### 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
mapping = {}
    function_name = data["FunctionName"]
    enabled = data.get("Enabled", True)
    batch_size = data.get("BatchSize")
    mapping["UUID"] = str(uuid.uuid4())
    mapping["FunctionArn"] = func_arn(function_name)
    mapping["LastProcessingResult"] = "OK"
    mapping["StateTransitionReason"] = "User action"
    mapping["LastModified"] = format_timestamp_for_event_source_mapping()
    mapping["State"] = "Enabled" if enabled in [True, None] else "Disabled"
    mapping["ParallelizationFactor"] = data.get("ParallelizationFactor") or 1
    mapping["Topics"] = data.get("Topics") or []
    mapping["MaximumRetryAttempts"] = data.get("MaximumRetryAttempts") or -1
    if "SelfManagedEventSource" in data:
        source_arn = data["SourceAccessConfigurations"][0]["URI"]
        mapping["SelfManagedEventSource"] = data["SelfManagedEventSource"]
        mapping["SourceAccessConfigurations"] = data["SourceAccessConfigurations"]
    else:
        source_arn = data["EventSourceArn"]
        mapping["EventSourceArn"] = source_arn
        mapping["StartingPosition"] = data.get("StartingPosition") or "LATEST"
    batch_size = check_batch_size_range(source_arn, batch_size)
    mapping["BatchSize"] = batch_size
    if data.get("DestinationConfig"):
        mapping["DestinationConfig"] = data.get("DestinationConfig")
    if data.get("FunctionResponseTypes"):
        mapping["FunctionResponseTypes"] = data.get("FunctionResponseTypes")
    return mapping
def format_timestamp(timestamp=None):