docs: def connect(self, dsn):
          """Connect to DB.
  
          dbname: the database name user: user name used to authenticate password:
          password used to authenticate host: database host address (defaults to UNIX
          socket if not provided) port: connection port number (defaults to 5432 if not
          provided)
  
          """
          self.con = psycopg2.connect(dsn)
          self.cur = self.con.cursor(cursor_factory=psycopg2.extras.DictCursor)
          # autocommit: Disable automatic transactions
          self.con.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)