Fix N+1 Trigger Patterns Where Lambda Functions Hammer the Same DynamoDB Partition Key (opens in new tab)

You add a sixth Lambda trigger to your OrderEvents table, deploy it, and within 20 minutes your SLA dashboard goes red. Latency on order writes jumps from 4ms to 40ms. The function itself is fine. The table is fine. The problem is that five other Lambdas are already hitting the same partition key on every write, and you just made it six. DynamoDB's internal partition throttling doesn't care that each function looks clean in isolation. This is an N+1 trigger problem, and your AI coding assista...