docs: def set_primary_keys_auto(self, tables=None):
          """
          Create primary keys for every table in the connected database.
  
          Checks that each table has a primary key.  If a table does not have a key
          then each column is analyzed to determine if it contains only unique values.
          If no columns exist containing only unique values then a new 'ID' column
          is created to serve as a auto_incrementing primary key.
          """
          # Retrieve list of tables if not provided
          tables = tables if tables else self.tables
  
          # Resolve primary keys and return list of table, primary_key tuples
          return [(table, self.set_primary_key_auto(table)) for table in tables]