Idempotency keys for contract write endpoints#937
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can you update fork and comit again |
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#closes
#842
Description
This PR implements an Idempotency Layer in the backend API to satisfy the critical goal of preventing accidental duplicate on-chain writes (such as duplicate content submissions, voting, or double-minting rewards via Soroban smart contracts) caused by client network retries or page refreshes.
By introducing an Idempotency-Key header verification lifecycle, the API guarantees that a unique business operation is executed exactly once, safely caching and replaying successful responses on subsequent retries, and throwing standard errors during rapid concurrent race conditions.
Implementation Details
Added an IdempotencyKey tracking table to the PostgreSQL schema via Prisma.
Key Strategy: The key serves as a unique primary string index.
Status tracking: Set to STARTED when a transaction begins and updated to COMPLETED upon a successful API outcome.
Storage & Expiry Policy: Records have a strict 24-hour Time-to-Live (TTL) enforced via automated application level cleanup routines and check validations to minimize database bloat while safely covering client retry windows.