<ul><li><strong>AUDIT — ReservationsManager (module_id=32):</strong> Performed complete analysis of all module files, controller methods, model methods, DB schema, AJAX endpoints, approval workflow, recurring logic, and role-based access control.</li><li><strong>CONFIRMED EXISTING — allow_double_booking field:</strong> Column <code>allow_double_booking TINYINT(1) NOT NULL DEFAULT 0</code> already exists on <code>domain_tbl_reservation_category</code>. No DB migration needed.</li><li><strong>CONFIRMED EXISTING — Controller enforcement:</strong> Both <code>addReservation()</code> (one-time path) and <code>iterate_save_notify()</code> (recurring path) already read <code>allow_double_booking</code> from the facility and bypass conflict check when it is 1.</li><li><strong>CONFIRMED EXISTING — Availability grid:</strong> <code>getFacilitiesController.php</code> already reads <code>allow_double_booking</code> per facility from pre-cached <code></code> and uses it to determine whether a booked slot renders as AVAILABLE or blocked.</li><li><strong>CONFIRMED EXISTING — UI fields:</strong> Add and Edit Facility modals in <code>reservation_modals.php</code> both include the Allow Double Booking checkbox. JS population on edit is present in <code>custom_js.php</code>.</li><li><strong>CONFIRMED EXISTING — Model method:</strong> <code>ReservationModel::checkTimeConflict()</code> exists with strict overlap logic (start &lt; end AND end &gt; start), excludes Declined reservations, supports exclude_id for update scenarios.</li><li><strong>DOCS — Created comprehensive module documentation:</strong> <code>Documentation/modules/reservations_module/README.md</code> covering all DB tables with column descriptions, tenant admin capabilities, user capabilities, all AJAX endpoints, approval workflow, recurring logic, RBAC, double booking control details, full file structure, and known limitations.</li></ul>