Add a new item to a Dynamodb using a AWS lambda function each time a function is executed with Cloudwatch

Question

I'm trying to modify a Dynamodb table each time a Lambda function is executed. Specifically, I create a simple lambda function that returns a list of S3 bucket names and this function run each minute thanks to a Cloudwatch's rule. However, as I said before, my goal is to also update a Dynamodb each time the same function is executed. Specifically I want to add each time a new Item with the same attribute (so let's say the function is executed 1000 times, I want 1K items/rows).

However I don't know how to do it. Any suggestions? Here's the code:

Answer 1

The problem here is that the PutItem command does overwrite exiting items if they are the same. So every time you try to insert Update= Done it overwrites the same item. So you need to put something unique in your item so that a new item is created and the old one is not overwritten. You could use either UUID or the time of execution.

from datetime import datetime

[...]

table.put_item(
    Item = {
        "Update": response,
        "ProcessingTime": datetime.now().isoformat()
    }
)