code: def to_db(self, table, dtypes=None):
          
          if self._check_db() is False:
              return
          if table not in self.db.tables:
              self.db.create_table(table)
              self.info("Created table ", table)
          self.start("Saving data to database table " + table + " ...")
          recs = self.to_records_()
          self.insert(table, recs, dtypes)
          self.end("Data inserted in table", table)
docs: Save the main dataframe to the database