[wbarnha]

Summary

• Add runnable exactly-once and manual at-most-once Kafka crash-window examples.
• Add an exactly-once SQLite side-effect example using atomic idempotency-key writes; SQLite is not part of Kafka's distributed transaction.
• Include a shared harness and local Kafka-compatible Compose setup.

Validation

• Exactly-once Kafka: 100/100 unique read-committed outputs after forced worker restart.
• Manual at-most-once: 99/100 outputs, no duplicates; first record was acknowledged before its side effect.
• SQLite idempotent effect: 100/100 unique stored IDs after replay.
• Python compile and diagnostics pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (3442a90) to head (d5eafe0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #797   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         110      110           
  Lines       11791    11791           
  Branches     1282     1282           
=======================================
  Hits        11343    11343           
  Misses        351      351           
  Partials       97       97           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.