SDK 0.25.2: openvibe-sdk/realtime follows Events' opaque cursors (ADR-042): it resumes from the last SSE id exactly as Events sent it and dedupes on the seq in the message data (0.25.1 parsed a cursor id as a number, so resume and the repeat filter stopped advancing); subscription.lastEventId is the raw id. A cursor-id resume test.

ddiff --git a/CHANGELOG.md b/CHANGELOG.md
iindex 57c13b9..faaf57d 100644
---- a/CHANGELOG.md
++++ b/CHANGELOG.md
@@@ -8,6 +8,13 @@ release may change an API and says so here.
  
  
  
++## 0.25.2 (2026-09-29)
++
++- `openvibe-sdk/realtime` follows Events' opaque cursors (ADR-042): it resumes from the last SSE id exactly as Events
++  sent it (a cursor, or a seq from an older Events) and dedupes on the `seq` in the message data. With cursor ids the
++  previous release parsed the id as a number, so its resume position and repeat filter stopped advancing.
++  `subscription.lastEventId` is now that raw id (a string).
++
  ## 0.25.1 (2026-09-29)
  
  - `verifyServiceToken({ jwks })` also takes a JWKS client the service already holds (`jwksClient(url)`, or one a test
ddiff --git a/browser/openvibe-sdk.mjs b/browser/openvibe-sdk.mjs
iindex c6b3aca..e46d362 100644
---- a/browser/openvibe-sdk.mjs
++++ b/browser/openvibe-sdk.mjs
@@@ -1,4 +1,4 @@
--// Generated by scripts/browser-bundle.js from browser.js (openvibe-sdk 0.25.1, MIT). Do not edit.
++// Generated by scripts/browser-bundle.js from browser.js (openvibe-sdk 0.25.2, MIT). Do not edit.
  // One self-contained ES module: core at the top level plus the browser-safe subpaths as namespaces
  // (auth, registry, modules, realtime, media, community, search, chat, ai, jobs, tools, projects, geo). No server-only code: no service tokens, JWT verification, events, identity.
  /* eslint-disable */
@@@ -41,7 +41,7 @@ const { paginate, offsetPager } = __load(7);
  const semver = __load(6);
  
  /** The package version (test/version.test.js keeps it equal to package.json). */
--const SDK_VERSION = '0.25.1';
++const SDK_VERSION = '0.25.2';
  
  module.exports = {
      createClient,
@@@ -987,7 +987,10 @@ function subscribe(topics, onEvent, opts = {}) {
      const fetchImpl = opts.fetch || (typeof globalThis.fetch === 'function' ? globalThis.fetch.bind(globalThis) : null);
      const ES = opts.EventSource !== undefined ? opts.EventSource : globalThis.EventSource;
  
--    const state = { lastSeq: lastEventId != null && lastEventId !== '' ? Number(lastEventId) : null, closed: false, transport: null, connected: false };
++    // The position to resume from is the last SSE id as Events sent it: an opaque cursor (ADR-042) or, from an older
++    // Events, a bare seq. Dedupe compares the numeric seq the message data carries.
++    const initial = lastEventId != null && lastEventId !== '' ? String(lastEventId) : null;
++    const state = { lastId: initial, lastSeq: initial != null && /^\d+$/.test(initial) ? Number(initial) : null, closed: false, transport: null, connected: false };
      const stop = new AbortController();
      let es = null;
      let retryMs = reconnectDelayMs;
@@@ -1005,11 +1008,12 @@ function subscribe(topics, onEvent, opts = {}) {
          if (type !== 'message' || !data) return;
          let msg;
          try { msg = JSON.parse(data); } catch { report(new OpenVibeError({ code: 'sdk.bad_response', message: 'realtime: undecodable message' })); return; }
--        const seq = Number(id !== undefined && id !== '' ? id : msg && msg.seq);
++        const seq = Number(msg && msg.seq != null ? msg.seq : id);
          if (Number.isFinite(seq)) {
              if (state.lastSeq != null && seq <= state.lastSeq) return;      // already delivered
              state.lastSeq = seq;
          }
++        if (id !== undefined && id !== '') state.lastId = String(id);
          try { onEvent(msg && msg.event, { seq }); } catch (err) { report(err); }
      }
  
@@@ -1043,7 +1047,7 @@ function subscribe(topics, onEvent, opts = {}) {
              stop.signal.addEventListener('abort', abort, { once: true });
              try {
                  const headers = { Accept: 'text/event-stream', 'Cache-Control': 'no-cache' };
--                if (state.lastSeq != null) headers['Last-Event-ID'] = String(state.lastSeq);
++                if (state.lastId != null) headers['Last-Event-ID'] = state.lastId;
                  const t = await bearer();
                  if (t) headers.Authorization = `Bearer ${t}`;
                  const init = { headers, signal: ctrl.signal, cache: 'no-store' };
@@@ -1082,7 +1086,7 @@ function subscribe(topics, onEvent, opts = {}) {
          const open = () => {
              if (state.closed) return;
              const target = new URL(u.toString());
--            if (state.lastSeq != null) target.searchParams.set('last_event_id', String(state.lastSeq));
++            if (state.lastId != null) target.searchParams.set('last_event_id', state.lastId);
              es = new ES(target.toString(), { withCredentials });
              es.onopen = () => { failures = 0; state.connected = true; if (onOpen) { try { onOpen(); } catch (err) { report(err); } } };
              es.onmessage = (m) => dispatch('message', m.data, m.lastEventId);
@@@ -1112,7 +1116,7 @@ function subscribe(topics, onEvent, opts = {}) {
              stop.abort();
              if (es) { try { es.close(); } catch { /* already closed */ } }
          },
--        get lastEventId() { return state.lastSeq; },
++        get lastEventId() { return state.lastId; },
          get transport() { return state.transport; },
          get connected() { return state.connected; },
          get closed() { return state.closed; },
ddiff --git a/package-lock.json b/package-lock.json
iindex 67352d3..1d4aac8 100644
---- a/package-lock.json
++++ b/package-lock.json
@@@ -1,12 +1,12 @@
  {
    "name": "openvibe-sdk",
--  "version": "0.25.1",
++  "version": "0.25.2",
    "lockfileVersion": 3,
    "requires": true,
    "packages": {
      "": {
        "name": "openvibe-sdk",
--      "version": "0.25.1",
++      "version": "0.25.2",
        "license": "MIT",
        "devDependencies": {
          "@electric-sql/pglite": "^0.5.8",
ddiff --git a/package.json b/package.json
iindex 4f686c5..e71a783 100644
---- a/package.json
++++ b/package.json
@@@ -1,6 +1,6 @@
  {
    "name": "openvibe-sdk",
--  "version": "0.25.1",
++  "version": "0.25.2",
    "description": "Supported browser and server clients for the OpenVibe platform: auth (incl. developer apps), registry discovery, identity, user modules, events, realtime, media, community, search, chat, AI runs, Tools (registry, run API and jobs), VIP memberships and developer projects, the async PostgreSQL data layer (db) and the Valkey cache, limits store, queue and pub/sub, with deadlines, safe retries, problem errors and trace propagation.",
    "main": "index.js",
    "types": "types/index.d.ts",
ddiff --git a/src/core/index.js b/src/core/index.js
iindex 5dd2b2b..1d98a74 100644
---- a/src/core/index.js
++++ b/src/core/index.js
@@@ -8,7 +8,7 @@ const { paginate, offsetPager } = require('./paginate');
  const semver = require('./semver');
  
  /** The package version (test/version.test.js keeps it equal to package.json). */
--const SDK_VERSION = '0.25.1';
++const SDK_VERSION = '0.25.2';
  
  module.exports = {
      createClient,
ddiff --git a/src/realtime.js b/src/realtime.js
iindex 7c2bb27..0c76328 100644
---- a/src/realtime.js
++++ b/src/realtime.js
@@@ -35,7 +35,10 @@ function subscribe(topics, onEvent, opts = {}) {
      const fetchImpl = opts.fetch || (typeof globalThis.fetch === 'function' ? globalThis.fetch.bind(globalThis) : null);
      const ES = opts.EventSource !== undefined ? opts.EventSource : globalThis.EventSource;
  
--    const state = { lastSeq: lastEventId != null && lastEventId !== '' ? Number(lastEventId) : null, closed: false, transport: null, connected: false };
++    // The position to resume from is the last SSE id as Events sent it: an opaque cursor (ADR-042) or, from an older
++    // Events, a bare seq. Dedupe compares the numeric seq the message data carries.
++    const initial = lastEventId != null && lastEventId !== '' ? String(lastEventId) : null;
++    const state = { lastId: initial, lastSeq: initial != null && /^\d+$/.test(initial) ? Number(initial) : null, closed: false, transport: null, connected: false };
      const stop = new AbortController();
      let es = null;
      let retryMs = reconnectDelayMs;
@@@ -53,11 +56,12 @@ function subscribe(topics, onEvent, opts = {}) {
          if (type !== 'message' || !data) return;
          let msg;
          try { msg = JSON.parse(data); } catch { report(new OpenVibeError({ code: 'sdk.bad_response', message: 'realtime: undecodable message' })); return; }
--        const seq = Number(id !== undefined && id !== '' ? id : msg && msg.seq);
++        const seq = Number(msg && msg.seq != null ? msg.seq : id);
          if (Number.isFinite(seq)) {
              if (state.lastSeq != null && seq <= state.lastSeq) return;      // already delivered
              state.lastSeq = seq;
          }
++        if (id !== undefined && id !== '') state.lastId = String(id);
          try { onEvent(msg && msg.event, { seq }); } catch (err) { report(err); }
      }
  
@@@ -91,7 +95,7 @@ function subscribe(topics, onEvent, opts = {}) {
              stop.signal.addEventListener('abort', abort, { once: true });
              try {
                  const headers = { Accept: 'text/event-stream', 'Cache-Control': 'no-cache' };
--                if (state.lastSeq != null) headers['Last-Event-ID'] = String(state.lastSeq);
++                if (state.lastId != null) headers['Last-Event-ID'] = state.lastId;
                  const t = await bearer();
                  if (t) headers.Authorization = `Bearer ${t}`;
                  const init = { headers, signal: ctrl.signal, cache: 'no-store' };
@@@ -130,7 +134,7 @@ function subscribe(topics, onEvent, opts = {}) {
          const open = () => {
              if (state.closed) return;
              const target = new URL(u.toString());
--            if (state.lastSeq != null) target.searchParams.set('last_event_id', String(state.lastSeq));
++            if (state.lastId != null) target.searchParams.set('last_event_id', state.lastId);
              es = new ES(target.toString(), { withCredentials });
              es.onopen = () => { failures = 0; state.connected = true; if (onOpen) { try { onOpen(); } catch (err) { report(err); } } };
              es.onmessage = (m) => dispatch('message', m.data, m.lastEventId);
@@@ -160,7 +164,7 @@ function subscribe(topics, onEvent, opts = {}) {
              stop.abort();
              if (es) { try { es.close(); } catch { /* already closed */ } }
          },
--        get lastEventId() { return state.lastSeq; },
++        get lastEventId() { return state.lastId; },
          get transport() { return state.transport; },
          get connected() { return state.connected; },
          get closed() { return state.closed; },
ddiff --git a/test/realtime.test.js b/test/realtime.test.js
iindex 664539e..35bf559 100644
---- a/test/realtime.test.js
++++ b/test/realtime.test.js
@@@ -40,13 +40,35 @@ run([
          assert.equal(connections[1].lastEventId, '2');
          assert.equal(connections[0].auth, 'Bearer user-jwt');
          assert.equal(new URL(connections[0].url, 'http://x').searchParams.get('topics'), 'live.stream.*,network.notification.*');
--        assert.equal(sub.lastEventId, 5);
++        assert.equal(sub.lastEventId, '5', 'the raw SSE id, as Events sent it');
          assert.equal(opens, 2);
          sub.close();
          await sub.done;
          await srv.close();
      }],
  
++    ['cursor ids (ADR-042): resumes with the cursor Events sent, dedupes on the seq in the data', async () => {
++        const cur = (seq) => `c1.0.${Buffer.from([seq]).toString('base64url')}`;
++        const cframe = (seq) => `id: ${cur(seq)}\ndata: ${JSON.stringify({ seq, event: { event_type: 'live.stream.started', event_id: `e${seq}` } })}\n\n`;
++        const seen = [];
++        const srv = await stubServer((req, res) => {
++            seen.push(req.headers['last-event-id']);
++            res.writeHead(200, { 'Content-Type': 'text/event-stream' });
++            res.write('retry: 10\n\n');
++            if (seen.length === 1) { res.write(cframe(1)); res.write(cframe(2)); res.end(); }
++            else { res.write(cframe(2)); res.write(cframe(3)); }
++        });
++        const got = [];
++        const sub = subscribe('live.*', (event, { seq }) => got.push([seq, event.event_id]), { url: srv.url, token: 't', reconnectDelayMs: 10 });
++        await waitFor(() => got.length === 3);
++        assert.deepEqual(got, [[1, 'e1'], [2, 'e2'], [3, 'e3']], 'the replayed event is not delivered twice');
++        assert.equal(seen[1], cur(2), 'the reconnect resumes from the cursor');
++        assert.equal(sub.lastEventId, cur(3));
++        sub.close();
++        await sub.done;
++        await srv.close();
++    }],
++
      ['starts from a saved lastEventId; stops on a fatal 401', async () => {
          const srv = await stubServer((req, res) => {
              res.writeHead(401, { 'Content-Type': 'application/problem+json' });
ddiff --git a/types/realtime.d.ts b/types/realtime.d.ts
iindex 99d9cde..a98868b 100644
---- a/types/realtime.d.ts
++++ b/types/realtime.d.ts
@@@ -23,7 +23,8 @@ export interface SubscribeOptions {
  }
  export interface RealtimeSubscription {
      close(): void;
--    readonly lastEventId: number | null;
++    /** The last SSE id as Events sent it: an opaque cursor (ADR-042), or a seq from an older Events. Save it to resume. */
++    readonly lastEventId: string | null;
      readonly transport: 'eventsource' | 'fetch';
      readonly connected: boolean;
      readonly closed: boolean;