public async Task <IEnumerable <GuestbookEntry> > GetGuestbookEntries()
        {
            using (var db = _sqlConnectionFactory.Open())
            {
                const string sql = @"SELECT Name, Message, CreatedAt as Date
                                    FROM GuestbookEntry
                                    ORDER BY CreatedAt ASC;";

                return(await db.QueryAsync <GuestbookEntry>(sql));
            }
        }