### 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 check_logs():
            expected = [
                r'.*"Records":.*',
                r'.*"dynamodb": {(.*)}.*',
                r'.*"eventSource": ("aws:dynamodb").*',
                r'.*"eventName": ("INSERT").*',
                r'.*"Keys": {0}.*'.format(json.dumps(db_item)),
            ]
            check_lambda_logs(function_name, expected_lines=expected)
        function_name = f"lambda_func-{short_uid()}"
        role = f"test-lambda-role-{short_uid()}"
        policy_name = f"test-lambda-policy-{short_uid()}"
        table_name = f"test-table-{short_uid()}"
        partition_key = "my_partition_key"
        db_item = {partition_key: {"S": "hello world"}}
        try:
            role_arn = create_iam_role_with_policy(
                RoleName=role,
                PolicyName=policy_name,
                RoleDefinition=lambda_role,
                PolicyDefinition=s3_lambda_permission,
            )
            create_lambda_function(
                handler_file=TEST_LAMBDA_PYTHON_ECHO,
                func_name=function_name,
                runtime=LAMBDA_RUNTIME_PYTHON37,
                role=role_arn,
            )
            dynamodb_create_table(table_name=table_name, partition_key=partition_key)