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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/00-timezone-trap.txt
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$ psql -c "SHOW server_version"
16.15 (Ubuntu 16.15-0ubuntu0.24.04.1)
$ psql -c "SET timezone='Asia/Calcutta'"
ERROR: invalid value for parameter "TimeZone": "Asia/Calcutta"
$ psql -c "SET timezone='Asia/Kolkata'"
SET
$ ls /usr/share/zoneinfo/Asia | grep -E 'Calcutta|Kolkata'
Kolkata
$ dpkg -l tzdata | tail -1
tzdata 2026e-0ubuntu0.24.04.1