Host: request telemetry in its own table, 30-day retention (#110)

ddiff --git a/migrations/0010_telemetry.sql b/migrations/0010_telemetry.sql
nnew file mode 100644
iindex 0000000..14260fa
---- /dev/null
++++ b/migrations/0010_telemetry.sql
@@@ -0,0 +1,28 @@
++-- phase: expand
++-- Request telemetry (openvibe-sdk/telemetry telemetrySchema()): one row per aggregated sample, pruned after 30 days (server/index.js).
++CREATE TABLE IF NOT EXISTS telemetry_samples (
++    id                    bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
++    at                    timestamptz NOT NULL,
++    service               text NOT NULL,
++    project               text,
++    subject               text,
++    resource              text,
++    provider              text,
++    node                  text,
++    cell                  text,
++    region                text,
++    operation             text NOT NULL,
++    latency_ms            double precision,
++    queue_delay_ms        double precision,
++    ttfb_ms               double precision,
++    throughput_per_second double precision,
++    bytes                 bigint,
++    status                text,
++    cache_status          text,
++    cost_estimate         double precision,
++    route_epoch           bigint,
++    trace_id              text,
++    extra                 jsonb NOT NULL DEFAULT '{}'::jsonb
++);
++CREATE INDEX IF NOT EXISTS telemetry_samples_at_idx ON telemetry_samples (at);
++CREATE INDEX IF NOT EXISTS telemetry_samples_service_idx ON telemetry_samples (service, operation, at);
ddiff --git a/server/app.js b/server/app.js
iindex 6e85c59..7789799 100644
---- a/server/app.js
++++ b/server/app.js
@@@ -93,6 +93,7 @@ async function createApp(opts = {}) {
      app.locals.metrics = registry;
      app.locals.ctx = ctx;
      app.use(sharedMetrics.httpMetrics(registry).middleware);
++    app.use(require('openvibe-sdk/service').telemetryMiddleware);   // request telemetry: a no-op until server/index.js calls telemetry.init()
      const catalogHost = new URL(config.baseUrl).hostname.toLowerCase();
      app.use((req, res, next) => {
          let hostname;
ddiff --git a/server/index.js b/server/index.js
iindex e137529..bf338bd 100644
---- a/server/index.js
++++ b/server/index.js
@@@ -2,7 +2,8 @@
  
  /** OpenVibe.Host catalog service entry point. */
  const { createApp } = require('./app');
--const { gracefulStop } = require('openvibe-sdk/service');
++const { gracefulStop, telemetry } = require('openvibe-sdk/service');
++const { createPgTelemetrySink, startTelemetryRetention } = require('openvibe-sdk/telemetry');
  
  async function main() {
  const { app, ctx } = await createApp();
@@@ -13,6 +14,10 @@ const server = app.listen(config.port, config.host, () => {
      console.log(`[Host] events relay ${ctx.outbox.enabled ? `on → ${config.events.url}` : 'off (events wait in event_outbox)'}; worker ${config.worker.enabled ? 'on' : 'off'}`);
  });
  server.keepAliveTimeout = 65_000;
++// Request telemetry (openvibe-sdk/service, plan T1): one aggregated sample per route template, method and status
++// class each minute, stored in this service's telemetry_samples table; rows older than 14 days go daily.
++telemetry.init({ service: 'host', sink: createPgTelemetrySink({ db: ctx.store.db, log: console }), skipPrefixes: ['/shared'], intervalMs: 60_000 });
++const telemetryRetention = startTelemetryRetention({ db: ctx.store.db, log: console, olderThanDays: 14 });
  server.requestTimeout = 30_000;
  ctx.outbox.start();
  ctx.worker.start();
@@@ -28,6 +33,7 @@ const { stop } = gracefulStop({
      close: [
          () => ctx.outbox.stop(),
          () => ctx.stopMetrics(),
++        async () => { if (telemetryRetention) await telemetryRetention.stop(); await telemetry.stop(); },
          () => ctx.store.close(),
      ],
      drainMs: 4000,
ddiff --git a/test/telemetry.test.js b/test/telemetry.test.js
nnew file mode 100644
iindex 0000000..b62ef11
---- /dev/null
++++ b/test/telemetry.test.js
@@@ -0,0 +1,50 @@
++'use strict';
++/**
++ * Request telemetry (openvibe-sdk/service, plan T1 step 10): app.js mounts the process-wide telemetryMiddleware (a no-op
++ * until init), server/index.js calls telemetry.init() for service 'host' with a PostgreSQL sink, starts the 14-day
++ * retention and flushes on stop. Five hits on one route flush as ONE aggregated http.request sample; /metrics and
++ * /shared make none; the retention deletes only rows older than 14 days.
++ */
++const assert = require('assert');
++const fs = require('fs');
++const path = require('path');
++const { telemetry } = require('openvibe-sdk/service');
++const { pruneTelemetry } = require('openvibe-sdk/telemetry');
++const { boot } = require('./helpers/boot');
++(async () => {
++    const read = (p) => fs.readFileSync(path.join(__dirname, '..', p), 'utf8');
++    assert.match(read('server/index.js'), /telemetry\.init\(\{ service: 'host', sink: createPgTelemetrySink\(/, 'index.js starts the collector');
++    assert.match(read('server/index.js'), /startTelemetryRetention\(/, 'index.js starts the retention');
++    assert.match(read('server/index.js'), /[Rr]etention\.stop\(\); await telemetry\.stop\(\);/, 'the stop flushes');
++
++    const t = await boot();
++    const samples = [];
++    telemetry.init({ service: 'host', sink: async (batch) => { samples.push(...batch); }, intervalMs: 3600e3 });
++    const requests = () => samples.filter((s) => s.operation === 'http.request');
++    try {
++        for (let i = 0; i < 5; i++) assert.strictEqual((await t.api('GET', '/catalog')).status, 200);
++        await telemetry.flush();
++        const hit = requests().filter((s) => s.resource === '/catalog/' && s.status === '2xx');
++        assert.strictEqual(hit.length, 1, JSON.stringify(requests()));
++        assert.strictEqual(hit[0].service, 'host');
++        assert.strictEqual(hit[0].extra.count, 5);
++
++        samples.length = 0;
++        await await t.api('GET', '/metrics');
++        await await t.api('GET', '/shared/navbar.js');
++        await telemetry.flush();
++        assert.deepStrictEqual(requests(), [], '/metrics and /shared make no sample');
++
++        const db = t.ctx.store.db;
++        await db.query('DELETE FROM telemetry_samples');
++        const insert = (days) => db.query("INSERT INTO telemetry_samples (at, service, operation) VALUES (now() - make_interval(days => $1), 'host', 'http.request')", [days]);
++        await insert(20);
++        await insert(1);
++        assert.strictEqual(await pruneTelemetry({ db, olderThanDays: 14 }), 1);
++        assert.strictEqual((await db.query('SELECT count(*)::int AS n FROM telemetry_samples')).rows[0].n, 1);
++        console.log('telemetry ok');
++    } finally {
++        await telemetry.stop();
++        await t.close();
++    }
++})().catch((err) => { console.error(err); process.exit(1); });