## Data Integrity

### \[GENERAL\] API communication
* All fetch requests include error handling
* Failed responses throw descriptive errors
* Token validation before protected operations
* Automatic localStorage cleanup on logout

### \[GENERAL\] data persistence
* Employee data cached in localStorage after login
* Token automatically retrieved from localStorage
* Data structure normalization for scheduled shifts

### \[GENERAL\] error handling
* Network errors are caught and logged
* HTTP errors include status codes and messages
* Failed authentication triggers cleanup and logout

## Role & Permission Notes
* The frontend services don't explicitly restrict actions by role
* Role-based restrictions are likely handled by the backend
* Frontend assumes user has permissions for requested operations
* 401 responses indicate insufficient permissions at backend level