docs: def schema_list(dbname, user=None,
                  db_user=None, db_password=None,
                  db_host=None, db_port=None):
      '''
      Return a dict with information about schemas in a Postgres database.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' postgres.schema_list dbname
  
      dbname
          Database name we query on
  
      user
          The system user the operation should be performed on behalf of
  
      db_user
          database username if different from config or default
  
      db_password
          user password if any password for a specified user
  
      db_host
          Database host if different from config or default
  
      db_port
          Database port if different from config or default
      '''
  
      ret = {}
  
      query = (''.join([
          'SELECT '
          'pg_namespace.nspname as "name",'
          'pg_namespace.nspacl as "acl", '
          'pg_roles.rolname as "owner" '
          'FROM pg_namespace '
          'LEFT JOIN pg_roles ON pg_roles.oid = pg_namespace.nspowner '
      ]))
  
      rows = psql_query(query, runas=user,
                        host=db_host,
                        user=db_user,
                        port=db_port,
                        maintenance_db=dbname,
                        password=db_password)
  
      for row in rows:
          retrow = {}
          for key in ('owner', 'acl'):
              retrow[key] = row[key]
          ret[row['name']] = retrow
  
      return ret