### 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
def get_url_config(function):
    arn = func_arn(function)
    qualifier = request.args.get("Qualifier")
    q_arn = func_qualifier(function, qualifier)
    arn = q_arn or arn
    lambda_backend = LambdaRegion.get()
    url_config = lambda_backend.url_configs.get(arn)
    if url_config is None:
        response = error_response(
            "The resource you requested does not exist.", 404, "ResourceNotFoundException"
        )
        return correct_error_response_for_url_config(response)
    response = url_config.copy()
    response.pop("CustomId")
    return response
@app.route("%s/functions/<function>/url" % API_PATH_ROOT_2, methods=["PUT"])
def update_url_config(function):
    arn = func_arn(function)
    qualifier = request.args.get("Qualifier")
    q_arn = func_qualifier(function, qualifier)
    arn = q_arn or arn
    lambda_backend = LambdaRegion.get()
    prev_url_config = lambda_backend.url_configs.get(arn)
    if prev_url_config is None:
        return not_found_error()
    data = json.loads(to_str(request.data))
    new_url_config = {
        "AuthType": data.get("AuthType"),
        "LastModifiedTime": timestamp(format=TIMESTAMP_FORMAT_MICROS),
    }