/// <summary>
        /// 既存の接続に参加
        /// </summary>
        /// <param name="id">RowKey</param>
        /// <param name="account">UserAccount</param>
        /// <returns>接続したChatAccount</returns>
        public async Task <ChatAccount> OpenBridge(Guid id, ChannelAccount account)
        {
            var ownerAccount = await FindAccount(id);

            if (ownerAccount == null)
            {
                return(null);
            }

            var self = await FindBridges(ownerAccount.UserId, account.Id);

            if (self != null)
            {
                return(self);
            }

            var newId      = Guid.NewGuid();
            var newAccount = new ChatAccount()
            {
                PartitionKey = ownerAccount.UserId,
                RowKey       = newId.ToString(),
                OwnerId      = ownerAccount.UserId,
                UserId       = account.Id,
                Address      = account.Address,
                Name         = account.Name,
                ChannelId    = account.ChannelId,
                Created      = DateTime.UtcNow,
                Modified     = DateTime.UtcNow,
            };
            await m_Table.ExecuteAsync(TableOperation.Insert(newAccount));

            return(newAccount);
        }
        /// <summary>
        /// 接続の開始
        /// </summary>
        /// <param name="account">UserAccount</param>
        /// <returns>接続したChatAccount</returns>
        public async Task <ChatAccount> CreateBridge(ChannelAccount account)
        {
            var find = await FindBridge(account.Id);

            if (find != null)
            {
                return(find);
            }

            var id         = Guid.NewGuid();
            var newAccount = new ChatAccount()
            {
                PartitionKey = account.Id,
                RowKey       = id.ToString(),
                OwnerId      = account.Id,
                UserId       = account.Id,
                Address      = account.Address,
                Name         = account.Name,
                ChannelId    = account.ChannelId,
                Created      = DateTime.UtcNow,
                Modified     = DateTime.UtcNow,
            };
            await m_Table.ExecuteAsync(TableOperation.Insert(newAccount));

            return(newAccount);
        }