docs: def get_compound_ids(self):
          """Extract the current compound ids in the database. Updates the self.compound_ids list
          """
          cursor = self.conn.cursor()
          cursor.execute('SELECT inchikey_id FROM metab_compound')
          self.conn.commit()
          for row in cursor:
              if not row[0] in self.compound_ids:
                  self.compound_ids.append(row[0])