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Add idempotency module: Idempotency-Key for POST APIs on Spring Boot 4.1.2 with Redis and Postgres stores

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One servlet filter, two interchangeable stores, 18 tests (9 scenarios x 2 stores) against a real
redis-server 7.0.15 and PostgreSQL 16.15, and 20 captured transcripts under output/: replay, 422 on a
changed body, concurrent duplicates, expiry, the crash window and a handler slower than the lock.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b5yg8grY17JsVAJviV
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asmhatre
2026-11-08 18:22:05 +00:00
co-authored by Claude Sonnet 5.5
parent 8da3374155
commit 6a36e84858
44 changed files with 1459 additions and 0 deletions
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idempotency/output/08-slow-handler-redis.txt
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store: redis, in-progress ttl: 2 s, handler takes 3.2 s
request A (t=0 s) -> HTTP 201 replayed=- retry-after=- {"id":1,"customer":"cus_42","amount":1999,"currency":"INR"}
request B (t=2.5 s, same key) -> HTTP 201 replayed=- retry-after=- {"id":2,"customer":"cus_42","amount":1999,"currency":"INR"}
payments in the table: 2
requests that finished after their lock expired: 2
what the store holds afterwards: nothing (EXISTS idem:k-8 = 0)