# HAC-31 Safe Mutation Guardrails

Date: 2026-03-31
Owner: Senior Frontend Engineer
Issue: HAC-31

## Goal

Harden current-phase writable operations without expanding product scope beyond existing string save and TTL controls.

## Scope

- add a scoped review step before string save
- add a scoped review step before TTL set and TTL removal
- block no-op mutation submits before they reach the desktop bridge or demo fallback
- preserve draft value and TTL input when a live mutation fails

## Explicit Non-Goals

- Add Key flow changes
- real delete execution
- non-string editing
- command-surface changes
- visual refresh beyond mutation clarity

## Implementation

- Added `apps/desktop/src/lib/mutation-guardrails.ts` for mutation summaries and no-op detection helpers.
- Updated `apps/desktop/src/App.tsx` so save and TTL actions open a shared review dialog with scoped current-vs-next details.
- Disabled string save when no value change is pending.
- Disabled TTL set when the requested TTL already matches the active TTL state.
- Kept live failure handling on the shared operator notice layer while preserving draft state for retry.

## Verification

- `pnpm --filter @redis-gui/desktop test`
- `pnpm run desktop:build`