---
task_id: "5"
task_hash: "sha256:3d4c3ad3efc8a298211c74dd6c8da2d95fe4a8c1269fc58f0672ccc5f148e3c6"
next: "Task 6: history list/detail/delete"
completed: "Calculation save, policy version and idempotency"
evidence: "W3 suite 6/6 passed"
review: ".superpowers/sdd/reviews/T5.md"
risk: "Concurrent same-key race needs MySQL validation"
commit_start: "4b42a624d7ec2bb5cac64bc13cd7d4d8eba91ee7"
commit_end: "27dbc095e0413f9566bcc4ddc3bdb4f642535a6b"
created_at: "2026-09-20T08:34:50.804Z"
plan_hash: "sha256:77341d6e000ef1624d59d66b8b361c24e7ef8f1b5d065dd4d648a2a7537e72d5"
plan_revision: 1
---

# Checkpoint: 5

## Next
Task 6: history list/detail/delete

## Completed
Calculation save, policy version and idempotency

## Evidence
W3 suite 6/6 passed

## Review
.superpowers/sdd/reviews/T5.md

## Risk
Concurrent same-key race needs MySQL validation

## Commit Start
4b42a624d7ec2bb5cac64bc13cd7d4d8eba91ee7

## Commit End
27dbc095e0413f9566bcc4ddc3bdb4f642535a6b