# Phase 3E.5 - Bug Fixes & Global Security Update

## Status
Implemented

## Overview
Phase 3E.5 finalizes the Schedule Exceptions (Override / Revert) workflow by addressing critical backend routing failures and improving the application's global API security. The update ensures that unhandled database or server errors are masked from the frontend to prevent leaking backend structure, and it resolves payload serialization issues in the React frontend.

## Files Modified
* `.agents/AGENTS.md`
  - Created global agent guidelines ensuring no technical stack traces or SQL errors are ever leaked in API responses.
* `backend/server/admin_request.php`
  - Injected `api_output_guard.php` to globally intercept and sanitize all unhandled errors across all authenticated API endpoints.
* `backend/schedule-manager/exceptions/create.php` & `revert.php`
  - Replaced undefined `sanitize_input()` with `get_sanitized_input()`.
  - Removed duplicate inclusion of output guards.
  - Safely scrubbed API output while retaining business logic validation messages.
* `frontend/src/components/schedule-manager/schedule-manager-API/ScheduleManagerAPI.js`
  - Removed duplicate `revertException` function definition which was causing Javascript to map object payloads into a single parameter and drop the rest.
* `frontend/src/components/schedule-manager/schedule-manager-components/LayouSMDashboard.jsx`
  - Filtered `pending_submissions` array to ignore `applied`, `rejected`, or `withdrawn` requests to prevent false-positive notifications on the Schedule Grid.

## Workflow & Resolutions

1. **Global Output Masking**: 
   - When a fatal PHP error or MySQL syntax failure occurs on the backend, the `api_output_guard` buffers the output, logs the true error securely to `c:\xampp\apache\logs\error.log`, and forcefully returns `{"success": false, "message": "The operation could not be completed."}` to the frontend.
2. **Exception Payload Fix**: 
   - The React frontend popup now properly binds the `schedule_id` and `exception_date` keys when executing the `revertException` API call. The backend receives pristine JSON objects.
3. **Robust Input Reading**:
   - Both override creation and reversion now safely read raw JSON inputs via the `get_sanitized_input()` middleware rather than directly parsing `php://input` which was fragile against XSS injections.

## Next Steps
The feature is now stable, secure, and ready for production testing. No immediate architectural changes are required for exceptions.