# Iteration Log - 2026-07-23 14:30 (Ad-hoc Session Security Timeout)

## Request
- Refactor the session security timeout logic to implement a hybrid 1-hour inactivity and Page Visibility session timeout.
- Ensure user activity (clicks, mouse movement, keys, touch) resets the timer only when the tab is visible.
- Ensure the warning modal ("Session Security Alert") is only shown when remaining time is 2 minutes or less.
- Prevent immediate warning or logout when user switches tabs (let it count down silently in the background, resetting if they return before expiry).
- Perform under TDD workflow with zero compiler/syntax errors.

## Steps Taken
1. **Created Custom Hook (`src/hooks/useInactivityTimeout.ts`):**
   - Implemented logic with event listeners (`mousemove`, `mousedown`, `click`, `scroll`, `keydown`, `touchstart`).
   - Tracked activity timestamp using `useRef` to prevent unnecessary re-renders.
   - Listened to `visibilitychange` to block activity resets when hidden and check timeout state immediately on tab return.
   - Defined default 1-hour (`3600s`) timeout and 2-minute (`120s`) warning parameters.
   - Handled session renewal via `/api/auth/renew` and session logout via `/api/auth/logout`.
2. **Created Unit Tests (`test/test-inactivity.js`):**
   - Wrote a Node-based testing harness mocking state setters, time progression, visibility states, and assertions.
   - Verified that user activity updates time only when visible.
   - Verified warning and auto-logout thresholds.
   - Verified silent background countdown during tab switching.
   - Verified immediate expiration check upon tab return.
3. **Executed Tests:**
   - Ran `node test/test-inactivity.js`. Fixed parameter signature and successfully verified that all 8 assertions passed.
4. **Refactored `DashboardLayout.tsx`:**
   - Integrated the new `useInactivityTimeout` custom hook.
   - Cleaned up manual timers, interval cleanup, and states, shortening the component to 116 lines (well below the 256-line threshold).
5. **Compilation Check:**
   - Ran `npm run build` compilation checks. Confirmed Next.js successfully compiles without any TypeScript or logical errors.
6. **Documentation Update:**
   - Updated `docs/feature-list.md` to document the Tab-Aware 1-hour session security timeout.

## Outcome
- All unit tests passed successfully.
- Code successfully builds and compiles.
- Tab-Aware 1-hour Session Security Timeout implemented safely.

## Considerations for Next Time
- The default session token (`JWT`) generated by the backend lasts 24 hours. The frontend inactivity timeout of 1 hour handles inactivity-based security correctly. No backend configuration changes are required.