**Tx OS** — a bilingual (Arabic/English, RTL/LTR) full-stack internal web platform styled as an OS-like interface with glassmorphism aesthetics. Built as a pnpm monorepo.
- **OS Home Screen**: live clock status bar (per-user clock style: full / digital / digital-no-seconds / analog / minimal, picker in status bar), app grid, bottom dock
- **Admin Panel**: CRUD for apps, services, users (admin role required). Delete dialogs show a dependency warning on the FIRST click using count fields (`groupCount`/`restrictionCount`/`openCount` on apps, `orderCount` on services, `noteCount`/`orderCount`/`conversationCount`/`messageCount` on users) returned by the list endpoints (`GET /api/admin/apps`, `GET /api/services`, `GET /api/users`); the lazy 409 conflict response from `DELETE /api/{apps,services,users}/:id` (with `?force=true` to override) remains as a safety net. The Add App dialog includes a `NewAppPermissionsPicker` that lets admins pre-set `permissionIds[]` so `POST /api/apps` creates the app and inserts its `app_permissions` rows in the same transaction (with `onConflictDoNothing`), avoiding the brief unrestricted window between create and follow-up gating.
- **Executive Meetings (Phase 2)**: bilingual full-stack module under `/executive-meetings` with 9 sections — Schedule (centered cells, attendees widest column, RTL-locked column order # / الاجتماع / الحضور / الوقت), Manage Meetings (CRUD with attendee replace, transactional), Change Requests (submit / withdraw, supports `meetingId=null` for create-suggestions), Approvals (approve/reject with review notes), Tasks (CRUD with assignee status updates — assignees and mutators can change status, only mutators can delete), Notifications (per-user feed; meeting/request/task events fan out via `recordExecutiveMeetingNotifications` to both `executive_meeting_notifications` and the global `notifications` bell, then broadcast via Socket.IO `notification_created` per-user + `executive_meeting_notifications_changed` globally; approvers also receive a best-effort email side-channel via `sendExecutiveMeetingEmail` that logs an outbox entry until SMTP is wired up), Audit Log (full action chain, admin role required), PDF (window.print export), Font Settings (per-user + global scope, family/size/weight/alignment with live preview). RBAC enforced via 5 role sets (READ/MUTATE/APPROVE/REQUEST/ADMIN_AUDIT) and a `makeRequireRoles` middleware factory; `/api/executive-meetings/me` returns `{userId, roles, canRead, canMutate, canApprove, canSubmitRequest, canViewAudit}`. Every mutation (meeting/request/task/font CRUD) wraps the DB write **and** the audit-log insert in the same `db.transaction(...)` so audit entries cannot drift from state. Routes use `router.param("id")` with `next("route")` to handle path-to-regexp 8 (no inline `:id(\\d+)` support).
- i18n locale files: `artifacts/tx-os/src/locales/ar.json` and `en.json`
- Default receivers group is named **Tx** (renamed from legacy "TeaBoy"); a one-time migration in the seed script renames any pre-existing legacy group on next run.
- **Rich-text columns are PostgreSQL `text` (no length cap).** `executive_meetings.title_ar`, `executive_meetings.title_en`, and `executive_meeting_attendees.name` were widened from `varchar(500)` / `varchar(255)` to `text` to hold sanitized Tiptap HTML. The schema declarations live in `lib/db/src/schema/executive-meetings.ts`.
- **`pnpm --filter @workspace/db run push-force` must run in every environment** (dev, staging, production) after deploying schema changes. Dev is covered automatically by `scripts/post-merge.sh`. Staging and production must run the same command on each deploy so their `title_ar` / `title_en` / `name` columns match the code; otherwise long rich-text saves will be rejected by the old varchar limits.
- **Pre-push cleanup is automatic.** Both `pnpm --filter @workspace/db run push` and `push-force` now run `lib/db/scripts/pre-push-cleanup.ts` first. That script is idempotent and:
1. Collapses duplicate rows in `app_permissions` to one per `(app_id, permission_id)` so the composite primary key declared by the schema can be created on legacy DBs.
2. Deletes orphan `executive_meeting_notifications` rows whose `meeting_id` no longer exists, so the new `ON DELETE CASCADE` foreign key the schema declares can be added on legacy DBs.
Both checks are skipped automatically on a fresh DB (the table-existence guard makes them no-ops). No manual SQL is needed in any environment — `pnpm --filter @workspace/db run push` runs cleanly against both fresh and existing dev DBs, and `scripts/post-merge.sh` continues to use `push-force` so the same cleanup runs after every task merge. All schema tables (notably `role_permission_audit` and `permission_audit`) are created via the normal push path.
`executive_meeting_attendees.kind` (`varchar(16) NOT NULL DEFAULT 'person'`) lets meetings interleave free-text section headers ("subheadings") with person rows. Subheadings are excluded from the running attendee number and from the per-meeting attendee count surface, but reorder/delete identically to person rows. The schema lives in `lib/db/src/schema/executive-meetings.ts`. All four insert paths (POST, PATCH attendees replace, PUT attendees, duplicate) round-trip `kind`. The PDF renderer (`artifacts/api-server/src/lib/pdf-renderer.ts`) prints subheadings as `— label —` and skips them when incrementing `personIdx`.
**Deployment / migration step (run once per environment before the next release):** the new `kind` column has `NOT NULL DEFAULT 'person'`, so existing rows are auto-backfilled by Postgres on add-column. Apply via either `pnpm --filter @workspace/db run push-force` (recommended; idempotent) or, if push is blocked by other legacy data in that environment, run this one-line SQL: `ALTER TABLE executive_meeting_attendees ADD COLUMN IF NOT EXISTS kind varchar(16) NOT NULL DEFAULT 'person';`. Verify backfill with `SELECT kind, COUNT(*) FROM executive_meeting_attendees GROUP BY kind;` — every existing row should report `kind = 'person'`.
