diff --git a/apps/control-station/src/core/observatory/recordedJobs.ts b/apps/control-station/src/core/observatory/recordedJobs.ts
index 17031f2..cc50658 100644
--- a/apps/control-station/src/core/observatory/recordedJobs.ts
+++ b/apps/control-station/src/core/observatory/recordedJobs.ts
@@ -26,6 +26,7 @@ export interface ObservatoryRecordedJob {
   readonly sourceSessionId: string;
   readonly setupId: string;
   readonly definitionSha256: string;
+  readonly claimGeneration: number;
   readonly state: ObservatoryRecordedJobState;
   readonly restartFromZero: boolean;
   readonly resultId: string | null;
@@ -229,6 +230,7 @@ function decodeJob(value: unknown): ObservatoryRecordedJob {
     sourceSessionId: text(source.session_id, "source.session_id"),
     setupId: text(setup.setup_id, "setup.setup_id"),
     definitionSha256: String(setup.definition_sha256),
+    claimGeneration: nonNegativeInteger(row.claim_generation, "claim_generation"),
     state,
     restartFromZero: boolean(row.restart_from_zero, "restart_from_zero"),
     resultId: result === null ? null : text(result.result_id, "result.result_id"),
diff --git a/apps/control-station/src/core/observatory/recordedProgress.ts b/apps/control-station/src/core/observatory/recordedProgress.ts
new file mode 100644
index 0000000..adbb46a
--- /dev/null
+++ b/apps/control-station/src/core/observatory/recordedProgress.ts
@@ -0,0 +1,118 @@
+import type { ObservatoryRecordedJob } from "./recordedJobs";
+
+const PHASES = {
+  "source-transfer": "Передаём входные данные",
+  "source-preparation": "Подготавливаем вход",
+  computing: "Обрабатываем запись",
+  "result-assembly": "Собираем результат",
+  "result-transfer": "Передаём результат",
+} as const;
+const UNITS = { frames: "кадров", members: "файлов", steps: "операций" } as const;
+type Phase = keyof typeof PHASES;
+type Unit = keyof typeof UNITS;
+
+export interface RecordedProgressView {
+  readonly jobId: string;
+  readonly claimGeneration: number;
+  readonly sequence: number;
+  readonly phase: Phase;
+  readonly unit: Unit;
+  readonly completed: number;
+  readonly total: number | null;
+  readonly ageSeconds: number;
+}
+
+export async function fetchRecordedProgress(
+  job: ObservatoryRecordedJob,
+  { signal, fetcher = globalThis.fetch }: {
+    signal?: AbortSignal;
+    fetcher?: typeof globalThis.fetch;
+  } = {},
+): Promise<RecordedProgressView | null> {
+  const request = new AbortController();
+  const abort = () => request.abort();
+  signal?.addEventListener("abort", abort, { once: true });
+  if (signal?.aborted) request.abort();
+  const timer = globalThis.setTimeout(abort, 2_500);
+  try {
+    const response = await fetcher(
+      `/api/v1/observatory/runs/${encodeURIComponent(job.jobId)}/progress`,
+      { signal: request.signal, headers: { Accept: "application/json" } },
+    );
+    if (!response.ok) throw new Error("Прогресс расчёта недоступен.");
+    return decodeRecordedProgress(await response.json(), job);
+  } finally {
+    globalThis.clearTimeout(timer);
+    signal?.removeEventListener("abort", abort);
+  }
+}
+
+export function decodeRecordedProgress(
+  value: unknown, job: ObservatoryRecordedJob,
+): RecordedProgressView | null {
+  const row = object(value);
+  keys(row, ["schema_version", "job_id", "source_session_id", "setup_id",
+    "definition_sha256", "claim_generation", "state", "received_at_utc", "age_seconds", "progress"]);
+  if (row.schema_version !== "missioncore.observatory-recorded-progress-view/v1"
+    || row.job_id !== job.jobId || row.source_session_id !== job.sourceSessionId
+    || row.setup_id !== job.setupId || row.definition_sha256 !== job.definitionSha256
+    || row.claim_generation !== job.claimGeneration) throw new Error("Прогресс другой попытки.");
+  if (row.progress === null || row.state !== job.state) return null;
+  const progress = object(row.progress);
+  keys(progress, ["schema_version", "claim_generation", "sequence", "phase_index",
+    "phase", "unit", "completed", "total", "elapsed_seconds", "phase_elapsed_seconds"]);
+  if (progress.schema_version !== "missioncore.observatory-recorded-progress/v1"
+    || progress.claim_generation !== row.claim_generation
+    || !(typeof progress.phase === "string" && Object.hasOwn(PHASES, progress.phase))
+    || !(typeof progress.unit === "string" && Object.hasOwn(UNITS, progress.unit))
+    || typeof row.received_at_utc !== "string" || !Number.isFinite(Date.parse(row.received_at_utc))) {
+    throw new Error("Некорректный прогресс.");
+  }
+  const completed = integer(progress.completed);
+  const total = progress.total === null ? null : integer(progress.total, 1);
+  const elapsed = finite(progress.elapsed_seconds);
+  if ((total !== null && completed > total) || finite(progress.phase_elapsed_seconds) > elapsed) {
+    throw new Error("Некорректные счётчики прогресса.");
+  }
+  integer(progress.phase_index);
+  return {
+    jobId: job.jobId, claimGeneration: integer(progress.claim_generation, 1),
+    sequence: integer(progress.sequence, 1), phase: progress.phase as Phase,
+    unit: progress.unit as Unit, completed, total, ageSeconds: finite(row.age_seconds),
+  };
+}
+
+export function recordedProgressLabel(
+  job: ObservatoryRecordedJob | null, progress: RecordedProgressView | null,
+): string {
+  if (job?.publication.state === "pending") return "Сохраняем результат";
+  if (!job || job.state === "accepted" || job.state === "queued") return "Ожидаем расчёт";
+  if (job.state === "paused" || job.state === "preemption-pending") return "Расчёт приостановлен";
+  if (job.state === "reconciliation-required") return "Проверяем состояние расчёта";
+  if (!progress || progress.jobId !== job.jobId
+    || progress.claimGeneration !== job.claimGeneration) return "Ожидаем данные расчёта";
+  if (progress.ageSeconds > 15) return "Ожидаем обновление прогресса";
+  const count = progress.total === null
+    ? (progress.completed > 0 ? ` · ${progress.completed.toLocaleString("ru-RU")} ${UNITS[progress.unit]}` : "")
+    : ` · ${progress.completed.toLocaleString("ru-RU")} / ${progress.total.toLocaleString("ru-RU")} ${UNITS[progress.unit]}`;
+  return PHASES[progress.phase] + count;
+}
+
+function object(value: unknown): Record<string, unknown> {
+  if (!value || typeof value !== "object" || Array.isArray(value)) throw new Error("Прогресс: ожидался объект.");
+  return value as Record<string, unknown>;
+}
+function keys(row: Record<string, unknown>, expected: string[]): void {
+  if (Object.keys(row).length !== expected.length || expected.some((key) => !Object.hasOwn(row, key))) {
+    throw new Error("Прогресс: неизвестные поля.");
+  }
+}
+function finite(value: unknown): number {
+  if (typeof value !== "number" || !Number.isFinite(value) || value < 0) throw new Error("Прогресс: некорректное число.");
+  return value;
+}
+function integer(value: unknown, minimum = 0): number {
+  const number = finite(value);
+  if (!Number.isSafeInteger(number) || number < minimum) throw new Error("Прогресс: некорректный счётчик.");
+  return number;
+}
diff --git a/apps/control-station/src/core/observatory/useObservatoryRecordedJobs.ts b/apps/control-station/src/core/observatory/useObservatoryRecordedJobs.ts
index df5b325..9f0a775 100644
--- a/apps/control-station/src/core/observatory/useObservatoryRecordedJobs.ts
+++ b/apps/control-station/src/core/observatory/useObservatoryRecordedJobs.ts
@@ -1,4 +1,5 @@
 import { useCallback, useEffect, useRef, useState } from "react";
+import { fetchRecordedProgress, type RecordedProgressView } from "./recordedProgress";
 
 import {
   fetchObservatoryRecordedJobs,
@@ -21,6 +22,7 @@ interface JobSnapshot {
   readonly jobs: readonly ObservatoryRecordedJob[];
   readonly state: RecordedJobsState;
   readonly error: string | null;
+  readonly progress?: RecordedProgressView | null;
 }
 const EMPTY_JOBS = [] as const;
 const OPEN_STATES = new Set([
@@ -63,14 +65,19 @@ export function useObservatoryRecordedJobs(
     setSnapshot({
       selectionKey, jobs,
       state: jobs.length > 0 ? "refreshing" : "loading", error: null,
+      progress: current?.progress ?? null,
     });
     void fetchObservatoryRecordedJobs(sourceSessionId, setupId, {
       definitionSha256, signal: request.signal,
-    }).then((next) => {
+    }).then(async (next) => {
       if (request.signal.aborted || requestSequence.current !== sequence) return;
       const pending = next.find((job) => OPEN_STATES.has(job.state));
+      const progress = pending
+        ? await fetchRecordedProgress(pending, { signal: request.signal }).catch(() => null)
+        : null;
+      if (request.signal.aborted || requestSequence.current !== sequence) return;
       if (pending) observedJobId.current = pending.jobId;
-      setSnapshot({ selectionKey, jobs: next, state: "ready", error: null });
+      setSnapshot({ selectionKey, jobs: next, state: "ready", error: null, progress });
     }).catch((caught: unknown) => {
       if (request.signal.aborted || requestSequence.current !== sequence) return;
       setSnapshot({
@@ -95,7 +102,7 @@ export function useObservatoryRecordedJobs(
     && latestJob.jobId === observedJobId.current;
 
   useEffect(() => {
-    if (state !== "ready" || (!activeJob && !publicationPending)) return;
+    if ((state !== "ready" && state !== "error") || (!activeJob && !publicationPending)) return;
     const timer = globalThis.setTimeout(
       () => setRevision((value) => value + 1),
       POLL_INTERVAL_MS,
@@ -185,6 +192,7 @@ export function useObservatoryRecordedJobs(
 
   return {
     jobs, latestJob, activeJob, publicationPending, computationFailed,
+    progress: current?.progress ?? null,
     state, error, refresh, submit, retryPublication,
   };
 }
diff --git a/apps/control-station/src/workspaces/observatory/ObservatoryWorkspace.tsx b/apps/control-station/src/workspaces/observatory/ObservatoryWorkspace.tsx
index fb81b24..531b034 100644
--- a/apps/control-station/src/workspaces/observatory/ObservatoryWorkspace.tsx
+++ b/apps/control-station/src/workspaces/observatory/ObservatoryWorkspace.tsx
@@ -33,6 +33,7 @@ import {
 import { useObservatoryCatalog } from "../../core/observatory/useObservatoryCatalog";
 import { useObservatoryLaboratorySetups } from "../../core/observatory/useObservatoryLaboratorySetups";
 import { useObservatoryRecordedJobs } from "../../core/observatory/useObservatoryRecordedJobs";
+import { recordedProgressLabel } from "../../core/observatory/recordedProgress";
 import type { WorkspaceDefinition } from "../../productModel";
 
 const EMPTY_OBSERVATORY_ITEMS = [] as const;
@@ -466,7 +467,12 @@ export function ObservatoryWorkspace({
           </Button>
           <div className="observatory-catalog-bar__run" aria-busy={calculationPending}>
             {calculationPending ? (
-              <ActivityIndicator size="compact" label="Ожидание результата расчёта" />
+              <>
+                <ActivityIndicator size="compact" />
+                <span role="status">
+                  {recordedProgressLabel(presentedJob, recordedJobsController.progress)}
+                </span>
+              </>
             ) : null}
             {showCalculate ? (
               <Button
diff --git a/apps/control-station/test/observatoryRecordedProgress.test.mjs b/apps/control-station/test/observatoryRecordedProgress.test.mjs
new file mode 100644
index 0000000..e12b040
--- /dev/null
+++ b/apps/control-station/test/observatoryRecordedProgress.test.mjs
@@ -0,0 +1,79 @@
+import assert from "node:assert/strict";
+import { after, before, test } from "node:test";
+import { createServer } from "vite";
+
+let server;
+let decode;
+let label;
+let fetchProgress;
+const job = {
+  jobId: "observatory-run-" + "1".repeat(32),
+  sourceSessionId: "source-a", setupId: "m49-tgs",
+  definitionSha256: "a".repeat(64), claimGeneration: 2, state: "running",
+  publication: { state: "not-required" },
+};
+function view() {
+  return {
+    schema_version: "missioncore.observatory-recorded-progress-view/v1",
+    job_id: job.jobId, source_session_id: job.sourceSessionId, setup_id: job.setupId,
+    definition_sha256: job.definitionSha256, claim_generation: 2, state: "running",
+    received_at_utc: "2026-09-03T12:00:00Z", age_seconds: 0.5,
+    progress: {
+      schema_version: "missioncore.observatory-recorded-progress/v1",
+      claim_generation: 2, sequence: 4, phase_index: 2,
+      phase: "computing", unit: "frames", completed: 3, total: 10,
+      elapsed_seconds: 8, phase_elapsed_seconds: 5,
+    },
+  };
+}
+before(async () => {
+  server = await createServer({ configFile: false, logLevel: "silent", server: { middlewareMode: true } });
+  const module = await server.ssrLoadModule("/src/core/observatory/recordedProgress.ts");
+  decode = module.decodeRecordedProgress;
+  label = module.recordedProgressLabel;
+  fetchProgress = module.fetchRecordedProgress;
+});
+after(async () => { await server?.close(); });
+
+test("actual frame count is separate from completion and publication", () => {
+  const progress = decode(view(), job);
+  assert.equal(label(job, progress), "Обрабатываем запись · 3 / 10 кадров");
+  assert.equal(label({ ...job, publication: { state: "pending" } }, progress), "Сохраняем результат");
+  assert.doesNotMatch(label(job, progress), /%|завершён|FPS|ETA/);
+});
+test("unknown total never becomes a synthetic percentage", () => {
+  const value = view();
+  value.progress.total = null;
+  assert.equal(label(job, decode(value, job)), "Обрабатываем запись · 3 кадров");
+  value.progress.completed = 0;
+  assert.equal(label(job, decode(value, job)), "Обрабатываем запись");
+});
+test("old source definition or attempt cannot flash as current progress", () => {
+  for (const delta of [
+    { job_id: "other" }, { source_session_id: "other" }, { setup_id: "other" },
+    { definition_sha256: "b".repeat(64) }, { claim_generation: 1 },
+  ]) assert.throws(() => decode({ ...view(), ...delta }, job));
+  assert.equal(decode({ ...view(), state: "succeeded" }, job), null);
+  assert.equal(label({ ...job, claimGeneration: 3 }, decode(view(), job)), "Ожидаем данные расчёта");
+});
+test("invalid counters, invented phase and extra fields fail closed", () => {
+  for (const delta of [
+    { completed: true }, { completed: 11 }, { completed: -1 }, { total: 0 },
+    { completed: Number.MAX_SAFE_INTEGER + 1 }, { phase: "done" }, { path: "/private" },
+    { phase_elapsed_seconds: 9 }, { claim_generation: 3 },
+  ]) assert.throws(() => decode({ ...view(), progress: { ...view().progress, ...delta } }, job));
+});
+test("missing and stale telemetry show no fabricated advancement", () => {
+  assert.equal(decode({ ...view(), progress: null, age_seconds: null, received_at_utc: null }, job), null);
+  assert.equal(label(job, null), "Ожидаем данные расчёта");
+  assert.equal(label(job, decode({ ...view(), age_seconds: 30 }, job)), "Ожидаем обновление прогресса");
+});
+test("progress is a read-only request bound to the active job", async () => {
+  const calls = [];
+  const progress = await fetchProgress(job, { fetcher: async (path, init) => {
+    calls.push([path, init.method ?? "GET"]);
+    return new Response(JSON.stringify(view()));
+  } });
+  assert.deepEqual(calls, [[`/api/v1/observatory/runs/${job.jobId}/progress`, "GET"]]);
+  assert.equal(progress.completed, 3);
+});
diff --git a/src/k1link/observatory/installed_lab_package_runner.py b/src/k1link/observatory/installed_lab_package_runner.py
index 1974d18..8578243 100644
--- a/src/k1link/observatory/installed_lab_package_runner.py
+++ b/src/k1link/observatory/installed_lab_package_runner.py
@@ -47,6 +47,7 @@ from k1link.observatory.portable_worker_runtime import (
     PortableWorkerSourceStage,
     inspect_runtime_candidate,
 )
+from k1link.observatory.recorded_progress import report_recorded_progress
 from k1link.observatory.worker_agent import ObservatoryWorkerExecutorRegistration
 
 if TYPE_CHECKING:
@@ -467,7 +468,9 @@ class InstalledLabPackageProfileRunner:
                     }
                 ),
             )
-            for container in _topological_containers(self.package):
+            containers = _topological_containers(self.package)
+            report_recorded_progress("computing", 0, len(containers), "steps")
+            for step_index, container in enumerate(containers):
                 container_output_root = output_root
                 if container.role == "step":
                     container_output_root = steps_root / container.container_id
@@ -483,6 +486,8 @@ class InstalledLabPackageProfileRunner:
                         name_token=attempt_token,
                     )
                 )
+                report_recorded_progress("computing", step_index + 1, len(containers), "steps")
+            report_recorded_progress("result-assembly", unit="steps")
             return _read_result_draft(
                 output_root,
                 plan=plan,
diff --git a/src/k1link/observatory/m49_portable_executor.py b/src/k1link/observatory/m49_portable_executor.py
index cc631cb..ef682db 100644
--- a/src/k1link/observatory/m49_portable_executor.py
+++ b/src/k1link/observatory/m49_portable_executor.py
@@ -19,7 +19,9 @@ import shutil
 import stat
 import subprocess
 import tempfile
+import time
 from collections.abc import Callable
+from contextlib import suppress
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Final, Protocol, cast
@@ -36,6 +38,7 @@ from k1link.observatory.m49_portable_source import (
     materialize_m49_portable_source_from_worker_stage,
     validate_m49_portable_source_stage_binding,
 )
+from k1link.observatory.m49_timing_progress import M49TimingProgress
 from k1link.observatory.portable_result_contract import (
     OBSERVATION_ONLY_AUTHORITY,
     canonical_json,
@@ -53,6 +56,7 @@ from k1link.observatory.portable_worker_runtime import (
     PortableWorkerSourceMaterializer,
     PortableWorkerSourceStage,
 )
+from k1link.observatory.recorded_progress import report_recorded_progress
 from k1link.observatory.worker_agent import SealedObservatoryRecordedJob
 
 M49_COMPILED_RUNNER_BUILD_SCHEMA: Final = "missioncore.m49-tgs-portable-compiled-runner-build/v1"
@@ -257,6 +261,7 @@ class M49PortableProfileRunnerAdapter:
         try:
             output = workspace / "outputs"
             timing = workspace / "timing.tsv"
+            report_recorded_progress("computing", 0, stage.timeline_frame_count)
             invoker = self.invoker or _invoke_exact_runner
             invoker(
                 binary=self.installation.runner_binary_path,
@@ -267,6 +272,7 @@ class M49PortableProfileRunnerAdapter:
                 workspace=workspace,
                 timeout_seconds=self.installation.timeout_seconds,
             )
+            report_recorded_progress("result-assembly", unit="steps")
             package = assemble_m49_portable_result(
                 source_stage=stage,
                 runner_output_root=output,
@@ -335,19 +341,32 @@ def _invoke_exact_runner(
     stderr = workspace / "runner.stderr.log"
     try:
         with stdout.open("xb") as stdout_stream, stderr.open("xb") as stderr_stream:
-            completed = subprocess.run(
+            started = time.monotonic()
+            progress = M49TimingProgress(timing)
+            process = subprocess.Popen(
                 [str(binary), str(sequence), str(schedule), str(output), str(timing)],
                 cwd=workspace,
                 env={"LANG": "C", "LC_ALL": "C", "TZ": "UTC"},
                 stdin=subprocess.DEVNULL,
                 stdout=stdout_stream,
                 stderr=stderr_stream,
-                check=False,
-                timeout=timeout_seconds,
             )
+            try:
+                while process.poll() is None:
+                    report_recorded_progress("computing", progress.poll())
+                    remaining = timeout_seconds - (time.monotonic() - started)
+                    if remaining <= 0:
+                        raise subprocess.TimeoutExpired(str(binary), timeout_seconds)
+                    with suppress(subprocess.TimeoutExpired):
+                        process.wait(timeout=min(0.5, remaining))
+                report_recorded_progress("computing", progress.poll())
+            finally:
+                if process.poll() is None:
+                    process.kill()
+                process.wait()
     except (OSError, subprocess.SubprocessError) as exc:
         raise M49PortableExecutorError("portable M4.9 runner invocation failed") from exc
-    if completed.returncode != 0:
+    if process.returncode != 0:
         raise M49PortableExecutorError("portable M4.9 runner rejected its exact source stage")
 
 
diff --git a/src/k1link/observatory/m49_portable_source.py b/src/k1link/observatory/m49_portable_source.py
index 1ab3d0e..eaddb76 100644
--- a/src/k1link/observatory/m49_portable_source.py
+++ b/src/k1link/observatory/m49_portable_source.py
@@ -34,6 +34,7 @@ import numpy.typing as npt
 
 from k1link.compute.lidar_replay import LidarReplayPackV2, build_lidar_replay_pack_v2
 from k1link.observatory.portable_result_contract import canonical_json
+from k1link.observatory.recorded_progress import report_recorded_progress
 from k1link.observatory.source_admission import (
     PORTABLE_SOURCE_BUNDLE_SCHEMA,
     PORTABLE_SOURCE_CAPABILITY_SCHEMA,
@@ -175,6 +176,7 @@ def materialize_m49_portable_source_from_worker_stage(
         or worker_stage.source_adapter_sha256 != job.source_adapter_sha256
     ):
         raise M49PortableSourceError("Worker source stage belongs to another job")
+    report_recorded_progress("source-preparation")
     root = _safe_directory(worker_stage.root, "Worker source stage")
     manifest_payload, manifest = _read_canonical_document(
         root / "materialization-manifest.json",
@@ -487,6 +489,7 @@ def _materialize_stage(
         index_rows: list[dict[str, object]] = []
         available_slot = 0
         sequence_logical = hashlib.sha256()
+        report_recorded_progress("source-preparation", 0, len(anchors))
         for anchor in anchors:
             point_index = int(
                 np.searchsorted(point_times, anchor.session_seconds, side="right") - 1
@@ -534,6 +537,9 @@ def _materialize_stage(
                     f"{anchor.timeline_frame_index}\t{anchor.source_frame_index}"
                     f"\t{anchor.session_seconds:.9f}\t-1\t0"
                 )
+                report_recorded_progress(
+                    "source-preparation", anchor.timeline_frame_index + 1, len(anchors),
+                )
                 continue
 
             start_seconds = anchor.session_seconds - profile.history_seconds
@@ -593,6 +599,9 @@ def _materialize_stage(
                 f"\t{anchor.session_seconds:.9f}\t{available_slot}\t{native.shape[0]}"
             )
             available_slot += 1
+            report_recorded_progress(
+                "source-preparation", anchor.timeline_frame_index + 1, len(anchors),
+            )
 
         if available_slot < 1:
             raise M49PortableSourceError("portable K1 source has no admissible LiDAR frames")
diff --git a/src/k1link/observatory/m49_timing_progress.py b/src/k1link/observatory/m49_timing_progress.py
new file mode 100644
index 0000000..30149bc
--- /dev/null
+++ b/src/k1link/observatory/m49_timing_progress.py
@@ -0,0 +1,43 @@
+"""Incremental observation of flushed TGS timing rows, not result validation."""
+
+from pathlib import Path
+
+
+class M49TimingProgress:
+    def __init__(self, path: Path) -> None:
+        self.path = path
+        self.offset = 0
+        self.pending = b""
+        self.header = False
+        self.completed = 0
+        self.invalid = False
+
+    def poll(self) -> int:
+        if self.invalid:
+            return self.completed
+        try:
+            with self.path.open("rb") as stream:
+                stream.seek(self.offset)
+                data = stream.read(64 * 1024)
+                self.offset += len(data)
+        except OSError:
+            return self.completed
+        lines = (self.pending + data).split(b"\n")
+        self.pending = lines.pop()
+        if len(self.pending) > 2048:
+            self.invalid = True
+            self.pending = b""
+            return self.completed
+        for line in lines:
+            if not self.header:
+                self.header = line.startswith(b"timeline_frame_index\tsource_frame_index\t")
+                if not self.header:
+                    self.invalid = True
+                    break
+                continue
+            fields = line.split(b"\t")
+            if len(fields) != 10 or fields[0] != str(self.completed).encode():
+                self.invalid = True
+                break
+            self.completed += 1
+        return self.completed
diff --git a/src/k1link/observatory/portable_worker_runtime.py b/src/k1link/observatory/portable_worker_runtime.py
index 4e119bf..e05d09f 100644
--- a/src/k1link/observatory/portable_worker_runtime.py
+++ b/src/k1link/observatory/portable_worker_runtime.py
@@ -27,6 +27,7 @@ from k1link.observatory.portable_run_definitions import (
     PortableRunDefinitionRegistry,
     canonical_sha256,
 )
+from k1link.observatory.recorded_progress import report_recorded_progress
 from k1link.observatory.worker_agent import (
     ObservatoryWorkerExecutionResult,
     ObservatoryWorkerExecutorIdentity,
@@ -732,6 +733,7 @@ class PortableWorkerExecutorAdapter:
         job: SealedObservatoryRecordedJob,
     ) -> ObservatoryWorkerExecutionResult:
         self._verify_job(job)
+        report_recorded_progress("source-transfer", unit="members")
         source = self.source_materializer.materialize(job)
         if (
             source.source_bundle_sha256 != job.source_bundle_sha256
@@ -764,11 +766,13 @@ class PortableWorkerExecutorAdapter:
             result_contract_sha256=self.candidate.result_contract_sha256,
             phases=tuple(phase.phase_id for phase in self.candidate.phases),
         )
+        report_recorded_progress("computing", unit="steps")
         draft = self.runner.run(plan, source)
         if draft.result_contract_sha256 != self.candidate.result_contract_sha256:
             raise PortableWorkerRuntimeJobRejectedError(
                 "runtime result uses another result contract"
             )
+        report_recorded_progress("result-transfer", unit="members")
         published = self.publisher.publish(job, draft)
         if (
             published.result_id != draft.result_id
diff --git a/src/k1link/observatory/recorded_jobs.py b/src/k1link/observatory/recorded_jobs.py
index 8dbc4e5..3a219e2 100644
--- a/src/k1link/observatory/recorded_jobs.py
+++ b/src/k1link/observatory/recorded_jobs.py
@@ -32,6 +32,7 @@ from typing import Final, Literal
 from uuid import uuid4
 
 from k1link.artifacts import utc_now_iso
+from k1link.observatory.recorded_progress import RecordedProgress
 
 OBSERVATORY_RECORDED_JOB_SCHEMA: Final = "missioncore.observatory-recorded-job/v1"
 OBSERVATORY_RECORDED_JOB_REQUEST_SCHEMA: Final = "missioncore.observatory-recorded-job-request/v1"
@@ -159,6 +160,12 @@ CREATE TABLE IF NOT EXISTS observatory_recorded_jobs (
 CREATE INDEX IF NOT EXISTS observatory_recorded_jobs_queue_order
     ON observatory_recorded_jobs (state, priority_rank, created_at_utc, job_id);
 
+CREATE TABLE IF NOT EXISTS observatory_recorded_progress (
+    job_id TEXT PRIMARY KEY REFERENCES observatory_recorded_jobs(job_id),
+    snapshot_json TEXT NOT NULL CHECK (length(snapshot_json) <= 2048),
+    received_at_utc TEXT NOT NULL
+);
+
 CREATE TABLE IF NOT EXISTS observatory_recorded_claim_receipts (
     claim_request_id TEXT PRIMARY KEY,
     request_sha256 TEXT NOT NULL,
@@ -1614,6 +1621,73 @@ class ObservatoryRecordedJobQueue:
             )
             return self._get_job(connection, job_id)
 
+    def report_progress(
+        self, job_id: str, *, claim_token: str, claimant_id: str,
+        progress: RecordedProgress,
+    ) -> None:
+        """Replace one small observation, fenced in the ownership transaction."""
+        _validate_pattern(job_id, _JOB_ID, "recorded job id")
+        _validate_pattern(claim_token, _TOKEN, "claim token")
+        payload = progress.model_dump_json()
+        with self._transaction() as connection:
+            job = self._get_job(connection, job_id)
+            now = self._timestamp()
+            self._require_active_claim(job, claim_token, now=now)
+            if (
+                job.claim_generation != progress.claim_generation
+                or job.active_claimant_id != claimant_id
+            ):
+                raise ObservatoryRecordedQueueStaleClaimError("progress owner is stale")
+            if job.state != "running":
+                raise ObservatoryRecordedQueueConflictError("progress requires running execution")
+            row = connection.execute(
+                "SELECT snapshot_json FROM observatory_recorded_progress WHERE job_id = ?",
+                (job_id,),
+            ).fetchone()
+            if row is not None:
+                previous = RecordedProgress.model_validate_json(row["snapshot_json"])
+                if previous.claim_generation == progress.claim_generation:
+                    if previous == progress:
+                        return
+                    if not progress.follows(previous):
+                        raise ObservatoryRecordedQueueConflictError("progress snapshot regressed")
+            connection.execute(
+                "INSERT INTO observatory_recorded_progress VALUES (?, ?, ?) "
+                "ON CONFLICT(job_id) DO UPDATE SET snapshot_json = excluded.snapshot_json, "
+                "received_at_utc = excluded.received_at_utc",
+                (job_id, payload, now),
+            )
+
+    def progress(self, job_id: str) -> dict[str, object]:
+        """Read-only projection; never claims, renews, publishes or computes."""
+        _validate_pattern(job_id, _JOB_ID, "recorded job id")
+        with self._read_connection() as connection:
+            job = self._get_job(connection, job_id)
+            row = connection.execute(
+                "SELECT snapshot_json, received_at_utc FROM observatory_recorded_progress "
+                "WHERE job_id = ?", (job_id,),
+            ).fetchone()
+            progress = None if row is None else RecordedProgress.model_validate_json(
+                row["snapshot_json"]
+            )
+            if progress is not None and progress.claim_generation != job.claim_generation:
+                progress = None
+            return {
+                "schema_version": "missioncore.observatory-recorded-progress-view/v1",
+                "job_id": job.job_id,
+                "source_session_id": job.source_session_id,
+                "setup_id": job.setup_id,
+                "definition_sha256": job.definition_sha256,
+                "claim_generation": job.claim_generation,
+                "state": job.state,
+                "received_at_utc": None if progress is None else row["received_at_utc"],
+                "age_seconds": None if progress is None else max(0.0, (
+                    _parse_timestamp(self._timestamp(), "clock")
+                    - _parse_timestamp(row["received_at_utc"], "progress receipt")
+                ).total_seconds()),
+                "progress": None if progress is None else progress.model_dump(mode="json"),
+            }
+
     def authorize_claim_access(
         self,
         job_id: str,
@@ -2816,6 +2890,7 @@ class ObservatoryRecordedJobQueue:
 
     def _validate_schema(self, connection: sqlite3.Connection) -> None:
         expected = {
+            "observatory_recorded_progress": 3,
             "observatory_recorded_jobs": 50,
             "observatory_recorded_claim_receipts": 6,
             "observatory_recorded_claim_grants_v3": 6,
diff --git a/src/k1link/observatory/recorded_progress.py b/src/k1link/observatory/recorded_progress.py
new file mode 100644
index 0000000..a7b8b87
--- /dev/null
+++ b/src/k1link/observatory/recorded_progress.py
@@ -0,0 +1,166 @@
+"""Bounded, attempt-scoped observation of recorded execution, never authority.
+
+The execution thread owns counters; a separate bounded sender samples them.
+Progress loss cannot cancel compute or renew a claim. No frame event journal,
+estimated completion, filesystem paths, or model-dependent UI contract.
+"""
+
+from __future__ import annotations
+
+import math
+import threading
+import time
+from collections.abc import Callable, Iterator
+from contextlib import contextmanager, suppress
+from contextvars import ContextVar
+from typing import Literal
+
+from pydantic import BaseModel, ConfigDict, Field, model_validator
+
+type ProgressPhase = Literal[
+    "source-transfer",
+    "source-preparation",
+    "computing",
+    "result-assembly",
+    "result-transfer",
+]
+type ProgressUnit = Literal["frames", "members", "steps"]
+
+
+class RecordedProgress(BaseModel):
+    model_config = ConfigDict(extra="forbid", strict=True, frozen=True)
+
+    schema_version: Literal["missioncore.observatory-recorded-progress/v1"] = (
+        "missioncore.observatory-recorded-progress/v1"
+    )
+    claim_generation: int = Field(ge=1, le=2**53 - 1)
+    sequence: int = Field(ge=1, le=2**53 - 1)
+    phase_index: int = Field(ge=0, le=2**53 - 1)
+    phase: ProgressPhase
+    unit: ProgressUnit
+    completed: int = Field(ge=0, le=2**53 - 1)
+    total: int | None = Field(default=None, ge=1, le=2**53 - 1)
+    elapsed_seconds: float = Field(ge=0, allow_inf_nan=False)
+    phase_elapsed_seconds: float = Field(ge=0, allow_inf_nan=False)
+
+    @model_validator(mode="after")
+    def validate_counts(self) -> RecordedProgress:
+        if self.total is not None and self.completed > self.total:
+            raise ValueError("completed exceeds the observed total")
+        if self.phase_elapsed_seconds > self.elapsed_seconds:
+            raise ValueError("phase duration exceeds execution duration")
+        return self
+
+    def follows(self, previous: RecordedProgress) -> bool:
+        if self.claim_generation != previous.claim_generation:
+            return False
+        if self.sequence <= previous.sequence or self.phase_index < previous.phase_index:
+            return False
+        if self.elapsed_seconds < previous.elapsed_seconds:
+            return False
+        if self.phase_index != previous.phase_index:
+            return True
+        return (
+            self.phase == previous.phase
+            and self.unit == previous.unit
+            and self.completed >= previous.completed
+            and (previous.total is None or self.total == previous.total)
+            and self.phase_elapsed_seconds >= previous.phase_elapsed_seconds
+        )
+
+
+class RecordedProgressTracker:
+    def __init__(self, generation: int, *, clock: Callable[[], float] = time.monotonic):
+        self.generation = generation
+        self.clock = clock
+        self.started = clock()
+        self.phase_started = self.started
+        self.lock = threading.Lock()
+        self.phase: ProgressPhase = "source-transfer"
+        self.unit: ProgressUnit = "members"
+        self.completed = 0
+        self.total: int | None = None
+        self.phase_index = 0
+        self.sequence = 0
+
+    def update(
+        self,
+        phase: ProgressPhase,
+        completed: int = 0,
+        total: int | None = None,
+        unit: ProgressUnit = "frames",
+    ) -> None:
+        with self.lock:
+            if phase != self.phase or unit != self.unit:
+                self.phase_index += 1
+                self.phase_started = self.clock()
+            elif completed < self.completed:
+                raise ValueError("progress counter moved backwards within one phase")
+            elif total is None:
+                total = self.total
+            self.phase, self.unit = phase, unit
+            self.completed, self.total = completed, total
+
+    def sample(self) -> RecordedProgress:
+        with self.lock:
+            now = self.clock()
+            self.sequence += 1
+            return RecordedProgress(
+                claim_generation=self.generation,
+                sequence=self.sequence,
+                phase_index=self.phase_index,
+                phase=self.phase,
+                unit=self.unit,
+                completed=self.completed,
+                total=self.total,
+                elapsed_seconds=max(0.0, now - self.started),
+                phase_elapsed_seconds=max(0.0, now - self.phase_started),
+            )
+
+
+_CURRENT: ContextVar[RecordedProgressTracker | None] = ContextVar(
+    "observatory_recorded_progress",
+    default=None,
+)
+
+
+def report_recorded_progress(
+    phase: ProgressPhase,
+    completed: int = 0,
+    total: int | None = None,
+    unit: ProgressUnit = "frames",
+) -> None:
+    tracker = _CURRENT.get()
+    if tracker is not None:
+        tracker.update(phase, completed, total, unit)
+
+
+@contextmanager
+def observe_recorded_execution(
+    generation: int,
+    send: Callable[[RecordedProgress], None],
+    *,
+    interval_seconds: float = 1.0,
+) -> Iterator[RecordedProgressTracker]:
+    if not math.isfinite(interval_seconds) or not 0.01 <= interval_seconds <= 30:
+        raise ValueError("progress sampling interval is invalid")
+    tracker = RecordedProgressTracker(generation)
+    stop = threading.Event()
+
+    def pump() -> None:
+        while not stop.is_set():
+            # Progress is secondary observation, not lease or result authority.
+            with suppress(Exception):
+                send(tracker.sample())
+            stop.wait(interval_seconds)
+
+    token = _CURRENT.set(tracker)
+    thread = threading.Thread(target=pump, name="observatory-progress", daemon=True)
+    thread.start()
+    try:
+        yield tracker
+    finally:
+        _CURRENT.reset(token)
+        stop.set()
+        # The production sender reads no body and uses 2-second I/O timeouts.
+        thread.join(timeout=3.0)
diff --git a/src/k1link/observatory/worker_agent.py b/src/k1link/observatory/worker_agent.py
index 0461854..621b384 100644
--- a/src/k1link/observatory/worker_agent.py
+++ b/src/k1link/observatory/worker_agent.py
@@ -18,6 +18,7 @@ import json
 import re
 import threading
 from collections.abc import Callable, Mapping
+from contextlib import nullcontext
 from dataclasses import dataclass
 from datetime import datetime
 from typing import Annotated, Final, Literal, Protocol
@@ -31,6 +32,7 @@ from k1link.observatory.recorded_jobs import (
     OBSERVATORY_RECORDED_JOB_SCHEMA,
     RecordedExecutorIdentity,
 )
+from k1link.observatory.recorded_progress import observe_recorded_execution
 
 WORKER_006_CONTOUR_ID: Final = "worker-006"
 MAX_EXECUTOR_FAILURE_MESSAGE_LENGTH: Final = 512
@@ -498,7 +500,18 @@ class ObservatoryWorkerAgent:
         heartbeat.start()
 
         try:
-            result = adapter.execute(active_job)
+            send_progress = getattr(self._transport, "report_progress", None)
+            observation = (
+                observe_recorded_execution(
+                    active_job.claim_generation,
+                    lambda snapshot: send_progress(
+                        job_id=active_job.job_id, claim_token=claim.claim_token,
+                        progress=snapshot,
+                    ),
+                ) if callable(send_progress) else nullcontext()
+            )
+            with observation:
+                result = adapter.execute(active_job)
             if not isinstance(result, ObservatoryWorkerExecutionResult):
                 raise TypeError("executor returned an unknown result contract")
         except Exception as exc:
diff --git a/src/k1link/observatory/worker_http_transport.py b/src/k1link/observatory/worker_http_transport.py
index 5a4509e..e95bd2d 100644
--- a/src/k1link/observatory/worker_http_transport.py
+++ b/src/k1link/observatory/worker_http_transport.py
@@ -47,6 +47,7 @@ from k1link.observatory.portable_worker_runtime import (
     PortableWorkerResultDraft,
     PortableWorkerSourceStage,
 )
+from k1link.observatory.recorded_progress import RecordedProgress, report_recorded_progress
 from k1link.observatory.source_admission import (
     PORTABLE_SPATIAL_REPLAY_METADATA_ARTIFACT_ID,
     PORTABLE_SPATIAL_REPLAY_METADATA_MEDIA_TYPE,
@@ -279,6 +280,23 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
             },
         )
 
+    def report_progress(
+        self, *, job_id: str, claim_token: str, progress: RecordedProgress,
+    ) -> None:
+        context = self._require_cached_claim(job_id, claim_token)
+        if progress.claim_generation != context.claim_generation:
+            raise ObservatoryWorkerHttpError("progress generation changed")
+        # No response body is needed. Bounded I/O cannot stall the execution thread.
+        with self._client.stream(
+            "POST", self._job_path(job_id, "progress"),
+            json={
+                "schema_version": "missioncore.observatory-worker-progress-request/v1",
+                "claim_token": claim_token, "progress": progress.model_dump(mode="json"),
+            }, timeout=httpx.Timeout(2.0),
+        ) as response:
+            if response.status_code != 204:
+                raise ObservatoryWorkerHttpError("progress observation was not accepted")
+
     def succeed(
         self,
         *,
@@ -336,6 +354,7 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
             headers=headers,
         )
         members = _source_members(manifest, job)
+        report_recorded_progress("source-transfer", 0, len(members), "members")
         root = _secure_directory(
             self._work_root
             / "sources"
@@ -368,10 +387,16 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
                 members=camera_members,
                 layout=layout,
             )
+        completed_members = len(camera_members) if camera_epoch_ready else 0
+        report_recorded_progress("source-transfer", completed_members, len(members), "members")
         for destination, member in destinations.items():
             if camera_epoch_ready and member.kind in {"camera-init", "camera-segment"}:
                 continue
             if _matches_file(destination, member.sha256, member.byte_length):
+                completed_members += 1
+                report_recorded_progress(
+                    "source-transfer", completed_members, len(members), "members",
+                )
                 continue
             self._download_member(
                 job_id=job.job_id,
@@ -379,6 +404,8 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
                 member=member,
                 destination=destination,
             )
+            completed_members += 1
+            report_recorded_progress("source-transfer", completed_members, len(members), "members")
         manifest_path = root / "materialization-manifest.json"
         _write_local_exact(manifest_path, canonical_json(manifest))
         return PortableWorkerSourceStage(
@@ -440,7 +467,8 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
             or {member.role for member in upload_members} != set(artifacts)
         ):
             raise ObservatoryWorkerHttpError("Worker result artifact roles are not unique")
-        for member in upload_members:
+        report_recorded_progress("result-transfer", 0, len(upload_members), "members")
+        for member_index, member in enumerate(upload_members):
             artifact = artifacts.get(member.role)
             expected_member_id = hashlib.sha256(
                 canonical_json(
@@ -461,6 +489,9 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
                     "result upload plan differs from the local manifest"
                 )
             if member.uploaded:
+                report_recorded_progress(
+                    "result-transfer", member_index + 1, len(upload_members), "members",
+                )
                 continue
             relative = relative_artifact_path(artifact.relative_path)
             source = _confined_local_member(draft.root, relative.parts)
@@ -489,6 +520,9 @@ class ObservatoryWorkerHttpGateway(ObservatoryWorkerTransport):
                 raise ObservatoryWorkerHttpError(
                     "result upload acknowledgement did not seal its member"
                 )
+            report_recorded_progress(
+                "result-transfer", member_index + 1, len(upload_members), "members",
+            )
         receipt = self._required_json_request(
             "POST",
             self._job_path(
diff --git a/src/k1link/web/observatory_api.py b/src/k1link/web/observatory_api.py
index b002218..009edcc 100644
--- a/src/k1link/web/observatory_api.py
+++ b/src/k1link/web/observatory_api.py
@@ -1151,6 +1151,17 @@ def build_observatory_router(
                 "authority": dict(_OBSERVATION_ONLY_AUTHORITY),
             }
 
+        @router.get("/api/v1/observatory/runs/{job_id}/progress")
+        def get_observatory_progress(
+            job_id: str = ApiPath(pattern=r"^observatory-run-[a-f0-9]{32}$"),
+        ) -> dict[str, object]:
+            try:
+                return recorded_job_queue.progress(job_id)
+            except ObservatoryRecordedQueueNotFoundError as exc:
+                raise HTTPException(status_code=404, detail="Расчёт не найден.") from exc
+            except (ObservatoryRecordedQueueError, ValueError) as exc:
+                raise HTTPException(status_code=503, detail="Прогресс недоступен.") from exc
+
         @router.get("/api/v1/observatory/runs/{job_id}")
         def get_observatory_recorded_run(
             job_id: str = ApiPath(
diff --git a/src/k1link/web/observatory_worker_api.py b/src/k1link/web/observatory_worker_api.py
index 7aeb0fe..8f14d53 100644
--- a/src/k1link/web/observatory_worker_api.py
+++ b/src/k1link/web/observatory_worker_api.py
@@ -51,6 +51,7 @@ from k1link.observatory.recorded_jobs import (
     ObservatoryRecordedQueueStaleClaimError,
     RecordedExecutorIdentity,
 )
+from k1link.observatory.recorded_progress import RecordedProgress
 
 OBSERVATORY_WORKER_CAPABILITY_CLAIM_REQUEST_SCHEMA: Final = (
     "missioncore.observatory-worker-claim-request/v2"
@@ -194,6 +195,12 @@ class ObservatoryWorkerRenewRequest(_StrictWorkerRequest):
     heartbeat_sequence: int = Field(ge=1)
 
 
+class ObservatoryWorkerProgressRequest(_StrictWorkerRequest):
+    schema_version: Literal["missioncore.observatory-worker-progress-request/v1"]
+    claim_token: str = Field(pattern=_CLAIM_TOKEN_PATTERN)
+    progress: RecordedProgress
+
+
 class ObservatoryWorkerCheckpointRequest(_StrictWorkerRequest):
     schema_version: Literal["missioncore.observatory-worker-checkpoint-request/v1"]
     claim_token: str = Field(pattern=_CLAIM_TOKEN_PATTERN)
@@ -333,6 +340,17 @@ def build_observatory_worker_router(
             )
         ).as_dict()
 
+    @router.post("/recorded-jobs/{job_id}/progress", status_code=204)
+    def report_job_progress(
+        request: ObservatoryWorkerProgressRequest,
+        job_id: Annotated[str, ApiPath(pattern=_JOB_ID_PATTERN)],
+    ) -> Response:
+        _queue_call(lambda: queue.report_progress(
+            job_id, claim_token=request.claim_token,
+            claimant_id=authentication.contour_id, progress=request.progress,
+        ))
+        return Response(status_code=204)
+
     @router.post("/recorded-jobs/{job_id}/checkpoint")
     def checkpoint_job(
         request: ObservatoryWorkerCheckpointRequest,
diff --git a/tests/test_observatory_recorded_progress.py b/tests/test_observatory_recorded_progress.py
new file mode 100644
index 0000000..4d50926
--- /dev/null
+++ b/tests/test_observatory_recorded_progress.py
@@ -0,0 +1,339 @@
+from __future__ import annotations
+
+import json
+import sqlite3
+import sys
+import threading
+from pathlib import Path
+
+import pytest
+from pydantic import ValidationError
+from test_observatory_recorded_jobs import _queue, _running_job
+from test_observatory_worker_api import WORKER_HEADERS, _claim_request, _services
+
+from k1link.observatory.m49_timing_progress import M49TimingProgress
+from k1link.observatory.recorded_jobs import (
+    ObservatoryRecordedQueueConflictError,
+    ObservatoryRecordedQueueStaleClaimError,
+)
+from k1link.observatory.recorded_progress import (
+    RecordedProgress,
+    RecordedProgressTracker,
+    observe_recorded_execution,
+    report_recorded_progress,
+)
+
+
+def _progress(**changes: object) -> RecordedProgress:
+    return RecordedProgress.model_validate(
+        {
+            "claim_generation": 1,
+            "sequence": 1,
+            "phase_index": 1,
+            "phase": "computing",
+            "unit": "frames",
+            "completed": 3,
+            "total": 10,
+            "elapsed_seconds": 3.0,
+            "phase_elapsed_seconds": 2.0,
+            **changes,
+        }
+    )
+
+
+@pytest.mark.parametrize(
+    "change",
+    [
+        {"completed": True},
+        {"completed": 11},
+        {"total": 0},
+        {"phase": "done"},
+        {"elapsed_seconds": float("nan")},
+        {"phase_elapsed_seconds": 4.0},
+        {"sequence": 2**53},
+        {"path": "/secret"},
+    ],
+)
+def test_progress_rejects_unbounded_or_invented_values(change: dict[str, object]) -> None:
+    with pytest.raises(ValidationError):
+        _progress(**change)
+
+
+def test_progress_is_one_durable_snapshot_not_job_identity_or_lease(tmp_path: Path) -> None:
+    queue = _queue(tmp_path)
+    job, claim = _running_job(queue)
+    original = queue.get(job.job_id).as_dict()
+    assert queue.progress(job.job_id)["progress"] is None
+    for sequence in range(1, 101):
+        queue.report_progress(
+            job.job_id,
+            claim_token=claim.claim_token,
+            claimant_id="recorded-worker",
+            progress=_progress(sequence=sequence),
+        )
+    assert queue.get(job.job_id).as_dict() == original
+    reopened = _queue(tmp_path)
+    view = reopened.progress(job.job_id)
+    assert view["definition_sha256"] == job.definition_sha256
+    assert view["claim_generation"] == 1
+    assert view["age_seconds"] == 0.0
+    assert view["progress"]["sequence"] == 100
+    with sqlite3.connect(queue.database_path) as connection:
+        assert (
+            connection.execute("SELECT COUNT(*) FROM observatory_recorded_progress").fetchone()[0]
+            == 1
+        )
+
+
+@pytest.mark.parametrize(
+    "change",
+    [
+        {"sequence": 1, "completed": 4},
+        {"sequence": 2, "completed": 2},
+        {"sequence": 2, "total": 12},
+        {"sequence": 2, "phase": "result-transfer"},
+        {"sequence": 2, "elapsed_seconds": 2.0},
+    ],
+)
+def test_progress_retry_is_idempotent_and_regressions_rejected(tmp_path: Path, change) -> None:
+    queue = _queue(tmp_path)
+    job, claim = _running_job(queue)
+
+    def send(value):
+        queue.report_progress(
+            job.job_id, claim_token=claim.claim_token, claimant_id="recorded-worker", progress=value
+        )
+
+    send(_progress())
+    send(_progress())
+    with pytest.raises(ObservatoryRecordedQueueConflictError):
+        send(_progress(**change))
+    send(_progress(sequence=3, phase_index=2, phase="result-assembly", completed=0, total=None))
+
+
+def test_progress_old_generation_cannot_write_or_project_as_current(tmp_path: Path) -> None:
+    queue = _queue(tmp_path)
+    job, claim = _running_job(queue)
+    with pytest.raises(ObservatoryRecordedQueueStaleClaimError):
+        queue.report_progress(
+            job.job_id,
+            claim_token=claim.claim_token,
+            claimant_id="recorded-worker",
+            progress=_progress(claim_generation=2),
+        )
+    with pytest.raises(ObservatoryRecordedQueueStaleClaimError):
+        queue.report_progress(
+            job.job_id,
+            claim_token=claim.claim_token,
+            claimant_id="another-worker",
+            progress=_progress(),
+        )
+    # Synthetic old attempt retained on disk is not the new attempt's progress.
+    with sqlite3.connect(queue.database_path) as connection:
+        connection.execute(
+            "INSERT INTO observatory_recorded_progress VALUES (?, ?, ?)",
+            (job.job_id, _progress(claim_generation=2).model_dump_json(), job.created_at_utc),
+        )
+    assert queue.progress(job.job_id)["progress"] is None
+
+
+def test_progress_tracker_preserves_total_and_separates_phases() -> None:
+    tracker = RecordedProgressTracker(2, clock=lambda: 10.0)
+    tracker.update("computing", 0, 10)
+    first = tracker.sample()
+    tracker.update("computing", 2)
+    second = tracker.sample()
+    assert second.total == 10 and second.follows(first)
+    tracker.update("result-assembly", unit="steps")
+    third = tracker.sample()
+    assert third.completed == 0 and third.total is None and third.follows(second)
+
+
+def test_m49_invoker_preserves_arguments_and_observes_real_output(tmp_path, monkeypatch):
+    from k1link.observatory import m49_portable_executor as executor
+
+    script = tmp_path / "synthetic.py"
+    script.write_text(
+        "import os, sys\n"
+        "from pathlib import Path\n"
+        "assert sys.argv[1] == 'schedule.tsv'\n"
+        "assert sys.argv[2] == 'outputs'\n"
+        "assert os.environ['LANG'] == 'C' and os.environ['TZ'] == 'UTC'\n"
+        "Path(sys.argv[3]).write_text('timeline_frame_index\\tsource_frame_index\\tother\\n'"
+        " + '0\\t0\\t0\\t1\\t0\\t12\\t10\\t2\\t1.2\\t1.3\\n')\n"
+        "print('synthetic runner completed')\n"
+    )
+    counters = []
+    monkeypatch.setattr(
+        executor, "report_recorded_progress", lambda phase, count: counters.append(count)
+    )
+    executor._invoke_exact_runner(
+        binary=Path(sys.executable),
+        sequence=script,
+        schedule=Path("schedule.tsv"),
+        output=Path("outputs"),
+        timing=tmp_path / "timing.tsv",
+        workspace=tmp_path,
+        timeout_seconds=5,
+    )
+    assert counters[-1] == 1
+    assert (tmp_path / "runner.stdout.log").read_text().strip() == "synthetic runner completed"
+    assert (tmp_path / "runner.stderr.log").read_bytes() == b""
+
+
+def test_m49_invoker_timeout_reaps_only_its_child(tmp_path):
+    import os
+
+    from k1link.observatory.m49_portable_executor import (
+        M49PortableExecutorError,
+        _invoke_exact_runner,
+    )
+
+    script = tmp_path / "synthetic.py"
+    script.write_text(
+        "import os, time\nfrom pathlib import Path\n"
+        "Path('synthetic.pid').write_text(str(os.getpid()))\ntime.sleep(30)\n"
+    )
+    with pytest.raises(M49PortableExecutorError, match="invocation failed"):
+        _invoke_exact_runner(
+            binary=Path(sys.executable),
+            sequence=script,
+            schedule=tmp_path / "schedule.tsv",
+            output=tmp_path / "outputs",
+            timing=tmp_path / "timing.tsv",
+            workspace=tmp_path,
+            timeout_seconds=1,
+        )
+    pid = int((tmp_path / "synthetic.pid").read_text())
+    with pytest.raises(ProcessLookupError):
+        os.kill(pid, 0)
+
+
+def test_progress_sender_failure_does_not_escape_or_leave_a_thread() -> None:
+    sampled = threading.Event()
+
+    def unavailable(snapshot):
+        assert isinstance(snapshot, RecordedProgress)
+        sampled.set()
+        raise RuntimeError("synthetic observer connection loss")
+
+    with observe_recorded_execution(1, unavailable, interval_seconds=0.01) as tracker:
+        report_recorded_progress("computing", 5, 8)
+        assert sampled.wait(1)
+        assert tracker.sample().completed == 5
+    assert not any(thread.name == "observatory-progress" for thread in threading.enumerate())
+    report_recorded_progress("computing", 1, 2)  # no leaked execution context
+    assert tracker.sample().completed == 5
+
+
+def test_worker_keeps_compute_and_lease_when_progress_transport_fails(tmp_path: Path) -> None:
+    from test_observatory_worker_agent import (
+        BlockingExecutor,
+        FakeTransport,
+        _enqueue,
+        _heartbeat_agent,
+    )
+    from test_observatory_worker_agent import (
+        _queue as worker_queue,
+    )
+
+    queue = worker_queue(tmp_path)
+    job_id = _enqueue(queue)
+    attempted = threading.Event()
+    entered, release = threading.Event(), threading.Event()
+
+    class ObserverFailureTransport(FakeTransport):
+        def report_progress(self, **_kwargs):
+            attempted.set()
+            raise RuntimeError("observer unavailable")
+
+    agent = _heartbeat_agent(
+        ObserverFailureTransport(queue),
+        BlockingExecutor(entered=entered, release=release),
+    )
+    reports = []
+    thread = threading.Thread(target=lambda: reports.append(agent.run_once()))
+    thread.start()
+    assert entered.wait(2) and attempted.wait(2)
+    release.set()
+    thread.join(2)
+    assert not thread.is_alive()
+    assert reports[0].state == "succeeded"
+    assert queue.get(job_id).state == "succeeded"
+
+
+def test_http_progress_uses_active_claim_and_short_bodyless_request(tmp_path: Path) -> None:
+    import httpx
+    from test_observatory_worker_http_transport import (
+        BEARER_TOKEN,
+        CLAIM_TOKEN,
+        JOB_ID,
+        _cache_claim,
+        _claim_response,
+    )
+
+    from k1link.observatory.worker_http_transport import ObservatoryWorkerHttpGateway
+
+    requests = []
+
+    def handle(request):
+        if request.url.path.endswith("/claims"):
+            return _claim_response()
+        requests.append(request)
+        assert request.url.path.endswith("/progress")
+        assert request.extensions["timeout"]["read"] == 2.0
+        assert json.loads(request.content)["claim_token"] == CLAIM_TOKEN
+        return httpx.Response(204)
+
+    with ObservatoryWorkerHttpGateway(
+        base_url="http://127.0.0.1:8000",
+        bearer_token=BEARER_TOKEN,
+        work_root=tmp_path,
+        transport=httpx.MockTransport(handle),
+    ) as gateway:
+        _cache_claim(gateway)
+        gateway.report_progress(job_id=JOB_ID, claim_token=CLAIM_TOKEN, progress=_progress())
+    assert len(requests) == 1
+
+
+def test_tgs_progress_counts_only_complete_ordered_flushed_rows(tmp_path: Path) -> None:
+    path = tmp_path / "timing.tsv"
+    observer = M49TimingProgress(path)
+    assert observer.poll() == 0
+    path.write_bytes(
+        b"timeline_frame_index\tsource_frame_index\trest\n0\t0\t0\t1\t0\t1\t1\t0\t1\t1\n1\t1"
+    )
+    assert observer.poll() == 1
+    with path.open("ab") as stream:
+        stream.write(b"\t1\t1\t1\t1\t1\t0\t1\t1\n")
+    assert observer.poll() == 2
+    with path.open("ab") as stream:
+        stream.write(b"4\t4\t4\t1\t4\t1\t1\t0\t1\t1\n")
+    assert observer.poll() == 2 and observer.invalid
+
+
+def test_progress_api_requires_auth_exact_claim_and_strict_payload(tmp_path: Path) -> None:
+    from test_observatory_worker_api import _enqueue
+
+    client, queue = _services(tmp_path)
+    job_id = _enqueue(queue)
+    response = client.post(
+        "/api/v1/worker/observatory/recorded-jobs/claims",
+        headers=WORKER_HEADERS,
+        json=_claim_request("progress-claim"),
+    )
+    claim = response.json()
+    token = claim["claim_token"]
+    queue.start(job_id, claim_token=token)
+    path = f"/api/v1/worker/observatory/recorded-jobs/{job_id}/progress"
+    body = {
+        "schema_version": "missioncore.observatory-worker-progress-request/v1",
+        "claim_token": token,
+        "progress": _progress().model_dump(mode="json"),
+    }
+    assert client.post(path, json=body).status_code == 401
+    assert (
+        client.post(path, headers=WORKER_HEADERS, json={**body, "command": "no"}).status_code == 422
+    )
+    assert client.post(path, headers=WORKER_HEADERS, json=body).status_code == 204
+    assert queue.progress(job_id)["progress"] == json.loads(_progress().model_dump_json())