# Phase 3E.4 - Minimal User-Facing Schedule Override

## Status
Implemented

## Overview
Phase 3E.4 introduces the minimal, direct-scheduler workflow for single-date schedule exceptions (overrides) on top of recurring schedules. This bypasses the full proposal system and is intended for users with the `schedules.manage` permission.

## Files Modified
* `frontend/src/components/schedule-manager/schedule-manager-API/ScheduleManagerAPI.js`
  - Added `createException` endpoint method.
  - Added `revertException` endpoint method.
* `frontend/src/components/schedule-manager/schedule-manager-components/components/QuickSchedulePopover.jsx`
  - Added `Change This Date` flow for normal recurring FINAL cells.
  - Added `Change Override` flow for existing override cells.
  - Added `Revert to Regular Schedule` flow for existing override cells.
  - Added `onExceptionChange` prop for dashboard reload.
* `frontend/src/components/schedule-manager/schedule-manager-components/LayouSMDashboard.jsx`
  - Bound `onExceptionChange` to `loadRange` to reload the schedule view.

## Workflow

1. **Create Exception**: 
   - Direct schedulers click a normal FINAL recurring schedule cell.
   - Click **Change This Date**.
   - Select a replacement shift and enter a reason.
   - The cell becomes an `[Override]`.
2. **Change Exception**:
   - Direct schedulers click an existing `[Override]` cell.
   - Click **Change Override** to update the replacement shift or reason.
3. **Revert Exception**:
   - Click **Revert to Regular Schedule**.
   - The override is deactivated (`is_active = 0`) and the underlying recurring schedule resumes control of that date.

## Known Limitations
* Exceptions cannot be scheduled on past dates (Historical Protection).
* Exceptions do not interact with Leaves (if an employee is on leave, the leave overlays the exception).
* Conflict detection is strictly enforced during create, update, and revert.

## Next Steps
The backend and frontend are wired up. Proceed with manual verification of the UI states and API bindings.