Add P2P signalling-only netem benchmark

Add P2P split-container netem stress fixture
Record P2P selected candidate paths
2026-07-08 13:55:22 +00:00 · 2026-07-08 10:04:03 +00:00 · 2026-07-08 10:03:35 +00:00 · 2026-07-08 10:03:11 +00:00 · 2026-07-08 10:02:41 +00:00 · 2026-07-08 07:38:54 +00:00
28 changed files with 2181 additions and 146 deletions
@@ -17,6 +17,8 @@ production/

 # Test coverage and reports
 coverage/
+test/bench-network/bench-results/
+src/apps/cli/testdeno/bench-results/

 # Local environment / secrets
 .env
@@ -0,0 +1,84 @@
+# Run the Compose-packaged CLI P2P smoke benchmark.
+#
+# This workflow is intentionally non-required at first. It exercises the local
+# Compose package for CouchDB + Nostr relay + CLI runner, and uploads the
+# benchmark JSON results for inspection.
+name: cli-p2p-compose-smoke
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/cli-p2p-compose-smoke.yml'
+      - 'package.json'
+      - 'package-lock.json'
+      - 'src/apps/cli/**'
+      - 'test/bench-network/**'
+  workflow_dispatch:
+    inputs:
+      cases:
+        description: 'Comma-separated benchmark cases'
+        required: false
+        default: 'couchdb-baseline,p2p-direct-local'
+      md_files:
+        description: 'Markdown file count'
+        required: false
+        default: '2'
+      bin_files:
+        description: 'Binary file count'
+        required: false
+        default: '1'
+      couchdb_rtt_ms:
+        description: 'Requested CouchDB RTT in milliseconds'
+        required: false
+        default: '20'
+
+permissions:
+  contents: read
+
+jobs:
+  smoke:
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Show Docker versions
+        run: |
+          docker --version
+          docker compose version
+
+      - name: Run Compose P2P smoke benchmark
+        env:
+          BENCH_CASES: ${{ inputs.cases || 'couchdb-baseline,p2p-direct-local' }}
+          BENCH_MD_FILE_COUNT: ${{ inputs.md_files || '2' }}
+          BENCH_MD_MIN_SIZE_BYTES: '128'
+          BENCH_MD_MAX_SIZE_BYTES: '256'
+          BENCH_BIN_FILE_COUNT: ${{ inputs.bin_files || '1' }}
+          BENCH_BIN_SIZE_BYTES: '512'
+          BENCH_COUCHDB_RTT_MS: ${{ inputs.couchdb_rtt_ms || '20' }}
+          BENCH_SYNC_TIMEOUT: '180'
+          BENCH_PEERS_TIMEOUT: '20'
+          LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: '60000'
+          BENCH_LIVESYNC_TEST_TEE: '0'
+        run: docker compose -f test/bench-network/compose.yml run --rm bench-runner
+
+      - name: Show Compose diagnostics
+        if: failure()
+        run: |
+          docker compose -f test/bench-network/compose.yml ps
+          docker compose -f test/bench-network/compose.yml logs --no-color couchdb nostr-relay
+
+      - name: Upload benchmark results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: cli-p2p-compose-smoke-results
+          path: test/bench-network/bench-results/**
+          if-no-files-found: warn
+
+      - name: Stop Compose services
+        if: always()
+        run: docker compose -f test/bench-network/compose.yml down -v --remove-orphans
@@ -1,7 +1,7 @@
 {
    "id": "obsidian-livesync",
    "name": "Self-hosted LiveSync",
-    "version": "0.25.79",
+    "version": "0.25.80",
    "minAppVersion": "1.7.2",
    "description": "Community implementation of self-hosted livesync. Reflect your vault changes to some other devices immediately. Please make sure to disable other synchronize solutions to avoid content corruption or duplication.",
    "author": "vorotamoroz",
@@ -1,12 +1,12 @@
 {
    "name": "obsidian-livesync",
-    "version": "0.25.79",
+    "version": "0.25.80",
    "lockfileVersion": 3,
    "requires": true,
    "packages": {
        "": {
            "name": "obsidian-livesync",
-            "version": "0.25.79",
+            "version": "0.25.80",
            "license": "MIT",
            "workspaces": [
                "src/apps/cli",
@@ -16210,7 +16210,7 @@
        },
        "src/apps/cli": {
            "name": "self-hosted-livesync-cli",
-            "version": "0.25.79-cli",
+            "version": "0.25.80-cli",
            "dependencies": {
                "chokidar": "^4.0.0",
                "minimatch": "^10.2.5",
@@ -16236,7 +16236,7 @@
        },
        "src/apps/webapp": {
            "name": "livesync-webapp",
-            "version": "0.25.79-webapp",
+            "version": "0.25.80-webapp",
            "dependencies": {
                "octagonal-wheels": "^0.1.47"
            },
@@ -16251,7 +16251,7 @@
            }
        },
        "src/apps/webpeer": {
-            "version": "0.25.79-webpeer",
+            "version": "0.25.80-webpeer",
            "dependencies": {
                "octagonal-wheels": "^0.1.47"
            },
@@ -1,6 +1,6 @@
 {
    "name": "obsidian-livesync",
-    "version": "0.25.79",
+    "version": "0.25.80",
    "description": "Reflect your vault changes to some other devices immediately. Please make sure to disable other synchronize solutions to avoid content corruption or duplication.",
    "main": "main.js",
    "type": "module",
@@ -4,12 +4,21 @@ import type { ServiceContext } from "@lib/services/base/ServiceBase";
 import { LiveSyncTrysteroReplicator } from "@lib/replication/trystero/LiveSyncTrysteroReplicator";
 import { compatGlobal } from "@lib/common/coreEnvFunctions.ts";
 import { LiveSyncError } from "@lib/common/LSError";
+import { getPeerConnectionStats } from "@lib/rpc/transports/DiagRTCPeerConnections.utils";
+import { appendFile } from "node:fs/promises";

 type CLIP2PPeer = {
    peerId: string;
    name: string;
 };

+type CandidateSummary = {
+    id: string | "unknown";
+    candidateType: string | "unknown";
+    protocol: string | "unknown";
+    relayProtocol: string | "unknown";
+};
+
 function delay(ms: number): Promise<void> {
    return new Promise((resolve) => compatGlobal.setTimeout(resolve, ms));
 }
@@ -81,6 +90,74 @@ function resolvePeer(peers: CLIP2PPeer[], peerToken: string): CLIP2PPeer | undef
    return undefined;
 }

+function getReportValue<T extends string | number>(
+    report: Record<string, unknown> | undefined,
+    key: string
+): T | "unknown" {
+    const value = report?.[key];
+    return typeof value === "string" || typeof value === "number" ? (value as T) : "unknown";
+}
+
+function summariseCandidate(reports: unknown[], candidateId: string | "unknown"): CandidateSummary | undefined {
+    if (candidateId === "unknown") {
+        return undefined;
+    }
+    const report = reports.map((r) => r as Record<string, unknown>).find((r) => r.id === candidateId);
+    if (!report) {
+        return undefined;
+    }
+    return {
+        id: candidateId,
+        candidateType: getReportValue<string>(report, "candidateType"),
+        protocol: getReportValue<string>(report, "protocol"),
+        relayProtocol: getReportValue<string>(report, "relayProtocol"),
+    };
+}
+
+async function writePeerConnectionStatsIfRequested(
+    replicator: LiveSyncTrysteroReplicator,
+    peer: CLIP2PPeer
+): Promise<void> {
+    const outputPath = process.env.LIVESYNC_P2P_STATS_JSONL?.trim();
+    if (!outputPath) {
+        return;
+    }
+
+    const peerConnection = replicator.rawHost?.room?.getPeers()[peer.peerId];
+    const stats = peerConnection ? await getPeerConnectionStats(`cli-p2p-${peer.peerId}`, peerConnection) : undefined;
+    const localCandidate = summariseCandidate(stats?.reports ?? [], stats?.localCandidateId ?? "unknown");
+    const remoteCandidate = summariseCandidate(stats?.reports ?? [], stats?.remoteCandidateId ?? "unknown");
+    const selectedPath =
+        localCandidate && remoteCandidate
+            ? `${localCandidate.candidateType}<->${remoteCandidate.candidateType}`
+            : "unknown";
+
+    const payload = {
+        generatedAt: new Date().toISOString(),
+        command: "p2p-sync",
+        peerId: peer.peerId,
+        peerName: peer.name,
+        candidatePathCollected: !!stats?.selectedPair,
+        selectedPath,
+        selectedPair: stats
+            ? {
+                  id: stats.selectedPairId,
+                  state: stats.state,
+                  currentRoundTripTime: stats.currentRoundTripTime,
+                  totalRoundTripTime: stats.totalRoundTripTime,
+                  requestsSent: stats.requestsSent,
+                  responsesReceived: stats.responsesReceived,
+                  packetsDiscardedOnSend: stats.packetsDiscardedOnSend,
+                  bytesSent: stats.bytesSent,
+                  bytesReceived: stats.bytesReceived,
+              }
+            : undefined,
+        localCandidate,
+        remoteCandidate,
+    };
+    await appendFile(outputPath, `${JSON.stringify(payload)}\n`, "utf8");
+}
+
 export async function syncWithPeer(
    core: LiveSyncBaseCore<ServiceContext, never>,
    peerToken: string,
@@ -118,6 +195,7 @@ export async function syncWithPeer(
                : LiveSyncError.fromError(err ?? "P2P sync failed while requesting remote sync");
        }

+        await writePeerConnectionStatsIfRequested(replicator, targetPeer);
        return targetPeer;
    } finally {
        await replicator.close();
@@ -1,7 +1,7 @@
 {
    "name": "self-hosted-livesync-cli",
    "private": true,
-    "version": "0.25.79-cli",
+    "version": "0.25.80-cli",
    "main": "dist/index.cjs",
    "type": "module",
    "scripts": {
@@ -1,10 +1,11 @@
 import { TempDir } from "./helpers/temp.ts";
 import { applyRemoteSyncSettings, initSettingsFile } from "./helpers/settings.ts";
 import { assertFilesEqual, runCliOrFail } from "./helpers/cli.ts";
-import { startCouchdb, stopCouchdb } from "./helpers/docker.ts";
+import { createCouchdbDatabase, startCouchdb, stopCouchdb } from "./helpers/docker.ts";
 import { createDeterministicDataset, type DatasetEntry } from "./helpers/dataset.ts";

 type BenchmarkConfig = {
+    caseName: string;
    couchdbBackendUri: string;
    couchdbProxyUri: string;
    couchdbUser: string;
@@ -21,6 +22,10 @@ type BenchmarkConfig = {
    requestedRttMs: number;
    passphrase: string;
    encrypt: boolean;
+    managedCouchdb: boolean;
+    simulationTier: string;
+    networkProfile: string;
+    networkModel: string;
 };

 function readEnvString(name: string, fallback: string): string {
@@ -70,6 +75,7 @@ function formatBytes(value: number): string {

 function buildConfig(): BenchmarkConfig {
    return {
+        caseName: readEnvString("BENCH_CASE", "couchdb-baseline"),
        couchdbBackendUri: readEnvString("BENCH_COUCHDB_BACKEND_URI", "http://127.0.0.1:5989"),
        couchdbProxyUri: readEnvString("BENCH_COUCHDB_URI", "http://127.0.0.1:15989"),
        couchdbUser: readEnvString("BENCH_COUCHDB_USER", readEnvString("username", "admin")),
@@ -86,6 +92,10 @@ function buildConfig(): BenchmarkConfig {
        requestedRttMs: Math.floor(readEnvNumber("BENCH_COUCHDB_RTT_MS", 50)),
        passphrase: readEnvString("BENCH_PASSPHRASE", `bench-${Date.now()}`),
        encrypt: readEnvBool("BENCH_ENCRYPT", true),
+        managedCouchdb: readEnvBool("BENCH_COUCHDB_MANAGED", true),
+        simulationTier: readEnvString("BENCH_SIMULATION_TIER", "1"),
+        networkProfile: readEnvString("BENCH_NETWORK_PROFILE", "http-latency-proxy"),
+        networkModel: readEnvString("BENCH_NETWORK_MODEL", "local-http-proxy"),
    };
 }

@@ -200,7 +210,17 @@ async function main(): Promise<void> {
    await initSettingsFile(settingsA);
    await initSettingsFile(settingsB);

+    if (config.managedCouchdb) {
        await startCouchdb(config.couchdbBackendUri, config.couchdbUser, config.couchdbPassword, config.couchdbDbname);
+    } else {
+        console.log(`[INFO] using externally managed CouchDB: ${config.couchdbBackendUri}`);
+        await createCouchdbDatabase(
+            config.couchdbBackendUri,
+            config.couchdbUser,
+            config.couchdbPassword,
+            config.couchdbDbname
+        );
+    }

    const proxy = startCouchdbProxy({
        backendUri: config.couchdbBackendUri,
@@ -265,10 +285,15 @@ async function main(): Promise<void> {
        }

        const result = {
+            caseName: config.caseName,
            mode: "couchdb-cli-benchmark",
            couchdbBackendUri: config.couchdbBackendUri,
            couchdbProxyUri: config.couchdbProxyUri,
            couchdbDbname: config.couchdbDbname,
+            managedCouchdb: config.managedCouchdb,
+            simulationTier: config.simulationTier,
+            networkProfile: config.networkProfile,
+            networkModel: config.networkModel,
            rttRequestedMs: config.requestedRttMs,
            proxyApplied: proxy.applied,
            proxyNote: proxy.note,
@@ -300,9 +325,11 @@ async function main(): Promise<void> {
        );
    } finally {
        await proxy.stop();
+        if (config.managedCouchdb) {
            await stopCouchdb().catch(() => {});
        }
    }
+}

 if (import.meta.main) {
    main().catch((error) => {
@@ -0,0 +1,133 @@
+type SweepResult = {
+    name: string;
+    runner: "p2p" | "couchdb";
+    rttMs?: number;
+    result: Record<string, unknown>;
+};
+
+function readEnvString(name: string, fallback: string): string {
+    const value = Deno.env.get(name)?.trim();
+    return value && value.length > 0 ? value : fallback;
+}
+
+function timestamp(): string {
+    const d = new Date();
+    const pad = (n: number) => String(n).padStart(2, "0");
+    return (
+        `${d.getUTCFullYear()}${pad(d.getUTCMonth() + 1)}${pad(d.getUTCDate())}-` +
+        `${pad(d.getUTCHours())}${pad(d.getUTCMinutes())}${pad(d.getUTCSeconds())}`
+    );
+}
+
+function parseRttList(raw: string): number[] {
+    const values = raw
+        .split(",")
+        .map((value) => Number(value.trim()))
+        .filter((value) => Number.isFinite(value) && value > 0)
+        .map((value) => Math.floor(value));
+    if (values.length === 0) {
+        throw new Error(`BENCH_SWEEP_RTT_MS must contain at least one positive number, got '${raw}'`);
+    }
+    return values;
+}
+
+function buildBaseEnv(): Record<string, string> {
+    return {
+        BENCH_MD_FILE_COUNT: readEnvString("BENCH_MD_FILE_COUNT", "20"),
+        BENCH_MD_MIN_SIZE_BYTES: readEnvString("BENCH_MD_MIN_SIZE_BYTES", "512"),
+        BENCH_MD_MAX_SIZE_BYTES: readEnvString("BENCH_MD_MAX_SIZE_BYTES", "2048"),
+        BENCH_BIN_FILE_COUNT: readEnvString("BENCH_BIN_FILE_COUNT", "5"),
+        BENCH_BIN_SIZE_BYTES: readEnvString("BENCH_BIN_SIZE_BYTES", "8192"),
+        BENCH_SYNC_TIMEOUT: readEnvString("BENCH_SYNC_TIMEOUT", "300"),
+        BENCH_PEERS_TIMEOUT: readEnvString("BENCH_PEERS_TIMEOUT", "60"),
+        BENCH_SEED: readEnvString("BENCH_SEED", "livesync-benchmark-seed"),
+        LIVESYNC_TEST_TEE: readEnvString("BENCH_LIVESYNC_TEST_TEE", "0"),
+    };
+}
+
+async function runBenchmark(options: {
+    taskName: "bench:p2p" | "bench:couchdb";
+    name: string;
+    outputDir: string;
+    env: Record<string, string>;
+}): Promise<Record<string, unknown>> {
+    const resultPath = `${options.outputDir}/${options.name}.json`;
+    const env = {
+        ...Deno.env.toObject(),
+        ...options.env,
+        BENCH_RESULT_JSON: resultPath,
+    };
+
+    console.log(`[latency-sweep] running ${options.name}`);
+    const child = new Deno.Command("deno", {
+        args: ["task", options.taskName],
+        cwd: import.meta.dirname,
+        env,
+        stdin: "null",
+        stdout: "inherit",
+        stderr: "inherit",
+    }).spawn();
+    const status = await child.status;
+    if (status.code !== 0) {
+        throw new Error(`benchmark failed: ${options.name} (exit ${status.code})`);
+    }
+    return JSON.parse(await Deno.readTextFile(resultPath)) as Record<string, unknown>;
+}
+
+async function main(): Promise<void> {
+    const outRoot = readEnvString("BENCH_SWEEP_ROOT", `${import.meta.dirname}/bench-results`);
+    const outputDir = `${outRoot}/latency-sweep-${timestamp()}`;
+    const rtts = parseRttList(readEnvString("BENCH_SWEEP_RTT_MS", "20,50,100,150,300"));
+    const base = buildBaseEnv();
+
+    await Deno.mkdir(outputDir, { recursive: true });
+
+    const results: SweepResult[] = [];
+    if (readEnvString("BENCH_SWEEP_INCLUDE_P2P", "true") !== "false") {
+        const p2pResult = await runBenchmark({
+            taskName: "bench:p2p",
+            name: "p2p-direct-local",
+            outputDir,
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-direct-local",
+                BENCH_TURN_SERVERS: "",
+            },
+        });
+        results.push({ name: "p2p-direct-local", runner: "p2p", result: p2pResult });
+    }
+
+    for (const rtt of rtts) {
+        const name = `couchdb-rtt-${rtt}ms`;
+        const couchdbResult = await runBenchmark({
+            taskName: "bench:couchdb",
+            name,
+            outputDir,
+            env: {
+                ...base,
+                BENCH_CASE: name,
+                BENCH_COUCHDB_RTT_MS: String(rtt),
+            },
+        });
+        results.push({ name, runner: "couchdb", rttMs: rtt, result: couchdbResult });
+    }
+
+    const summary = {
+        generatedAt: new Date().toISOString(),
+        outputDir,
+        note:
+            "This sweep models additional remote CouchDB request latency through the existing HTTP proxy. It is not a full netem model of jitter, loss, MTU, bandwidth, or VPN encapsulation.",
+        rtts,
+        results,
+    };
+    await Deno.writeTextFile(`${outputDir}/summary.json`, JSON.stringify(summary, null, 2));
+    console.log(JSON.stringify(summary, null, 2));
+    console.log(`[latency-sweep] result directory: ${outputDir}`);
+}
+
+if (import.meta.main) {
+    main().catch((error) => {
+        console.error("[Fatal Error]", error);
+        Deno.exit(1);
+    });
+}
@@ -0,0 +1,312 @@
+type BenchmarkCase = {
+    name: string;
+    runner: "p2p" | "couchdb";
+    description: string;
+    dataPath: string;
+    trustBoundary: string;
+    env: Record<string, string>;
+};
+
+function readEnvString(name: string, fallback: string): string {
+    const value = Deno.env.get(name)?.trim();
+    return value && value.length > 0 ? value : fallback;
+}
+
+function readEnvInteger(name: string, fallback: number): number {
+    const value = readEnvString(name, String(fallback));
+    const parsed = Number(value);
+    if (!Number.isInteger(parsed) || parsed < 1) {
+        throw new Error(`${name} must be a positive integer, got '${value}'`);
+    }
+    return parsed;
+}
+
+function timestamp(): string {
+    const d = new Date();
+    const pad = (n: number) => String(n).padStart(2, "0");
+    return (
+        `${d.getUTCFullYear()}${pad(d.getUTCMonth() + 1)}${pad(d.getUTCDate())}-` +
+        `${pad(d.getUTCHours())}${pad(d.getUTCMinutes())}${pad(d.getUTCSeconds())}`
+    );
+}
+
+function buildBaseEnv(): Record<string, string> {
+    return {
+        BENCH_MD_FILE_COUNT: readEnvString("BENCH_MD_FILE_COUNT", "20"),
+        BENCH_MD_MIN_SIZE_BYTES: readEnvString("BENCH_MD_MIN_SIZE_BYTES", "512"),
+        BENCH_MD_MAX_SIZE_BYTES: readEnvString("BENCH_MD_MAX_SIZE_BYTES", "2048"),
+        BENCH_BIN_FILE_COUNT: readEnvString("BENCH_BIN_FILE_COUNT", "5"),
+        BENCH_BIN_SIZE_BYTES: readEnvString("BENCH_BIN_SIZE_BYTES", "8192"),
+        BENCH_SYNC_TIMEOUT: readEnvString("BENCH_SYNC_TIMEOUT", "300"),
+        BENCH_PEERS_TIMEOUT: readEnvString("BENCH_PEERS_TIMEOUT", "60"),
+        BENCH_SEED: readEnvString("BENCH_SEED", "livesync-benchmark-seed"),
+        LIVESYNC_TEST_TEE: readEnvString("BENCH_LIVESYNC_TEST_TEE", "0"),
+    };
+}
+
+function buildCases(): BenchmarkCase[] {
+    const base = buildBaseEnv();
+    const couchdbRtt = readEnvString("BENCH_COUCHDB_RTT_MS", "20");
+    const tetheringVpnRtt = readEnvString("BENCH_TETHERING_VPN_RTT_MS", "120");
+    const localTurnServers = readEnvString("BENCH_LOCAL_TURN_SERVERS", "turn:127.0.0.1:3478");
+    const shimCouchdbUri = readEnvString("BENCH_SHIM_COUCHDB_URI", "http://couchdb-shim:5984");
+    const signallingShimRelay = readEnvString("BENCH_SIGNAL_SHIM_RELAY", "ws://p2p-signalling-shim:7777/");
+
+    return [
+        {
+            name: "couchdb-baseline",
+            runner: "couchdb",
+            description: "Standard self-hosted CouchDB path through a local latency proxy.",
+            dataPath: "Device A -> CouchDB -> Device B",
+            trustBoundary: "CouchDB operator and network path",
+            env: {
+                ...base,
+                BENCH_CASE: "couchdb-baseline",
+                BENCH_COUCHDB_RTT_MS: couchdbRtt,
+            },
+        },
+        {
+            name: "p2p-direct-local",
+            runner: "p2p",
+            description: "Preferred direct WebRTC P2P path with Nostr signalling and TURN disabled.",
+            dataPath: "Device A -> Device B",
+            trustBoundary: "Nostr relay for signalling metadata; no TURN relay",
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-direct-local",
+                BENCH_TURN_SERVERS: "",
+                BENCH_SIMULATION_TIER: "1",
+                BENCH_NETWORK_PROFILE: "local-direct",
+                BENCH_NETWORK_MODEL: "local-runner-webrtc",
+                BENCH_P2P_CANDIDATE_PATH_VERIFICATION: "turn-disabled-but-selected-ice-pair-not-collected",
+            },
+        },
+        {
+            name: "couchdb-tethering-vpn-proxy",
+            runner: "couchdb",
+            description:
+                "Approximate smartphone tethering/VPN remote-database path using an HTTP latency proxy. This does not model loss, jitter, MTU, or VPN encapsulation.",
+            dataPath: "Device A -> VPN/network path -> CouchDB -> VPN/network path -> Device B",
+            trustBoundary: "VPN/network path and CouchDB operator",
+            env: {
+                ...base,
+                BENCH_CASE: "couchdb-tethering-vpn-proxy",
+                BENCH_COUCHDB_RTT_MS: tetheringVpnRtt,
+            },
+        },
+        {
+            name: "couchdb-netem-home-wifi",
+            runner: "couchdb",
+            description:
+                "Tier 2 CouchDB path through the Compose netem TCP shim using the home-wifi profile.",
+            dataPath: "Device A -> netem TCP shim -> CouchDB -> netem TCP shim -> Device B",
+            trustBoundary: "CouchDB operator and constrained network shim",
+            env: {
+                ...base,
+                BENCH_CASE: "couchdb-netem-home-wifi",
+                BENCH_COUCHDB_BACKEND_URI: shimCouchdbUri,
+                BENCH_COUCHDB_RTT_MS: "1",
+                BENCH_SIMULATION_TIER: "2",
+                BENCH_NETWORK_PROFILE: "home-wifi",
+                BENCH_NETWORK_MODEL: "compose-netem-tcp-shim",
+            },
+        },
+        {
+            name: "couchdb-netem-tethering-vpn",
+            runner: "couchdb",
+            description:
+                "Tier 2 CouchDB path through the Compose netem TCP shim using a tethering-vpn profile.",
+            dataPath: "Device A -> netem TCP shim -> CouchDB -> netem TCP shim -> Device B",
+            trustBoundary: "CouchDB operator and constrained smartphone/VPN-like network shim",
+            env: {
+                ...base,
+                BENCH_CASE: "couchdb-netem-tethering-vpn",
+                BENCH_COUCHDB_BACKEND_URI: shimCouchdbUri,
+                BENCH_COUCHDB_RTT_MS: "1",
+                BENCH_SIMULATION_TIER: "2",
+                BENCH_NETWORK_PROFILE: "tethering-vpn",
+                BENCH_NETWORK_MODEL: "compose-netem-tcp-shim",
+            },
+        },
+        {
+            name: "p2p-smartphone-vpn-direct",
+            runner: "p2p",
+            description:
+                "Direct P2P case name for smartphone tethering/VPN measurements. In this local runner it is unshaped and should be treated as a wiring check unless executed on that network.",
+            dataPath: "Device A -> Device B when WebRTC direct connectivity succeeds",
+            trustBoundary: "Smartphone/VPN routing policy plus Nostr signalling metadata",
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-smartphone-vpn-direct",
+                BENCH_TURN_SERVERS: "",
+                BENCH_SIMULATION_TIER: "unmeasured",
+                BENCH_NETWORK_PROFILE: "smartphone-vpn-direct-placeholder",
+                BENCH_NETWORK_MODEL: "local-runner-no-netem",
+                BENCH_P2P_CANDIDATE_PATH_VERIFICATION:
+                    "structural-placeholder-only; selected ICE pair may be collected, but the path is not shaped",
+            },
+        },
+        {
+            name: "p2p-signalling-netem-home-wifi",
+            runner: "p2p",
+            description:
+                "Tier 2 P2P path with only the Nostr signalling relay accessed through the home-wifi netem shim.",
+            dataPath: "Device A -> Device B over WebRTC DataChannel; Nostr signalling through netem shim",
+            trustBoundary: "Nostr signalling metadata through constrained network shim; no TURN relay",
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-signalling-netem-home-wifi",
+                BENCH_RELAY: signallingShimRelay,
+                BENCH_TURN_SERVERS: "",
+                BENCH_SIMULATION_TIER: "2",
+                BENCH_NETWORK_PROFILE: "home-wifi",
+                BENCH_NETWORK_MODEL: "compose-netem-signalling-shim",
+                BENCH_P2P_CANDIDATE_PATH_VERIFICATION:
+                    "selected ICE pair collected; only Nostr signalling path is shaped",
+            },
+        },
+        {
+            name: "p2p-signalling-netem-tethering-vpn",
+            runner: "p2p",
+            description:
+                "Tier 2 P2P path with only the Nostr signalling relay accessed through the tethering-vpn netem shim.",
+            dataPath: "Device A -> Device B over WebRTC DataChannel; Nostr signalling through netem shim",
+            trustBoundary: "Nostr signalling metadata through constrained smartphone/VPN-like network shim; no TURN relay",
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-signalling-netem-tethering-vpn",
+                BENCH_RELAY: signallingShimRelay,
+                BENCH_TURN_SERVERS: "",
+                BENCH_SIMULATION_TIER: "2",
+                BENCH_NETWORK_PROFILE: "tethering-vpn",
+                BENCH_NETWORK_MODEL: "compose-netem-signalling-shim",
+                BENCH_P2P_CANDIDATE_PATH_VERIFICATION:
+                    "selected ICE pair collected; only Nostr signalling path is shaped",
+            },
+        },
+        {
+            name: "p2p-user-turn",
+            runner: "p2p",
+            description: "Optional fallback path through a local user-controlled TURN server.",
+            dataPath: "Device A -> user-controlled TURN -> Device B",
+            trustBoundary: "User-controlled TURN server",
+            env: {
+                ...base,
+                BENCH_CASE: "p2p-user-turn",
+                BENCH_TURN_SERVERS: localTurnServers,
+                BENCH_SIMULATION_TIER: "1",
+                BENCH_NETWORK_PROFILE: "local-turn-fallback",
+                BENCH_NETWORK_MODEL: "local-runner-webrtc-turn-configured",
+                BENCH_P2P_CANDIDATE_PATH_VERIFICATION:
+                    "turn-configured; selected ICE pair may still be direct or relayed, so interpret the recorded candidate types",
+            },
+        },
+    ];
+}
+
+async function runCase(
+    testCase: BenchmarkCase,
+    outputDir: string,
+    repeatIndex: number,
+    repeatCount: number
+): Promise<Record<string, unknown>> {
+    const suffix = repeatCount > 1 ? `-r${String(repeatIndex).padStart(2, "0")}` : "";
+    const resultPath = `${outputDir}/${testCase.name}${suffix}.json`;
+    const taskName = testCase.runner === "p2p" ? "bench:p2p" : "bench:couchdb";
+    const env = {
+        ...Deno.env.toObject(),
+        ...testCase.env,
+        BENCH_RESULT_JSON: resultPath,
+        BENCH_REPEAT_INDEX: String(repeatIndex),
+        BENCH_REPEAT_COUNT: String(repeatCount),
+    };
+
+    const repeatLabel = repeatCount > 1 ? ` (${repeatIndex}/${repeatCount})` : "";
+    console.log(`[bench-cases] running ${testCase.name}${repeatLabel}: ${testCase.description}`);
+    const command = new Deno.Command("deno", {
+        args: ["task", taskName],
+        cwd: import.meta.dirname,
+        env,
+        stdin: "null",
+        stdout: "inherit",
+        stderr: "inherit",
+    });
+
+    const child = command.spawn();
+    const status = await child.status;
+    if (status.code !== 0) {
+        throw new Error(`case failed: ${testCase.name} (exit ${status.code})`);
+    }
+
+    const result = JSON.parse(await Deno.readTextFile(resultPath)) as Record<string, unknown>;
+    return {
+        ...testCase,
+        repeatIndex,
+        repeatCount,
+        resultPath,
+        result,
+    };
+}
+
+function selectCases(allCases: BenchmarkCase[]): BenchmarkCase[] {
+    const requested = readEnvString("BENCH_CASES", "couchdb-baseline,p2p-direct-local");
+    const names = requested
+        .split(",")
+        .map((v) => v.trim())
+        .filter((v) => v.length > 0);
+    const byName = new Map(allCases.map((c) => [c.name, c]));
+    return names.map((name) => {
+        const found = byName.get(name);
+        if (!found) {
+            throw new Error(`Unknown BENCH_CASES entry '${name}'. Available: ${allCases.map((c) => c.name).join(", ")}`);
+        }
+        return found;
+    });
+}
+
+async function main(): Promise<void> {
+    const outRoot = readEnvString("BENCH_CASES_ROOT", `${import.meta.dirname}/bench-results`);
+    const outputDir = `${outRoot}/cases-${timestamp()}`;
+    await Deno.mkdir(outputDir, { recursive: true });
+
+    const allCases = buildCases();
+    const cases = selectCases(allCases);
+    const repeatCount = readEnvInteger("BENCH_REPEAT_COUNT", 1);
+    await Deno.writeTextFile(
+        `${outputDir}/case-manifest.json`,
+        JSON.stringify(
+            {
+                generatedAt: new Date().toISOString(),
+                repeatCount,
+                selectedCases: cases,
+                availableCases: allCases,
+            },
+            null,
+            2
+        )
+    );
+
+    const results: Record<string, unknown>[] = [];
+    for (const testCase of cases) {
+        for (let repeatIndex = 1; repeatIndex <= repeatCount; repeatIndex++) {
+            results.push(await runCase(testCase, outputDir, repeatIndex, repeatCount));
+        }
+    }
+
+    const summary = {
+        generatedAt: new Date().toISOString(),
+        outputDir,
+        repeatCount,
+        results,
+    };
+    await Deno.writeTextFile(`${outputDir}/summary.json`, JSON.stringify(summary, null, 2));
+    console.log(JSON.stringify(summary, null, 2));
+    console.log(`[bench-cases] result directory: ${outputDir}`);
+}
+
+if (import.meta.main) {
+    main().catch((error) => {
+        console.error("[Fatal Error]", error);
+        Deno.exit(1);
+    });
+}
@@ -0,0 +1,435 @@
+import { join } from "@std/path";
+import { startCliInBackground } from "./helpers/backgroundCli.ts";
+import { assertFilesEqual, runCliOrFail } from "./helpers/cli.ts";
+import { createDeterministicDataset, type DatasetEntry } from "./helpers/dataset.ts";
+import { discoverPeer } from "./helpers/p2p.ts";
+import { applyP2pSettings, applyP2pTestTweaks, initSettingsFile } from "./helpers/settings.ts";
+
+type Role = "host" | "client";
+
+type NetemSummary = {
+    enabled: boolean;
+    profile: string;
+    interface: string;
+    delayMs: number;
+    jitterMs: number;
+    lossPercent: number;
+    bandwidthMbit: number;
+    mtu: number;
+    tcQdisc?: string;
+    ipAddr?: string;
+    ipRoute?: string;
+};
+
+type HostReady = {
+    generatedAt: string;
+    totalFiles: number;
+    totalBytes: number;
+    mdFileCount: number;
+    binFileCount: number;
+    mirrorElapsedMs: number;
+    netem: NetemSummary;
+};
+
+type P2PConnectionStats = {
+    candidatePathCollected: boolean;
+    selectedPath: string;
+    localCandidate?: { candidateType: string; protocol: string; relayProtocol: string };
+    remoteCandidate?: { candidateType: string; protocol: string; relayProtocol: string };
+};
+
+function errorToRecord(error: unknown): Record<string, unknown> {
+    if (error instanceof Error) {
+        return {
+            name: error.name,
+            message: error.message,
+            stack: error.stack,
+        };
+    }
+    return {
+        name: "UnknownError",
+        message: String(error),
+    };
+}
+
+function readEnvString(name: string, fallback: string): string {
+    const value = Deno.env.get(name)?.trim();
+    return value && value.length > 0 ? value : fallback;
+}
+
+function readEnvNumber(name: string, fallback: number): number {
+    const raw = Deno.env.get(name);
+    if (raw === undefined || raw.trim() === "") {
+        return fallback;
+    }
+    const parsed = Number(raw);
+    if (!Number.isFinite(parsed) || parsed < 0) {
+        throw new Error(`${name} must be a non-negative number, got '${raw}'`);
+    }
+    return parsed;
+}
+
+function nowMs(): number {
+    return performance.now();
+}
+
+async function commandOutput(command: string, args: string[]): Promise<string> {
+    const output = await new Deno.Command(command, {
+        args,
+        stdin: "null",
+        stdout: "piped",
+        stderr: "piped",
+    }).output();
+    const stdout = new TextDecoder().decode(output.stdout);
+    const stderr = new TextDecoder().decode(output.stderr);
+    if (!output.success) {
+        throw new Error(`${command} ${args.join(" ")} failed\nstdout: ${stdout}\nstderr: ${stderr}`);
+    }
+    return stdout.trim();
+}
+
+async function commandOk(command: string, args: string[]): Promise<void> {
+    await commandOutput(command, args);
+}
+
+async function applyNetemIfRequested(): Promise<NetemSummary> {
+    const enabled = readEnvString("BENCH_NETEM_ENABLED", "0") === "1";
+    const profile = readEnvString("NETEM_PROFILE", "home-wifi");
+    const iface = readEnvString("NETEM_INTERFACE", "eth0");
+    const delayMs = readEnvNumber("NETEM_DELAY_MS", 20);
+    const jitterMs = readEnvNumber("NETEM_JITTER_MS", 5);
+    const lossPercent = readEnvNumber("NETEM_LOSS_PERCENT", 0.1);
+    const bandwidthMbit = readEnvNumber("NETEM_BANDWIDTH_MBIT", 100);
+    const mtu = readEnvNumber("NETEM_MTU", 1500);
+
+    const summary: NetemSummary = {
+        enabled,
+        profile,
+        interface: iface,
+        delayMs,
+        jitterMs,
+        lossPercent,
+        bandwidthMbit,
+        mtu,
+    };
+
+    if (!enabled) {
+        return summary;
+    }
+
+    await commandOk("ip", ["link", "set", "dev", iface, "mtu", String(mtu)]);
+    await new Deno.Command("tc", { args: ["qdisc", "del", "dev", iface, "root"] }).output();
+    await commandOk("tc", [
+        "qdisc",
+        "add",
+        "dev",
+        iface,
+        "root",
+        "netem",
+        "delay",
+        `${delayMs}ms`,
+        `${jitterMs}ms`,
+        "loss",
+        `${lossPercent}%`,
+        "rate",
+        `${bandwidthMbit}mbit`,
+    ]);
+    summary.tcQdisc = await commandOutput("tc", ["qdisc", "show", "dev", iface]);
+    summary.ipAddr = await commandOutput("ip", ["addr", "show", iface]);
+    summary.ipRoute = await commandOutput("ip", ["route"]);
+    return summary;
+}
+
+async function waitForFile(path: string, timeoutMs: number): Promise<void> {
+    const started = Date.now();
+    while (Date.now() - started < timeoutMs) {
+        try {
+            const stat = await Deno.stat(path);
+            if (stat.isFile) {
+                return;
+            }
+        } catch {
+            // wait
+        }
+        await new Promise((resolve) => setTimeout(resolve, 250));
+    }
+    throw new Error(`Timed out waiting for ${path}`);
+}
+
+async function readJsonFile<T>(path: string): Promise<T> {
+    return JSON.parse(await Deno.readTextFile(path)) as T;
+}
+
+function pickSampleFiles(entries: DatasetEntry[]): DatasetEntry[] {
+    const unique = new Map<string, DatasetEntry>();
+    for (const entry of [entries.find((e) => e.kind === "md"), entries.find((e) => e.kind === "bin"), entries.at(-1)]) {
+        if (entry) {
+            unique.set(entry.relativePath, entry);
+        }
+    }
+    return [...unique.values()];
+}
+
+async function readLatestP2PConnectionStats(path: string): Promise<P2PConnectionStats | undefined> {
+    try {
+        const lines = (await Deno.readTextFile(path))
+            .split(/\r?\n/)
+            .map((line) => line.trim())
+            .filter((line) => line.length > 0);
+        return lines.length === 0 ? undefined : (JSON.parse(lines.at(-1)!) as P2PConnectionStats);
+    } catch {
+        return undefined;
+    }
+}
+
+function buildCommonConfig() {
+    const runId = readEnvString("BENCH_SPLIT_RUN_ID", readEnvString("BENCH_ROOM_ID", "bench-split-run"));
+    const baseWorkRoot = readEnvString("BENCH_SPLIT_WORK_ROOT", "/p2p-work");
+    return {
+        runId,
+        workRoot: join(baseWorkRoot, runId),
+        resultRoot: readEnvString("BENCH_SPLIT_RESULT_ROOT", "/workspace/src/apps/cli/testdeno/bench-results"),
+        relay: readEnvString("BENCH_RELAY", "ws://nostr-relay:7777/"),
+        appId: readEnvString("BENCH_APP_ID", "self-hosted-livesync-cli-benchmark"),
+        roomId: readEnvString("BENCH_ROOM_ID", "bench-split-room"),
+        passphrase: readEnvString("BENCH_PASSPHRASE", "bench-split-passphrase"),
+        turnServers: readEnvString("BENCH_TURN_SERVERS", ""),
+        datasetDirName: readEnvString("BENCH_DATASET_DIR", "bench-dataset"),
+        datasetSeed: readEnvString("BENCH_SEED", "livesync-benchmark-seed"),
+        mdFileCount: Math.floor(readEnvNumber("BENCH_MD_FILE_COUNT", 20)),
+        mdMinSizeBytes: Math.floor(readEnvNumber("BENCH_MD_MIN_SIZE_BYTES", 512)),
+        mdMaxSizeBytes: Math.floor(readEnvNumber("BENCH_MD_MAX_SIZE_BYTES", 2048)),
+        binFileCount: Math.floor(readEnvNumber("BENCH_BIN_FILE_COUNT", 5)),
+        binSizeBytes: Math.floor(readEnvNumber("BENCH_BIN_SIZE_BYTES", 8192)),
+        peersTimeoutSeconds: readEnvNumber("BENCH_PEERS_TIMEOUT", 60),
+        syncTimeoutSeconds: readEnvNumber("BENCH_SYNC_TIMEOUT", 300),
+        nodeTimeoutMs: readEnvNumber("BENCH_SPLIT_NODE_TIMEOUT_MS", 360_000),
+        profile: readEnvString("BENCH_NETWORK_PROFILE", readEnvString("NETEM_PROFILE", "split-compose")),
+    };
+}
+
+async function prepareP2PSettings(
+    settingsPath: string,
+    peerName: string,
+    config: ReturnType<typeof buildCommonConfig>
+) {
+    await initSettingsFile(settingsPath);
+    await applyP2pSettings(
+        settingsPath,
+        config.roomId,
+        config.passphrase,
+        config.appId,
+        config.relay,
+        "~.*",
+        config.turnServers
+    );
+    await applyP2pTestTweaks(settingsPath, peerName, config.passphrase);
+}
+
+async function runHost(): Promise<void> {
+    const config = buildCommonConfig();
+    const netem = await applyNetemIfRequested();
+    await Deno.mkdir(config.workRoot, { recursive: true });
+    await Deno.mkdir(config.resultRoot, { recursive: true });
+
+    const hostVault = join(config.workRoot, "vault-host");
+    const hostSettings = join(config.workRoot, "settings-host.json");
+    await Deno.mkdir(hostVault, { recursive: true });
+    await prepareP2PSettings(hostSettings, "p2p-split-host", config);
+
+    const seedFiles = await createDeterministicDataset({
+        rootDir: hostVault,
+        datasetDirName: config.datasetDirName,
+        seed: config.datasetSeed,
+        mdCount: config.mdFileCount,
+        mdMinSizeBytes: config.mdMinSizeBytes,
+        mdMaxSizeBytes: config.mdMaxSizeBytes,
+        binCount: config.binFileCount,
+        binSizeBytes: config.binSizeBytes,
+    });
+    await Deno.writeTextFile(
+        join(config.workRoot, "sample-files.json"),
+        JSON.stringify(pickSampleFiles(seedFiles.entries), null, 2)
+    );
+
+    const mirrorStart = nowMs();
+    await runCliOrFail(hostVault, "--settings", hostSettings, "mirror");
+    const mirrorElapsedMs = Number((nowMs() - mirrorStart).toFixed(1));
+    const hostReady: HostReady = {
+        generatedAt: new Date().toISOString(),
+        totalFiles: seedFiles.totalFiles,
+        totalBytes: seedFiles.totalBytes,
+        mdFileCount: seedFiles.mdCount,
+        binFileCount: seedFiles.binCount,
+        mirrorElapsedMs,
+        netem,
+    };
+    await Deno.writeTextFile(join(config.workRoot, "host-ready.json"), JSON.stringify(hostReady, null, 2));
+
+    const host = startCliInBackground(hostVault, "--settings", hostSettings, "p2p-host");
+    try {
+        await host.waitUntilContains("P2P host is running", 20_000);
+        await Deno.writeTextFile(
+            join(config.workRoot, "p2p-host-ready.json"),
+            JSON.stringify({ generatedAt: new Date().toISOString() })
+        );
+        await waitForFile(join(config.workRoot, "client-done.json"), config.nodeTimeoutMs);
+    } finally {
+        await host.stop();
+    }
+}
+
+async function runClient(): Promise<void> {
+    const config = buildCommonConfig();
+    const netem = await applyNetemIfRequested();
+    await Deno.mkdir(config.resultRoot, { recursive: true });
+    await waitForFile(join(config.workRoot, "host-ready.json"), config.nodeTimeoutMs);
+    await waitForFile(join(config.workRoot, "p2p-host-ready.json"), config.nodeTimeoutMs);
+
+    const clientVault = join(config.workRoot, "vault-client");
+    const clientSettings = join(config.workRoot, "settings-client.json");
+    const statsPath = join(config.workRoot, "p2p-connection-stats.jsonl");
+    await Deno.mkdir(clientVault, { recursive: true });
+    await prepareP2PSettings(clientSettings, "p2p-split-client", config);
+
+    const hostReady = await readJsonFile<HostReady>(join(config.workRoot, "host-ready.json"));
+    const timestamp = new Date().toISOString().replace(/[-:]/g, "").slice(0, 15);
+    const outputDir = join(config.resultRoot, `p2p-split-${config.profile}-${timestamp}`);
+    await Deno.mkdir(outputDir, { recursive: true });
+
+    const previousStatsPath = Deno.env.get("LIVESYNC_P2P_STATS_JSONL");
+    Deno.env.set("LIVESYNC_P2P_STATS_JSONL", statsPath);
+    let stage = "peer-discovery";
+    let peerDiscoveryCommandElapsedMs: number | undefined;
+    let syncElapsedMs: number | undefined;
+    try {
+        const peerDiscoveryCommandStart = nowMs();
+        const peer = await discoverPeer(clientVault, clientSettings, config.peersTimeoutSeconds);
+        peerDiscoveryCommandElapsedMs = Number((nowMs() - peerDiscoveryCommandStart).toFixed(1));
+
+        stage = "p2p-sync";
+        const syncStart = nowMs();
+        await runCliOrFail(
+            clientVault,
+            "--settings",
+            clientSettings,
+            "p2p-sync",
+            peer.id,
+            String(config.syncTimeoutSeconds)
+        );
+        syncElapsedMs = Number((nowMs() - syncStart).toFixed(1));
+
+        stage = "sample-verification";
+        const samples = await readJsonFile<DatasetEntry[]>(join(config.workRoot, "sample-files.json"));
+        for (const sample of samples) {
+            const pulledPath = join(config.workRoot, `pulled-${sample.relativePath.replaceAll("/", "_")}`);
+            await runCliOrFail(clientVault, "--settings", clientSettings, "pull", sample.relativePath, pulledPath);
+            await assertFilesEqual(
+                sample.absolutePath,
+                pulledPath,
+                `sample file mismatch after split sync: ${sample.relativePath}`
+            );
+        }
+
+        const p2pConnectionStats = await readLatestP2PConnectionStats(statsPath);
+        const result = {
+            ok: true,
+            generatedAt: new Date().toISOString(),
+            caseName: "p2p-split-compose",
+            mode: "p2p-split-compose-benchmark",
+            runId: config.runId,
+            simulationTier: Deno.env.get("BENCH_NETEM_ENABLED") === "1" ? "2" : "1",
+            networkProfile: config.profile,
+            networkModel:
+                Deno.env.get("BENCH_NETEM_ENABLED") === "1" ? "split-compose-egress-netem" : "split-compose-no-netem",
+            relay: config.relay,
+            turnServers: config.turnServers,
+            turnEnabled: config.turnServers.trim().length > 0,
+            p2pCandidatePathVerified: p2pConnectionStats?.candidatePathCollected === true,
+            p2pConnectionStats,
+            hostNetem: hostReady.netem,
+            clientNetem: netem,
+            totalFiles: hostReady.totalFiles,
+            totalBytes: hostReady.totalBytes,
+            mdFileCount: hostReady.mdFileCount,
+            binFileCount: hostReady.binFileCount,
+            mirrorElapsedMs: hostReady.mirrorElapsedMs,
+            peerDiscoveryTimeoutSeconds: config.peersTimeoutSeconds,
+            peerDiscoveryCommandElapsedMs,
+            syncElapsedMs,
+            throughputBytesPerSec: Number((hostReady.totalBytes / (syncElapsedMs / 1000)).toFixed(2)),
+            throughputMiBPerSec: Number((hostReady.totalBytes / (syncElapsedMs / 1000) / 1024 / 1024).toFixed(4)),
+        };
+        await Deno.writeTextFile(join(outputDir, "summary.json"), JSON.stringify(result, null, 2));
+        await Deno.writeTextFile(
+            join(config.workRoot, "client-done.json"),
+            JSON.stringify({ generatedAt: new Date().toISOString(), outputDir, ok: true })
+        );
+        console.log(JSON.stringify(result, null, 2));
+    } catch (error) {
+        const p2pConnectionStats = await readLatestP2PConnectionStats(statsPath);
+        const result = {
+            ok: false,
+            generatedAt: new Date().toISOString(),
+            caseName: "p2p-split-compose",
+            mode: "p2p-split-compose-benchmark",
+            runId: config.runId,
+            simulationTier: Deno.env.get("BENCH_NETEM_ENABLED") === "1" ? "2" : "1",
+            networkProfile: config.profile,
+            networkModel:
+                Deno.env.get("BENCH_NETEM_ENABLED") === "1" ? "split-compose-egress-netem" : "split-compose-no-netem",
+            relay: config.relay,
+            turnServers: config.turnServers,
+            turnEnabled: config.turnServers.trim().length > 0,
+            p2pCandidatePathVerified: p2pConnectionStats?.candidatePathCollected === true,
+            p2pConnectionStats,
+            hostNetem: hostReady.netem,
+            clientNetem: netem,
+            totalFiles: hostReady.totalFiles,
+            totalBytes: hostReady.totalBytes,
+            mdFileCount: hostReady.mdFileCount,
+            binFileCount: hostReady.binFileCount,
+            mirrorElapsedMs: hostReady.mirrorElapsedMs,
+            peerDiscoveryTimeoutSeconds: config.peersTimeoutSeconds,
+            peerDiscoveryCommandElapsedMs,
+            syncElapsedMs,
+            failure: {
+                stage,
+                ...errorToRecord(error),
+            },
+        };
+        await Deno.writeTextFile(join(outputDir, "summary.json"), JSON.stringify(result, null, 2));
+        await Deno.writeTextFile(
+            join(config.workRoot, "client-done.json"),
+            JSON.stringify({ generatedAt: new Date().toISOString(), outputDir, ok: false })
+        );
+        console.log(JSON.stringify(result, null, 2));
+        throw error;
+    } finally {
+        if (previousStatsPath === undefined) {
+            Deno.env.delete("LIVESYNC_P2P_STATS_JSONL");
+        } else {
+            Deno.env.set("LIVESYNC_P2P_STATS_JSONL", previousStatsPath);
+        }
+    }
+}
+
+async function main(): Promise<void> {
+    const role = readEnvString("BENCH_P2P_SPLIT_ROLE", "") as Role;
+    if (role === "host") {
+        await runHost();
+        return;
+    }
+    if (role === "client") {
+        await runClient();
+        return;
+    }
+    throw new Error("BENCH_P2P_SPLIT_ROLE must be 'host' or 'client'");
+}
+
+if (import.meta.main) {
+    main().catch((error) => {
+        console.error("[Fatal Error]", error);
+        Deno.exit(1);
+    });
+}
@@ -1,15 +1,23 @@
 import { TempDir } from "./helpers/temp.ts";
 import { applyP2pSettings, applyP2pTestTweaks, initSettingsFile } from "./helpers/settings.ts";
 import { startCliInBackground } from "./helpers/backgroundCli.ts";
-import { discoverPeer, maybeStartLocalRelay, stopLocalRelayIfStarted } from "./helpers/p2p.ts";
+import {
+    discoverPeer,
+    maybeStartCoturn,
+    maybeStartLocalRelay,
+    stopCoturnIfStarted,
+    stopLocalRelayIfStarted,
+} from "./helpers/p2p.ts";
 import { assertFilesEqual, runCliOrFail } from "./helpers/cli.ts";
 import { createDeterministicDataset, type DatasetEntry } from "./helpers/dataset.ts";

 type BenchmarkConfig = {
+    caseName: string;
    relay: string;
    appId: string;
    roomId: string;
    passphrase: string;
+    turnServers: string;
    datasetDirName: string;
    datasetSeed: string;
    mdFileCount: number;
@@ -19,6 +27,42 @@ type BenchmarkConfig = {
    binSizeBytes: number;
    peersTimeoutSeconds: number;
    syncTimeoutSeconds: number;
+    simulationTier: string;
+    networkProfile: string;
+    networkModel: string;
+    candidatePathVerification: string;
+};
+
+type P2PConnectionStats = {
+    generatedAt: string;
+    command: string;
+    peerId: string;
+    peerName: string;
+    candidatePathCollected: boolean;
+    selectedPath: string;
+    selectedPair?: {
+        id: string;
+        state: string;
+        currentRoundTripTime: number | "unknown";
+        totalRoundTripTime: number | "unknown";
+        requestsSent: number | "unknown";
+        responsesReceived: number | "unknown";
+        packetsDiscardedOnSend: number | "unknown";
+        bytesSent: number | "unknown";
+        bytesReceived: number | "unknown";
+    };
+    localCandidate?: {
+        id: string;
+        candidateType: string;
+        protocol: string;
+        relayProtocol: string;
+    };
+    remoteCandidate?: {
+        id: string;
+        candidateType: string;
+        protocol: string;
+        relayProtocol: string;
+    };
 };

 function readEnvString(name: string, fallback: string): string {
@@ -61,10 +105,12 @@ function formatBytes(value: number): string {

 function buildConfig(): BenchmarkConfig {
    return {
+        caseName: readEnvString("BENCH_CASE", "p2p-direct-local"),
        relay: readEnvString("BENCH_RELAY", "ws://localhost:4000/"),
        appId: readEnvString("BENCH_APP_ID", "self-hosted-livesync-cli-benchmark"),
        roomId: readEnvString("BENCH_ROOM_ID", `bench-room-${Date.now()}`),
        passphrase: readEnvString("BENCH_PASSPHRASE", `bench-${Date.now()}`),
+        turnServers: readEnvString("BENCH_TURN_SERVERS", ""),
        datasetDirName: readEnvString("BENCH_DATASET_DIR", "bench-dataset"),
        datasetSeed: readEnvString("BENCH_SEED", "livesync-benchmark-seed"),
        mdFileCount: Math.floor(readEnvNumber("BENCH_MD_FILE_COUNT", 1500)),
@@ -74,6 +120,10 @@ function buildConfig(): BenchmarkConfig {
        binSizeBytes: Math.floor(readEnvNumber("BENCH_BIN_SIZE_BYTES", 100 * 1024)),
        peersTimeoutSeconds: readEnvNumber("BENCH_PEERS_TIMEOUT", 20),
        syncTimeoutSeconds: readEnvNumber("BENCH_SYNC_TIMEOUT", 240),
+        simulationTier: readEnvString("BENCH_SIMULATION_TIER", "1"),
+        networkProfile: readEnvString("BENCH_NETWORK_PROFILE", "local-direct"),
+        networkModel: readEnvString("BENCH_NETWORK_MODEL", "local-runner-webrtc"),
+        candidatePathVerification: readEnvString("BENCH_P2P_CANDIDATE_PATH_VERIFICATION", "not-collected"),
    };
 }

@@ -102,18 +152,39 @@ function pickSampleFiles(entries: DatasetEntry[]): DatasetEntry[] {
    return [...unique.values()];
 }

+async function readLatestP2PConnectionStats(statsPath: string): Promise<P2PConnectionStats | undefined> {
+    try {
+        const text = await Deno.readTextFile(statsPath);
+        const lines = text
+            .split(/\r?\n/)
+            .map((line) => line.trim())
+            .filter((line) => line.length > 0);
+        if (lines.length === 0) {
+            return undefined;
+        }
+        return JSON.parse(lines[lines.length - 1]) as P2PConnectionStats;
+    } catch {
+        return undefined;
+    }
+}
+
 async function main(): Promise<void> {
    const config = buildConfig();
    const resultPath = readOptionalResultPath();

    const relayStarted = await maybeStartLocalRelay(config.relay);
+    const coturnStarted = await maybeStartCoturn(config.turnServers);
    await using workDir = await TempDir.create("livesync-cli-p2p-bench");

    const hostVault = workDir.join("vault-host");
    const clientVault = workDir.join("vault-client");
    const hostSettings = workDir.join("settings-host.json");
    const clientSettings = workDir.join("settings-client.json");
+    const p2pStatsPath = workDir.join("p2p-connection-stats.jsonl");
+    const previousStatsPath = Deno.env.get("LIVESYNC_P2P_STATS_JSONL");
+    Deno.env.set("LIVESYNC_P2P_STATS_JSONL", p2pStatsPath);

+    try {
        await Promise.all([
            Deno.mkdir(hostVault, { recursive: true }),
            Deno.mkdir(clientVault, { recursive: true }),
@@ -122,8 +193,24 @@ async function main(): Promise<void> {
        ]);

        await Promise.all([
-        applyP2pSettings(hostSettings, config.roomId, config.passphrase, config.appId, config.relay, "~.*"),
-        applyP2pSettings(clientSettings, config.roomId, config.passphrase, config.appId, config.relay, "~.*"),
+            applyP2pSettings(
+                hostSettings,
+                config.roomId,
+                config.passphrase,
+                config.appId,
+                config.relay,
+                "~.*",
+                config.turnServers
+            ),
+            applyP2pSettings(
+                clientSettings,
+                config.roomId,
+                config.passphrase,
+                config.appId,
+                config.relay,
+                "~.*",
+                config.turnServers
+            ),
        ]);

        await Promise.all([
@@ -152,9 +239,9 @@ async function main(): Promise<void> {
            await host.waitUntilContains("P2P host is running", 20000);
            const hostReadyElapsed = nowMs() - hostReadyStart;

-        const peerDiscoveryStart = nowMs();
+            const peerDiscoveryCommandStart = nowMs();
            const peer = await discoverPeer(clientVault, clientSettings, config.peersTimeoutSeconds);
-        const peerDiscoveryElapsed = nowMs() - peerDiscoveryStart;
+            const peerDiscoveryCommandElapsed = nowMs() - peerDiscoveryCommandStart;

            const syncStart = nowMs();
            await runCliOrFail(
@@ -178,9 +265,26 @@ async function main(): Promise<void> {
                );
            }

+            const p2pConnectionStats = await readLatestP2PConnectionStats(p2pStatsPath);
            const result = {
+                caseName: config.caseName,
                mode: "p2p-cli-benchmark",
                relay: config.relay,
+                turnServers: config.turnServers,
+                turnEnabled: config.turnServers.trim().length > 0,
+                simulationTier: config.simulationTier,
+                networkProfile: config.networkProfile,
+                networkModel: config.networkModel,
+                p2pCandidatePathVerified: p2pConnectionStats?.candidatePathCollected === true,
+                p2pCandidatePathVerification: p2pConnectionStats?.candidatePathCollected
+                    ? "selected ICE candidate pair collected from RTCPeerConnection.getStats"
+                    : config.candidatePathVerification,
+                p2pCandidatePathNote: p2pConnectionStats?.candidatePathCollected
+                    ? "The selected ICE candidate pair was collected by the CLI benchmark. Interpret the path from the candidate types; do not infer TURN use from configuration alone."
+                    : config.turnServers.trim().length > 0
+                      ? "TURN is configured, so the selected WebRTC path may be direct, server-reflexive, or relayed. The selected ICE candidate pair was not exported by this run."
+                      : "TURN is disabled, so a TURN-relayed path is not expected. The selected ICE candidate pair was not exported by this run.",
+                p2pConnectionStats,
                appId: config.appId,
                roomId: config.roomId,
                datasetSeed: config.datasetSeed,
@@ -193,7 +297,10 @@ async function main(): Promise<void> {
                binFileCount: seedFiles.binCount,
                mirrorElapsedMs: Number(mirrorElapsed.toFixed(1)),
                hostReadyElapsedMs: Number(hostReadyElapsed.toFixed(1)),
-            peerDiscoveryElapsedMs: Number(peerDiscoveryElapsed.toFixed(1)),
+                peerDiscoveryTimeoutSeconds: config.peersTimeoutSeconds,
+                peerDiscoveryCommandElapsedMs: Number(peerDiscoveryCommandElapsed.toFixed(1)),
+                peerDiscoveryNote:
+                    "p2p-peers waits for the requested timeout before printing discovered peers, so this is command duration, not first-peer latency.",
                syncElapsedMs: Number(syncElapsed.toFixed(1)),
                throughputBytesPerSec: Number((seedFiles.totalBytes / (syncElapsed / 1000)).toFixed(2)),
                throughputMiBPerSec: Number((seedFiles.totalBytes / (syncElapsed / 1000) / 1024 / 1024).toFixed(4)),
@@ -205,12 +312,22 @@ async function main(): Promise<void> {

            console.log(JSON.stringify(result, null, 2));
            console.error(
-            `[Benchmark] mirrored ${seedFiles.totalFiles} files (${formatBytes(seedFiles.totalBytes)}) in ${formatMs(mirrorElapsed)}, ` +
+                `[Benchmark] mirrored ${seedFiles.totalFiles} files (${formatBytes(
+                    seedFiles.totalBytes
+                )}) in ${formatMs(mirrorElapsed)}, ` +
                    `synced in ${formatMs(syncElapsed)} ` +
                    `(${result.throughputBytesPerSec} B/s, ${result.throughputMiBPerSec} MiB/s)`
            );
        } finally {
            await host.stop();
+        }
+    } finally {
+        if (previousStatsPath === undefined) {
+            Deno.env.delete("LIVESYNC_P2P_STATS_JSONL");
+        } else {
+            Deno.env.set("LIVESYNC_P2P_STATS_JSONL", previousStatsPath);
+        }
+        await stopCoturnIfStarted(coturnStarted);
        await stopLocalRelayIfStarted(relayStarted);
    }
 }
@@ -17,6 +17,9 @@
        "test:p2p-upload-download": "deno test --env-file=.test.env -A --no-check test-p2p-upload-download-repro.ts",
        "bench:p2p": "deno run --env-file=.test.env -A --no-check bench-p2p.ts",
        "bench:couchdb": "deno run --env-file=.test.env -A --no-check bench-couchdb.ts",
+        "bench:cases": "deno run --env-file=.test.env -A --no-check bench-network-cases.ts",
+        "bench:latency-sweep": "deno run --env-file=.test.env -A --no-check bench-latency-sweep.ts",
+        "bench:p2p-split-node": "deno run --env-file=.test.env -A --no-check bench-p2p-split-node.ts",
        "bench:item1": "bash ./bench-run-item1.sh",
        "bench:item1:full": "BENCH_MD_FILE_COUNT=1500 BENCH_MD_MIN_SIZE_BYTES=1024 BENCH_MD_MAX_SIZE_BYTES=20480 BENCH_BIN_FILE_COUNT=500 BENCH_BIN_SIZE_BYTES=102400 BENCH_COUCHDB_RTT_MS=50 bash ./bench-run-item1.sh",
        "test:e2e-couchdb": "deno test --env-file=.test.env -A --no-check test-e2e-two-vaults-couchdb.ts",
@@ -9,7 +9,7 @@ function sleep(ms: number): Promise<void> {
 }

 async function connectWithTimeout(hostname: string, port: number, timeoutMs: number): Promise<void> {
-    let timer: number | undefined;
+    let timer: ReturnType<typeof setTimeout> | undefined;
    try {
        const connPromise = Deno.connect({ hostname, port });
        const timeoutPromise = new Promise<never>((_, reject) => {
@@ -76,8 +76,10 @@ export async function discoverPeer(
 }

 export async function maybeStartLocalRelay(relay: string): Promise<boolean> {
-    if (!isLocalP2pRelay(relay)) return false;
+    const shouldStart = isLocalP2pRelay(relay);
+    if (shouldStart) {
        await startP2pRelay();
+    }
    const endpoint = parseRelayEndpoint(relay);
    await waitForPort(endpoint.hostname, endpoint.port, {
        timeoutMs: Number(Deno.env.get("LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS") ?? "15000"),
@@ -86,8 +88,10 @@ export async function maybeStartLocalRelay(relay: string): Promise<boolean> {
    });
    // Docker proxy accepts TCP connections instantly before the container's internal process is fully ready.
    // Wait an additional few seconds to ensure strfry is actually accepting WebSockets.
+    if (shouldStart) {
        await sleep(3000);
-    return true;
+    }
+    return shouldStart;
 }

 export async function stopLocalRelayIfStarted(started: boolean): Promise<void> {
@@ -1,7 +1,7 @@
 {
    "name": "livesync-webapp",
    "private": true,
-    "version": "0.25.79-webapp",
+    "version": "0.25.80-webapp",
    "type": "module",
    "description": "Browser-based Self-hosted LiveSync using FileSystem API",
    "scripts": {
@@ -1,7 +1,7 @@
 {
    "name": "webpeer",
    "private": true,
-    "version": "0.25.79-webpeer",
+    "version": "0.25.80-webpeer",
    "type": "module",
    "scripts": {
        "dev": "vite",
@@ -0,0 +1 @@
+bench-results/
@@ -0,0 +1,8 @@
+FROM alpine:3.22
+
+RUN apk add --no-cache iproute2
+
+COPY test/bench-network/netem-smoke.sh /usr/local/bin/livesync-netem-smoke
+RUN chmod +x /usr/local/bin/livesync-netem-smoke
+
+CMD ["livesync-netem-smoke"]
@@ -0,0 +1,35 @@
+# syntax=docker/dockerfile:1
+
+FROM node:24-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates curl unzip python3 make g++ iproute2 \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV DENO_INSTALL=/usr/local
+RUN curl -fsSL https://deno.land/install.sh | sh
+
+WORKDIR /workspace
+
+COPY package.json package-lock.json ./
+COPY src/apps/cli/package.json ./src/apps/cli/package.json
+COPY src/apps/webapp/package.json ./src/apps/webapp/package.json
+COPY src/apps/webpeer/package.json ./src/apps/webpeer/package.json
+RUN npm ci
+
+COPY . .
+RUN npm run build -w self-hosted-livesync-cli
+
+WORKDIR /workspace/src/apps/cli/testdeno
+
+RUN deno cache --lock=deno.lock \
+    bench-network-cases.ts \
+    bench-latency-sweep.ts \
+    bench-p2p-split-node.ts \
+    bench-p2p.ts \
+    bench-couchdb.ts
+
+COPY test/bench-network/run-bench.sh /usr/local/bin/run-livesync-bench
+RUN chmod +x /usr/local/bin/run-livesync-bench
+
+CMD ["run-livesync-bench"]
@@ -0,0 +1,10 @@
+# syntax=docker/dockerfile:1
+
+FROM alpine:3.22
+
+RUN apk add --no-cache iproute2 socat
+
+COPY test/bench-network/netem-tcp-shim.sh /usr/local/bin/livesync-netem-tcp-shim
+RUN chmod +x /usr/local/bin/livesync-netem-tcp-shim
+
+CMD ["livesync-netem-tcp-shim"]
@@ -0,0 +1,263 @@
+# Network benchmark package
+
+This directory packages the CLI benchmark cases with Docker Compose. It is
+intended for reproducible local benchmark runs where CouchDB, the Nostr
+signalling relay, optional TURN, and the benchmark runner are fixed by the
+Compose file.
+
+## Quick smoke run
+
+From the repository root:
+
+```bash
+docker compose -f test/bench-network/compose.yml run --rm bench-runner
+```
+
+By default this runs:
+
+- `couchdb-baseline`
+- `p2p-direct-local`
+
+The dataset is intentionally small by default. Results are written to
+`test/bench-network/bench-results/`.
+
+## GitHub Actions smoke run
+
+`.github/workflows/cli-p2p-compose-smoke.yml` provides a manual
+`workflow_dispatch` smoke run for the same Compose package. It is intentionally
+not a required check yet, because WebRTC peer discovery can still be slow or
+environment-sensitive on GitHub-hosted runners. Keep the dataset small and use
+the uploaded JSON artefact to inspect whether failures are caused by peer
+discovery, synchronisation, CouchDB startup, or Docker networking.
+
+## Select cases
+
+```bash
+BENCH_CASES=couchdb-baseline,p2p-direct-local,p2p-user-turn \
+docker compose -f test/bench-network/compose.yml --profile turn run --rm bench-runner
+```
+
+Available local cases:
+
+- `couchdb-baseline`
+- `p2p-direct-local`
+- `couchdb-tethering-vpn-proxy`
+- `couchdb-netem-home-wifi`
+- `couchdb-netem-tethering-vpn`
+- `p2p-smartphone-vpn-direct`
+- `p2p-user-turn`
+
+Set `BENCH_REPEAT_COUNT` to run each selected case more than once. Repeated
+results are written with suffixes such as `-r01`, `-r02`, and `-r03`, and the
+summary records the repeat index for each run.
+
+`p2p-smartphone-vpn-direct` is a structural case name. When it is run inside
+this Compose package it is not a real smartphone tethering/VPN measurement; it
+uses the local Compose network. Use it only for wiring checks unless the runner
+is executed in an actual tethered/VPN environment.
+
+## Comparison model
+
+The primary local comparison is between a remote-database path and a direct P2P
+path:
+
+| Case               | Data path                                   | What is measured                                                               | What is not measured                                                                                      |
+| ------------------ | ------------------------------------------- | ------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------- |
+| `couchdb-baseline` | Device A -> CouchDB -> Device B             | Two one-shot CLI synchronisation commands through a local HTTP latency proxy   | Real WAN jitter, packet loss, bandwidth limits, VPN encapsulation, and server contention                  |
+| `p2p-direct-local` | Device A -> Device B after Nostr signalling | One CLI P2P synchronisation command over WebRTC DataChannel with TURN disabled | Public relay operation, mobile carrier behaviour, TURN relay throughput, and first-peer discovery latency |
+
+Use the CouchDB result as the remote-store baseline and the P2P result as the
+direct-transfer comparison. The Nostr relay is used for signalling in the P2P
+case, but synchronised note content is transferred over the WebRTC DataChannel.
+The P2P result JSON records the selected WebRTC ICE candidate pair when the CLI
+can collect it from `RTCPeerConnection.getStats()`. Interpret P2P paths from
+the recorded candidate types rather than from TURN configuration alone. Do not
+report P2P runs as Tier 2 constrained-network measurements until host and
+client are captured under an equivalent shaped topology.
+
+## Dataset and latency controls
+
+```bash
+BENCH_MD_FILE_COUNT=100 \
+BENCH_MD_MIN_SIZE_BYTES=512 \
+BENCH_MD_MAX_SIZE_BYTES=2048 \
+BENCH_BIN_FILE_COUNT=25 \
+BENCH_BIN_SIZE_BYTES=8192 \
+BENCH_COUCHDB_RTT_MS=20 \
+BENCH_PEERS_TIMEOUT=60 \
+docker compose -f test/bench-network/compose.yml run --rm bench-runner
+```
+
+The current CouchDB latency model is the existing HTTP proxy inside
+`bench-couchdb.ts`. It models a remote database path with additional request
+latency, but it does not model packet loss, jitter, MTU, bandwidth limits,
+bufferbloat, or VPN encapsulation.
+
+For P2P runs, `BENCH_PEERS_TIMEOUT` is passed to `p2p-peers`. That command waits
+for the requested observation window before printing discovered peers, so the
+reported peer discovery command time should not be read as first-peer latency.
+
+## Latency sweep
+
+To run P2P once and CouchDB at several requested RTT values:
+
+```bash
+BENCH_COMMAND=latency-sweep \
+BENCH_SWEEP_RTT_MS=20,50,100,150,300 \
+BENCH_MD_FILE_COUNT=100 \
+BENCH_MD_MIN_SIZE_BYTES=512 \
+BENCH_MD_MAX_SIZE_BYTES=2048 \
+BENCH_BIN_FILE_COUNT=25 \
+BENCH_BIN_SIZE_BYTES=8192 \
+BENCH_SYNC_TIMEOUT=300 \
+BENCH_PEERS_TIMEOUT=60 \
+docker compose -f test/bench-network/compose.yml run --rm bench-runner
+```
+
+This sweep is useful for finding where the remote CouchDB path falls behind the
+local direct P2P path in the current HTTP-proxy latency model. It should not be
+presented as a full smartphone/VPN model.
+
+## Network emulation smoke
+
+The optional `netem` profile checks whether a Linux runner can apply traffic
+shaping inside a Compose-managed container. This is a fixture smoke test for a
+second-tier simulation design; it does not produce synchronisation performance
+results by itself.
+
+```bash
+docker compose -f test/bench-network/compose.yml --profile netem run --rm netem-smoke
+```
+
+The smoke writes `tc qdisc`, route, and interface details under
+`test/bench-network/bench-results/`. Profile parameters can be overridden:
+
+```bash
+NETEM_PROFILE=tethering-vpn \
+NETEM_DELAY_MS=140 \
+NETEM_JITTER_MS=50 \
+NETEM_LOSS_PERCENT=1.0 \
+NETEM_BANDWIDTH_MBIT=10 \
+NETEM_MTU=1380 \
+docker compose -f test/bench-network/compose.yml --profile netem run --rm netem-smoke
+```
+
+## Split-container P2P emulation
+
+The optional `p2p-split` profile runs the P2P host and client in separate
+Compose services. Each service can apply `tc netem` to its own egress interface
+and the client result records the selected WebRTC ICE candidate pair.
+
+```bash
+BENCH_MD_FILE_COUNT=2 \
+BENCH_BIN_FILE_COUNT=1 \
+BENCH_PEERS_TIMEOUT=10 \
+BENCH_SPLIT_RUN_ID="$(date -u +%Y%m%d%H%M%S)" \
+docker compose -f test/bench-network/compose.yml --profile p2p-split up \
+  --abort-on-container-exit --exit-code-from p2p-split-client \
+  p2p-split-host p2p-split-client
+```
+
+By default this uses the `home-wifi` profile (`20 ms` delay, `5 ms` jitter,
+`0.1%` loss, `100 Mbit`, and `1500` MTU) on both P2P containers. Override the
+same `NETEM_*` variables used by the TCP shim to model a stricter profile.
+
+```bash
+BENCH_MD_FILE_COUNT=100 \
+BENCH_MD_MIN_SIZE_BYTES=512 \
+BENCH_MD_MAX_SIZE_BYTES=2048 \
+BENCH_BIN_FILE_COUNT=25 \
+BENCH_BIN_SIZE_BYTES=8192 \
+BENCH_PEERS_TIMEOUT=60 \
+BENCH_SYNC_TIMEOUT=420 \
+BENCH_SPLIT_RUN_ID="$(date -u +%Y%m%d%H%M%S)" \
+BENCH_NETWORK_PROFILE=tethering-vpn \
+NETEM_PROFILE=tethering-vpn \
+NETEM_DELAY_MS=140 \
+NETEM_JITTER_MS=50 \
+NETEM_LOSS_PERCENT=1.0 \
+NETEM_BANDWIDTH_MBIT=10 \
+NETEM_MTU=1380 \
+docker compose -f test/bench-network/compose.yml --profile p2p-split up \
+  --abort-on-container-exit --exit-code-from p2p-split-client \
+  p2p-split-host p2p-split-client
+```
+
+This is a Linux-only manual benchmark fixture, not a required pull-request CI
+job. It shapes each P2P container's egress path, including signalling traffic,
+and should be reported separately from the CouchDB TCP-shim measurements. The
+result JSON includes `ok: true` for completed runs; failed runs still write a
+summary with `ok: false` and a `failure` object before returning a non-zero
+exit code.
+
+Remove the shared work volume between repeated manual runs when you do not use
+a unique `BENCH_SPLIT_RUN_ID`:
+
+```bash
+docker compose -f test/bench-network/compose.yml --profile p2p-split down --volumes
+```
+
+## P2P Signalling-Only Emulation
+
+The optional `signalling-shim` profile shapes only the Nostr signalling relay
+path. The P2P host and client run in the benchmark runner as usual, and the
+configured relay URL points at a TCP netem shim in front of `nostr-relay`.
+This is the preferred fixture when evaluating the hypothesis that P2P avoids a
+constrained remote database data path while still depending on a signalling
+server for rendezvous.
+
+```bash
+BENCH_CASES=p2p-signalling-netem-home-wifi \
+docker compose -f test/bench-network/compose.yml --profile signalling-shim run --rm \
+  bench-runner-signalling-shim
+```
+
+For a stricter signalling path:
+
+```bash
+NETEM_PROFILE=tethering-vpn \
+NETEM_DELAY_MS=140 \
+NETEM_JITTER_MS=50 \
+NETEM_LOSS_PERCENT=1.0 \
+NETEM_BANDWIDTH_MBIT=10 \
+NETEM_MTU=1380 \
+BENCH_CASES=p2p-signalling-netem-tethering-vpn \
+docker compose -f test/bench-network/compose.yml --profile signalling-shim run --rm \
+  bench-runner-signalling-shim
+```
+
+Use this separately from `p2p-split`. The `p2p-split` profile shapes each peer's
+egress path, so it constrains both signalling and the selected WebRTC data
+path. The `signalling-shim` profile constrains only relay access, which keeps
+it focused on peer-to-signalling-server reachability rather than peer-to-peer
+note-data transfer.
+
+## Shimmed CouchDB benchmark
+
+The optional `shim` profile runs a CouchDB benchmark through a TCP forwarding
+container that applies `tc netem`. This is a manual Tier 2 synchronisation
+measurement path; it is intentionally separate from required pull-request CI.
+
+```bash
+docker compose -f test/bench-network/compose.yml --profile shim run --rm bench-runner-shim
+```
+
+The default profile is `home-wifi`. A smartphone/VPN-like profile can be
+requested by overriding both the shim parameters and the benchmark case:
+
+```bash
+NETEM_PROFILE=tethering-vpn \
+NETEM_DELAY_MS=140 \
+NETEM_JITTER_MS=50 \
+NETEM_LOSS_PERCENT=1.0 \
+NETEM_BANDWIDTH_MBIT=10 \
+NETEM_MTU=1380 \
+BENCH_CASES=couchdb-netem-tethering-vpn \
+docker compose -f test/bench-network/compose.yml --profile shim run --rm bench-runner-shim
+```
+
+The benchmark result records `simulationTier`, `networkProfile`, and
+`networkModel`. The shim also writes its applied `tc qdisc`, route, and
+interface state under `test/bench-network/bench-results/`.
+This shim currently measures the CouchDB path only. It does not shape or verify
+the WebRTC P2P data path.
@@ -0,0 +1,329 @@
+services:
+  couchdb:
+    image: couchdb:3.5.0
+    environment:
+      COUCHDB_USER: ${BENCH_COUCHDB_USER:-admin}
+      COUCHDB_PASSWORD: ${BENCH_COUCHDB_PASSWORD:-testpassword}
+      COUCHDB_SINGLE_NODE: "true"
+    healthcheck:
+      test:
+        [
+          "CMD-SHELL",
+          "curl -fsS -u ${BENCH_COUCHDB_USER:-admin}:${BENCH_COUCHDB_PASSWORD:-testpassword} http://127.0.0.1:5984/_up >/dev/null",
+        ]
+      interval: 2s
+      timeout: 5s
+      retries: 30
+
+  nostr-relay:
+    image: ghcr.io/hoytech/strfry:latest
+    entrypoint: sh
+    command:
+      - -lc
+      - |
+        cat > /tmp/strfry.conf <<'EOF'
+        db = "./strfry-db/"
+
+        relay {
+          bind = "0.0.0.0"
+          port = 7777
+          nofiles = 65536
+
+          info {
+            name = "livesync bench relay"
+            description = "local relay for livesync compose benchmarks"
+          }
+
+          maxWebsocketPayloadSize = 131072
+          autoPingSeconds = 55
+
+          writePolicy {
+            plugin = ""
+          }
+        }
+        EOF
+        exec /app/strfry --config /tmp/strfry.conf relay
+    tmpfs:
+      - /app/strfry-db:rw,size=256m
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 7777"]
+      interval: 2s
+      timeout: 5s
+      retries: 30
+
+  coturn:
+    image: coturn/coturn:latest
+    command:
+      - --log-file=stdout
+      - --listening-port=3478
+      - --user=${BENCH_TURN_USERNAME:-testuser}:${BENCH_TURN_CREDENTIAL:-testpass}
+      - --realm=${BENCH_TURN_REALM:-livesync.test}
+    profiles:
+      - turn
+
+  bench-runner:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    depends_on:
+      couchdb:
+        condition: service_healthy
+      nostr-relay:
+        condition: service_healthy
+    environment:
+      BENCH_COMMAND: ${BENCH_COMMAND:-cases}
+      BENCH_CASES: ${BENCH_CASES:-couchdb-baseline,p2p-direct-local}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
+      BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_SWEEP_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_SWEEP_RTT_MS: ${BENCH_SWEEP_RTT_MS:-20,50,100,150,300}
+      BENCH_SWEEP_INCLUDE_P2P: ${BENCH_SWEEP_INCLUDE_P2P:-true}
+      BENCH_COUCHDB_MANAGED: "false"
+      BENCH_COUCHDB_BACKEND_URI: http://couchdb:5984
+      BENCH_COUCHDB_URI: http://127.0.0.1:15989
+      BENCH_COUCHDB_USER: ${BENCH_COUCHDB_USER:-admin}
+      BENCH_COUCHDB_PASSWORD: ${BENCH_COUCHDB_PASSWORD:-testpassword}
+      BENCH_RELAY: ws://nostr-relay:7777/
+      BENCH_LOCAL_TURN_SERVERS: turn:coturn:3478
+      BENCH_MD_FILE_COUNT: ${BENCH_MD_FILE_COUNT:-20}
+      BENCH_MD_MIN_SIZE_BYTES: ${BENCH_MD_MIN_SIZE_BYTES:-512}
+      BENCH_MD_MAX_SIZE_BYTES: ${BENCH_MD_MAX_SIZE_BYTES:-2048}
+      BENCH_BIN_FILE_COUNT: ${BENCH_BIN_FILE_COUNT:-5}
+      BENCH_BIN_SIZE_BYTES: ${BENCH_BIN_SIZE_BYTES:-8192}
+      BENCH_COUCHDB_RTT_MS: ${BENCH_COUCHDB_RTT_MS:-20}
+      BENCH_TETHERING_VPN_RTT_MS: ${BENCH_TETHERING_VPN_RTT_MS:-120}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_PEERS_TIMEOUT: ${BENCH_PEERS_TIMEOUT:-60}
+      LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: ${LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS:-60000}
+      BENCH_LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
+  couchdb-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.shim
+    profiles:
+      - shim
+    depends_on:
+      couchdb:
+        condition: service_healthy
+    cap_add:
+      - NET_ADMIN
+    environment:
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      NETEM_RESULT_ROOT: /bench-results
+      SHIM_LISTEN_PORT: 5984
+      SHIM_TARGET_HOST: couchdb
+      SHIM_TARGET_PORT: 5984
+    volumes:
+      - ./bench-results:/bench-results
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 5984"]
+      interval: 2s
+      timeout: 5s
+      retries: 30
+
+  bench-runner-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    profiles:
+      - shim
+    depends_on:
+      couchdb-shim:
+        condition: service_healthy
+    environment:
+      BENCH_COMMAND: ${BENCH_COMMAND:-cases}
+      BENCH_CASES: ${BENCH_CASES:-couchdb-netem-home-wifi}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
+      BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_SWEEP_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_COUCHDB_MANAGED: "false"
+      BENCH_COUCHDB_BACKEND_URI: http://couchdb-shim:5984
+      BENCH_SHIM_COUCHDB_URI: http://couchdb-shim:5984
+      BENCH_COUCHDB_URI: http://127.0.0.1:15989
+      BENCH_COUCHDB_USER: ${BENCH_COUCHDB_USER:-admin}
+      BENCH_COUCHDB_PASSWORD: ${BENCH_COUCHDB_PASSWORD:-testpassword}
+      BENCH_MD_FILE_COUNT: ${BENCH_MD_FILE_COUNT:-20}
+      BENCH_MD_MIN_SIZE_BYTES: ${BENCH_MD_MIN_SIZE_BYTES:-512}
+      BENCH_MD_MAX_SIZE_BYTES: ${BENCH_MD_MAX_SIZE_BYTES:-2048}
+      BENCH_BIN_FILE_COUNT: ${BENCH_BIN_FILE_COUNT:-5}
+      BENCH_BIN_SIZE_BYTES: ${BENCH_BIN_SIZE_BYTES:-8192}
+      BENCH_COUCHDB_RTT_MS: ${BENCH_COUCHDB_RTT_MS:-1}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
+  p2p-signalling-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.shim
+    profiles:
+      - signalling-shim
+    depends_on:
+      nostr-relay:
+        condition: service_healthy
+    cap_add:
+      - NET_ADMIN
+    environment:
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      NETEM_RESULT_ROOT: /bench-results
+      SHIM_LISTEN_PORT: 7777
+      SHIM_TARGET_HOST: nostr-relay
+      SHIM_TARGET_PORT: 7777
+    volumes:
+      - ./bench-results:/bench-results
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 7777"]
+      interval: 2s
+      timeout: 5s
+      retries: 30
+
+  bench-runner-signalling-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    profiles:
+      - signalling-shim
+    depends_on:
+      p2p-signalling-shim:
+        condition: service_healthy
+    environment:
+      BENCH_COMMAND: ${BENCH_COMMAND:-cases}
+      BENCH_CASES: ${BENCH_CASES:-p2p-signalling-netem-home-wifi}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
+      BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_SIGNAL_SHIM_RELAY: ws://p2p-signalling-shim:7777/
+      BENCH_MD_FILE_COUNT: ${BENCH_MD_FILE_COUNT:-20}
+      BENCH_MD_MIN_SIZE_BYTES: ${BENCH_MD_MIN_SIZE_BYTES:-512}
+      BENCH_MD_MAX_SIZE_BYTES: ${BENCH_MD_MAX_SIZE_BYTES:-2048}
+      BENCH_BIN_FILE_COUNT: ${BENCH_BIN_FILE_COUNT:-5}
+      BENCH_BIN_SIZE_BYTES: ${BENCH_BIN_SIZE_BYTES:-8192}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_PEERS_TIMEOUT: ${BENCH_PEERS_TIMEOUT:-60}
+      LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: ${LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS:-60000}
+      BENCH_LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
+  p2p-split-host:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    profiles:
+      - p2p-split
+    depends_on:
+      nostr-relay:
+        condition: service_healthy
+    cap_add:
+      - NET_ADMIN
+    environment:
+      BENCH_COMMAND: p2p-split-node
+      BENCH_P2P_SPLIT_ROLE: host
+      BENCH_SPLIT_RUN_ID: ${BENCH_SPLIT_RUN_ID:-bench-split-run}
+      BENCH_SPLIT_WORK_ROOT: /p2p-work
+      BENCH_SPLIT_RESULT_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_RELAY: ws://nostr-relay:7777/
+      BENCH_APP_ID: ${BENCH_APP_ID:-self-hosted-livesync-cli-benchmark}
+      BENCH_ROOM_ID: ${BENCH_ROOM_ID:-bench-split-room}
+      BENCH_PASSPHRASE: ${BENCH_PASSPHRASE:-bench-split-passphrase}
+      BENCH_TURN_SERVERS: ${BENCH_TURN_SERVERS:-}
+      BENCH_MD_FILE_COUNT: ${BENCH_MD_FILE_COUNT:-20}
+      BENCH_MD_MIN_SIZE_BYTES: ${BENCH_MD_MIN_SIZE_BYTES:-512}
+      BENCH_MD_MAX_SIZE_BYTES: ${BENCH_MD_MAX_SIZE_BYTES:-2048}
+      BENCH_BIN_FILE_COUNT: ${BENCH_BIN_FILE_COUNT:-5}
+      BENCH_BIN_SIZE_BYTES: ${BENCH_BIN_SIZE_BYTES:-8192}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_PEERS_TIMEOUT: ${BENCH_PEERS_TIMEOUT:-60}
+      BENCH_NETEM_ENABLED: ${BENCH_NETEM_ENABLED:-1}
+      BENCH_NETWORK_PROFILE: ${BENCH_NETWORK_PROFILE:-home-wifi}
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: ${LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS:-60000}
+      LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - p2p-split-work:/p2p-work
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
+  p2p-split-client:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    profiles:
+      - p2p-split
+    depends_on:
+      nostr-relay:
+        condition: service_healthy
+      p2p-split-host:
+        condition: service_started
+    cap_add:
+      - NET_ADMIN
+    environment:
+      BENCH_COMMAND: p2p-split-node
+      BENCH_P2P_SPLIT_ROLE: client
+      BENCH_SPLIT_RUN_ID: ${BENCH_SPLIT_RUN_ID:-bench-split-run}
+      BENCH_SPLIT_WORK_ROOT: /p2p-work
+      BENCH_SPLIT_RESULT_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_RELAY: ws://nostr-relay:7777/
+      BENCH_APP_ID: ${BENCH_APP_ID:-self-hosted-livesync-cli-benchmark}
+      BENCH_ROOM_ID: ${BENCH_ROOM_ID:-bench-split-room}
+      BENCH_PASSPHRASE: ${BENCH_PASSPHRASE:-bench-split-passphrase}
+      BENCH_TURN_SERVERS: ${BENCH_TURN_SERVERS:-}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_PEERS_TIMEOUT: ${BENCH_PEERS_TIMEOUT:-60}
+      BENCH_NETEM_ENABLED: ${BENCH_NETEM_ENABLED:-1}
+      BENCH_NETWORK_PROFILE: ${BENCH_NETWORK_PROFILE:-home-wifi}
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: ${LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS:-60000}
+      LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - p2p-split-work:/p2p-work
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
+  netem-smoke:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.netem
+    profiles:
+      - netem
+    cap_add:
+      - NET_ADMIN
+    environment:
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      NETEM_RESULT_ROOT: /bench-results
+    volumes:
+      - ./bench-results:/bench-results
+
+volumes:
+  p2p-split-work:
@@ -0,0 +1,71 @@
+#!/usr/bin/env sh
+set -eu
+
+profile="${NETEM_PROFILE:-home-wifi}"
+iface="${NETEM_INTERFACE:-eth0}"
+delay_ms="${NETEM_DELAY_MS:-20}"
+jitter_ms="${NETEM_JITTER_MS:-5}"
+loss_percent="${NETEM_LOSS_PERCENT:-0.1}"
+bandwidth_mbit="${NETEM_BANDWIDTH_MBIT:-100}"
+mtu="${NETEM_MTU:-1500}"
+out_root="${NETEM_RESULT_ROOT:-/bench-results}"
+timestamp="$(date -u +%Y%m%d-%H%M%S)"
+out_dir="${out_root}/netem-smoke-${timestamp}"
+out_file="${out_dir}/summary.json"
+
+mkdir -p "$out_dir"
+
+if ! ip link show "$iface" >/dev/null 2>&1; then
+    echo "Network interface '$iface' was not found" >&2
+    ip addr >&2
+    exit 2
+fi
+
+ip link set dev "$iface" mtu "$mtu"
+tc qdisc del dev "$iface" root >/dev/null 2>&1 || true
+tc qdisc add dev "$iface" root netem \
+    delay "${delay_ms}ms" "${jitter_ms}ms" \
+    loss "${loss_percent}%" \
+    rate "${bandwidth_mbit}mbit"
+
+json_lines() {
+    awk '
+        {
+            gsub(/\\/, "\\\\");
+            gsub(/"/, "\\\"");
+            printf "%s    \"%s\"", (NR == 1 ? "" : ",\n"), $0;
+        }
+    '
+}
+
+ip_addr="$(ip addr show "$iface" | json_lines)"
+ip_route="$(ip route | json_lines)"
+tc_qdisc="$(tc qdisc show dev "$iface" | json_lines)"
+
+cat > "$out_file" <<EOF
+{
+  "simulationTier": 2,
+  "mode": "netem-smoke",
+  "profile": "$profile",
+  "interface": "$iface",
+  "netem": {
+    "delayMs": $delay_ms,
+    "jitterMs": $jitter_ms,
+    "lossPercent": $loss_percent,
+    "bandwidthMbit": $bandwidth_mbit,
+    "mtu": $mtu
+  },
+  "ipAddr": [
+$ip_addr
+  ],
+  "ipRoute": [
+$ip_route
+  ],
+  "tcQdisc": [
+$tc_qdisc
+  ]
+}
+EOF
+
+cat "$out_file"
+echo "[netem-smoke] result file: $out_file"
@@ -0,0 +1,80 @@
+#!/usr/bin/env sh
+set -eu
+
+profile="${NETEM_PROFILE:-home-wifi}"
+iface="${NETEM_INTERFACE:-eth0}"
+delay_ms="${NETEM_DELAY_MS:-20}"
+jitter_ms="${NETEM_JITTER_MS:-5}"
+loss_percent="${NETEM_LOSS_PERCENT:-0.1}"
+bandwidth_mbit="${NETEM_BANDWIDTH_MBIT:-100}"
+mtu="${NETEM_MTU:-1500}"
+listen_port="${SHIM_LISTEN_PORT:-5984}"
+target_host="${SHIM_TARGET_HOST:-couchdb}"
+target_port="${SHIM_TARGET_PORT:-5984}"
+out_root="${NETEM_RESULT_ROOT:-/bench-results}"
+timestamp="$(date -u +%Y%m%d-%H%M%S)"
+out_dir="${out_root}/netem-shim-${profile}-${timestamp}"
+out_file="${out_dir}/summary.json"
+
+json_lines() {
+    awk '
+        {
+            gsub(/\\/, "\\\\");
+            gsub(/"/, "\\\"");
+            printf "%s    \"%s\"", (NR == 1 ? "" : ",\n"), $0;
+        }
+    '
+}
+
+mkdir -p "$out_dir"
+
+if ! ip link show "$iface" >/dev/null 2>&1; then
+    echo "Network interface '$iface' was not found" >&2
+    ip addr >&2
+    exit 2
+fi
+
+ip link set dev "$iface" mtu "$mtu"
+tc qdisc del dev "$iface" root >/dev/null 2>&1 || true
+tc qdisc add dev "$iface" root netem \
+    delay "${delay_ms}ms" "${jitter_ms}ms" \
+    loss "${loss_percent}%" \
+    rate "${bandwidth_mbit}mbit"
+
+ip_addr="$(ip addr show "$iface" | json_lines)"
+ip_route="$(ip route | json_lines)"
+tc_qdisc="$(tc qdisc show dev "$iface" | json_lines)"
+
+cat > "$out_file" <<EOF
+{
+  "simulationTier": 2,
+  "mode": "netem-tcp-shim",
+  "profile": "$profile",
+  "interface": "$iface",
+  "listenPort": $listen_port,
+  "targetHost": "$target_host",
+  "targetPort": $target_port,
+  "netem": {
+    "delayMs": $delay_ms,
+    "jitterMs": $jitter_ms,
+    "lossPercent": $loss_percent,
+    "bandwidthMbit": $bandwidth_mbit,
+    "mtu": $mtu
+  },
+  "ipAddr": [
+$ip_addr
+  ],
+  "ipRoute": [
+$ip_route
+  ],
+  "tcQdisc": [
+$tc_qdisc
+  ]
+}
+EOF
+
+cat "$out_file"
+echo "[netem-shim] forwarding 0.0.0.0:${listen_port} to ${target_host}:${target_port}"
+echo "[netem-shim] result file: $out_file"
+
+exec socat "TCP-LISTEN:${listen_port},fork,reuseaddr" "TCP:${target_host}:${target_port}"
@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+set -eu
+
+case "${BENCH_COMMAND:-cases}" in
+  cases)
+    exec deno task bench:cases
+    ;;
+  latency-sweep)
+    exec deno task bench:latency-sweep
+    ;;
+  p2p-split-node)
+    exec deno task bench:p2p-split-node
+    ;;
+  *)
+    echo "Unknown BENCH_COMMAND: ${BENCH_COMMAND}" >&2
+    echo "Expected one of: cases, latency-sweep, p2p-split-node" >&2
+    exit 2
+    ;;
+esac
@@ -3,7 +3,9 @@ Since 19th July, 2025 (beta1 in 0.25.0-beta1, 13th July, 2025)

 The head note of 0.25 is now in [updates_old.md](https://github.com/vrtmrz/obsidian-livesync/blob/main/updates_old.md). Because 0.25 got a lot of updates, thankfully, compatibility is kept and we do not need breaking changes! In other words, when get enough stabled. The next version will be v1.0.0. Even though it my hope.

-## Unreleased
+## 0.25.80
+
+7th July, 2026

 ### Fixed

@@ -110,41 +112,5 @@ Also, this update is a very large one, even if we had a lot of time, and we had
 - Some dependencies have been updated.
 - Now we check the compatibility with iOS 15 in the CI tests to ensure the plugin continues to work on older iOS versions even after we upgrade some dependencies.

-## 0.25.74
-
-8th June, 2026
-
-### Fixed
-
- Fixed an issue where disabling hidden file synchronisation did not take effect, allowing non-target hidden files to continue to be processed and synchronised by replication or boot-sequence scan (#941).
- Prevented the automatic merging of conflicted revisions when one of the revisions has been deleted, which was causing deleted files to reappear (#911).
- The startup sequence now saves the state more effectively (Thank you so much for @bmcyver)!
-
-## Only CLI
-
-8th June, 2026
-
-I should also consider the version numbering for the CLI...
-
-### Improved
-
- Added new remote database management commands: `remote-status`, `unlock-remote`, `lock-remote`, and `mark-resolved`.
- --vault option is now available for daemon and mirror commands! (Thank you so much for @starskyzheng)!
- Decoupled the database directory path from the actual vault directory path using the `--vault` (or `-V`) option.
-
-### Fixed (preventive)
-
- Validated that the specified vault path exists and is indeed a directory before starting the CLI.
- Integrated path resolution and validations for one-off commands (such as `'push'`, `'pull'`, `'cat'`, `'rm'`, `'info'`, and `'resolve'`) against the decoupled vault path instead of the database path.
-
-## 0.25.73
-
-4th June, 2026
-
-### Fixed
-
- Adjust CouchDB's database name checking to its specification (#926).
- `Reset Syncronisation on This Device` for minio and P2P is now working properly. 
-
 Full notes are in
 [updates_old.md](https://github.com/vrtmrz/obsidian-livesync/blob/main/updates_old.md).
@@ -4,6 +4,64 @@ Since 19th July, 2025 (beta1 in 0.25.0-beta1, 13th July, 2025)
 The head note of 0.25 is now in [updates_old.md](https://github.com/vrtmrz/obsidian-livesync/blob/main/updates_old.md). Because 0.25 got a lot of updates, thankfully, compatibility is kept and we do not need breaking changes! In other words, when get enough stabled. The next version will be v1.0.0. Even though it my hope.


+## 0.25.80
+
+7th July, 2026
+
+### Fixed
+
+- Improved Markdown conflict auto-merge so that non-overlapping edits are merged while overlapping delete-and-edit cases remain visible for manual resolution (#993).
+  - Behaviour change:
+    - When one side deletes an unchanged line and the other side edits a different region, the deleted line is no longer reintroduced into the merged result.
+    - When one side deletes a line and the other side modifies that same line, the conflict is preserved instead of silently choosing one side.
+- Fixed an issue where applying a newer database entry to storage could incorrectly preserve an older local file as a conflict (#994).
+  - Behaviour change:
+    - Local storage is preserved as a conflict when it may contain unsynchronised changes that are not represented in the revision history. A newer incoming text entry is applied without creating a conflict only when it clearly extends the existing local text.
+- Fixed an issue where choosing Disable and then Overwrite in Hidden File Sync could silently skip hidden files, because the overwrite setup ran while hidden file synchronisation was still disabled (#989, PR #992).
+  - Hidden File Sync is now re-enabled before the Fetch, Overwrite, or Merge initialisation runs, instead of after it completes. If that initialisation fails, the setting may remain enabled.
+
+## 0.25.79
+
+29th June, 2026
+
+### Fixed
+
+- Fast Fetch now retries transient stream interruptions and resumes from the latest persisted checkpoint, instead of starting over after ordinary network or platform interruptions (#977, PR #978; commonlib PR #59). Thank you so much for @apple-ouyang for the fix!
+- Simple Fetch now remembers the selected setup choices while an interrupted Fetch All operation is still pending, so users are not asked the same questions again on retry (#977, PR #978). Thank you so much for @apple-ouyang for the fix!
+- No longer hidden storage events, such as `.git` paths, reach the normal target-file filter when internal file synchronisation is disabled. This avoids noisy non-target logs before those files are skipped (commonlib PR #60). Thank you so much for @apple-ouyang for the fix!
+- Fixed an issue where a file deleted from storage could be resurrected by the offline scanner because the database tombstone was not written when the storage file was already gone (commonlib PR #56). Thank you so much for @cosmic-fire-eng for the fix!
+
+### Improved
+
+- Local database maintenance commands now ask before applying the required chunk settings, and can apply those prerequisites before continuing (#980, PR #981). Thank you so much for @apple-ouyang for the improvement!
+- Improved CouchDB replication event handling by using the new `StreamInbox` helper from `octagonal-wheels` (commonlib PR #62).
+
+### Documentation
+
+- Added `nginx` to the setup documentation table of contents (PR #976). Thank you so much for @kiraventom for the improvement!
+
+### Miscellaneous
+
+- Updated `octagonal-wheels` to `0.1.47` across the plug-in and workspace packages to use the newly published helper modules.
+
+## 0.25.78
+
+23rd June, 2026
+
+### Fixed
+- No longer fast synchronisation (a.k.a. Fast Fetch) causes a rewind and re-fetch of the entire database when some errors occur during the process (#972, PR #973). Thank you so much for @apple-ouyang for the fix!
+
+### Improved
+
+- Overhauled the Object Storage (e.g., MinIO and S3) replication engine ('Journal Replicator 2nd Edition').
+  - It now leverages the standard Web Streams API for a resilient, backpressure-aware architecture, reducing memory footprints/temporary storage usage on large vaults.
+  - Decoupled the physical storage logic to make it easier to add new storage backends in the future.
+  - Stricter compliance with CouchDB's replication protocol (proper `_revisions` transfers with `new_edits: false`) when using Object Storage.
+
+### Testing
+  - Added comprehensive unit tests for the new `JournalSyncCore` engine, covering streams, backpressure, and `new_edits: false` validation.
+  - Improved integration test workflows in the CI pipeline to run MinIO tests automatically using standard environment variables.
+
 ## 0.25.77

 19th June, 2026
Author	SHA1	Message	Date
vorotamoroz	236f9c434e	Add P2P signalling-only netem benchmark	2026-07-08 10:04:03 +00:00
vorotamoroz	708bd187d8	Add P2P split-container netem stress fixture	2026-07-08 10:03:35 +00:00
vorotamoroz	46081a5f47	Record P2P selected candidate paths	2026-07-08 10:03:11 +00:00
vorotamoroz	e5aa8d5c88	Add CouchDB netem shim benchmark	2026-07-08 10:02:41 +00:00
vorotamoroz	abae4bda28	Add netem smoke fixture for benchmark simulation	2026-07-08 07:38:54 +00:00
vorotamoroz	dc9b4fd37e	Document CLI benchmark comparison model	2026-07-08 07:03:23 +00:00
vorotamoroz	cb1fb0f874	Lower benchmark relay file descriptor limit	2026-07-08 06:54:42 +00:00
vorotamoroz	2cca2355fd	Stabilise CLI P2P smoke readiness	2026-07-08 06:48:17 +00:00
vorotamoroz	5e090a3971	Run CLI network smoke on pull requests	2026-07-08 06:35:26 +00:00
vorotamoroz	fd251346e3	Add Compose-based CLI network benchmarks	2026-07-08 06:30:12 +00:00
vorotamoroz	6a9918677f	Merge pull request #996 from vrtmrz/0_25_80 releasing 0.25.80	2026-07-07 21:21:34 +09:00
vorotamoroz	2d42b92a89	bump	2026-07-07 12:15:58 +00:00
vorotamoroz	a2b794c520	Merge pull request #995 from vrtmrz/fix_conflict_issues Fix conflict issues	2026-07-07 21:13:00 +09:00