feat(gallery): branded URL shortener — /s/<slug> with OG injection (#699)

Issue 3 from #699 (@alexvaltchev's report): expose a custom-named short
URL per event that bots scrape for OG previews and browsers redirect to
the underlying gallery. WhatsApp / iMessage / Facebook cache the OG
metadata by the URL they crawl, so the SHORT URL becomes the cache key
— admins can rotate or split-test underlying gallery URLs without
re-pushing a fresh link to clients.

Additive feature; no existing route, table, or column is modified.

## Backend

- `gallery_short_urls` table (migration 150): id, short_slug UNIQUE,
  event_id FK CASCADE, target_path TEXT, created_by/at, hit_count,
  last_hit_at, deleted_at/by. hasTable-guarded so the migration is
  idempotent on re-run.

- `src/services/galleryShortUrlService.js` — validator + CRUD +
  resolver. Slug rules: `/^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$/`,
  reserved blocklist (admin, api, auth, gallery, og, s, login, ...).
  target_path snapshots at create-time from the event + global
  short-URL toggle, so a later flip of the toggle does NOT silently
  change where existing short URLs resolve.

- `src/routes/adminShortUrls.js` — `GET/POST
  /api/admin/events/:eventId/short-urls`, `DELETE
  /api/admin/short-urls/:id`. Structured errors: 400 INVALID_SLUG,
  409 SLUG_TAKEN (with `suggested`), 404 EVENT_NOT_FOUND. Gated by
  events.view / events.edit + requireEventOwnership.

- `server.js` /s/:shortSlug public route. Bot UA → server-render the
  same OG metadata the existing /og/gallery/<slug> handler produces,
  then override og:url to point at /s/<shortSlug> itself (cache-key
  invariant — social platforms key by the URL they scrape).
  Browser UA → 302 to target_path. Soft-deleted slug → 410 Gone
  (intentional-delete signal, distinct from 404 unknown slug).
  Hit accounting is fire-and-forget.

## Frontend

- `services/shortUrls.service.ts` — list/create/remove.
- `components/admin/ShortUrlsCard.tsx` — per-event card on the
  EventDetailsPage. Form for custom or auto-generated slug, list with
  copy-to-clipboard + soft-delete. SLUG_TAKEN error surfaces the
  service's `suggested` slug with a "use suggested" button.
- i18n: events.shortUrls.* added to EN + DE.

## Tests

78 new tests, all passing:

- `__tests__/utils/galleryShortUrlValidation.test.js` (48) — pure-
  function tests for validateSlug: accepts/rejects, reserved-slug
  blocklist, path-traversal + URL-injection vectors.
- `__tests__/integration/galleryShortUrls.test.js` (19) — service
  layer against a real SQLite DB. Covers custom + auto-generated
  slugs, collision + SLUG_TAKEN + suggested, target_path
  snapshotting (backward-compat invariant), soft-delete + slug
  rotation, hit counting.
- `__tests__/integration/galleryShortUrlRoute.test.js` (11) —
  HTTP-level: 302 redirect for browser UA, 200 + OG HTML for bot UA,
  og:url canonical points at /s/<slug>, 410 for soft-deleted +
  orphaned events, 404 unknown + malformed.

Regression sweep: 47 existing migration-chain integration tests still
pass; migration 150 is additive only.

## Backward compatibility

- Existing `/gallery/<slug>`, `/gallery/<32-hex-share-token>`,
  `/gallery/<slug>/show/<token>`, `/og/gallery/<slug>`,
  `/og/gallery/<slug>/cover` routes are untouched.
- The `/s/` namespace is new; no existing route lives there.
- Migration 150 only ADDs the new table — no ALTERs on existing
  schema, no destructive changes.
- target_path is snapshotted at create-time so flipping the global
  "Use short gallery URLs" setting after a short URL exists does NOT
  change where that short URL resolves.

backend/__tests__/integration/galleryShortUrlRoute.test.js

@@ -0,0 +1,231 @@
+/**
+ * HTTP-level tests for the `/s/:shortSlug` public resolver (#699).
+ *
+ * Verifies the contract the public route is expected to honour:
+ *   - Browser UA → 302 to target_path
+ *   - Social crawler UA → 200 with OG <meta>, canonical = /s/<slug>
+ *   - Soft-deleted slug → 410 Gone (intentional-delete signal)
+ *   - Unknown slug → 404 Not Found
+ *   - Hit count increments after successful resolutions (both shapes)
+ *
+ * Mirrors the production server.js wiring but doesn't load the whole
+ * server — the surrounding middleware (CORS, helmet, rate limiters)
+ * isn't part of this route's contract.
+ */
+const express = require('express');
+const request = require('supertest');
+
+const { bootCrmDb } = require('./helpers/crmDb');
+
+jest.setTimeout(60000);
+
+let db; let cleanup; let service; let app;
+
+beforeAll(async () => {
+  ({ db, cleanup } = await bootCrmDb());
+
+  // Persist a business_profile + business_name so buildOgMetadata's
+  // settings-based fields populate consistently.
+  const { upsertAppSetting } = require('../../src/utils/appSettings');
+  await upsertAppSetting('branding_company_name', JSON.stringify('Test Studio'), 'string');
+
+  service = require('../../src/services/galleryShortUrlService');
+  const {
+    isSocialCrawler, buildOgMetadata, renderOgHtml,
+  } = require('../../src/services/galleryOgService');
+
+  app = express();
+  app.get('/s/:shortSlug', async (req, res) => {
+    try {
+      const row = await service.findByShortSlug(req.params.shortSlug);
+      if (!row) return res.status(404).type('text/plain').send('Short URL not found');
+      if (row.deleted_at) return res.status(410).type('text/plain').send('Short URL has been removed');
+
+      if (isSocialCrawler(req.get('user-agent'))) {
+        const event = await db('events').where({ id: row.event_id }).first('slug');
+        if (event?.slug) {
+          const meta = await buildOgMetadata(event.slug, req.originalUrl);
+          const base = (process.env.FRONTEND_URL || 'http://localhost:3000').replace(/\/$/, '');
+          meta.url = `${base}/s/${row.short_slug}`;
+          res.set('Cache-Control', 'public, max-age=300');
+          res.set('Content-Type', 'text/html; charset=utf-8');
+          res.send(renderOgHtml(meta));
+          service.recordHit(row.id).catch(() => {});
+          return;
+        }
+        return res.status(410).type('text/plain').send('Short URL points at a deleted event');
+      }
+
+      service.recordHit(row.id).catch(() => {});
+      return res.redirect(302, row.target_path);
+    } catch (err) {
+      return res.status(500).type('text/plain').send(err.message);
+    }
+  });
+}, 120000);
+
+afterAll(async () => { if (cleanup) await cleanup(); });
+
+async function seedEventAndShortUrl({ slug = `evt-${Date.now()}`, shortSlug }) {
+  const farFuture = new Date(Date.now() + 365 * 86400000).toISOString();
+  const [eventId] = await db('events').insert({
+    slug,
+    event_type: 'wedding',
+    event_name: 'Test Event',
+    event_date: '2026-06-05',
+    password_hash: 'x',
+    expires_at: farFuture,
+    is_active: true,
+    is_archived: false,
+    share_link: slug,
+    share_token: `tok${Math.random().toString(36).slice(2, 12)}`,
+    welcome_message: null,
+  });
+  const row = await service.createShortUrl({
+    eventId, customSlug: shortSlug,
+  });
+  return { eventId, shortUrl: row };
+}
+
+// User-agent strings the production `isSocialCrawler` helper matches.
+// Snapshot known-true samples here so the test stays in sync if the
+// helper's allowlist evolves.
+const BOT_UA_WHATSAPP = 'WhatsApp/2.23.20.0';
+const BOT_UA_FACEBOOK = 'facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)';
+const BROWSER_UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15';
+
+describe('GET /s/:shortSlug — browser (302 redirect)', () => {
+  it('redirects to the snapshotted target_path with a 302', async () => {
+    const { shortUrl } = await seedEventAndShortUrl({
+      slug: 'browser-redirect', shortSlug: 'go-here',
+    });
+    const res = await request(app)
+      .get('/s/go-here')
+      .set('User-Agent', BROWSER_UA);
+    expect(res.status).toBe(302);
+    expect(res.headers.location).toBe(shortUrl.target_path);
+    expect(res.headers.location).toMatch(/^\/gallery\//);
+  });
+
+  it('increments hit_count on a browser hit (fire-and-forget — wait briefly)', async () => {
+    await seedEventAndShortUrl({
+      slug: 'hit-browser', shortSlug: 'hit-from-browser',
+    });
+    await request(app).get('/s/hit-from-browser').set('User-Agent', BROWSER_UA);
+    await new Promise((r) => setTimeout(r, 50));
+    const row = await service.findByShortSlug('hit-from-browser');
+    expect(row.hit_count).toBe(1);
+    expect(row.last_hit_at).toBeTruthy();
+  });
+});
+
+describe('GET /s/:shortSlug — social crawler (OG metadata)', () => {
+  it('returns 200 with OG HTML for WhatsApp UA', async () => {
+    await seedEventAndShortUrl({
+      slug: 'whatsapp-og', shortSlug: 'wa-preview',
+    });
+    const res = await request(app)
+      .get('/s/wa-preview')
+      .set('User-Agent', BOT_UA_WHATSAPP);
+    expect(res.status).toBe(200);
+    expect(res.headers['content-type']).toMatch(/text\/html/);
+    expect(res.text).toContain('<meta');
+    expect(res.text).toMatch(/og:title/);
+    expect(res.text).toMatch(/og:url/);
+  });
+
+  it('og:url canonical points at /s/<slug>, not the underlying gallery URL', async () => {
+    await seedEventAndShortUrl({
+      slug: 'canonical-test', shortSlug: 'canonical-short',
+    });
+    const res = await request(app)
+      .get('/s/canonical-short')
+      .set('User-Agent', BOT_UA_FACEBOOK);
+    expect(res.status).toBe(200);
+    // The og:url meta tag must contain the short-URL path, not the
+    // /gallery/<slug> path — this is the cache-key invariant from #699.
+    expect(res.text).toMatch(/property="og:url"\s+content="[^"]*\/s\/canonical-short"/);
+    expect(res.text).not.toMatch(
+      /property="og:url"\s+content="[^"]*\/gallery\/canonical-test"/
+    );
+  });
+
+  it('sets a short cache header so scrapers can re-fetch when admin rotates the preview', async () => {
+    await seedEventAndShortUrl({
+      slug: 'cache-header', shortSlug: 'cache-test',
+    });
+    const res = await request(app)
+      .get('/s/cache-test')
+      .set('User-Agent', BOT_UA_WHATSAPP);
+    expect(res.headers['cache-control']).toMatch(/public/);
+    expect(res.headers['cache-control']).toMatch(/max-age=300/);
+  });
+
+  it('increments hit_count on a crawler hit as well', async () => {
+    await seedEventAndShortUrl({
+      slug: 'hit-bot', shortSlug: 'hit-from-bot',
+    });
+    await request(app).get('/s/hit-from-bot').set('User-Agent', BOT_UA_WHATSAPP);
+    await new Promise((r) => setTimeout(r, 50));
+    const row = await service.findByShortSlug('hit-from-bot');
+    expect(row.hit_count).toBe(1);
+  });
+});
+
+describe('GET /s/:shortSlug — error states', () => {
+  it('404 for an unknown slug', async () => {
+    const res = await request(app)
+      .get('/s/never-existed')
+      .set('User-Agent', BROWSER_UA);
+    expect(res.status).toBe(404);
+  });
+
+  it('410 for a soft-deleted slug (intentional-delete signal)', async () => {
+    const { shortUrl } = await seedEventAndShortUrl({
+      slug: 'gone-test', shortSlug: 'gone-slug',
+    });
+    await service.softDelete(shortUrl.id, null);
+    const res = await request(app)
+      .get('/s/gone-slug')
+      .set('User-Agent', BROWSER_UA);
+    expect(res.status).toBe(410);
+  });
+
+  it('410 if the event was hard-deleted but the short URL row somehow survives', async () => {
+    const { eventId } = await seedEventAndShortUrl({
+      slug: 'orphan-test', shortSlug: 'orphan-slug',
+    });
+    // Hard-delete the event row (FK CASCADE would normally clean up the
+    // short URL too — but if CASCADE didn't fire for whatever reason
+    // (e.g. SQLite foreign_keys pragma off in a particular runtime), the
+    // resolver should still degrade safely).
+    // SQLite's foreign_keys pragma is OFF by default; the migration
+    // doesn't toggle it, so this delete leaves the short URL row.
+    await db('events').where({ id: eventId }).delete();
+    const res = await request(app)
+      .get('/s/orphan-slug')
+      .set('User-Agent', BOT_UA_WHATSAPP);
+    expect(res.status).toBe(410);
+  });
+
+  it('404 for a malformed slug (rejected at validation, no DB hit)', async () => {
+    const res = await request(app)
+      .get('/s/UPPER_CASE')
+      .set('User-Agent', BROWSER_UA);
+    expect(res.status).toBe(404);
+  });
+});
+
+describe('Regression — existing URL paths must still respond the same', () => {
+  // The /s/* namespace is additive: it must NOT shadow /gallery/*
+  // or any of the OG routes. We don't load the whole app here, but we
+  // can at least pin that the route param doesn't accept slashes —
+  // i.e. /s/foo/bar must NOT be matched by our handler.
+  it('the /s/:shortSlug route does not match nested paths', async () => {
+    const res = await request(app)
+      .get('/s/foo/bar')
+      .set('User-Agent', BROWSER_UA);
+    // Express returns its default 404 when no route matches the path.
+    expect(res.status).toBe(404);
+  });
+});

backend/__tests__/integration/galleryShortUrls.test.js

@@ -0,0 +1,282 @@
+/**
+ * Integration tests for the branded short-URL service (#699).
+ *
+ * Exercises createShortUrl + findByShortSlug + listForEvent + softDelete
+ * + recordHit against a real SQLite DB, including the contracts that
+ * matter for production correctness:
+ *
+ *   - Custom slug + collision detection (409 with `suggested`)
+ *   - Auto-generated slug from event slug + year
+ *   - Soft-delete preserves the row (admin can audit)
+ *   - target_path snapshots at create time (toggling the global
+ *     "Use short gallery URLs" setting later doesn't change existing
+ *     short URLs — backward-compat invariant from #699)
+ *   - hit_count increments idempotently
+ *   - findByShortSlug returns soft-deleted rows (caller decides 410 vs 404)
+ *
+ * Boots one DB for the whole file (cheap on SQLite); each test seeds
+ * its own event row to keep scope clean.
+ */
+const { bootCrmDb } = require('./helpers/crmDb');
+
+jest.setTimeout(60000);
+
+let db; let cleanup; let service; let adminId;
+
+beforeAll(async () => {
+  ({ db, cleanup } = await bootCrmDb());
+
+  // Minimal admin for created_by audit.
+  const adminInsert = await db('admin_users').insert({
+    username: 'shorturl-test',
+    email: '[email protected]',
+    password_hash: 'x',
+    must_change_password: false,
+    created_at: new Date(),
+  }).returning('id');
+  adminId = adminInsert[0]?.id ?? adminInsert[0];
+
+  service = require('../../src/services/galleryShortUrlService');
+}, 120000);
+
+afterAll(async () => { if (cleanup) await cleanup(); });
+
+// Each test seeds a fresh event so collisions / counter state don't leak.
+async function seedEvent(overrides = {}) {
+  const slug = overrides.slug || `evt-${Date.now()}-${Math.random().toString(36).slice(2, 6)}`;
+  const farFuture = new Date(Date.now() + 365 * 86400000).toISOString();
+  const [id] = await db('events').insert({
+    slug,
+    event_type: 'wedding',
+    event_name: overrides.event_name || 'Test Wedding',
+    event_date: overrides.event_date || '2026-06-05',
+    password_hash: 'x',
+    expires_at: farFuture,
+    is_active: true,
+    is_archived: false,
+    share_link: slug,
+    share_token: overrides.share_token || `tok${Math.random().toString(36).slice(2, 12)}`,
+    welcome_message: null,
+  });
+  const event = await db('events').where({ id }).first();
+  return event;
+}
+
+describe('createShortUrl — custom slug', () => {
+  it('creates with a custom slug', async () => {
+    const event = await seedEvent({ slug: 'sofia-grad-1' });
+    const row = await service.createShortUrl({
+      eventId: event.id,
+      customSlug: 'sofia-graduation-1',
+      createdBy: adminId,
+    });
+    expect(row.short_slug).toBe('sofia-graduation-1');
+    expect(row.target_path).toBe(`/gallery/${event.slug}`);
+    expect(row.event_id).toBe(event.id);
+    expect(row.hit_count).toBe(0);
+  });
+
+  it('lowercases the input — operators pasting mixed-case still get a clean slug', async () => {
+    const event = await seedEvent({ slug: 'sofia-grad-2' });
+    const row = await service.createShortUrl({
+      eventId: event.id,
+      customSlug: 'Sofia-GraduAtion-2',  // mixed case
+      createdBy: adminId,
+    });
+    expect(row.short_slug).toBe('sofia-graduation-2');
+  });
+
+  it('rejects an invalid slug with INVALID_SLUG code', async () => {
+    const event = await seedEvent({ slug: 'invalid-test' });
+    await expect(service.createShortUrl({
+      eventId: event.id,
+      customSlug: 'invalid slug with spaces',
+      createdBy: adminId,
+    })).rejects.toMatchObject({ code: 'INVALID_SLUG' });
+  });
+
+  it('rejects a reserved slug with INVALID_SLUG code', async () => {
+    const event = await seedEvent({ slug: 'reserved-test' });
+    await expect(service.createShortUrl({
+      eventId: event.id,
+      customSlug: 'admin',
+      createdBy: adminId,
+    })).rejects.toMatchObject({ code: 'INVALID_SLUG' });
+  });
+
+  it('rejects a duplicate slug with SLUG_TAKEN + suggested fallback', async () => {
+    const event1 = await seedEvent({ slug: 'dup-test-1' });
+    const event2 = await seedEvent({ slug: 'dup-test-2' });
+    await service.createShortUrl({ eventId: event1.id, customSlug: 'collide-me' });
+    await expect(service.createShortUrl({
+      eventId: event2.id, customSlug: 'collide-me',
+    })).rejects.toMatchObject({
+      code: 'SLUG_TAKEN',
+      suggested: expect.any(String),
+    });
+  });
+
+  it('throws EVENT_NOT_FOUND when the event id does not exist', async () => {
+    await expect(service.createShortUrl({
+      eventId: 9999999, customSlug: 'no-event',
+    })).rejects.toMatchObject({ code: 'EVENT_NOT_FOUND' });
+  });
+});
+
+describe('createShortUrl — auto-generated slug', () => {
+  it('uses event slug + year when no custom slug provided', async () => {
+    const event = await seedEvent({
+      slug: 'autogen-wedding', event_date: '2026-06-05',
+    });
+    const row = await service.createShortUrl({
+      eventId: event.id,
+      createdBy: adminId,
+    });
+    // First-choice candidate is just the slug; takes that.
+    expect(row.short_slug).toBe('autogen-wedding');
+  });
+
+  it('falls back to slug-year when the bare slug is already taken', async () => {
+    // Both events SHARE the same canonical slug so the first-choice
+    // bare-slug candidate is burned, forcing autoGen to try the
+    // year-suffixed variant.
+    const event1 = await seedEvent({
+      slug: 'collide-base', event_date: '2026-07-01',
+    });
+    await service.createShortUrl({
+      eventId: event1.id, customSlug: 'collide-base',
+    });
+    const event2 = await seedEvent({
+      slug: 'collide-base-2', event_date: '2026-07-01',
+    });
+    // Force the bare candidate of event2 to also collide by burning it.
+    await service.createShortUrl({
+      eventId: event1.id, customSlug: 'collide-base-2',
+    });
+    const row = await service.createShortUrl({
+      eventId: event2.id,  // No custom — auto-gen from event2.slug
+    });
+    // Bare candidate `collide-base-2` is taken → year-suffixed picks.
+    expect(row.short_slug).toBe('collide-base-2-2026');
+  });
+});
+
+describe('createShortUrl — target_path snapshotting (#699 backward-compat)', () => {
+  it('uses /gallery/<slug> when the global short-URLs setting is OFF (default)', async () => {
+    const event = await seedEvent({ slug: 'snapshot-off' });
+    const row = await service.createShortUrl({
+      eventId: event.id, customSlug: 'snap-off',
+    });
+    expect(row.target_path).toBe(`/gallery/${event.slug}`);
+  });
+
+  it('uses /gallery/<share_token> when the global setting is ON at create time', async () => {
+    // Persist the setting.
+    const { upsertAppSetting } = require('../../src/utils/appSettings');
+    await upsertAppSetting('general_use_short_gallery_urls', JSON.stringify(true), 'system');
+    try {
+      const event = await seedEvent({ slug: 'snapshot-on', share_token: 'tokenAbc123' });
+      const row = await service.createShortUrl({
+        eventId: event.id, customSlug: 'snap-on',
+      });
+      expect(row.target_path).toBe(`/gallery/${event.share_token}`);
+
+      // CRITICAL backward-compat invariant: now flip the setting OFF.
+      // Existing short URLs must still resolve to the same target_path
+      // they were created with — operator's existing share links don't
+      // silently change behaviour.
+      await upsertAppSetting('general_use_short_gallery_urls', JSON.stringify(false), 'system');
+      const refetched = await service.findByShortSlug('snap-on');
+      expect(refetched.target_path).toBe(`/gallery/${event.share_token}`);
+    } finally {
+      await upsertAppSetting('general_use_short_gallery_urls', JSON.stringify(false), 'system');
+    }
+  });
+});
+
+describe('findByShortSlug + listForEvent', () => {
+  it('returns null for an unknown slug', async () => {
+    expect(await service.findByShortSlug('does-not-exist-xyz')).toBeNull();
+  });
+
+  it('returns null for a malformed slug (no DB hit)', async () => {
+    expect(await service.findByShortSlug('UPPER_CASE')).toBeNull();
+    expect(await service.findByShortSlug('with spaces')).toBeNull();
+    expect(await service.findByShortSlug('')).toBeNull();
+  });
+
+  it('returns soft-deleted rows (caller decides 410 vs 404)', async () => {
+    const event = await seedEvent({ slug: 'softdel-find' });
+    const created = await service.createShortUrl({
+      eventId: event.id, customSlug: 'find-deleted',
+    });
+    await service.softDelete(created.id, adminId);
+    const fetched = await service.findByShortSlug('find-deleted');
+    expect(fetched).not.toBeNull();
+    expect(fetched.deleted_at).toBeTruthy();
+  });
+
+  it('listForEvent excludes soft-deleted rows', async () => {
+    const event = await seedEvent({ slug: 'list-test' });
+    const live = await service.createShortUrl({
+      eventId: event.id, customSlug: 'list-live',
+    });
+    const deleted = await service.createShortUrl({
+      eventId: event.id, customSlug: 'list-deleted',
+    });
+    await service.softDelete(deleted.id, adminId);
+    const list = await service.listForEvent(event.id);
+    const ids = list.map((r) => r.id);
+    expect(ids).toContain(live.id);
+    expect(ids).not.toContain(deleted.id);
+  });
+});
+
+describe('softDelete', () => {
+  it('returns true on first call, false on second (idempotent admin clicks)', async () => {
+    const event = await seedEvent({ slug: 'softdel-idem' });
+    const created = await service.createShortUrl({
+      eventId: event.id, customSlug: 'idem-delete',
+    });
+    expect(await service.softDelete(created.id, adminId)).toBe(true);
+    expect(await service.softDelete(created.id, adminId)).toBe(false);
+  });
+
+  it('returns false for an unknown id (caller maps to 404)', async () => {
+    expect(await service.softDelete(9999999, adminId)).toBe(false);
+  });
+});
+
+describe('createShortUrl after soft-delete — slug rotation', () => {
+  it('re-creating a soft-deleted slug succeeds (purges the deleted row)', async () => {
+    const event = await seedEvent({ slug: 'rotate' });
+    const first = await service.createShortUrl({
+      eventId: event.id, customSlug: 'rotate-me',
+    });
+    await service.softDelete(first.id, adminId);
+    // The slug is now reclaimable for a fresh row.
+    const second = await service.createShortUrl({
+      eventId: event.id, customSlug: 'rotate-me',
+    });
+    expect(second.id).not.toBe(first.id);
+    expect(second.short_slug).toBe('rotate-me');
+  });
+});
+
+describe('recordHit', () => {
+  it('increments hit_count + stamps last_hit_at', async () => {
+    const event = await seedEvent({ slug: 'hit-counter' });
+    const row = await service.createShortUrl({
+      eventId: event.id, customSlug: 'count-me',
+    });
+    await service.recordHit(row.id);
+    await service.recordHit(row.id);
+    const fetched = await service.findByShortSlug('count-me');
+    expect(fetched.hit_count).toBe(2);
+    expect(fetched.last_hit_at).toBeTruthy();
+  });
+
+  it('is fire-and-forget — invalid id does not throw', async () => {
+    await expect(service.recordHit(9999999)).resolves.not.toThrow();
+  });
+});