radiantwave/docs/schedule-api-contract.md

# Schedule API & Data Contract

Status: Phase 0 (contract only — no application code). This document is the
authoritative API/data contract for the multi-phase scheduler overhaul. It is
kept **byte-identical** in both repositories:

- `radiantwave` (C++/SDL3 Kiosk app) — `docs/schedule-api-contract.md`
- `portal` (SvelteKit/Node) — `docs/schedule-api-contract.md`

Any change is applied to both copies in the same step, with a dated line
appended to the [Changelog](#changelog).

Glossary terms (Kiosk, Portal, Proclamation, Category, Group, Block, Schedule,
License Key, System Name) are used with the meanings defined in the scheduler
overhaul brief.

---

## Current state

This section reflects the code as it exists at the start of Phase 0. It is
descriptive, not aspirational; the target behaviour is defined in the later
sections.

### Kiosk (`radiantwave`)

- **License validation.** `POST /api/v2/license` with body
  `{"license_key": "...", "email_address": "..."}`. Implemented in
  `src/network/api_client.cpp` (`validateLicense`, `parseLicenseJson`) and
  consumed by `src/network/license_service.cpp` (`validateStoredLicense`,
  `markLicenseVerified`, `isLicenseWithinGracePeriod`). A 2xx response is the
  device's "subscribed" flag; a 7-day offline grace window is stored as
  `license_last_verified` in `system_kv` (`src/db/db_keys.h`). Response body
  currently read: `{key, email_address}`; additional fields are ignored.
- **Schedule fetch.** `GET /api/v2/schedule?email=<email>&licenseKey=<key>`
  (`src/network/api_client.cpp`: `fetchSchedule`, `parseScheduleJson`;
  `PATH_SCHEDULE = "/schedule"`). Response shape read by the Kiosk:
  `{email, blocks: [{id, startMinutes, endMinutes, overnight, durationMinutes,
dynamicAudio, proclamationIds}]}`. `dynamicAudio` is optional on the wire and
  defaults to `true` in `parseScheduleJson`. Missing/blank credentials cause an
  early `false`.
- **Schedule persistence.** SQLite tables `schedule_blocks` and
  `schedule_block_proclamations` (`src/db/database_manager.cpp:185`,
  `replaceScheduleBlocks` at `:1105`, `getScheduleBlocks` at `:1169`). Full
  replace; block `sort_order` and per-block proclamation `position` preserved.
  No day-of-week column and no schedule `type`; the model is implicitly daily.
- **Schedule sync.** `syncScheduleFromApi` (`src/network/proclamation_sync.cpp:172`)
  is invoked only as a **best-effort** side effect of
  `syncProclamationsFromApi` (`:168`). There is no boot sync, no network-up
  sync, no periodic timer, and no conditional GET (`If-None-Match`/ETag).
  `syncProclamationsFromApi` is called from `Home::syncProclamationsIfEmpty`
  (`src/home.cpp:461`) and `ProclamationOptionsPage::onPush`
  (`src/proclamation_options_page.cpp:49`). There is no explicit atomic
  schedule cache file; the SQLite database is the durable store.
- **Schedule playback.** `src/scroller_page.cpp` selects the active block by
  comparing `timezone::currentLocalMinutes(cfg.timezone)`
  (`src/timezone_helper.h`) against each block via
  `scroller::minuteInScheduleBlock` (`src/scroller_streams.h:31`). Block
  selection is daily-only (no day-of-week). An active block's ordered
  `proclamation_ids` replace the local selection
  (`src/scroller_streams.cpp:57`). `effectiveDynamicAudio()`
  (`src/scroller_page.cpp:302`) forces dynamic audio when the active block has
  `dynamic_audio == true`, otherwise the device-wide
  `config.audio.dynamic_audio` applies. A block change is latched in
  `scheduleChangePending_` and applied at the next proclamation boundary.
- **Settings persistence.** `~/.local/radiantwave/config.yaml` (YAML) via
  `ConfigManager` (`src/config/config_manager.cpp`, `src/config/yaml_parser.cpp`,
  schema in `src/config/app_config.h`): `timezone`, `audio.dynamic_audio`,
  `proclamation.schedule_active` (Kiosk-local on/off toggle, default `false`).
  Identity lives in SQLite `system_kv` (`email_address`, `license_key`,
  `license_last_verified`). There is no System Name anywhere.
- **Conventions.** `API_BASE_URL = "https://portal.radiantwavetech.com/api/v2"`
  (`src/network/api_client.h`). Kiosk API knowledge is mirrored in
  `openapi.yaml` at the repo root.

### Portal (`portal`)

- **Framework/tooling.** SvelteKit 2 + Svelte 5 + TypeScript + Tailwind v4;
  Prisma 7 over PostgreSQL; Vitest. Migrations: Prisma Migrate
  (`prisma/schema.prisma`, `prisma/migrations/`, `npm run migrate`,
  `npm run deploy`; config in `prisma.config.ts`). API routes under
  `src/routes/api/v1/` (API-key gated) and `src/routes/api/v2/`
  (unauthenticated). v2 helpers: `src/lib/server/v2-helpers.ts`
  (`jsonOk`, `jsonError`, `readJsonBody`, `rateLimited`, `clientIp`); errors
  are `{ "message": "<text>" }`.
- **License validation.** `POST /api/v2/license`
  (`src/routes/api/v2/license/+server.ts`): validates `license_key` +
  `email_address`, requires the key be active and owned by the account, stamps
  `LicenseKey.lastValidatedAt`, returns `serializeLicense({key, emailAddress})`
  (`src/lib/server/v2-serializers.ts`). A v1 variant exists
  (`src/routes/api/v1/license/+server.ts`).
- **Schedule storage.** `Schedule` is **per user** (`userId String @unique`,
  `prisma/schema.prisma:263`), daily-only, `0..4` `Block`s. `Block`
  (`:275`) stores `startMinutes`/`endMinutes`, `dynamicAudio Boolean
@default(false)`, and ordered `BlockProclamations` (`sortOrder`). The schema
  comment states overnight ranges are disallowed in v1, yet the serializer and
  Kiosk both support `overnight` — a known inconsistency.
- **Schedule service/validation.** `src/lib/server/schedule.ts` (DB
  orchestration: `getOrCreateSchedule`, `listBlocks`, `createBlock`,
  `updateBlock`, `deleteBlock`) and the isomorphic
  `src/lib/schedule-utils.ts` (`MAX_BLOCKS = 4`, `SNAP_MINUTES = 15`,
  `validateBlock`, `findOverlap`, `isOvernight`, `blockDuration`,
  `blockSegments`, `formatTime`, `toHm`, `snapMinutes`). Validation enforces a
  4-block maximum on create, `startMinutes !== endMinutes`, at least one
  Proclamation, and no overlaps (overnight-aware via linear segments).
- **Schedule read API.** `GET /api/v2/schedule`
  (`src/routes/api/v2/schedule/+server.ts`): auth by paired `email` +
  `licenseKey` (legacy alias `key`) query params; checks only that the key
  belongs to the email's account (entitlement deliberately not checked); rate
  limited 10/min/IP; returns `{email, blocks: [serializeScheduleBlock(...)]}`
  where `serializeScheduleBlock` (`src/lib/server/v2-serializers.ts:165`) emits
  `{id, startTime, startMinutes, endTime, endMinutes, overnight,
durationMinutes, dynamicAudio, proclamationIds}`.
- **Schedule UI.** Protected user route
  `src/routes/(protected)/(user)/schedule/` (`+page.server.ts`,
  `+page.svelte`) with `src/lib/components/schedule/DaySchedule.svelte` (single
  24h day timeline, drag-to-create) and `BlockModal.svelte`. Dashboard
  (`(protected)/(user)/dashboard/`) lists the user's License Keys. No System
  Name is displayed or editable.

### Gaps between current state and target

- Schedule is per-user, not per-License-Key.
- No `daily`/`weekly` typing; no day-of-week storage or UI.
- No `version`/ETag, no conditional GET.
- Schedule GET requires `email` + `licenseKey`; there is no license-key-only
  route, no `/api/v2/licenses/...` namespace, and no system-name route.
- `dynamicAudio` DB default is `false`; the target default for new Blocks is
  `true`.
- No System Name field, validation, or display.
- Sync is opportunistic with no boot/network-up/5-minute cadence and no
  atomic cache file.
- Portal stores no timezone (matches target) and shows no informational
  geoip-derived timezone.

---

## Time semantics

- Times are **minute precision**, stored as 24-hour `"HH:MM"` strings
  representing **local wall-clock** time. AM/PM is display-only.
- Numerators may also be carried as integer minutes-from-midnight
  (`startMinutes`/`endMinutes`, `0..1440`) for the Kiosk; the string form is
  canonical on the wire.
- A Block is the **half-open interval `[start, end)`**.
- A Block may start on the same minute the previous Block ends (`end 07:00`,
  next `start 07:00` is valid and has no gap).
- A Block whose `end` is earlier than its `start` **crosses midnight** and
  belongs to its start day. In weekly mode, Sunday's crossing Block spills into
  Monday. `start == end` is **invalid** (zero- or full-length ambiguity).
- **Overlaps are invalid**, including spillover from a midnight-crossing Block
  into the next day's Blocks (or, in daily mode, into the same list's early
  Blocks). Touching boundaries are **not** overlaps.
- Gaps between Blocks are allowed. During a gap the Kiosk plays whatever
  Proclamations are selected locally on the Kiosk.
- The Kiosk evaluates Schedules in its own Timezone setting
  (`config.timezone`, IANA code). **The payload carries no timezone.** The
  Portal may show the user's geoip-derived timezone informationally only.

---

## Schedule data model (JSON)

Each License Key has **at most one** Schedule. `type` is `"daily"` or
`"weekly"` and determines the mode; there is no separate global mode. **No**
Schedule means `type` is `null`.

Suggested shape from the brief, adapted to existing field names (`start`/`end`
→ `startTime`/`endTime`, retaining the existing `startMinutes`/`endMinutes`
integers for the Kiosk):

```json
{
  "version": "<opaque string; also used as the ETag>",
  "type": "daily" | "weekly" | null,
  "daily": [ Block, ... ],
  "weekly": { "mon": [Block], "tue": [Block], "wed": [Block],
              "thu": [Block], "fri": [Block], "sat": [Block],
              "sun": [Block] },
  "blocks": [ LegacyBlock, ... ]
}
```

Block:

```json
{
	"id": "3f1c2b7a-9d4e-4c8a-b2f6-1a2b3c4d5e6f",
	"startTime": "21:00",
	"startMinutes": 1260,
	"endTime": "09:00",
	"endMinutes": 540,
	"overnight": true,
	"durationMinutes": 720,
	"proclamationIds": ["b40fdcb9-703c-420e-af32-a081964c6f08"],
	"dynamicAudio": true
}
```

- `version` is an opaque string derived from the Schedule content (see
  [Endpoints](#endpoints)). It is implementation-defined and must change
  whenever the serialized schedule changes.
- **Only the fields for the active type are populated.** For `type: "daily"`,
  `daily` is populated and `weekly` is omitted or empty. For `type: "weekly"`,
  `weekly` is populated with all seven keys and `daily` is omitted or empty.
  For `type: null`, both are empty/omitted.
- `weekly` always contains all seven lowercase keys `mon`..`sun`; a day with no
  Blocks is an empty array.
- `blocks` is the **legacy flattening** retained for older Kiosks (see
  [Backward compatibility](#backward-compatibility)). It uses the existing
  `LegacyBlock` shape serialized by the current portal
  (`{id, startTime, startMinutes, endTime, endMinutes, overnight,
durationMinutes, dynamicAudio, proclamationIds}`). For `type: "weekly"`,
  `blocks` is an **empty array** (the server does not know the Kiosk's
  timezone and cannot flatten weekly to a single day).
- `proclamationIds` is the ordered play list (order is significant);
  duplicates are not meaningful and are de-duplicated by the Portal.
- `dynamicAudio` defaults to `true` for new Blocks created on the Portal.
- Proclamation **content** is never included; the Kiosk fetches content
  separately via `/api/v2/proclamations`. Portal users only ever see
  title/category/group.

---

## Validation rules

These are enforced by the Portal (authoritative) and defended against by the
Kiosk.

1. A Schedule belongs to exactly one License Key; a License Key has at most one
   Schedule.
2. `type` is one of `"daily"`, `"weekly"`, or `null`.
3. A Block has `start` and `end` times; `start == end` is invalid.
4. `end < start` denotes a midnight-crossing Block belonging to its start day.
5. Blocks within a day (and the spillover of a midnight-crossing Block into the
   following day) must not overlap. Touching boundaries are allowed.
6. Weekly modes apply rules 3–5 independently per day; a `sun` Block crossing
   midnight must not overlap `mon` early Blocks.
7. A Block must contain at least one Proclamation. Empty Blocks are rejected
   server-side. The Kiosk defensively **skips invalid Blocks** and treats them
   as gaps.
8. Gaps are allowed; during a gap local Kiosk selection applies.
9. `dynamicAudio` is a boolean; absent means `true` for new Blocks.
10. Times are minute-precision `HH:MM` strings; the Portal snaps UI input to
    `SNAP_MINUTES` (15) with a `MINUTE_STEP` (5) constraint from the existing
    helpers.
11. The existing Portal cap of `MAX_BLOCKS = 4` per day list is **retained**
    for Phase 0 (see [Open items](#open-items)).

The Kiosk must not crash on, and must not play, an invalid Block: it skips it.

---

## Endpoints

The API remains **unauthenticated** (no API keys) for v2. This is a known
limitation and is recorded under [Open items](#open-items).

All new endpoints live under the existing versioned namespace
`/api/v2/...` to preserve conventions. v1 routes are unchanged.

### (a) License validation — existing, additive

`POST /api/v2/license`

Request (existing fields unchanged; `systemName` additive and optional):

```json
{
	"license_key": "ABCD-EFGH-IJKL-MNOP",
	"email_address": "jane@example.com",
	"systemName": "Living Room"
}
```

Response (existing fields unchanged; `systemNameStatus` additive):

```json
{ "key": "ABCD-EFGH-IJKL-MNOP", "email_address": "jane@example.com", "systemNameStatus": "ok" }
```

- `systemName` is optional. When present it is trimmed; when absent the stored
  name is left untouched.
- `systemNameStatus` ∈ `{"ok", "unchanged", "conflict", "invalid"}`:
  - `ok` — name was set or updated.
  - `unchanged` — omitted, or identical after trim/case-insensitive compare.
  - `conflict` — another License Key on the same account already holds the name.
  - `invalid` — trimmed length outside 1–40.
- **Validation itself succeeds regardless of name status.** A non-`ok` status
  never fails the license check; the Kiosk treats it as advisory.
- Errors and rate limiting follow the existing endpoint (400 messages,
  413 body cap, 429 with `Retry-After`).

### (b) Set System Name — Kiosk-facing

`PUT /api/v2/licenses/{licenseKey}/system-name`

Request:

```json
{ "systemName": "Living Room" }
```

Responses:

| Status                | Condition                                 | Body                                              |
| --------------------- | ----------------------------------------- | ------------------------------------------------- |
| 200                   | Name set/updated (or unchanged)           | `{"systemName": "...", "systemNameStatus": "ok"}` |
| 400 `invalid_name`    | Trimmed length outside 1–40               | `{"message": "invalid_name"}`                     |
| 404 `unknown_license` | No License Key matches                    | `{"message": "unknown_license"}`                  |
| 409 `name_taken`      | Another key on the account holds the name | `{"message": "name_taken"}`                       |

- The Kiosk is the **only** writer. The Portal has no rename capability.
- The response body uses the existing v2 error convention
  (`{"message": "<code>"}`).
- Rate limited at the existing 10 requests/min/IP convention.

### (c) Get Schedule — Kiosk-facing, key-only, conditional

`GET /api/v2/licenses/{licenseKey}/schedule`

- 200 with `ETag: "<version>"` and the payload from
  [Schedule data model](#schedule-data-model-json). A License Key with no
  Schedule returns 200 with `type: null` and empty lists.
- `304 Not Modified` when the request's `If-None-Match` matches the current
  `ETag`.
- `404` (`unknown_license`) when no License Key matches.
- `version` doubles as the ETag value; the header value is the quoted form.
- The response is the **target** payload (`version`, `type`, `daily`, `weekly`,
  `blocks`).
- Rate limited at the existing 10 requests/min/IP convention.

### (d) Legacy schedule read — existing, evolved additively

`GET /api/v2/schedule?email=<email>&licenseKey=<key>` remains supported with
its existing auth semantics. Its response is extended **additively** with the
same `version`, `type`, `daily`, and `weekly` fields, while continuing to
populate `email` and `blocks` exactly as before. Old Kiosks ignore the new
fields; new Kiosks may read either endpoint. This endpoint does **not** emit an
ETag and does **not** return 304.

### (e) Portal-internal endpoints (names & purpose only)

Finalized in Phases 3 and 4. They are **not** Kiosk-facing.

- `POST /api/v2/...` / server actions for Schedule CRUD (create/update/delete
  Block, set `type`, assign Proclamations) — Phase 3.
- `POST .../copy` to copy a Schedule between License Keys on the same account —
  Phase 4.

Exact paths and payloads are deferred; they will be recorded here when added.

---

## Sync behavior

Target Kiosk sync (defaults; adjust only if the code forces it):

- The Kiosk pulls the Schedule:
  - on boot,
  - on network-up,
  - every 5 minutes.
- Pulls use conditional GET (`If-None-Match` / ETag); a `304` leaves the cache
  untouched.
- The last Schedule is cached to disk with an **atomic write** and used offline.
- The schedule on/off toggle is **Kiosk-local** (existing
  `proclamation.schedule_active`) and is not synced.
- With no cache and no network, the Kiosk behaves as if schedules are off
  (local Proclamation selection applies).
- During gaps, or when schedules are off, the local audio selection applies.

Current-state deltas (to be closed by later phases): no boot/network-up/5-minute
cadence, no ETag, no explicit atomic cache file. These are recorded under
[Touchpoints per phase](#touchpoints-per-phase).

Identity for sync is the License Key. The legacy schedule endpoint additionally
requires the paired email; the new endpoint uses the License Key alone.

---

## System Name rules

- A System Name is a human-readable label for a License Key (e.g.
  "Living Room"). It is a **label only** — never used as a reference or key.
- Unique **per account**, compared **case-insensitively**.
- Trimmed, **1–40 characters**.
- Set or changed **only via the Kiosk**. The Portal displays it **read-only**
  and has no rename capability.
- The Portal falls back to displaying the License Key when no name is set.
- A Kiosk that omits `systemName` never clears an existing name.
- Wire representations: request field `systemName`; status field
  `systemNameStatus` ∈ `{"ok","unchanged","conflict","invalid"}` (see
  [Endpoints](#endpoints)).

---

## Dynamic audio

- Each Block has a boolean `dynamicAudio`.
- The Portal defaults it to **`true` for new Blocks**.
- `true` ⇒ the Kiosk uses dynamic audio for that Block.
- `false` ⇒ the Kiosk uses its locally chosen audio.
- During gaps, or when schedules are off, the local audio selection applies
  (existing `config.audio.dynamic_audio` / fixed track).
- Kiosk parsing defaults an absent `dynamicAudio` to `true`.

---

## Backward compatibility

All existing endpoints and payloads keep working for Kiosks already in the
field. New fields are **additive**; no v2 field is removed or renamed, and v1
is untouched.

- **Old Kiosk vs new Portal.** An old Kiosk calls
  `POST /api/v2/license` (no `systemName`) and
  `GET /api/v2/schedule?email&licenseKey`, reading `blocks` and ignoring
  unknown fields. The Portal keeps both, keeps the `blocks` shape byte-
  compatible, and adds `version`/`type`/`daily`/`weekly` as extra fields. The
  old Kiosk is unaffected and ignores `systemNameStatus`.
- **Daily schedules.** For `type: "daily"`, `blocks` is the flattened daily
  list; an old Kiosk behaves exactly as today.
- **Weekly schedules.** `blocks` is an **empty array**. An old Kiosk therefore
  sees no schedule and falls back to local Proclamation/audio selection. It
  cannot interpret weekly schedules; this is accepted and recorded under
  [Open items](#open-items).
- **No schedule.** `type: null`, `blocks: []`; both old and new Kiosks fall
  back to local selection.
- **Omission of `systemName`** by an old Kiosk never clears an existing name;
  `systemNameStatus` is simply ignored.
- The new endpoints are additive; their absence on old Kiosks is irrelevant.

---

## Touchpoints per phase

File/module candidates each later phase will change. Phase numbering is assumed
from the brief (Phase 3 = Portal schedule CRUD, Phase 4 = Portal schedule copy)
and is recorded under [Open items](#open-items).

### Kiosk (`radiantwave`)

- **Phase 1 (Kiosk scheduler UI, storage, sync, playback)**
  - `src/network/api_client.h` / `src/network/api_client.cpp` — parse
    `version`/`type`/`daily`/`weekly`, ETag/`If-None-Match`, `PUT`
    system-name, `systemNameStatus`.
  - `src/network/proclamation_sync.h` / `.cpp` — boot/network-up/5-minute
    schedule sync, conditional GET, atomic cache.
  - `src/network/license_service.h` / `.cpp` — send `systemName`, handle
    `systemNameStatus`.
  - `src/db/db_keys.h` — System Name / ETag keys; `src/db/database_manager.h`
    / `.cpp` — schedule `type`/day-of-week storage, cache.
  - `src/scroller_page.h` / `.cpp`, `src/scroller_streams.h` / `.cpp` —
    day-of-week Block selection, spillover.
  - `src/timezone_helper.h` — local day-of-week.
  - `src/config/app_config.h`, `src/config/config_manager.cpp`,
    `src/config/yaml_parser.cpp` — settings surface.
  - New page(s) for setting the System Name; tests in `tests/` registered in
    `CMakeLists.txt`.

### Portal (`portal`)

- **Phase 2 (System Name + license validation)**
  - `prisma/schema.prisma` + migration — `LicenseKey.systemName` and
    case-insensitive uniqueness.
  - `src/routes/api/v2/license/+server.ts` — `systemName` /
    `systemNameStatus`.
  - `src/routes/api/v2/licenses/[licenseKey]/system-name/+server.ts` — new.
  - `src/lib/server/v2-serializers.ts`, `src/lib/server/v2-helpers.ts`.
  - Dashboard read-only display.
- **Phase 3 (Schedule CRUD: daily/weekly, per-License-Key)**
  - `prisma/schema.prisma` + migration — Schedule per License Key, `type`,
    day-of-week.
  - `src/lib/server/schedule.ts`, `src/lib/schedule-utils.ts` — weekly,
    per-license orchestration, cross-day validation.
  - `src/lib/server/v2-serializers.ts` — `version`/`type`/`daily`/`weekly`.
  - `src/routes/api/v2/licenses/[licenseKey]/schedule/+server.ts` — new
    (ETag/304).
  - `src/routes/api/v2/schedule/+server.ts` — additive evolution.
  - `src/routes/(protected)/(user)/schedule/*`,
    `src/lib/components/schedule/*` — weekly UI, per-license selection.
  - Specs: `schedule.spec.ts`, `page.server.spec.ts`, `schedule-utils.spec.ts`.
- **Phase 4 (Schedule copy)**
  - Copy service in `src/lib/server/schedule.ts`; copy route/action; UI.
- **All phases** — `docs/openapi.yaml`, this contract, `docs/fixtures/`.

---

## Open items

Recorded ambiguities and conservative choices. Each is subject to change in a
later phase.

1. **Phase numbering.** The brief names Phases 3 (CRUD) and 4 (copy) only;
   Phase 1 (Kiosk) and Phase 2 (System Name) are assumed here.
2. **`blocks` for weekly.** Chosen as an empty array (server cannot know the
   Kiosk timezone). Consequence: old Kiosks see weekly schedules as "no
   schedule".
3. **Block cap.** The existing `MAX_BLOCKS = 4` per day list is retained; the
   brief does not state a cap. Whether weekly allows 4/day or 4 total is
   unresolved.
4. **Field naming.** The brief's `start`/`end` were mapped to the existing
   `startTime`/`endTime`; `startMinutes`/`endMinutes` retained for the Kiosk.
5. **`version` derivation.** Algorithm (content hash vs max `updatedAt` +
   shape) deferred to implementation; it must be stable for equal content and
   change on mutation.
6. **Unauthenticated key-only access.** The new endpoints authenticate by
   License Key alone (per glossary). Anyone who knows a key could read the
   schedule or set the name. Mitigated only by the 10/min/IP rate limit. Known
   limitation.
7. **`dynamicAudio` default flip.** DB default changes `false` → `true` for
   **new** Blocks; existing Blocks are left at their stored values (no
   backfill assumed).
8. **Per-user → per-License-Key migration.** Accounts with multiple License
   Keys: which key inherits the existing per-user Schedule is unresolved;
   conservative default is the account's first/oldest key.
9. **Cross-day spillover validation.** Weekly `sun` spillover into `mon` (and
   daily same-list spillover) must be validated; exact error messaging is
   deferred.
10. **Account scope for name uniqueness.** "Per account" = the owning User.
    Legacy License Keys with only an `email` and no `userId` are an edge case.
11. **Geoip timezone display.** Informational only, not implemented in the
    Portal today.
12. **ETag on the legacy endpoint.** The legacy `GET /api/v2/schedule` emits no
    ETag and never returns 304, to preserve old behaviour.
13. **`systemNameStatus` on v1.** Not added; v1 is unchanged.
14. **Trim/case representation.** Names are trimmed; uniqueness is
    case-insensitive; the stored casing is preserved as provided.
15. **Sync cadence.** The brief's boot/network-up/5-minute defaults are
    targets; the current Kiosk has no such timer.
16. **Atomic cache file.** Path and format deferred; SQLite is the current
    durable store.
17. **`type` encoding for no schedule.** `type: null`; `daily`/`weekly` absent
    or empty.
18. **Legacy alias.** `key` remains accepted as a `licenseKey` alias on the
    legacy schedule endpoint.

---

## Changelog

- 2026-09-29 — Initial contract created (Phase 0). Documents current state,
  target time semantics, schedule data model, validation rules, endpoints
  (`/api/v2/licenses/...`, additive license-validation fields), sync behavior,
  System Name rules, dynamic audio, backward compatibility, touchpoints,
  open items, and fixtures.