ut42tech · ut42tech · May 22, 2026 · May 19, 2026 · May 22, 2026
diff --git a/apps/admin/src/app/(authed)/pre-registrations/page.tsx b/apps/admin/src/app/(authed)/pre-registrations/page.tsx
@@ -226,18 +226,20 @@ function ActivatedPreRegistrationsTable({ items }: { items: ActivatedPreRegistra
   );
 }
 
-const DEFAULT_GRADE: Grade = '小1';
-
 function CreatePreRegistrationForm({ onCreated }: { onCreated: () => Promise<void> }) {
   const [fullName, setFullName] = useState('');
   const [nickname, setNickname] = useState('');
-  const [grade, setGrade] = useState<Grade>(DEFAULT_GRADE);
+  const [grade, setGrade] = useState<Grade | ''>('');
   const [registeredAt, setRegisteredAt] = useState(todayInJst());
   const [busy, setBusy] = useState(false);
 
   const submit = async (e: FormEvent) => {
     e.preventDefault();
     if (busy) return;
+    if (!grade) {
+      toastError(new Error('学年を選択してください'), '入力内容を確認してください');
+      return;
+    }
     setBusy(true);
     try {
       const body: CreatePreRegistrationRequest = {
@@ -253,7 +255,7 @@ function CreatePreRegistrationForm({ onCreated }: { onCreated: () => Promise<voi
       toastSuccess(`${created.preRegistrationId} を追加しました`);
       setFullName('');
       setNickname('');
-      setGrade(DEFAULT_GRADE);
+      setGrade('');
       setRegisteredAt(todayInJst());
       await onCreated();
     } catch (e) {
@@ -298,7 +300,7 @@ function CreatePreRegistrationForm({ onCreated }: { onCreated: () => Promise<voi
               <Label>学年</Label>
               <Select value={grade} onValueChange={(value) => setGrade(value as Grade)}>
                 <SelectTrigger className="w-full">
-                  <SelectValue />
+                  <SelectValue placeholder="選択してください" />
                 </SelectTrigger>
                 <SelectContent>
                   {GRADES.map((g) => (

diff --git a/docs/architecture.md b/docs/architecture.md
@@ -0,0 +1,284 @@
+# Tecnova Platform Architecture
+
+This document captures the current Tecnova Nagasaki operations platform and its
+planned expansion scope.
+
+The first diagram is a compact current-state overview. The detailed map below it
+keeps the broader current and planned scope in one Mermaid `architecture-beta`
+diagram. Mermaid brand logos require renderer-level icon-pack registration, so
+the portable diagrams use text labels and the brand logos are shown as badges.
+
+## Current Implementation Overview
+
+<p align="center">
+  <img src="https://img.shields.io/badge/Next.js-16-000?logo=next.js&logoColor=white" alt="Next.js 16">
+  <img src="https://img.shields.io/badge/React-19-61DAFB?logo=react&logoColor=black" alt="React 19">
+  <img src="https://img.shields.io/badge/Hono-4-E36002?logo=hono&logoColor=white" alt="Hono 4">
+  <img src="https://img.shields.io/badge/Cloudflare_Workers-F38020?logo=cloudflare&logoColor=white" alt="Cloudflare Workers">
+  <img src="https://img.shields.io/badge/Cloudflare_D1-SQLite-F38020?logo=cloudflare&logoColor=white" alt="Cloudflare D1">
+  <img src="https://img.shields.io/badge/Drizzle_ORM-0.45-C5F74F?logo=drizzle&logoColor=black" alt="Drizzle ORM">
+  <img src="https://img.shields.io/badge/Google_Sheets-API-34A853?logo=googlesheets&logoColor=white" alt="Google Sheets API">
+  <img src="https://img.shields.io/badge/Google_OAuth-Better_Auth-4285F4?logo=google&logoColor=white" alt="Google OAuth and Better Auth">
+  <img src="https://img.shields.io/badge/Vercel-Deploy-000?logo=vercel&logoColor=white" alt="Vercel">
+  <img src="https://img.shields.io/badge/GitHub_Actions-CI-2088FF?logo=githubactions&logoColor=white" alt="GitHub Actions">
+</p>
+
+```mermaid
+flowchart LR
+  subgraph devices["Operation Devices"]
+    ipad["Reception iPad"]
+    pc["Admin PC"]
+  end
+
+  subgraph frontend["Vercel Frontend"]
+    checkin["Checkin PWA<br/>Next.js 16 / React 19<br/>ZXing QR Scan"]
+    admin["Admin Dashboard<br/>Next.js 16 / React 19"]
+    ui["Shared UI<br/>shadcn/ui / Tailwind CSS<br/>apiFetch / MeProvider"]
+  end
+
+  subgraph api["Cloudflare Workers API"]
+    hono["Hono REST API"]
+    betterAuth["Better Auth<br/>Google OAuth Sessions"]
+    d1[("Cloudflare D1<br/>SQLite")]
+  end
+
+  subgraph data["Current Data Model"]
+    participants[("participants")]
+    events[("events")]
+    sessions[("sessions")]
+    mentors[("mentors")]
+    authTables[("Better Auth tables")]
+  end
+
+  subgraph google["Google Workspace"]
+    oauth["Google OAuth"]
+    sheets["Student Google Sheet<br/>Sheets API"]
+    gas["GAS Webhook"]
+    drive["Drive Folders"]
+  end
+
+  subgraph repo["Monorepo And Delivery"]
+    workspace["pnpm / Turborepo<br/>TypeScript / Zod / Drizzle"]
+    ci["GitHub Actions<br/>Biome / Type Check"]
+    deploy["Wrangler + Vercel Deploy"]
+  end
+
+  ipad --> checkin
+  pc --> admin
+  checkin --> ui
+  admin --> ui
+  checkin --> hono
+  admin --> hono
+
+  hono --> betterAuth
+  betterAuth --> oauth
+  betterAuth --> mentors
+  hono --> d1
+  d1 --> participants
+  d1 --> events
+  d1 --> sessions
+  d1 --> mentors
+  d1 --> authTables
+
+  hono --> sheets
+  hono -. waitUntil .-> gas
+  gas --> drive
+
+  workspace --> checkin
+  workspace --> admin
+  workspace --> hono
+  workspace --> d1
+  ci --> deploy
+  deploy --> checkin
+  deploy --> admin
+  deploy --> hono
+  deploy --> d1
+
+  classDef device fill:#f8fafc,stroke:#64748b,color:#0f172a;
+  classDef frontend fill:#e8f3ff,stroke:#2563eb,color:#0f172a;
+  classDef backend fill:#fff7ed,stroke:#f97316,color:#0f172a;
+  classDef db fill:#ecfdf5,stroke:#16a34a,color:#0f172a;
+  classDef external fill:#fefce8,stroke:#ca8a04,color:#0f172a;
+  classDef ops fill:#f5f3ff,stroke:#7c3aed,color:#0f172a;
+
+  class ipad,pc device;
+  class checkin,admin,ui frontend;
+  class hono,betterAuth backend;
+  class d1,participants,events,sessions,mentors,authTables db;
+  class oauth,sheets,gas,drive external;
+  class workspace,ci,deploy ops;
+```
+
+## Detailed Architecture Map
+
+```mermaid
+architecture-beta
+  group people(internet)[People And Devices]
+  service child_kiosk(server)[Child And Reception iPad] in people
+  service mentor_phone(server)[Mentor Smartphone Future] in people
+  service admin_pc(server)[Admin PC Browser] in people
+  service researcher_pc(server)[Researcher Analysis PC Future] in people
+  service parent_browser(server)[Parent Browser Future] in people
+
+  group frontend(cloud)[Vercel Frontend Apps]
+  service checkin_app(server)[apps checkin Next PWA Current] in frontend
+  service admin_app(server)[apps admin Next Web Current] in frontend
+  service mentor_app(server)[apps mentor Next PWA Future] in frontend
+  service analytics_app(server)[Analytics Dashboard Future] in frontend
+  service parent_app(server)[Parent View Future] in frontend
+
+  group edge(cloud)[Cloudflare Edge Platform]
+  service worker(server)[apps api Hono Workers Current] in edge
+  service d1(database)[Cloudflare D1 SQLite Current] in edge
+  service r2(disk)[Cloudflare R2 Future] in edge
+  service public_api(server)[Public API Future] in edge
+  service api_keys(server)[API Key Auth Future] in edge
+
+  group auth(cloud)[Authentication Boundary]
+  service better_auth(server)[Better Auth Current] in auth
+  service google_oauth(internet)[Google OAuth Current] in auth
+  service mentor_allowlist(database)[Mentors Allowlist Current] in auth
+  service session_cookie(disk)[Session Cookies Current] in auth
+
+  group google(internet)[Google Workspace Services]
+  service student_sheet(disk)[Student Sheet Current] in google
+  service teacher_sheet(disk)[Teacher Sheet Future Sync] in google
+  service sheets_api(server)[Google Sheets API Current] in google
+  service gas_drive(server)[GAS Drive Webhook Current] in google
+  service drive_folder(disk)[Participant Drive Folders Current] in google
+  service form_feed(server)[Google Form Feed External] in google
+
+  group core(server)[Current Backend Domain]
+  service participants(database)[Participants Current] in core
+  service events(database)[Events Current] in core
+  service sessions(database)[Sessions Current] in core
+  service mentors(database)[Mentors Current] in core
+  service auth_tables(database)[Better Auth Tables Current] in core
+
+  group planned(server)[Planned Domain Model]
+  service activity_logs(database)[Activity Logs Future] in planned
+  service activity_categories(database)[Activity Categories Future] in planned
+  service equipment(database)[Equipment Master Future] in planned
+  service collaborators(database)[Collaborators Future] in planned
+  service reflection_ocr(server)[Vision LLM OCR Future] in planned
+  service csv_export(disk)[CSV Export Future] in planned
+  service offline_sync(server)[Offline Sync Future] in planned
+  service crowd_status(server)[Crowd Status Future] in planned
+
+  group packages(disk)[Monorepo Shared Packages]
+  service ui_pkg(disk)[packages ui Current] in packages
+  service shared_pkg(disk)[packages shared Current] in packages
+  service db_pkg(disk)[packages db Current] in packages
+  service schemas_pkg(disk)[Zod Schemas Current] in packages
+  service sheets_client(disk)[Sheets Client Current] in packages
+  service migrations(disk)[Drizzle Migrations Current] in packages
+
+  group delivery(cloud)[Delivery And Operations]
+  service github(server)[GitHub Repository Current] in delivery
+  service actions(server)[GitHub Actions Current] in delivery
+  service ci(server)[Biome And Type Check Current] in delivery
+  service deploy_api(server)[Wrangler Deploy Current] in delivery
+  service vercel_deploy(server)[Vercel Deploy Current] in delivery
+  service secrets(disk)[Wrangler And Vercel Secrets Current] in delivery
+  service ops_manual(disk)[Runbook And Rehearsal Current] in delivery
+  service legacy_import(disk)[Prior Year D1 Import Future] in delivery
+
+  child_kiosk:R --> L:checkin_app
+  mentor_phone:R --> L:mentor_app
+  admin_pc:R --> L:admin_app
+  researcher_pc:R --> L:analytics_app
+  parent_browser:R --> L:parent_app
+
+  checkin_app:R --> L:worker
+  admin_app:R --> L:worker
+  mentor_app:R --> L:worker
+  analytics_app:R --> L:worker
+  parent_app:R --> L:public_api
+
+  checkin_app:T --> B:ui_pkg
+  admin_app:T --> B:ui_pkg
+  mentor_app:T --> B:ui_pkg
+  checkin_app:B --> T:shared_pkg
+  admin_app:B --> T:shared_pkg
+  mentor_app:B --> T:shared_pkg
+
+  worker:L --> R:better_auth
+  better_auth:R --> L:google_oauth
+  better_auth:B --> T:session_cookie
+  better_auth:T --> B:mentor_allowlist
+  mentor_allowlist:R --> L:mentors
+
+  worker:B --> T:d1
+  d1:B --> T:participants
+  d1:B --> T:events
+  d1:B --> T:sessions
+  d1:B --> T:mentors
+  d1:B --> T:auth_tables
+  d1:R --> L:activity_logs
+  d1:R --> L:activity_categories
+  d1:R --> L:equipment
+  d1:R --> L:collaborators
+
+  worker:R --> L:sheets_api
+  sheets_api:R --> L:student_sheet
+  teacher_sheet:R --> L:student_sheet
+  form_feed:R --> L:teacher_sheet
+  worker:R --> L:gas_drive
+  gas_drive:R --> L:drive_folder
+
+  public_api:B --> T:api_keys
+  public_api:L --> R:worker
+  public_api:R --> L:crowd_status
+  worker:R --> L:r2
+  r2:R --> L:reflection_ocr
+  reflection_ocr:R --> L:activity_logs
+  activity_logs:B --> T:csv_export
+  activity_logs:R --> L:analytics_app
+  sessions:R --> L:crowd_status
+  offline_sync:L --> R:checkin_app
+  offline_sync:R --> L:worker
+
+  db_pkg:R --> L:d1
+  migrations:R --> L:d1
+  schemas_pkg:R --> L:shared_pkg
+  shared_pkg:R --> L:worker
+  sheets_client:R --> L:sheets_api
+
+  github:R --> L:actions
+  actions:R --> L:ci
+  actions:R --> L:deploy_api
+  actions:R --> L:vercel_deploy
+  deploy_api:R --> L:worker
+  deploy_api:B --> T:migrations
+  vercel_deploy:R --> L:checkin_app
+  vercel_deploy:R --> L:admin_app
+  vercel_deploy:R --> L:mentor_app
+  secrets:T --> B:worker
+  secrets:T --> B:checkin_app
+  secrets:T --> B:admin_app
+  ops_manual:R --> L:child_kiosk
+  legacy_import:R --> L:d1
+```
+
+## Legend
+
+- `Current` means the component exists in the repository or is already described
+  as deployed in the handoff notes.
+- `Future` means planned Phase 1.5 or Phase 2 scope from the requirements and
+  MVP documentation.
+- `/api/*` and `/checkin/*` both pass through Better Auth and the `mentors`
+  allowlist. Planned `/public/v1/*` traffic is separated behind API key auth.
+- The private teacher-managed sheet remains outside the in-house database. The
+  platform reads and writes only the student-facing sheet columns required for
+  operations.
+- Cloudflare D1 stores operational data as UTC epoch milliseconds, while event
+  dates and user-facing displays are resolved in JST.
+
+## Mermaid Notes
+
+- GitHub Markdown renders Mermaid blocks when they are fenced with the
+  `mermaid` language identifier.
+- Mermaid `architecture-beta` starts with `architecture-beta` and supports
+  `group`, `service`, and directional edge declarations.
+- Built-in architecture icons are limited to `cloud`, `database`, `disk`,
+  `internet`, and `server`; richer vendor icons require registered icon packs.
diff --git a/docs/handoff.md b/docs/handoff.md
@@ -242,6 +242,37 @@ Vercel URL を両方 Worker secret に登録済み。
 
 ---
 
+## 学年「その他」追加リリース手順（2026-05-22）
+
+学年の正規値に `その他` を追加し、旧値 `卒業` は運用データ更新で `その他` に置換する。
+スプレッドシートの実データは以下の手順で手動更新する。
+
+### デプロイ / 更新順序
+
+1. **新コードをデプロイ**:
+   - api: `pnpm --filter @tecnova/api deploy`
+   - admin / checkin: 通常の Vercel デプロイ（main マージで自動）
+2. **DB マイグレーション適用（remote）**:
+   ```bash
+   pnpm --filter @tecnova/api db:apply:remote
+   ```
+   `0003_graduated_grade_to_other.sql` が `participants.grade = '卒業'` を `その他` に更新する。
+3. **学生側スプシを手動更新**:
+   1. 対象スプレッドシートを開き、`participants` シートを確認する
+   2. 作業前にスプレッドシート全体、または `participants` シートを複製してバックアップする
+   3. D列「学年」を対象に検索またはフィルタで `卒業` を抽出する
+   4. 該当セルをすべて `その他` に置換する
+   5. D列で `卒業` を再検索し、0件であることを確認する
+   6. `小1`〜`高3` と `その他` 以外の値が残っていないか、必要に応じてD列を目視確認する
+4. **学年上げ運用の確認**:
+   - スプレッドシート側や外部運用で `卒業` を作っている場合、出力値を `その他` に変更する
+5. **動作確認**:
+   - admin の事前登録追加で学年初期値が未選択になっている
+   - `その他` を選んで新規追加できる
+   - 利用者一覧の `その他` フィルタで更新済みデータが表示される
+
+---
+
 ## 氏名（fullName）追加リリース手順（2026-05-13 着手）
 
 参加者データに **氏名（本名）** を追加した。学生側スプシは **B列に氏名を挿入** し、既存

diff --git a/docs/mvp.md b/docs/mvp.md
@@ -234,7 +234,7 @@ async function getOrCreateTodayEvent(
 | A   | 事前登録ID         | text     | PRE-2026-0001 形式                 | 教員側       |
 | B   | 氏名               | text     | 本名（識別補助）                   | 教員側       |
 | C   | ニックネーム       | text     | メイン識別子                       | 教員側       |
-| D   | 学年               | text     | 小1, 小4, 中2 等                   | 教員側       |
+| D   | 学年               | text     | 小1, 小4, 中2, その他 等           | 教員側       |
 | E   | 事前登録日         | date     | YYYY-MM-DD                         | 教員側       |
 | F   | 内製ID             | text     | 26001 等（バックエンドが書き込み） | バックエンド |
 | G   | アクティベート日時 | datetime | YYYY-MM-DD HH:mm:ss（同上）        | バックエンド |