code: def create_schema(alembic_config_ini=None):
      
      Base.metadata.create_all()
      if alembic_config_ini:
          from alembic.config import Config
          from alembic import command
          alembic_cfg = Config(alembic_config_ini)
          command.stamp(alembic_cfg, 'head')
docs: Create the database schema.
  
      :param alembic_config_ini: When provided, stamp with the current revision
      version.