### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Basically we want to only run the lambda when an insert is occurring in DynamoDB.
I tested using Dynobase deleting a record and the lambda still triggered.

```
resource "aws_lambda_event_source_mapping" "event-log" {
	event_source_arn  = aws_dynamodb_table.event-log.stream_arn
	function_name     = module.main.lambda-arn
	starting_position = "LATEST"
	enabled = true # change to false when truncating the table in localstack
	maximum_retry_attempts = 1 # limit retry on failure to 1 for now

	# https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
	filter_criteria { # Doesn't seem to work on LocalStack for now
		filter {
			pattern = jsonencode({
				body = {
					eventName : ["INSERT"]
				}
			})
		}
	}
}
```


### 🧑‍💻 Implementation

_No response_

### Anything else?

 https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
}
            if md5OfMessageAttributes := msg.get("MD5OfMessageAttributes"):
                record["md5OfMessageAttributes"] = md5OfMessageAttributes
            records.append(record)
        event = {"Records": records}
        res = run_lambda(
            func_arn=lambda_arn,
            event=event,
            context={},
            asynchronous=True,
            callback=delete_messages,
        )
        if isinstance(res, InvocationResult):
            status_code = getattr(res.result, "status_code", 0)
            if status_code >= 400:
                return False
        return True
def parse_batch_item_failures(result: InvocationResult, valid_message_ids: List[str]) -> List[str]:
    """
    Parses a lambda responses as a partial batch failure response, that looks something like this::
        {
          "batchItemFailures": [
                {
                    "itemIdentifier": "id2"
                },
                {
                    "itemIdentifier": "id4"
                }
            ]
        }