### 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
{
                "EventSource": "aws:sns",
                "EventVersion": "1.0",
                "EventSubscriptionArn": subscription_arn,
                "Sns": {
                    "Type": "Notification",
                    "MessageId": message_id,
                    "TopicArn": topic_arn,
                    "Subject": subject,
                    "Message": message,
                    "Timestamp": timestamp_millis(),
                    "SignatureVersion": "1",
                    
                    
                    "Signature": "EXAMPLEpH+..",
                    "SigningCertUrl": "https://sns.us-east-1.amazonaws.com/SimpleNotificationService-0000000000000000000000.pem",
                    "UnsubscribeUrl": unsubscribe_url,
                    "MessageAttributes": message_attributes,
                },
            }
        ]
    }
    inv_result = run_lambda(
        func_arn=func_arn,
        event=event,
        context={},
        asynchronous=not config.SYNCHRONOUS_SNS_EVENTS,
    )
    return inv_result.result
def get_event_sources(func_name=None, source_arn=None):