feat(push): M7 backend — opt-in push notifications via self-hosted ntfy

Additive, v1-only backend contract for the Android app's opt-in push (Part 1 of
M7; docs/android/PLAN.md §11). The app is a pure consumer — this lands the
endpoints, fan-out, and relay it needs.

- Schema: push_devices (per-device endpoint) + notification_subscriptions
  (per-user opted-in streams), FK→users ON DELETE CASCADE.
- Stream catalog + event→stream mapping (config/notificationStreams.js): public
  streams (news.post, server.status, idoc.warning, champ.start, governor.election)
  drawn ONLY from the SSE PUBLIC_KINDS allowlist; personal owner-keyed streams
  (vendor.sale, house.idoc, account.login). Full-state upserts (champ/city) fire
  only on a real transition via an injectable tracker.
- Fan-out (utils/pushDispatch.js): content-free tickles ({ stream, ref }) POSTed
  to each subscribed device; never throws. Two producers — shardIngest.ingest
  (beside the SSE broadcast) and the create/publish-post path (news.post).
  Personal events resolve to the owner via shardLinks. SSRF guard: endpoints must
  be HTTPS, non-private, and on the NTFY_BASE_URL/NTFY_ALLOWED_ORIGINS allow-set —
  enforced at registration and every publish.
- Routes under the role-agnostic self surface (never /admin): POST|GET
  /auth/me/devices, DELETE /auth/me/devices/:id, GET
  /auth/me/notifications/streams, GET|PUT /auth/me/notifications/subscriptions.
  Swagger regenerated (4 paths, PushDevice/NotificationStreams/etc. schemas).
- ntfy service in docker-compose.yml: pinned image, declarative ./ntfy/server.yml,
  no published host port, anonymous unguessable topics (no accounts) — zero
  interactive setup. No publish token required (content-free design); optional
  NTFY_PUBLISH_TOKEN honored.
- Tests: pushDispatch (mapping, PUBLIC_KINDS gate, owner-keying, SSRF guard,
  content-free payload) + notifications route auth gate. Full suite green (247).

Co-Authored-By: Claude <noreply@anthropic.com>

server/src/config/notificationStreams.js

@@ -0,0 +1,167 @@
+// ── Push-notification stream catalog + event → stream mapping ───────────────
+//
+// The single source of truth for which streams a user can subscribe to, and how
+// a shard event maps onto them. Two families:
+//   • public / opt-in    — no linked game account required; delivered to every
+//                           subscriber. Drawn ONLY from the SSE public allowlist
+//                           (utils/shardBroadcast PUBLIC_KINDS) — a sensitive kind
+//                           can never produce a public push.
+//   • personal / owner-keyed — require a linked game account; delivered ONLY to
+//                           the owning user's devices (resolved from the event's
+//                           game account via shardLinks), never fanned out publicly.
+//
+// The payload the relay ever carries is a CONTENT-FREE tickle ({ stream, ref });
+// `ref` is an opaque hint (serial / city / timestamp) the app uses to pull the
+// real, ownership-checked content over the authenticated API. So even a leaked
+// ntfy topic reveals nothing (docs/android/PLAN.md §11).
+
+const { PUBLIC_KINDS } = require('../utils/shardBroadcast')
+
+// The subscribable catalog. `news.post` is produced by the website's own posts
+// path (not the shard feed) — see utils/pushDispatch — so it has no mapShardEvent
+// case; every other stream is shard-derived below.
+const STREAMS = [
+  {
+    id: 'news.post',
+    label: 'News posts',
+    description: 'New news / Five-on-Friday / newsletter posts.',
+    personal: false,
+    requiresLinkedAccount: false,
+  },
+  {
+    id: 'server.status',
+    label: 'Server up / down',
+    description: 'The shard comes online or goes offline.',
+    personal: false,
+    requiresLinkedAccount: false,
+  },
+  {
+    id: 'idoc.warning',
+    label: 'IDOC warnings',
+    description: 'A house falls into its final (IDOC) decay stage.',
+    personal: false,
+    requiresLinkedAccount: false,
+  },
+  {
+    id: 'champ.start',
+    label: 'Champion spawn starts',
+    description: 'A champion spawn becomes active.',
+    personal: false,
+    requiresLinkedAccount: false,
+  },
+  {
+    id: 'governor.election',
+    label: 'Governor elections',
+    description: 'A town elects a new governor.',
+    personal: false,
+    requiresLinkedAccount: false,
+  },
+  {
+    id: 'vendor.sale',
+    label: 'Your vendor sold an item',
+    description: 'One of your player vendors made a sale.',
+    personal: true,
+    requiresLinkedAccount: true,
+  },
+  {
+    id: 'house.idoc',
+    label: 'Your house entered IDOC',
+    description: 'One of your houses fell into its final decay stage.',
+    personal: true,
+    requiresLinkedAccount: true,
+  },
+  {
+    id: 'account.login',
+    label: 'A login to your account',
+    description: 'An authentication attempt against your game account.',
+    personal: true,
+    requiresLinkedAccount: true,
+  },
+]
+
+const STREAM_IDS = new Set(STREAMS.map((s) => s.id))
+const isValidStream = (id) => STREAM_IDS.has(id)
+const PERSONAL_STREAMS = new Set(STREAMS.filter((s) => s.personal).map((s) => s.id))
+
+// Per-process transition state so full-state upserts (champ.update / city.update
+// are upserts, not discrete "started"/"elected" events — see docs/link
+// PROTOCOL_2 §383) only fire once, on an actual transition. Injectable so tests
+// pass a fresh tracker; a module-level default backs the live dispatcher.
+function createTracker() {
+  return { champActive: new Map(), cityGovernor: new Map() }
+}
+const defaultTracker = createTracker()
+
+// Map one shard event → an array of targets ({ streamId, ref, ownerAccount? }).
+// May yield 0, 1, or 2 targets (an owner house.decay produces both the public
+// idoc.warning and the personal house.idoc). Pure given `tracker`.
+function mapShardEvent(event, tracker = defaultTracker) {
+  if (!event || typeof event.kind !== 'string') return []
+  const kind = event.kind
+  const out = []
+
+  switch (kind) {
+    case 'server.hello':
+      out.push({ streamId: 'server.status', ref: `up:${event.bootId || ''}` })
+      break
+    case 'server.shutdown':
+    case 'server.crashed':
+      out.push({ streamId: 'server.status', ref: 'down' })
+      break
+    case 'house.decay': {
+      if (String(event.to).toUpperCase() !== 'IDOC') break
+      const ref = String(event.serial ?? '')
+      out.push({ streamId: 'idoc.warning', ref }) // public — location only
+      if (event.ownerAcct) {
+        out.push({ streamId: 'house.idoc', ref, ownerAccount: event.ownerAcct }) // personal
+      }
+      break
+    }
+    case 'champ.update': {
+      const { serial } = event
+      if (serial == null) break
+      const wasActive = tracker.champActive.get(serial) === true
+      const isActive = event.active === true
+      tracker.champActive.set(serial, isActive)
+      if (isActive && !wasActive) out.push({ streamId: 'champ.start', ref: String(serial) })
+      break
+    }
+    case 'champ.remove':
+      if (event.serial != null) tracker.champActive.delete(event.serial)
+      break
+    case 'city.update': {
+      const { city } = event
+      if (!city) break
+      const gov = event.governor && event.governor.serial != null ? String(event.governor.serial) : null
+      const prev = tracker.cityGovernor.get(city)
+      tracker.cityGovernor.set(city, gov)
+      // Only a real transition to a new governor, and never on first sight
+      // (prev === undefined) so a reconnect snapshot isn't read as an election.
+      if (prev !== undefined && gov && gov !== prev) {
+        out.push({ streamId: 'governor.election', ref: String(city) })
+      }
+      break
+    }
+    case 'vendor.sale':
+      if (event.ownerAcct) {
+        out.push({ streamId: 'vendor.sale', ref: String(event.t ?? ''), ownerAccount: event.ownerAcct })
+      }
+      break
+    case 'account.login.attempt':
+      if (event.acct) {
+        out.push({ streamId: 'account.login', ref: String(event.t ?? ''), ownerAccount: event.acct })
+      }
+      break
+    default:
+      break
+  }
+
+  // Defense in depth: a PUBLIC (non-personal) target may only ride a public-safe
+  // kind. Personal targets are owner-keyed and delivered solely to the owner, so
+  // they are exempt from the public allowlist (that is the whole point of the
+  // owner-keyed split). This guarantees a sensitive kind can never leak publicly
+  // even if a future mapping case is added carelessly.
+  return out.filter((t) => (PERSONAL_STREAMS.has(t.streamId) ? true : PUBLIC_KINDS.has(kind)))
+}
+
+module.exports = { STREAMS, isValidStream, mapShardEvent, createTracker, PERSONAL_STREAMS }

server/src/model/notificationSubs/notificationSubs.db.js

@@ -0,0 +1,16 @@
+const { query } = require('../../utils/db')
+
+const listByUser = (userId) =>
+  query('SELECT stream_id FROM notification_subscriptions WHERE user_id = ? ORDER BY stream_id', [userId])
+
+// Replace the user's whole subscription set in one transaction-ish pass: delete
+// all, then insert the new set. Called by PUT — the request body is the complete
+// desired set. `streams` is already validated against the catalog by the model.
+async function replaceForUser(userId, streams) {
+  await query('DELETE FROM notification_subscriptions WHERE user_id = ?', [userId])
+  for (const streamId of streams) {
+    await query('INSERT INTO notification_subscriptions (user_id, stream_id) VALUES (?, ?)', [userId, streamId])
+  }
+}
+
+module.exports = { listByUser, replaceForUser }

server/src/model/notificationSubs/notificationSubs.model.js

@@ -0,0 +1,18 @@
+// Per-user push-notification subscriptions (which streams a user opted into;
+// applied to every device they register). The catalog is config/notificationStreams.
+
+const db = require('./notificationSubs.db')
+const { isValidStream } = require('../../config/notificationStreams')
+
+const getForUser = async (userId) => (await db.listByUser(userId)).map((r) => r.stream_id)
+
+// Replace the user's subscription set. Ignores unknown ids and de-dupes, so a
+// stale client can't create rows for streams that no longer exist. Returns the
+// stored (cleaned) set.
+async function setForUser(userId, streams) {
+  const clean = [...new Set((Array.isArray(streams) ? streams : []).filter(isValidStream))]
+  await db.replaceForUser(userId, clean)
+  return clean
+}
+
+module.exports = { getForUser, setForUser }

server/src/model/pushDevices/pushDevices.db.js

@@ -0,0 +1,51 @@
+const { query } = require('../../utils/db')
+
+const COLS = 'id, user_id, transport, endpoint, platform, created_at, last_seen_at'
+
+// Register (idempotent upsert on the UNIQUE user_id+endpoint). Re-registering the
+// same endpoint refreshes transport/platform and bumps last_seen_at.
+async function upsert({ userId, transport, endpoint, platform }) {
+  await query(
+    `INSERT INTO push_devices (user_id, transport, endpoint, platform)
+     VALUES (?, ?, ?, ?)
+     ON DUPLICATE KEY UPDATE transport = VALUES(transport), platform = VALUES(platform), last_seen_at = CURRENT_TIMESTAMP`,
+    [userId, transport, endpoint, platform || null],
+  )
+  return getByUserEndpoint(userId, endpoint)
+}
+
+async function getByUserEndpoint(userId, endpoint) {
+  const rows = await query(`SELECT ${COLS} FROM push_devices WHERE user_id = ? AND endpoint = ? LIMIT 1`, [userId, endpoint])
+  return rows[0] || null
+}
+
+const listByUser = (userId) =>
+  query(`SELECT ${COLS} FROM push_devices WHERE user_id = ? ORDER BY created_at DESC`, [userId])
+
+async function remove(id, userId) {
+  const res = await query('DELETE FROM push_devices WHERE id = ? AND user_id = ?', [id, userId])
+  return Number(res.affectedRows || 0)
+}
+
+// Endpoints of every device whose user subscribes to `streamId` (public fan-out).
+const endpointsForStream = (streamId) =>
+  query(
+    `SELECT d.endpoint, d.transport
+       FROM push_devices d
+       JOIN notification_subscriptions s ON s.user_id = d.user_id
+      WHERE s.stream_id = ?`,
+    [streamId],
+  )
+
+// Endpoints of ONE user's devices, only if that user subscribes to `streamId`
+// (personal / owner-keyed fan-out).
+const endpointsForUserStream = (userId, streamId) =>
+  query(
+    `SELECT d.endpoint, d.transport
+       FROM push_devices d
+       JOIN notification_subscriptions s ON s.user_id = d.user_id
+      WHERE d.user_id = ? AND s.stream_id = ?`,
+    [userId, streamId],
+  )
+
+module.exports = { upsert, getByUserEndpoint, listByUser, remove, endpointsForStream, endpointsForUserStream }

server/src/model/pushDevices/pushDevices.model.js

@@ -0,0 +1,32 @@
+// Registered push endpoints (Android/UnifiedPush v1). A device belongs to one
+// user; the endpoint is the distributor URL the app's ntfy topic was handed. The
+// endpoint is validated (HTTPS + allowed origin) by utils/pushDispatch before it
+// is ever stored or published to — see that module's isAllowedEndpoint.
+
+const db = require('./pushDevices.db')
+
+function toSafe(row) {
+  if (!row) return null
+  return {
+    id: row.id,
+    transport: row.transport,
+    endpoint: row.endpoint,
+    platform: row.platform || null,
+    createdAt: row.created_at,
+    lastSeenAt: row.last_seen_at,
+  }
+}
+
+const register = async ({ userId, transport, endpoint, platform }) =>
+  toSafe(await db.upsert({ userId, transport, endpoint, platform }))
+
+const listForUser = async (userId) => (await db.listByUser(userId)).map(toSafe)
+
+// Returns true if a row was deleted (the device existed and belonged to userId).
+const remove = async (id, userId) => (await db.remove(id, userId)) > 0
+
+// Fan-out helpers: raw { endpoint, transport } rows (not toSafe-shaped).
+const endpointsForStream = (streamId) => db.endpointsForStream(streamId)
+const endpointsForUserStream = (userId, streamId) => db.endpointsForUserStream(userId, streamId)
+
+module.exports = { register, listForUser, remove, endpointsForStream, endpointsForUserStream }

server/src/router/v1/admin/admin.controller.js

@@ -5,6 +5,7 @@ const users = require('../../../model/users/users.model')
 const activity = require('../../../model/activity/activity.model')
 const announceJobs = require('../../../model/announceJobs/announceJobs.model')
 const newsGump = require('../../../utils/newsGump')
+const pushDispatch = require('../../../utils/pushDispatch')
 const { cleanBody } = require('../../../utils/sanitizeHtml')
 
 const log = require('../../../utils/logger')('admin')
@@ -22,12 +23,23 @@ const log = require('../../../utils/logger')('admin')
 // (post.announce_job_id) reliable against rapid double-publishes. Still guarded:
 // enqueueIfNeeded swallows its own errors, so a pipeline hiccup can't break save.
 async function announceIfNewlyPublished(post, transition) {
-  await announceJobs.enqueueIfNeeded(post, transition)
+  // enqueueIfNeeded returns a truthy job id EXACTLY on a real transition into
+  // published news (and null on an edit/re-publish or a hiccup) — reuse that as
+  // the single "newly published news" signal for the push too, so we never
+  // double-fire on edits or replicate the transition logic.
+  const jobId = await announceJobs.enqueueIfNeeded(post, transition)
   // Keep the in-game Town Cryer News gump in sync with the same transition: push
   // the article when it becomes published news, refresh it silently on an edit,
   // and pull it when it leaves published-news. Best-effort (never throws), so a
   // sidecar hiccup never breaks saving a post — same guarantee as the enqueue.
   await newsGump.syncPost(post, transition)
+  // Opt-in push tickle to news.post subscribers, on the same transition.
+  // Fire-and-forget + self-guarding, so a dead ntfy relay never breaks saving.
+  if (jobId) {
+    Promise.resolve(pushDispatch.publish('news.post', { ref: String(post.id) })).catch((err) =>
+      log.warn('news push failed', { postId: post.id, message: err.message }),
+    )
+  }
 }
 
 // ── Dashboard & site mode ─────────────────────────────────────────────

server/src/router/v1/auth/auth.routes.js

@@ -17,6 +17,7 @@ const validate = require('../../../middleware/validate')
 const mobileRouter = require('./mobile.routes')
 const ssoRouter = require('./sso.routes')
 const meRouter = require('./me.routes')
+const notifRouter = require('./notifications.routes')
 
 const authRouter = express.Router()
 
@@ -34,6 +35,11 @@ authRouter.use(ssoRouter)
 // free route, so /me falls through to its own handler).
 authRouter.use('/me', meRouter)
 
+// Push-notification self-service — /auth/me/devices*, /auth/me/notifications/*.
+// A second sub-router at /me (Express allows multiple), same requireAuth gate,
+// keeping the notification surface separate from the account/identity handlers.
+authRouter.use('/me', notifRouter)
+
 // Login protection order (cheapest rejection first):
 //   backoffGuard → per-IP exponential lockout on repeated failures
 //   slowLogin    → progressive per-request delay within the window

server/src/router/v1/auth/notifications.controller.js

@@ -0,0 +1,86 @@
+// Self-service push-notification management for the logged-in user (any role).
+// Mounted under /auth/me behind requireAuth, so req.user is the fresh DB row.
+// Devices (endpoints) and stream subscriptions live here; the fan-out that
+// actually delivers is utils/pushDispatch. See docs/android/PLAN.md §11.
+
+const pushDevices = require('../../../model/pushDevices/pushDevices.model')
+const notificationSubs = require('../../../model/notificationSubs/notificationSubs.model')
+const { STREAMS } = require('../../../config/notificationStreams')
+const { isAllowedEndpoint } = require('../../../utils/pushDispatch')
+
+const log = require('../../../utils/logger')('notifications')
+
+// POST /auth/me/devices — register (or refresh) a push endpoint for this user.
+async function registerDevice(req, res) {
+  const { transport = 'unifiedpush', endpoint, platform } = req.body
+  // SSRF guard: the endpoint is a URL the server will later POST to. Reject
+  // anything that isn't an allowed HTTPS relay origin before storing it.
+  if (!isAllowedEndpoint(endpoint)) {
+    return res.status(400).json({ message: 'Endpoint is not an allowed push URL' })
+  }
+  try {
+    const device = await pushDevices.register({ userId: req.user.id, transport, endpoint, platform })
+    return res.status(201).json(device)
+  } catch (err) {
+    log.error('registerDevice', err)
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// GET /auth/me/devices — this user's registered devices.
+async function listDevices(req, res) {
+  try {
+    return res.json(await pushDevices.listForUser(req.user.id))
+  } catch (err) {
+    log.error('listDevices', err)
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// DELETE /auth/me/devices/:id — unregister a device (must belong to the caller).
+async function removeDevice(req, res) {
+  try {
+    const ok = await pushDevices.remove(Number(req.params.id), req.user.id)
+    if (!ok) return res.status(404).json({ message: 'Not found' })
+    return res.json({ ok: true })
+  } catch (err) {
+    log.error('removeDevice', err)
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// GET /auth/me/notifications/streams — the subscribable catalog (static).
+function getStreams(req, res) {
+  return res.json({ streams: STREAMS })
+}
+
+// GET /auth/me/notifications/subscriptions — the caller's opted-in stream ids.
+async function getSubscriptions(req, res) {
+  try {
+    return res.json({ streams: await notificationSubs.getForUser(req.user.id) })
+  } catch (err) {
+    log.error('getSubscriptions', err)
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+// PUT /auth/me/notifications/subscriptions — replace the caller's stream set.
+// Unknown ids are dropped; the stored (cleaned) set is echoed back.
+async function putSubscriptions(req, res) {
+  try {
+    const streams = await notificationSubs.setForUser(req.user.id, req.body.streams)
+    return res.json({ streams })
+  } catch (err) {
+    log.error('putSubscriptions', err)
+    return res.status(500).json({ message: 'Internal Server Error' })
+  }
+}
+
+module.exports = {
+  registerDevice,
+  listDevices,
+  removeDevice,
+  getStreams,
+  getSubscriptions,
+  putSubscriptions,
+}

server/src/router/v1/auth/notifications.routes.js

@@ -0,0 +1,100 @@
+// ── Push-notification self-service under /auth/me ──────────────────────────
+//
+// Device registration + per-user stream subscriptions for the app's opt-in push
+// (docs/android/PLAN.md §11). Mounted at /me by auth.routes.js alongside
+// me.routes.js, behind requireAuth ONLY (role-agnostic — every authenticated
+// role manages its own devices/subscriptions), and noindex. The app calls these
+// and never touches /admin.
+
+const express = require('express')
+const { body, param } = require('express-validator')
+
+const notif = require('./notifications.controller')
+const { requireAuth } = require('../../../auth/session.middleware')
+const noindex = require('../../../middleware/noindex')
+const validate = require('../../../middleware/validate')
+
+const notifRouter = express.Router()
+
+notifRouter.use(noindex, requireAuth)
+
+// ── Devices ────────────────────────────────────────────────────────────────
+notifRouter.post(
+  '/devices',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'Register a push device (endpoint) for the current user'
+  // #swagger.description = 'Registers a UnifiedPush/ntfy endpoint (or an FCM token) so the backend can deliver opt-in push tickles. The endpoint must be an allowed HTTPS relay URL — private/loopback hosts and non-allowed origins are rejected 400. Idempotent per (user, endpoint).'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.requestBody = { required: true, content: { "application/json": { schema: { $ref: "#/components/schemas/RegisterDeviceRequest" } } } } */
+  /* #swagger.responses[201] = { description: 'Device registered', content: { "application/json": { schema: { $ref: "#/components/schemas/PushDevice" } } } } */
+  /* #swagger.responses[400] = { description: 'Validation error or disallowed endpoint', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  body('endpoint').isString().trim().isURL({ protocols: ['https'], require_protocol: true }).isLength({ max: 512 }),
+  body('transport').optional().isIn(['unifiedpush', 'fcm']),
+  body('platform').optional({ values: 'falsy' }).isString().isLength({ max: 40 }),
+  validate,
+  notif.registerDevice,
+)
+
+notifRouter.get(
+  '/devices',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'List the current user’s registered push devices'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Registered devices', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/PushDevice" } } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  notif.listDevices,
+)
+
+notifRouter.delete(
+  '/devices/:id',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'Unregister a push device'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  // #swagger.parameters['id'] = { in: 'path', required: true, schema: { type: 'integer' }, description: 'Device id (must belong to the caller).' }
+  /* #swagger.responses[200] = { description: 'Unregistered', content: { "application/json": { schema: { $ref: "#/components/schemas/OkFlag" } } } } */
+  /* #swagger.responses[404] = { description: 'No such device for this user', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  param('id').isInt({ min: 1 }),
+  validate,
+  notif.removeDevice,
+)
+
+// ── Streams catalog + subscriptions ─────────────────────────────────────────
+notifRouter.get(
+  '/notifications/streams',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'List subscribable notification streams (catalog)'
+  // #swagger.description = 'The catalog of push streams. `personal`/`requiresLinkedAccount` streams are delivered only to the owning user and need a linked game account.'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Stream catalog', content: { "application/json": { schema: { $ref: "#/components/schemas/NotificationStreams" } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  notif.getStreams,
+)
+
+notifRouter.get(
+  '/notifications/subscriptions',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'Get the current user’s notification subscriptions'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Subscribed stream ids', content: { "application/json": { schema: { $ref: "#/components/schemas/NotificationSubscriptions" } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  notif.getSubscriptions,
+)
+
+notifRouter.put(
+  '/notifications/subscriptions',
+  // #swagger.tags = ['Auth · Me']
+  // #swagger.summary = 'Replace the current user’s notification subscriptions'
+  // #swagger.description = 'Sets the full opted-in stream set (applied to all the user’s devices). Unknown stream ids are ignored; the stored set is echoed back.'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.requestBody = { required: true, content: { "application/json": { schema: { $ref: "#/components/schemas/NotificationSubscriptions" } } } } */
+  /* #swagger.responses[200] = { description: 'Updated subscriptions', content: { "application/json": { schema: { $ref: "#/components/schemas/NotificationSubscriptions" } } } } */
+  /* #swagger.responses[400] = { description: 'Validation error', content: { "application/json": { schema: { $ref: "#/components/schemas/ValidationError" } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  body('streams').isArray(),
+  body('streams.*').isString().isLength({ max: 64 }),
+  validate,
+  notif.putSubscriptions,
+)
+
+module.exports = notifRouter

server/src/utils/pushDispatch.js

@@ -0,0 +1,135 @@
+// ── Push-notification fan-out (content-free tickles) ───────────────────────
+//
+// The transport-agnostic publisher that turns an event into opt-in push
+// notifications. Two producers call in:
+//   • utils/shardIngest.js  → fromShardEvent(event) for shard-derived streams
+//     (beside the existing SSE broadcast — same event source, same allowlist).
+//   • the admin create/publish-post path → publish('news.post', …).
+//
+// What actually leaves the server is a CONTENT-FREE tickle — `{ stream, ref }`,
+// no sensitive data — POSTed to each subscribed device's UnifiedPush/ntfy
+// endpoint. The app wakes and PULLS the real content over the authenticated,
+// ownership-checked API. So ntfy is treated as an untrusted relay: a leaked topic
+// reveals nothing, which is what lets it run with no per-user accounts
+// (docs/android/PLAN.md §11).
+//
+// SECURITY: a device `endpoint` is a client-supplied URL the server makes
+// server-side POSTs to — a classic SSRF vector. isAllowedEndpoint() gates every
+// registration AND every publish: HTTPS only, never a private/loopback host, and
+// (when configured) the origin must be in the shard's ntfy allow-set.
+
+const shardLinks = require('../model/shardLinks/shardLinks.model')
+const pushDevicesModel = require('../model/pushDevices/pushDevices.model')
+const { mapShardEvent } = require('../config/notificationStreams')
+const log = require('./logger')('push-dispatch')
+
+const TIMEOUT_MS = 5000
+
+// Hosts that must never be POSTed to, even if the allow-set is empty (dev). This
+// is a coarse literal check (no DNS resolution) — the real protection in prod is
+// the configured allow-set below, which pins the single ntfy origin.
+const PRIVATE_HOST =
+  /^(localhost|127\.|0\.0\.0\.0|10\.|192\.168\.|169\.254\.|::1|fc00:|fd00:|172\.(1[6-9]|2\d|3[01])\.)/i
+
+function toOrigin(u) {
+  try {
+    return new URL(u).origin
+  } catch {
+    return null
+  }
+}
+
+// Allowed publish origins, from NTFY_ALLOWED_ORIGINS (comma-separated) or, failing
+// that, NTFY_BASE_URL's origin. Empty when neither is set (dev fallback).
+function allowedOrigins() {
+  const raw = process.env.NTFY_ALLOWED_ORIGINS || process.env.NTFY_BASE_URL || ''
+  return raw
+    .split(',')
+    .map((s) => toOrigin(s.trim()))
+    .filter(Boolean)
+}
+
+// Is this endpoint safe to POST to? HTTPS + non-private host + (if an allow-set is
+// configured) an allowed origin. With no allow-set (dev), any public HTTPS host is
+// permitted; the private-host check still blocks the obvious SSRF targets.
+function isAllowedEndpoint(endpoint) {
+  let url
+  try {
+    url = new URL(String(endpoint))
+  } catch {
+    return false
+  }
+  if (url.protocol !== 'https:') return false
+  if (PRIVATE_HOST.test(url.hostname)) return false
+  const allow = allowedOrigins()
+  if (allow.length === 0) return true
+  return allow.includes(url.origin)
+}
+
+async function postTickle(endpoint, bodyStr, deps) {
+  const doFetch = deps.fetchImpl || fetch
+  if (!isAllowedEndpoint(endpoint)) {
+    log.warn('skipping push to disallowed endpoint', { endpoint })
+    return
+  }
+  const controller = new AbortController()
+  const timeout = setTimeout(() => controller.abort(), TIMEOUT_MS)
+  try {
+    const headers = { 'Content-Type': 'application/json' }
+    const token = process.env.NTFY_PUBLISH_TOKEN
+    if (token) headers.Authorization = `Bearer ${token}`
+    await doFetch(endpoint, { method: 'POST', headers, body: bodyStr, signal: controller.signal })
+  } catch (err) {
+    log.warn('push tickle failed', { message: err.message })
+  } finally {
+    clearTimeout(timeout)
+  }
+}
+
+// Publish one content-free tickle. Public (ownerUserId absent) → every device
+// whose user subscribes to the stream. Personal (ownerUserId set) → only that
+// user's devices, and only if subscribed. Never throws.
+async function publish(streamId, { ref, ownerUserId } = {}, deps = {}) {
+  const devices = deps.pushDevices || pushDevicesModel
+  let rows
+  try {
+    rows =
+      ownerUserId != null
+        ? await devices.endpointsForUserStream(ownerUserId, streamId)
+        : await devices.endpointsForStream(streamId)
+  } catch (err) {
+    log.warn('push endpoint lookup failed', { streamId, message: err.message })
+    return
+  }
+  if (!rows || rows.length === 0) return
+  const bodyStr = JSON.stringify({ stream: streamId, ref: ref ?? null })
+  await Promise.all(rows.map((r) => postTickle(r.endpoint, bodyStr, deps)))
+}
+
+// Fan a shard event out to push. Resolves personal (owner-keyed) targets to the
+// owning website user via shardLinks (an unlinked account → nobody to notify).
+// Never throws — a dead relay must never affect ingest.
+async function fromShardEvent(event, deps = {}) {
+  const links = deps.shardLinks || shardLinks
+  const targets = mapShardEvent(event, deps.tracker)
+  for (const t of targets) {
+    try {
+      if (t.ownerAccount) {
+        let owner = null
+        try {
+          owner = await links.getByAccount(t.ownerAccount)
+        } catch {
+          owner = null
+        }
+        if (!owner || owner.userId == null) continue
+        await publish(t.streamId, { ref: t.ref, ownerUserId: owner.userId }, deps)
+      } else {
+        await publish(t.streamId, { ref: t.ref }, deps)
+      }
+    } catch (err) {
+      log.warn('push dispatch target failed', { streamId: t.streamId, message: err.message })
+    }
+  }
+}
+
+module.exports = { publish, fromShardEvent, isAllowedEndpoint }

server/src/utils/shardIngest.js

@@ -17,6 +17,7 @@ const shardStateModel = require('../model/shardState/shardState.model')
 const shardLinksModel = require('../model/shardLinks/shardLinks.model')
 const uoLinkConfigModel = require('../model/uoLinkConfig/uoLinkConfig.model')
 const broadcaster = require('./shardBroadcast')
+const pushDispatch = require('./pushDispatch')
 const defaultLog = require('./logger')('shard-ingest')
 
 // Notable kinds appended to the shard_events log. High-frequency/session kinds
@@ -194,6 +195,7 @@ async function ingest(event, deps = {}) {
     shardLinks: deps.shardLinks || shardLinksModel,
     uoLinkConfig: deps.uoLinkConfig || uoLinkConfigModel,
     broadcast: deps.broadcast || broadcaster.broadcast,
+    pushDispatch: deps.pushDispatch || pushDispatch.fromShardEvent,
     log: deps.log || defaultLog,
   }
 
@@ -226,6 +228,12 @@ async function ingest(event, deps = {}) {
     } catch (err) {
       d.log.warn('broadcast failed', { kind: event.kind, message: err.message })
     }
+    // Opt-in push fan-out, off the same event source as the SSE broadcast.
+    // Fire-and-forget (a slow/dead ntfy relay must never delay or fail ingest);
+    // fromShardEvent is self-guarding, but .catch() covers any lookup rejection.
+    Promise.resolve(d.pushDispatch(event, { shardLinks: d.shardLinks })).catch((err) =>
+      d.log.warn('push dispatch failed', { kind: event.kind, message: err.message }),
+    )
   }
 
   return { logged, stored }