### 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
"""List functions
    ---
    operationId: 'listFunctions'
    parameters:
        - name: 'request'
          in: body
    """
    funcs = do_list_functions()
    result = {"Functions": funcs}
    return jsonify(result)
@app.route("%s/functions/<function>" % API_PATH_ROOT, methods=["DELETE"])
def delete_function(function):
    """Delete an existing function
    ---
    operationId: 'deleteFunction'
    parameters:
        - name: 'request'
          in: body
    """
    result = delete_lambda_function(function)
    return jsonify(result)
@app.route("%s/functions/<function>/code" % API_PATH_ROOT, methods=["PUT"])