Multi-Source Event Processor

def process_sqs_event(event: dict) -> list[dict]:
    """
    Process SQS event and extract message details.

    Args:
        event: Raw SQS event dictionary

    Returns:
        List of dictionaries containing:
        - body: Message body as string
        - receipt_handle: Receipt handle for the message
        - attributes: Message attributes dictionary
    """
    pass

def process_s3_event(event: dict) -> list[dict]:
    """
    Process S3 event and extract object details.

    Args:
        event: Raw S3 event dictionary

    Returns:
        List of dictionaries containing:
        - bucket: Bucket name
        - key: Object key (URL-decoded)
        - event_name: Event name (e.g., 'ObjectCreated:Put')
    """
    pass

def process_dynamodb_event(event: dict) -> list[dict]:
    """
    Process DynamoDB stream event and extract record details.

    Args:
        event: Raw DynamoDB stream event dictionary

    Returns:
        List of dictionaries containing:
        - event_name: Event name (INSERT, MODIFY, REMOVE)
        - new_image: New image as native Python dict (None for REMOVE)
        - old_image: Old image as native Python dict (None for INSERT)
    """
    pass

def process_apigateway_event(event: dict) -> dict:
    """
    Process API Gateway REST event and extract request details.

    Args:
        event: Raw API Gateway REST event dictionary

    Returns:
        Dictionary containing:
        - method: HTTP method
        - path: Request path
        - query_params: Query string parameters as dict
        - user_agent: User-Agent header value (case-insensitive lookup)
    """
    pass