public async Task AddTrackedHashtag(TrackedHashtag item)
 {
     try
     {
         await _context.TrackedHashtag.InsertOneAsync(item);
     }
     catch (Exception ex)
     {
         // log or manage the exception
         throw ex;
     }
 }
        public async Task <UpdateResult> UpdateTrackedHashtag(TrackedHashtag item, string ht)
        {
            var filter = Builders <TrackedHashtag> .Filter.Eq(s => s.HashTag, item.HashTag);

            var update = Builders <TrackedHashtag> .Update
                         .Set(s => s.HashTag, ht);

            try
            {
                return(await _context.TrackedHashtag.UpdateOneAsync(filter, update));
            }
            catch (Exception ex)
            {
                // log or manage the exception
                throw ex;
            }
        }