feat: Reduce minimum audit log deletion period to 6 days and update enrollment last access only for active enrollments.

Backend/src/controllers/AuditController.ts

@@ -169,8 +169,8 @@ export class AuditController {
             throw new ValidationError('No token provided');
         }
 
-        if (days < 30) {
-            throw new ValidationError('Cannot delete logs newer than 30 days');
+        if (days < 6) {
+            throw new ValidationError('Cannot delete logs newer than 6 days');
         }
 
         const deleted = await auditService.deleteOldLogs(days);