### 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
)
@app.route("%s/functions/<function>/aliases/<name>" % API_PATH_ROOT, methods=["DELETE"])
def delete_alias(function, name):
    region = LambdaRegion.get()
    arn = func_arn(function)
    if arn not in region.lambdas:
        return not_found_error(arn)
    lambda_details = region.lambdas.get(arn)
    if name not in lambda_details.aliases:
        return not_found_error(msg="Alias not found: %s:%s" % (arn, name))
    lambda_details.aliases.pop(name)
    return jsonify({})
@app.route("/<version>/functions/<function>/concurrency", methods=["GET", "PUT", "DELETE"])
def function_concurrency(version, function):
    region = LambdaRegion.get()
    
    
    
    arn = func_arn(function)
    lambda_details = region.lambdas.get(arn)
    if not lambda_details:
        return not_found_error(arn)
    if request.method == "GET":
        data = lambda_details.concurrency
    if request.method == "PUT":
        data = json.loads(request.data)
        lambda_details.concurrency = data
    if request.method == "DELETE":
        lambda_details.concurrency = None
        return Response("", status=204)