Panduan Kejuruteraan: Freelance Programmer: LangGraph Stateful Agents & Human-in-the-Loop Checkpoints. Aldian Fazrihady ialah Programmer Bebas Kanan & Jurutera AI (Python, Django, FastAPI, React, Next.js, TypeScript, Golang).
Build auditable, resumable multi-agent state graphs with PostgreSQL checkpointing by hiring senior freelance programmer Aldian Fazrihady.
from typing import TypedDict, Annotated
import operator
class AgentWorkflowState(TypedDict):
messages: Annotated[list[str], operator.add]
pending_refund_cents: int
manager_approved: bool