docs: def command_create_tables(self, meta_name=None, verbose=False):
          '''
          Create tables according sqlalchemy data model.
  
          Is not a complex migration tool like alembic, just creates tables that
          does not exist::
  
              ./manage.py sqla:create_tables [--verbose] [meta_name]
          '''
  
          def _create_metadata_tables(metadata):
              for table in metadata.sorted_tables:
                  if verbose:
                      print(self._schema(table))
                  else:
                      print('  '+table.name)
                  engine = self.session.get_bind(clause=table)
                  metadata.create_all(bind=engine, tables=[table])
  
          if isinstance(self.metadata, MetaData):
              print('Creating tables...')
              _create_metadata_tables(self.metadata)
          else:
              for current_meta_name, metadata in self.metadata.items():
                  if meta_name not in (current_meta_name, None):
                      continue
                  print('Creating tables for {}...'.format(current_meta_name))
                  _create_metadata_tables(metadata)