### 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
data = json.loads(to_str(request.data))
    url_config = {
        "AuthType": data.get("AuthType"),
        "FunctionArn": arn,
        "FunctionUrl": url,
        "CreationTime": timestamp(format=TIMESTAMP_FORMAT_MICROS),
        "LastModifiedTime": timestamp(format=TIMESTAMP_FORMAT_MICROS),
        "CustomId": custom_id,
    }
    if "Cors" in data:
        cors = data.get("Cors", {})
        url_config.update(
            {
                "Cors": {
                    "AllowCredentials": cors.get("AllowCredentials", ["*"]),
                    "AllowHeaders": cors.get("AllowHeaders", ["*"]),
                    "AllowMethods": cors.get("AllowMethods", ["*"]),
                    "AllowOrigins": cors.get("AllowOrigins", ["*"]),
                    "ExposeHeaders": cors.get("ExposeHeaders", []),
                    "MaxAge": cors.get("MaxAge", 0),
                }
            }
        )
    lambda_backend.url_configs.update({arn: url_config})
    response = url_config.copy()
    response.pop("LastModifiedTime")
    response.pop("CustomId")
    return response, 201
@app.route("%s/functions/<function>/url" % API_PATH_ROOT_2, methods=["GET"])