### 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
continue
        for key, value in dict(attr).items():
            attr[first_char_to_lower(key)] = attr.pop(key)
    return message_attrs
def process_apigateway_invocation(
    func_arn,
    path,
    payload,
    stage,
    api_id,
    headers=None,
    is_base64_encoded=False,
    resource_path=None,
    method=None,
    path_params=None,
    query_string_params=None,
    stage_variables=None,
    request_context=None,
):
    if path_params is None:
        path_params = {}
    if request_context is None:
        request_context = {}
    try:
        resource_path = resource_path or path
        event = construct_invocation_event(
            method, path, headers, payload, query_string_params, is_base64_encoded
        )
        path_params = dict(path_params)
        fix_proxy_path_params(path_params)