diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 17f1f257..ea530a62 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -17622,7 +17622,7 @@ MessagesManager::MessageNotificationGroup MessagesManager::get_message_notificat
       LOG(ERROR) << "Total notification count is negative in " << d->dialog_id;
       result.total_count = 0;
     }
-    result.notifications = get_message_notifications_from_database(
+    result.notifications = get_message_notifications_from_database_force(
         d, NotificationId::max(), static_cast<int32>(td_->notification_manager_->get_max_notification_group_size()));
 
     int32 last_notification_date = 0;
@@ -17638,6 +17638,8 @@ MessagesManager::MessageNotificationGroup MessagesManager::get_message_notificat
       set_dialog_last_notification(d, last_notification_date, last_notification_id,
                                    "get_message_notification_group_force");
     }
+
+    std::reverse(result.notifications.begin(), result.notifications.end());
   }
 
   return result;
@@ -17649,30 +17651,43 @@ bool MessagesManager::is_message_has_active_notification(const Dialog *d, const
          (m->message_id.get() > d->last_read_inbox_message_id.get() || m->contains_unread_mention);
 }
 
-vector<Notification> MessagesManager::get_message_notifications_from_database(Dialog *d,
-                                                                              NotificationId from_notification_id,
-                                                                              int32 limit) {
+vector<Notification> MessagesManager::get_message_notifications_from_database_force(Dialog *d,
+                                                                                    NotificationId from_notification_id,
+                                                                                    int32 limit) {
   CHECK(d != nullptr);
   if (!G()->parameters().use_message_db) {
     return {};
   }
 
-  auto result = G()->td_db()->get_messages_db_sync()->get_messages_from_notification_id(d->dialog_id,
-                                                                                        from_notification_id, limit);
-  if (result.is_error()) {
-    return {};
-  }
-  auto messages = result.move_as_ok();
+  while (true) {
+    auto result = G()->td_db()->get_messages_db_sync()->get_messages_from_notification_id(d->dialog_id,
+                                                                                          from_notification_id, limit);
+    if (result.is_error()) {
+      return {};
+    }
+    auto messages = result.move_as_ok();
+    if (messages.empty()) {
+      return {};
+    }
 
-  vector<Notification> res;
-  res.reserve(messages.size());
-  for (auto &message : messages) {
-    auto m = on_get_message_from_database(d->dialog_id, d, std::move(message));
-    if (is_message_has_active_notification(d, m)) {
-      res.emplace_back(m->notification_id, m->date, create_new_message_notification(m->message_id));
+    vector<Notification> res;
+    res.reserve(messages.size());
+    bool is_found = false;
+    for (auto &message : messages) {
+      auto m = on_get_message_from_database(d->dialog_id, d, std::move(message));
+      if (is_message_has_active_notification(d, m)) {
+        res.emplace_back(m->notification_id, m->date, create_new_message_notification(m->message_id));
+      }
+      if (m != nullptr && m->notification_id.is_valid()) {
+        CHECK(m->notification_id.get() < from_notification_id.get());
+        from_notification_id = m->notification_id;
+        is_found = true;
+      }
+    }
+    if (!res.empty() || !is_found) {
+      return res;
     }
   }
-  return res;
 }
 
 vector<NotificationGroupKey> MessagesManager::get_message_notification_group_keys_from_database(
@@ -17681,7 +17696,7 @@ vector<NotificationGroupKey> MessagesManager::get_message_notification_group_key
     return {};
   }
 
-  VLOG(notifications) << "Load " << limit << " message notification groups from database from date "
+  VLOG(notifications) << "Trying to load " << limit << " message notification groups from database from date "
                       << from_last_notification_date << " and " << from_dialog_id;
 
   Result<std::vector<BufferSlice>> r_dialogs =
@@ -17703,11 +17718,82 @@ vector<NotificationGroupKey> MessagesManager::get_message_notification_group_key
     CHECK(d->message_notification_group_id.is_valid());
     group_keys.emplace_back(d->message_notification_group_id, d->dialog_id, d->last_notification_date);
 
-    VLOG(notifications) << "Load " << group_keys.back() << " from database";
+    VLOG(notifications) << "Loaded " << group_keys.back() << " from database";
   }
   return group_keys;
 }
 
+void MessagesManager::get_message_notifications_from_database(DialogId dialog_id, NotificationId from_notification_id,
+                                                              int32 limit, Promise<vector<Notification>> promise) {
+  if (!G()->parameters().use_message_db) {
+    return promise.set_error(Status::Error(500, "There is no message database"));
+  }
+
+  CHECK(dialog_id.is_valid());
+  CHECK(limit > 0);
+
+  auto d = get_dialog_force(dialog_id);
+  if (d == nullptr) {
+    LOG(ERROR) << "Can't find " << dialog_id;
+    return promise.set_error(Status::Error(500, "Can't find chat"));
+  }
+  if (!d->message_notification_group_id.is_valid()) {
+    return promise.set_value(vector<Notification>());
+  }
+
+  VLOG(notifications) << "Trying to load " << limit << " notifications in " << dialog_id << " from "
+                      << from_notification_id;
+  G()->td_db()->get_messages_db_async()->get_messages_from_notification_id(
+      dialog_id, from_notification_id, limit,
+      PromiseCreator::lambda([actor_id = actor_id(this), dialog_id, limit,
+                              promise = std::move(promise)](Result<vector<BufferSlice>> result) mutable {
+        send_closure(actor_id, &MessagesManager::on_get_message_notifications_from_database, dialog_id, limit,
+                     std::move(result), std::move(promise));
+      }));
+}
+
+void MessagesManager::on_get_message_notifications_from_database(DialogId dialog_id, int32 limit,
+                                                                 Result<vector<BufferSlice>> result,
+                                                                 Promise<vector<Notification>> promise) {
+  if (result.is_error()) {
+    return promise.set_error(result.move_as_error());
+  }
+
+  Dialog *d = get_dialog_force(dialog_id);
+  CHECK(d != nullptr);
+  CHECK(d->message_notification_group_id.is_valid());
+
+  auto messages = result.move_as_ok();
+  vector<Notification> res;
+  res.reserve(messages.size());
+  NotificationId from_notification_id;
+  for (auto &message : messages) {
+    auto m = on_get_message_from_database(dialog_id, d, std::move(message));
+    if (is_message_has_active_notification(d, m)) {
+      res.emplace_back(m->notification_id, m->date, create_new_message_notification(m->message_id));
+    }
+    if (m != nullptr && m->notification_id.is_valid()) {
+      CHECK(!from_notification_id.is_valid() || m->notification_id.get() < from_notification_id.get());
+      from_notification_id = m->notification_id;
+    }
+  }
+  if (!res.empty() || !from_notification_id.is_valid() || static_cast<size_t>(limit) > messages.size()) {
+    std::reverse(res.begin(), res.end());
+    return promise.set_value(std::move(res));
+  }
+
+  // try again from adjusted from_notification_id
+  VLOG(notifications) << "Trying to load " << limit << " notifications in " << dialog_id << " from "
+                      << from_notification_id;
+  G()->td_db()->get_messages_db_async()->get_messages_from_notification_id(
+      dialog_id, from_notification_id, limit,
+      PromiseCreator::lambda([actor_id = actor_id(this), dialog_id, limit,
+                              promise = std::move(promise)](Result<vector<BufferSlice>> result) mutable {
+        send_closure(actor_id, &MessagesManager::on_get_message_notifications_from_database, dialog_id, limit,
+                     std::move(result), std::move(promise));
+      }));
+}
+
 void MessagesManager::remove_message_notification(DialogId dialog_id, NotificationId notification_id) {
   Dialog *d = get_dialog_force(dialog_id);
   if (d == nullptr) {
@@ -17736,11 +17822,10 @@ void MessagesManager::remove_message_notification(DialogId dialog_id, Notificati
   if (G()->parameters().use_message_db) {
     G()->td_db()->get_messages_db_async()->get_messages_from_notification_id(
         dialog_id, NotificationId(notification_id.get() + 1), 1,
-        PromiseCreator::lambda(
-            [dialog_id, notification_id, actor_id = actor_id(this)](vector<BufferSlice> result) mutable {
-              send_closure(actor_id, &MessagesManager::do_remove_message_notification, dialog_id, notification_id,
-                           std::move(result));
-            }));
+        PromiseCreator::lambda([dialog_id, notification_id, actor_id = actor_id(this)](vector<BufferSlice> result) {
+          send_closure(actor_id, &MessagesManager::do_remove_message_notification, dialog_id, notification_id,
+                       std::move(result));
+        }));
   }
 }
 
@@ -17867,7 +17952,7 @@ bool MessagesManager::add_new_message_notification(Dialog *d, Message *m, bool f
                                   << ", but forced to send notification about " << m->message_id << " in "
                                   << d->dialog_id;
   // notification group must be preloaded to guarantee that there is no race between
-  // get_message_notifications_from_database and new notifications added right now
+  // get_message_notifications_from_database_force and new notifications added right now
   td_->notification_manager_->load_group_force(get_dialog_message_notification_group_id(d));
   do {
     m->notification_id = td_->notification_manager_->get_next_notification_id();
@@ -20190,7 +20275,7 @@ MessagesManager::Message *MessagesManager::get_message_force(Dialog *d, MessageI
     return nullptr;
   }
 
-  LOG(INFO) << "Try to load " << FullMessageId{d->dialog_id, message_id} << " from database";
+  LOG(INFO) << "Trying to load " << FullMessageId{d->dialog_id, message_id} << " from database";
   auto r_value = G()->td_db()->get_messages_db_sync()->get_message({d->dialog_id, message_id});
   if (r_value.is_error()) {
     return nullptr;
diff --git a/td/telegram/MessagesManager.h b/td/telegram/MessagesManager.h
index 28cd5701..8aaa7257 100644
--- a/td/telegram/MessagesManager.h
+++ b/td/telegram/MessagesManager.h
@@ -668,6 +668,9 @@ class MessagesManager : public Actor {
   vector<NotificationGroupKey> get_message_notification_group_keys_from_database(int32 from_last_notification_date,
                                                                                  DialogId from_dialog_id, int32 limit);
 
+  void get_message_notifications_from_database(DialogId dialog_id, NotificationId from_notification_id, int32 limit,
+                                               Promise<vector<Notification>> promise);
+
   void remove_message_notification(DialogId dialog_id, NotificationId notification_id);
 
   void remove_message_notifications(DialogId dialog_id, NotificationId max_notification_id);
@@ -1491,8 +1494,11 @@ class MessagesManager : public Actor {
 
   NotificationGroupId get_dialog_message_notification_group_id(Dialog *d);
 
-  vector<Notification> get_message_notifications_from_database(Dialog *d, NotificationId from_notification_id,
-                                                               int32 limit);
+  vector<Notification> get_message_notifications_from_database_force(Dialog *d, NotificationId from_notification_id,
+                                                                     int32 limit);
+
+  void on_get_message_notifications_from_database(DialogId dialog_id, int32 limit, Result<vector<BufferSlice>> result,
+                                                  Promise<vector<Notification>> promise);
 
   void do_remove_message_notification(DialogId dialog_id, NotificationId notification_id, vector<BufferSlice> result);
 
diff --git a/td/telegram/NotificationManager.cpp b/td/telegram/NotificationManager.cpp
index 6a699e5c..0fe9c394 100644
--- a/td/telegram/NotificationManager.cpp
+++ b/td/telegram/NotificationManager.cpp
@@ -193,8 +193,6 @@ NotificationManager::NotificationGroups::iterator NotificationManager::get_group
     }
   }
 
-  std::reverse(message_group.notifications.begin(), message_group.notifications.end());
-
   NotificationGroup group;
   group.total_count = message_group.total_count;
   group.notifications = std::move(message_group.notifications);
@@ -244,9 +242,178 @@ int32 NotificationManager::load_message_notification_groups_from_database(int32
   return result;
 }
 
+NotificationId NotificationManager::get_first_notification_id(const NotificationGroup &group) {
+  if (!group.notifications.empty()) {
+    return group.notifications[0].notification_id;
+  }
+  if (!group.pending_notifications.empty()) {
+    return group.pending_notifications[0].notification_id;
+  }
+  return NotificationId();
+}
+
 void NotificationManager::load_message_notifications_from_database(const NotificationGroupKey &group_key,
-                                                                   const NotificationGroup &group) {
-  // TODO
+                                                                   NotificationGroup &group, size_t desired_size) {
+  if (!G()->parameters().use_message_db) {
+    return;
+  }
+  if (group.is_loaded_from_database || group.is_being_loaded_from_database) {
+    return;
+  }
+
+  VLOG(notifications) << "Trying to load up to " << desired_size << " notifications in " << group_key.group_id
+                      << " with " << group.notifications.size() << " current notifications";
+
+  group.is_being_loaded_from_database = true;
+
+  CHECK(desired_size > group.notifications.size());
+  size_t limit = desired_size - group.notifications.size();
+  auto first_notification_id = get_first_notification_id(group);
+  auto from_notification_id = first_notification_id.is_valid() ? first_notification_id : NotificationId::max();
+  send_closure(G()->messages_manager(), &MessagesManager::get_message_notifications_from_database, group_key.dialog_id,
+               from_notification_id, static_cast<int32>(limit),
+               PromiseCreator::lambda([actor_id = actor_id(this), group_id = group_key.group_id,
+                                       limit](Result<vector<Notification>> r_notifications) {
+                 send_closure_later(actor_id, &NotificationManager::on_get_message_notifications_from_database,
+                                    group_id, limit, std::move(r_notifications));
+               }));
+}
+
+void NotificationManager::on_get_message_notifications_from_database(NotificationGroupId group_id, size_t limit,
+                                                                     Result<vector<Notification>> r_notifications) {
+  auto group_it = get_group(group_id);
+  CHECK(group_it != groups_.end());
+  auto &group = group_it->second;
+  CHECK(group.is_being_loaded_from_database == true);
+  group.is_being_loaded_from_database = false;
+
+  if (r_notifications.is_error()) {
+    group.is_loaded_from_database = true;  // do not try again to load it
+    return;
+  }
+  auto notifications = r_notifications.move_as_ok();
+
+  CHECK(limit > 0);
+  if (notifications.empty()) {
+    group.is_loaded_from_database = true;
+  }
+
+  auto first_notification_id = get_first_notification_id(group);
+  if (first_notification_id.is_valid()) {
+    while (!notifications.empty() && notifications.back().notification_id.get() >= first_notification_id.get()) {
+      // possible if notifications was added after the database request was sent
+      notifications.pop_back();
+    }
+  }
+
+  add_notifications_to_group_begin(std::move(group_it), std::move(notifications));
+
+  group_it = get_group(group_id);
+  CHECK(group_it != groups_.end());
+  if (max_notification_group_size_ > group_it->second.notifications.size()) {
+    load_message_notifications_from_database(group_it->first, group_it->second, keep_notification_group_size_);
+  }
+}
+
+void NotificationManager::add_notifications_to_group_begin(NotificationGroups::iterator group_it,
+                                                           vector<Notification> notifications) {
+  CHECK(group_it != groups_.end());
+
+  if (notifications.empty()) {
+    return;
+  }
+  VLOG(notifications) << "Add to beginning of " << group_it->first << " of size "
+                      << group_it->second.notifications.size() << ' ' << notifications;
+
+  auto group_key = group_it->first;
+  auto final_group_key = group_key;
+  for (auto &notification : notifications) {
+    if (notification.date > final_group_key.last_notification_date) {
+      final_group_key.last_notification_date = notification.date;
+    }
+  }
+  CHECK(final_group_key.last_notification_date != 0);
+
+  bool is_position_changed = final_group_key.last_notification_date != group_key.last_notification_date;
+
+  NotificationGroup group = std::move(group_it->second);
+  if (is_position_changed) {
+    VLOG(notifications) << "Position of notification group is changed from " << group_key << " to " << final_group_key;
+    delete_group(std::move(group_it));
+  }
+
+  auto last_group_key = get_last_updated_group_key();
+  bool was_updated = false;
+  bool is_updated = false;
+  if (is_position_changed) {
+    was_updated = group_key.last_notification_date != 0 && group_key < last_group_key;
+    is_updated = final_group_key.last_notification_date != 0 && final_group_key < last_group_key;
+  } else {
+    was_updated = is_updated = !(last_group_key < group_key);
+  }
+
+  if (!is_updated) {
+    CHECK(!was_updated);
+    VLOG(notifications) << "There is no need to send updateNotificationGroup in " << group_key
+                        << ", because of newer notification groups";
+    group.notifications.insert(group.notifications.begin(), std::make_move_iterator(notifications.begin()),
+                               std::make_move_iterator(notifications.end()));
+  } else {
+    if (!was_updated) {
+      if (last_group_key.last_notification_date != 0) {
+        // need to remove last notification group to not exceed max_notification_group_count_
+        send_remove_group_update(last_group_key, groups_[last_group_key], vector<int32>());
+      }
+      send_add_group_update(group_key, group);
+    }
+
+    vector<Notification> new_notifications;
+    vector<td_api::object_ptr<td_api::notification>> added_notifications;
+    new_notifications.reserve(notifications.size());
+    added_notifications.reserve(notifications.size());
+    for (auto &notification : notifications) {
+      added_notifications.push_back(get_notification_object(group_key.dialog_id, notification));
+      if (added_notifications.back()->type_ == nullptr) {
+        added_notifications.pop_back();
+      } else {
+        new_notifications.push_back(std::move(notification));
+      }
+    }
+    notifications = std::move(new_notifications);
+
+    size_t old_notification_count = group.notifications.size();
+    auto updated_notification_count = old_notification_count < max_notification_group_size_
+                                          ? max_notification_group_size_ - old_notification_count
+                                          : 0;
+    if (added_notifications.size() > updated_notification_count) {
+      added_notifications.erase(added_notifications.begin(), added_notifications.end() - updated_notification_count);
+    }
+    auto new_notification_count = old_notification_count < keep_notification_group_size_
+                                      ? keep_notification_group_size_ - old_notification_count
+                                      : 0;
+    if (new_notification_count > notifications.size()) {
+      new_notification_count = notifications.size();
+    }
+    if (new_notification_count != 0) {
+      VLOG(notifications) << "Add " << new_notification_count << " notifications to " << group_key.group_id
+                          << " with current size " << group.notifications.size();
+      group.notifications.insert(group.notifications.begin(),
+                                 std::make_move_iterator(notifications.end() - new_notification_count),
+                                 std::make_move_iterator(notifications.end()));
+    }
+
+    if (!added_notifications.empty()) {
+      add_update_notification_group(td_api::make_object<td_api::updateNotificationGroup>(
+          group_key.group_id.get(), group_key.dialog_id.get(), 0, true, group.total_count,
+          std::move(added_notifications), vector<int32>()));
+    }
+  }
+
+  if (is_position_changed) {
+    add_group(std::move(final_group_key), std::move(group));
+  } else {
+    group_it->second = std::move(group);
+  }
 }
 
 size_t NotificationManager::get_max_notification_group_size() const {
@@ -795,9 +962,7 @@ void NotificationManager::do_flush_pending_notifications(NotificationGroupKey &g
   }
   group.total_count += narrow_cast<int32>(added_notifications.size());
   if (added_notifications.size() > max_notification_group_size_) {
-    added_notifications.erase(
-        added_notifications.begin(),
-        added_notifications.begin() + (added_notifications.size() - max_notification_group_size_));
+    added_notifications.erase(added_notifications.begin(), added_notifications.end() - max_notification_group_size_);
   }
 
   vector<int32> removed_notification_ids;
@@ -893,6 +1058,7 @@ void NotificationManager::flush_pending_notifications(NotificationGroupId group_
     CHECK(!was_updated);
     VLOG(notifications) << "There is no need to send updateNotificationGroup in " << group_key
                         << ", because of newer notification groups";
+    group.total_count += narrow_cast<int32>(group.pending_notifications.size());
     for (auto &pending_notification : group.pending_notifications) {
       group.notifications.emplace_back(pending_notification.notification_id, pending_notification.date,
                                        std::move(pending_notification.type));
@@ -900,7 +1066,7 @@ void NotificationManager::flush_pending_notifications(NotificationGroupId group_
   } else {
     if (!was_updated) {
       if (last_group_key.last_notification_date != 0) {
-        // need to remove last notification group to not exceed max_notification_group_size_
+        // need to remove last notification group to not exceed max_notification_group_count_
         send_remove_group_update(last_group_key, groups_[last_group_key], vector<int32>());
       }
       send_add_group_update(group_key, group);
@@ -925,13 +1091,10 @@ void NotificationManager::flush_pending_notifications(NotificationGroupId group_
 
   group.pending_notifications_flush_time = 0;
   group.pending_notifications.clear();
-  if (group.notifications.size() >
-      keep_notification_group_size_ +
-          EXTRA_GROUP_SIZE) {  // ensure that we delete a lot of notifications simultaneously
+  // if we can delete a lot of notifications simultaneously
+  if (group.notifications.size() > keep_notification_group_size_ + EXTRA_GROUP_SIZE) {
     // keep only keep_notification_group_size_ last notifications in memory
-    group.notifications.erase(
-        group.notifications.begin(),
-        group.notifications.begin() + (group.notifications.size() - keep_notification_group_size_));
+    group.notifications.erase(group.notifications.begin(), group.notifications.end() - keep_notification_group_size_);
   }
 
   add_group(std::move(final_group_key), std::move(group));
@@ -1144,6 +1307,13 @@ void NotificationManager::remove_notification(NotificationGroupId group_id, Noti
     }
   }
 
+  if (is_permanent) {
+    group_it->second.total_count--;
+  }
+  if (is_found) {
+    group_it->second.notifications.erase(group_it->second.notifications.begin() + notification_pos);
+  }
+
   vector<td_api::object_ptr<td_api::notification>> added_notifications;
   vector<int32> removed_notification_ids;
   if (is_found && notification_pos + max_notification_group_size_ >= old_group_size) {
@@ -1156,17 +1326,10 @@ void NotificationManager::remove_notification(NotificationGroupId group_id, Noti
         added_notifications.pop_back();
       }
     } else {
-      load_message_notifications_from_database(group_it->first, group_it->second);
+      load_message_notifications_from_database(group_it->first, group_it->second, keep_notification_group_size_);
     }
   }
 
-  if (is_permanent) {
-    group_it->second.total_count--;
-  }
-  if (is_found) {
-    group_it->second.notifications.erase(group_it->second.notifications.begin() + notification_pos);
-  }
-
   if (is_permanent || !removed_notification_ids.empty()) {
     on_notifications_removed(std::move(group_it), std::move(added_notifications), std::move(removed_notification_ids));
   }
@@ -1353,6 +1516,10 @@ void NotificationManager::on_notification_group_size_max_changed() {
     return;
   }
 
+  auto new_keep_notification_group_size =
+      new_max_notification_group_size_size_t +
+      clamp(new_max_notification_group_size_size_t, EXTRA_GROUP_SIZE / 2, EXTRA_GROUP_SIZE);
+
   VLOG(notifications) << "Change max notification group size from " << max_notification_group_size_ << " to "
                       << new_max_notification_group_size;
 
@@ -1381,6 +1548,9 @@ void NotificationManager::on_notification_group_size_max_changed() {
         }
         CHECK(!removed_notification_ids.empty());
       } else {
+        if (new_max_notification_group_size_size_t > notification_count) {
+          load_message_notifications_from_database(group_key, group, new_keep_notification_group_size);
+        }
         if (notification_count <= max_notification_group_size_) {
           VLOG(notifications) << "There is no need to update " << group_key.group_id;
           continue;
@@ -1392,10 +1562,6 @@ void NotificationManager::on_notification_group_size_max_changed() {
             added_notifications.pop_back();
           }
         }
-        if (new_max_notification_group_size_size_t > notification_count &&
-            static_cast<size_t>(group.total_count) > notification_count && G()->parameters().use_message_db) {
-          load_message_notifications_from_database(group_key, group);
-        }
         if (added_notifications.empty()) {
           continue;
         }
@@ -1409,8 +1575,7 @@ void NotificationManager::on_notification_group_size_max_changed() {
   }
 
   max_notification_group_size_ = new_max_notification_group_size_size_t;
-  keep_notification_group_size_ =
-      max_notification_group_size_ + clamp(max_notification_group_size_, EXTRA_GROUP_SIZE / 2, EXTRA_GROUP_SIZE);
+  keep_notification_group_size_ = new_keep_notification_group_size;
 }
 
 void NotificationManager::on_online_cloud_timeout_changed() {
diff --git a/td/telegram/NotificationManager.h b/td/telegram/NotificationManager.h
index 2bddc954..75c501ff 100644
--- a/td/telegram/NotificationManager.h
+++ b/td/telegram/NotificationManager.h
@@ -106,6 +106,8 @@ class NotificationManager : public Actor {
 
   struct NotificationGroup {
     int32 total_count = 0;
+    bool is_loaded_from_database = false;
+    bool is_being_loaded_from_database = false;
 
     vector<Notification> notifications;
 
@@ -139,9 +141,17 @@ class NotificationManager : public Actor {
 
   void delete_group(NotificationGroups::iterator &&group_it);
 
+  static NotificationId get_first_notification_id(const NotificationGroup &group);
+
   int32 load_message_notification_groups_from_database(int32 limit, bool send_update);
 
-  void load_message_notifications_from_database(const NotificationGroupKey &group_key, const NotificationGroup &group);
+  void load_message_notifications_from_database(const NotificationGroupKey &group_key, NotificationGroup &group,
+                                                size_t desired_size);
+
+  void on_get_message_notifications_from_database(NotificationGroupId group_id, size_t limit,
+                                                  Result<vector<Notification>> r_notifications);
+
+  void add_notifications_to_group_begin(NotificationGroups::iterator group_it, vector<Notification> notifications);
 
   NotificationGroupKey get_last_updated_group_key() const;