\x18(\n\x0c\n\
-    \x05\x04\x01\x02\x02\x05\x12\x03\x0c\x18\x1e\n\x0c\n\x05\x04\x01\x02\x02\
-    \x01\x12\x03\x0c\x1f#\n\x0c\n\x05\x04\x01\x02\x02\x03\x12\x03\x0c&'\n\
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-    \x01\x12\x03\r\n\x1a\n\x0b\n\x04\x04\x01\x02\x03\x12\x03\r\x1d2\n\x0c\n\
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-    \x0e\n\x19\n\x0b\n\x04\x04\x01\x02\x04\x12\x03\x0e\x1c.\n\x0c\n\x05\x04\
-    \x01\x02\x04\x05\x12\x03\x0e\x1c\x20\n\x0c\n\x05\x04\x01\x02\x04\x01\x12\
-    \x03\x0e!)\n\x0c\n\x05\x04\x01\x02\x04\x03\x12\x03\x0e,-\n\n\n\x02\x04\
-    \x02\x12\x04\x10\0\x13\x01\n\n\n\x03\x04\x02\x01\x12\x03\x10\x08\x17\n\
-    \x0b\n\x04\x04\x02\x02\0\x12\x03\x11\x04\x17\n\x0c\n\x05\x04\x02\x02\0\
-    \x05\x12\x03\x11\x04\n\n\x0c\n\x05\x04\x02\x02\0\x01\x12\x03\x11\x0b\x12\
-    \n\x0c\n\x05\x04\x02\x02\0\x03\x12\x03\x11\x15\x16\n\x0b\n\x04\x04\x02\
-    \x02\x01\x12\x03\x12\x04\x13\n\x0c\n\x05\x04\x02\x02\x01\x05\x12\x03\x12\
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-    \x02\x02\x01\x03\x12\x03\x12\x11\x12b\x06proto3\
+    \x11\n\x0fone_of_is_trashJ\xc0\x06\n\x06\x12\x04\0\0\x0f\x01\n\x08\n\x01\
+    \x0c\x12\x03\0\0\x12\n\n\n\x02\x04\0\x12\x04\x02\0\x08\x01\n\n\n\x03\x04\
+    \0\x01\x12\x03\x02\x08\x19\n\x0b\n\x04\x04\0\x02\0\x12\x03\x03\x04\x17\n\
+    \x0c\n\x05\x04\0\x02\0\x05\x12\x03\x03\x04\n\n\x0c\n\x05\x04\0\x02\0\x01\
+    \x12\x03\x03\x0b\x12\n\x0c\n\x05\x04\0\x02\0\x03\x12\x03\x03\x15\x16\n\
+    \x0b\n\x04\x04\0\x08\0\x12\x03\x04\x04*\n\x0c\n\x05\x04\0\x08\0\x01\x12\
+    \x03\x04\n\x15\n\x0b\n\x04\x04\0\x02\x01\x12\x03\x04\x18(\n\x0c\n\x05\
+    \x04\0\x02\x01\x05\x12\x03\x04\x18\x1e\n\x0c\n\x05\x04\0\x02\x01\x01\x12\
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+    \x04\0\x08\x01\x12\x03\x05\x04*\n\x0c\n\x05\x04\0\x08\x01\x01\x12\x03\
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+    \x03\x0e,-b\x06proto3\
 ";
 
 static file_descriptor_proto_lazy: ::protobuf::rt::LazyV2<::protobuf::descriptor::FileDescriptorProto> = ::protobuf::rt::LazyV2::INIT;
diff --git a/rust-lib/flowy-workspace/src/protobuf/proto/view_update.proto b/rust-lib/flowy-workspace/src/protobuf/proto/view_update.proto
index 37d575e072..7daacbb927 100644
--- a/rust-lib/flowy-workspace/src/protobuf/proto/view_update.proto
+++ b/rust-lib/flowy-workspace/src/protobuf/proto/view_update.proto
@@ -14,7 +14,3 @@ message UpdateViewParams {
     oneof one_of_thumbnail { string thumbnail = 4; };
     oneof one_of_is_trash { bool is_trash = 5; };
 }
-message DocDeltaRequest {
-    string view_id = 1;
-    bytes data = 2;
-}