What is idempotency?

In practice

In practice it means giving each operation a key derived from the event rather than from the moment it ran, recording which keys have been processed, and checking before acting. It is a small amount of work at design time and an expensive retrofit once duplicates are already in the data.

Where it fits in a build

Anywhere retries exist — which is everywhere that involves a network. Payments, order creation, email sending, CRM writes and document generation all deserve it.

Common mistakes

• Relying on the sender never retrying, which is not a guarantee anyone gives.
• Using a timestamp as the key, which changes on every retry and defeats the purpose.
• Deduplicating in memory, which forgets everything when the process restarts.

Related terms

• Webhook
• System integration
• Observability

Working on something that involves this?

ASTACKRA designs and builds AI systems, automation and custom software for businesses that need technology shaped around their own workflow. If this term turned up in a proposal and you want a straight answer about whether it applies to your situation, ask us — no obligation, and we will tell you if the answer is no.