fix(event-types): harden setup window + catalog validation (codex review)

Three review rounds on PR #801; fixes in response:

- isValidEventType: live catalog is authoritative when it has rows — a
  deleted or deactivated slug no longer validates via the legacy
  fallback (fallback now only serves an empty-catalog install)
- deleteEventType: refuse deleting the last (and last ACTIVE) type;
  updateEventType: refuse deactivating the last active type (unknown
  slugs are rejected since the validator change, so an empty active
  catalog would brick event creation)
- setup window fails closed: only an explicit stored `false` opens it
  (a portable-backup restore can leave the key absent) and a normal
  admin login durably closes it (abandoned-wizard case)
- reserved bootstrap keys (setup_wizard_completed, setup_token) are
  stripped from ALL generic settings upserts (/general, /security,
  /analytics, /seo) so the marker is genuinely one-way
- wizard step: deletes ordered so the catalog can never end up empty,
  and a genuinely failed system-type deletion reloads the list and
  stays on the step instead of advancing past the only window in which
  it can be retried
- CreateEventPage: snap the hardcoded initial 'wedding' selection to
  the first active type when the catalog no longer contains it
- v1 API: new GET /event-types (read scope) so token clients can
  discover valid slugs; OpenAPI enum replaced with the live-catalog
  description

backend/src/routes/adminEventTypes.js

@@ -178,7 +178,7 @@ router.put('/:id', adminAuth, requirePermission('settings.edit'), [
     if (error.code === 'NOT_FOUND') {
       return res.status(404).json({ error: error.message });
     }
-    if (error.code === 'DUPLICATE_SLUG_PREFIX') {
+    if (error.code === 'DUPLICATE_SLUG_PREFIX' || error.code === 'LAST_ACTIVE') {
       return res.status(400).json({ error: error.message });
     }
 
@@ -216,7 +216,7 @@ router.delete('/:id', adminAuth, requirePermission('settings.edit'), [
     if (error.code === 'NOT_FOUND') {
       return res.status(404).json({ error: error.message });
     }
-    if (error.code === 'SYSTEM_TYPE' || error.code === 'IN_USE') {
+    if (error.code === 'SYSTEM_TYPE' || error.code === 'IN_USE' || error.code === 'LAST_TYPE') {
       return res.status(400).json({ error: error.message });
     }
 

backend/src/routes/adminSettings.js

@@ -31,6 +31,19 @@ const watermarkGeneratorService = require('../services/watermarkGeneratorService
 
 const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../../storage');
 
+// Reserved first-run bootstrap keys — never writable through the generic
+// settings upserts in this file: setup_wizard_completed is a one-way marker
+// (#800; writing false would reopen system-event-type deletion) and
+// setup_token is the first-run bootstrap secret. Every handler that loops
+// arbitrary request keys into app_settings must strip these first.
+const RESERVED_SETTING_KEYS = ['setup_wizard_completed', 'setup_token'];
+const stripReservedSettingKeys = (settings) => {
+  for (const key of RESERVED_SETTING_KEYS) {
+    delete settings[key];
+  }
+  return settings;
+};
+
 // Configure multer for logo uploads
 const storage = multer.diskStorage({
   destination: async (req, file, cb) => {
@@ -906,7 +919,7 @@ router.put('/theme', adminAuth, requirePermission('settings.edit'), async (req,
 // Update general settings
 router.put('/general', adminAuth, requirePermission('settings.edit'), async (req, res) => {
   try {
-    const settings = { ...req.body };
+    const settings = stripReservedSettingKeys({ ...req.body });
     let uploadLimitTouched = false;
 
     const publicSiteKeysTouched = Object.keys(settings).some((key) => key.startsWith('general_public_site_'));
@@ -1017,7 +1030,7 @@ router.put('/general', adminAuth, requirePermission('settings.edit'), async (req
 // Update security settings
 router.put('/security', adminAuth, requirePermission('settings.edit'), async (req, res) => {
   try {
-    const settings = req.body;
+    const settings = stripReservedSettingKeys({ ...req.body });
 
     // Update or insert each setting
     for (const [key, value] of Object.entries(settings)) {
@@ -1055,7 +1068,7 @@ router.put('/security', adminAuth, requirePermission('settings.edit'), async (re
 // Update analytics settings
 router.put('/analytics', adminAuth, requirePermission('settings.edit'), async (req, res) => {
   try {
-    const settings = req.body;
+    const settings = stripReservedSettingKeys({ ...req.body });
 
     // Validate the provider switch (#663 Phase 1). Reject unknown values
     // so the dashboard route's factory doesn't have to defensively guard.
@@ -1110,7 +1123,7 @@ router.put('/analytics', adminAuth, requirePermission('settings.edit'), async (r
 // Update SEO settings
 router.put('/seo', adminAuth, requirePermission('settings.edit'), async (req, res) => {
   try {
-    const settings = req.body;
+    const settings = stripReservedSettingKeys({ ...req.body });
 
     // Validate seo_blocked_ai_agents is an array of strings
     if (settings.seo_blocked_ai_agents !== undefined) {

backend/src/routes/auth.js

@@ -45,6 +45,17 @@ const router = express.Router();
 async function completeAdminLogin(req, res, admin, ipAddress, userAgent, lockoutKey) {
   await trackSuccessfulLogin(lockoutKey, ipAddress, userAgent);
 
+  // A normal login means the first-run wizard is over — the wizard never hits
+  // this route (setup sets its cookie directly). Close the system-event-type
+  // deletion window durably even when the wizard was abandoned mid-way (#800).
+  // Best-effort: a failure here must never block a login.
+  try {
+    const setupService = require('../services/setupService');
+    if (!(await setupService.isSetupWizardCompleted())) {
+      await setupService.markSetupWizardCompleted();
+    }
+  } catch (_) { /* best-effort */ }
+
   await db('admin_users').where('id', admin.id).update({
     last_login: new Date(),
     last_login_ip: ipAddress

backend/src/routes/v1/events.js

@@ -81,7 +81,7 @@ const photoUpload = multer({
  *               event_name: { type: string }
  *               event_type:
  *                 type: string
- *                 enum: [wedding, birthday, corporate, other, family]
+ *                 description: "Slug of an active event type from the catalog (Settings → Event Types). Defaults on a fresh install: wedding, birthday, corporate, other. GET /api/v1/event-types lists the live values."
  *               event_date: { type: string, format: date, nullable: true }
  *               customer_name: { type: string, nullable: true }
  *               customer_email: { type: string, format: email, nullable: true }
@@ -455,6 +455,48 @@ router.get(
   }
 );
 
+// ──────────────────────────────────────────────────────────────────────────
+// GET /event-types — read (catalog discovery for event creation, #800)
+// ──────────────────────────────────────────────────────────────────────────
+
+/**
+ * @openapi
+ * /event-types:
+ *   get:
+ *     tags: [Events]
+ *     summary: List active event types
+ *     description: The slugs accepted as `event_type` when creating events. The catalog is admin-customizable (Settings → Event Types), so integrations should discover values here instead of hardcoding them.
+ *     security: [{ bearerAuth: [] }]
+ *     responses:
+ *       200:
+ *         description: Active event types
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 eventTypes:
+ *                   type: array
+ *                   items:
+ *                     type: object
+ *                     properties:
+ *                       slug_prefix: { type: string }
+ *                       name: { type: string }
+ *                       emoji: { type: string }
+ */
+router.get('/event-types', apiTokenAuth, requireApiScope('read'), async (req, res) => {
+  try {
+    const types = await db('event_types')
+      .where('is_active', formatBoolean(true))
+      .orderBy('display_order', 'asc')
+      .select('slug_prefix', 'name', 'emoji');
+    res.json({ eventTypes: types });
+  } catch (error) {
+    logger.error('v1 GET /event-types failed', { error: error.message });
+    res.status(500).json({ error: 'Failed to list event types' });
+  }
+});
+
 // ──────────────────────────────────────────────────────────────────────────
 // GET /events/:id — read
 // ──────────────────────────────────────────────────────────────────────────

backend/src/services/eventTypeService.js

@@ -67,13 +67,20 @@ const getEventTypeBySlugPrefix = async (slugPrefix) => {
 const isValidEventType = async (slugPrefix) => {
   const normalized = slugPrefix.toLowerCase();
 
-  // Check in database
+  // The live catalog is authoritative: a row decides by its active flag, and
+  // a slug the admin deleted (setup wizard, #800) or deactivated must NOT
+  // sneak back in through the legacy list below.
   const eventType = await getEventTypeBySlugPrefix(normalized);
-  if (eventType && eventType.is_active) {
-    return true;
+  if (eventType) {
+    return Boolean(eventType.is_active);
+  }
+  const anyType = await db('event_types').first('id');
+  if (anyType) {
+    return false;
   }
 
-  // Legacy fallback: Accept old hardcoded values for backward compatibility
+  // Legacy fallback: only for a degenerate install with an EMPTY catalog
+  // (pre-catalog schema drift) — accept the old hardcoded values.
   const legacyTypes = ['wedding', 'birthday', 'corporate', 'other'];
   return legacyTypes.includes(normalized);
 };
@@ -198,6 +205,19 @@ const updateEventType = async (id, updates) => {
   }
 
   if (updates.is_active !== undefined) {
+    // Deactivating the last active type would empty the ACTIVE catalog and
+    // brick event creation (unknown slugs are rejected since #800).
+    if (updates.is_active === false && eventType.is_active) {
+      const otherActive = await db('event_types')
+        .whereNot('id', id)
+        .where('is_active', formatBoolean(true))
+        .first('id');
+      if (!otherActive) {
+        const error = new Error('Cannot deactivate the last active event type — activate another one first.');
+        error.code = 'LAST_ACTIVE';
+        throw error;
+      }
+    }
     updateData.is_active = formatBoolean(updates.is_active);
   }
 
@@ -292,6 +312,28 @@ const deleteEventType = async (id) => {
     throw error;
   }
 
+  // Never delete the last remaining type — and never delete the last ACTIVE
+  // one either: event creation and the quote/contract default-type resolution
+  // both need at least one active catalog entry.
+  const remaining = await db('event_types').whereNot('id', id).count('id as count').first();
+  if (!remaining || parseInt(remaining.count) === 0) {
+    const error = new Error('Cannot delete the last event type — at least one must remain.');
+    error.code = 'LAST_TYPE';
+    throw error;
+  }
+  if (eventType.is_active) {
+    const remainingActive = await db('event_types')
+      .whereNot('id', id)
+      .where('is_active', formatBoolean(true))
+      .count('id as count')
+      .first();
+    if (!remainingActive || parseInt(remainingActive.count) === 0) {
+      const error = new Error('Cannot delete the last active event type — activate another one first.');
+      error.code = 'LAST_TYPE';
+      throw error;
+    }
+  }
+
   // Quotes carry event_type too (migration 146) — a dangling slug there would
   // corrupt the quote→event conversion default chain.
   if (await hasColumnCached('quotes', 'event_type')) {

backend/src/services/setupService.js

@@ -28,7 +28,12 @@ const SETUP_TOKEN_KEY = 'setup_token';
 const SETUP_WIZARD_COMPLETED_KEY = 'setup_wizard_completed';
 
 async function isSetupWizardCompleted() {
-  return (await getAppSetting(SETUP_WIZARD_COMPLETED_KEY)) === true;
+  // Fail closed: only an explicit stored `false` (seeded by migration 161 on
+  // a fresh, admin-less install) opens the deletion window. A missing row —
+  // e.g. app_settings replaced by a portable-backup restore that predates the
+  // migration, which will not rerun — means a configured instance, not a
+  // first run.
+  return (await getAppSetting(SETUP_WIZARD_COMPLETED_KEY)) !== false;
 }
 
 async function markSetupWizardCompleted() {