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Engineering Notes • Neruba Engineering Notes

#2 — Idempotency that survives retries

Design ingestion + charge creation so you never double-bill.

Why it matters

Retries are normal: client timeouts, queue re-delivery, webhook replays. If your system isn’t idempotent at each boundary, you will double-charge.

Practical pattern

  • Require an idempotency_key on create-like endpoints.
  • Persist (tenant_id, key) → resulting object id.
  • On retry, return the original result (not a new one).
  • Make charge creation idempotent too (charge_key per customer + period).

Neruba scopes idempotency keys by tenant/project to prevent cross-tenant collisions.

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Usage pricing, credits, and subscriptions

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