REVIEW-READY CHANGE CHECKLIST — optional local worksheet
Full FastAPI course 1.0.0

[ ] State the problem and concrete before/after behavior.
[ ] Include the smallest relevant code change and source revision.
[ ] Record the Python version and dependency-lock checksum.
[ ] Show the defect with a failing test or deliberate negative control.
[ ] Include passing focused tests, nearby denied cases and full relevant suite.
[ ] Describe request/response/error contracts and compatibility.
[ ] Verify commit/rollback, capacity contention and idempotent retries if affected.
[ ] Apply role and ownership scope on the server, before pagination.
[ ] Inspect schema migration SQL; preserve existing data and record revision.
[ ] For backfills, verify resumption and remaining missing-value count.
[ ] Bound provider attempts, total wait and task admission/shutdown.
[ ] Keep passwords, keys, bearer tokens and private payloads out of evidence.
[ ] Verify liveness, readiness and bounded/redacted operational signals.
[ ] Record local build/startup and a data-preserving rollback approach.
[ ] Explain known limitations and the next safe improvement.

For check-in: denied customers leave status/event count unchanged; an allowed
operator changes status and creates one event atomically; a retry with the
same key creates no duplicate; a different key after success is a conflict.

Keep the code, test report, API contract and reflection in one local bundle.
This checklist is not a pass-score rubric, certificate review or approval.