docstr: Set up the connection required by the handler.
  Returns:
      DBHandlerStatus
docstr_tok: ["Set","up","the","connection","required","by","the","handler",".","Returns",":","DBHandlerStatus"]
code: def connect(self) -> DBHandlerStatus:
      """
      Set up the connection required by the handler.
      Returns:
          DBHandlerStatus
      """
      try:
          self.connection = psycopg2.connect(
              host=self.host,
              port=self.port,
              user=self.user,
              password=self.password,
              database=self.database,
          )
          self.connection.autocommit = True
          return DBHandlerStatus(status=True)
      except psycopg2.Error as e:
          return DBHandlerStatus(status=False, error=str(e))
  
file_path: evadb/evadb/third_party/databases/postgres/postgres_handler.py
imports: import numpy
  import pandas
  import psycopg2
  from evadb.third_party.databases.types import DBHandler, DBHandlerResponse, DBHandlerStatus
label_desc: Use image node_id 2 for calling the PostgresHandler obj's underlying member method code with example usage: obj.connect() and returns: DBHandlerStatus, DBHandlerStatus