### 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
stream_names = []
    def _create_stream(**kwargs):
        if "StreamName" not in kwargs:
            kwargs["StreamName"] = f"test-stream-{short_uid()}"
        kinesis_client.create_stream(**kwargs)
        stream_names.append(kwargs["StreamName"])
        return kwargs["StreamName"]
    yield _create_stream
    for stream_name in stream_names:
        try:
            kinesis_client.delete_stream(StreamName=stream_name, EnforceConsumerDeletion=True)
        except Exception as e:
            LOG.debug("error cleaning up kinesis stream %s: %s", stream_name, e)
@pytest.fixture
def wait_for_stream_ready(kinesis_client):
    def _wait_for_stream_ready(stream_name: str):
        def is_stream_ready():
            describe_stream_response = kinesis_client.describe_stream(StreamName=stream_name)
            return describe_stream_response["StreamDescription"]["StreamStatus"] in [
                "ACTIVE",
                "UPDATING",
            ]
        poll_condition(is_stream_ready)
    return _wait_for_stream_ready
@pytest.fixture
def wait_for_delivery_stream_ready(firehose_client):
    def _wait_for_stream_ready(delivery_stream_name: str):
        def is_stream_ready():