Hi there, anyone has experience scheduling lambda invocations with second precision? As far as I know, dynamo ttl is always a couple minutes late and the Cron construct (which uses EventBridge) is minute precision. I need something that invokes a lambda with second or sub-second precision. Any ideas?

I use AWS StepFunction, put a Wait state before a Task

People have done this with funny stepfunctions that sleep every second

There are many blogs with various techniques. You should be able to find them by Googling. Don't count on DynamoDB TTL for accuracy under four hours - it's usually faster but that's the guarantee level. A good technique that is easier/cheaper than step function is a scheduled EventBridge once a minute that then shoves the events for the next minute or fifteen into an SQS queue with delay to obtain per-second resolution.