SAAS INFRASTRUCTURE MIGRATION

1# Idempotent Lambda handler — safe to retry on failure
2import boto3
3from aws_lambda_powertools import Logger, Tracer
4from aws_lambda_powertools.utilities.idempotency import (
5    DynamoDBPersistenceLayer,
6    idempotent,
7)
8
9logger = Logger()
10tracer = Tracer()
11persistence = DynamoDBPersistenceLayer(table_name="idempotency-store")
12
13@idempotent(persistence_store=persistence)
14@tracer.capture_lambda_handler
15@logger.inject_lambda_context
16def handler(event: dict, context) -> dict:
17    invoice_id = event["invoice_id"]
18    logger.info("Processing invoice", invoice_id=invoice_id)
19
20    result = process_invoice(invoice_id)
21
22    return {"statusCode": 200, "body": result}