public async Task <bool> RequestOne(string accountId, int count)
        {
            var profileId = _httpContextAccessor.GetUserIdentifier();
            var profile   = _profilesService.GetSingleByParameter(
                e => e.ProfileId == profileId && e.AccountId == accountId
                );
            // TODO: filter transactions

            await Clients.Caller.SendAsync("ResponseOne", profile?.ToProfileDto());

            var pipeline   = profileId.ToMongoPipelineMatchSingle <ProfileEntity>(accountId);
            var enumerator = _profilesService.SubscribeToChangesMany(pipeline);

            while (enumerator.MoveNext())
            {
                if (enumerator.Current != null)
                {
                    await Clients.Caller.SendAsync(
                        "ResponseOne",
                        enumerator.Current.FullDocument.ToProfileDto()
                        );
                }
            }
            return(true);
        }