docs: def all(self):
          """ Returns list with all indexed datasets. """
          datasets = []
  
          query = text("""
              SELECT vid
              FROM dataset_index;""")
  
          for result in self.backend.library.database.connection.execute(query):
              res = DatasetSearchResult()
              res.vid = result[0]
              res.b_score = 1
              datasets.append(res)
          return datasets