### 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 parsed_headers is not None:
        response.headers.update(parsed_headers)
    try:
        result_body = parsed_result.get("body")
        if isinstance(result_body, dict):
            response.set_data(json.dumps(result_body))
        else:
            body_bytes = to_bytes(to_str(result_body or ""))
            if parsed_result.get("isBase64Encoded", False):
                body_bytes = base64.b64decode(body_bytes)
            response.set_data(body_bytes)
    except Exception as e:
        LOG.warning("Couldn't set Lambda response content: %s", e)
        response._content = "{}"
    return response
@app.before_request
def before_request():
    
    transfer_encoding = request.headers.get("Transfer-Encoding", "").lower()
    if transfer_encoding == "chunked":
        request.environ["wsgi.input_terminated"] = True
@app.route("%s/functions" % API_PATH_ROOT, methods=["POST"])
def create_function():
    """Create new function
    ---
    operationId: 'createFunction'
    parameters:
        - name: 'request'
          in: body
    """