private async Task NotifyForNewChannelMessageAsync(int channelId, int messageId, int workspaceId, List <int> mentionUserIds = null)
{
var userIds = (await _channelQueryService.GetAllChannelUserIdsAsync(channelId)).ToList();
await _cacheService.AddUnreadChannelMessageForUsersAsync(channelId, messageId, userIds, workspaceId, mentionUserIds);
await SendChannelMessageItemChangedNotificationAsync(channelId, messageId, MessageChangeType.Added);
}