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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/scripts/run-all.sh
Executable
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#!/usr/bin/env bash
# Regenerates every file under output/.
#
# ./scripts/run-all.sh
#
# Needs JDK 25, Maven 3.9, redis-server and redis-cli (7.x) on the PATH, and a PostgreSQL 14+ that
# the application can reach (IDEM_DB_URL / IDEM_DB_USER / IDEM_DB_PASSWORD, default
# jdbc:postgresql://localhost:5432/idem as idem/idem). The tests start a throwaway redis-server on a
# free port; they do truncate the payments and idempotency_keys tables in that database.
# Transcripts 01-08 come out of the test suite, so each line in them is an assertion that fails the
# build when it stops being true. Transcript 00 is psql, run by scripts/timezone-trap.sh.
set -euo pipefail
cd "$(dirname "$0")/.."
mkdir -p output
echo "== time zone trap (transcript 00)"
./scripts/timezone-trap.sh >/dev/null || true
echo "== test suite (transcripts 01-08, two stores)"
mvn -B test | tee /tmp/idempotency-mvn.log | grep -E '^\[(INFO|WARNING|ERROR)\] Tests run:' | sed 's/^\[[A-Z]*\] //' > output/09-test-summary.txt
echo
echo "output:"
ls -1 output