def __init__(self):
        """Initialize PostgreSQL connection using environment variables."""

        try:
            import psycopg2
            from psycopg2.extras import RealDictCursor

        except ImportError:
            raise ImportError("Please install psycopg2 library to use PostgreSQL.")

        self.db_type = DBType.POSTGRES
        self.conn = psycopg2.connect(
            dbname=os.getenv("POSTGRES_DB", "postgres"),
            user=os.getenv("POSTGRES_USER", "postgres"),
            password=os.getenv("POSTGRES_PASSWORD", "postgres"),
            host=os.getenv("POSTGRES_HOST", "localhost"),
            port=os.getenv("POSTGRES_PORT", "5432"),
        )
        self.cursor = self.conn.cursor(cursor_factory=RealDictCursor)
Initialize PostgreSQL connection using environment variables.
backend/director/db/postgres/db.py