diff --git a/A00_Common/design/design_pipeline_page.ts b/A00_Common/design/design_pipeline_page.ts
index 46aebc78f..ffe069533 100644
--- a/A00_Common/design/design_pipeline_page.ts
+++ b/A00_Common/design/design_pipeline_page.ts
@@ -43,6 +43,7 @@ import {
   markAlignmentSaved,
   readAlignmentDraft,
 } from "../../B05_Profile/B05_Profile_UI_Profile_Edit";
+import { readAlignment } from "../../B05_Profile/logic/B05_Profile_UI_Profile_Data";
 import {
   analysisTerrain,
   fetchRoutePlan,
@@ -141,7 +142,7 @@ export function routeDraftBridge(
 export const pipelineGrade = (projectId: string, edits: AlignmentEdits): void =>
   pages.get(projectId)?.grade(edits);
 
-/** 저장 종단 기준이 바뀜(새 상세 · 구조물 측점) — 처음부터 다시. */
+/** 저장 정본이 바뀜(새로 받은 상세 · 새 노선) — 처음부터 다시. 갈아끼운 상세 · 같은 상세 다시 그림은 안 셈. */
 export const restartPagePipeline = (projectId: string): void => pages.get(projectId)?.restart();
 
 /** 유토곡선 설정(토량환산계수 · 자연방토 경사) — masshaul 단계 재료 · 표준단면이 막 왔으면 횡단 입력도. */
@@ -178,19 +179,43 @@ function createPagePipeline(
   let savedStations: PipelineStation[] = [];
   let crossSource: { detail: SectionDetailResponse; source: PipelineCrossSource | null } | null =
     null;
+  /** 저장 정본(서버가 준 상세 · 노선 번호) — 측점 갈아끼움(swap)이 만든 새 상세는 지반 표본 배열을
+   *  그대로 둠 → 정본 아님(묶음 출력 → 상세 → 다시 묶음 고리를 끊음). */
+  let canon: { routeId: unknown; samples: unknown; detail: SectionDetailResponse | null } | null =
+    null;
   let shown: SectionDetailResponse | null = null;
   let ready = false;
   let started = false;
   /** 앞 종단이 노선 초안으로 셈한 것인가 — 초안을 버리면 저장 기준으로 다시 그림. */
   let drawnDraft = false;
   let disposed = false;
+  /** 열 때 · 정본이 바뀐 차례(start) 번호 — 측점 · 종단을 가게에 안 냄(상세 = 저장 정본 그대로). */
+  let openGeneration = -1;
 
   const savedLine = (): Vertex[] | null =>
     plan ? plan.planned.map(([x, y]): Vertex => [x, y]) : null;
   const savedCurves = () =>
     (plan?.curves ?? []).map(({ start, apex, end, radius_m }) => ({ start, apex, end, radius_m }));
+  /** 저장 정본이 바뀌었나(새로 받은 상세 · 새 노선) — 바뀌었으면 잡아 둠. */
+  const canonChanged = (): boolean => {
+    const { detail = null, routeId } = link.pipelineSource();
+    const samples = detail?.longitudinal.samples;
+    if (canon && canon.routeId === routeId && canon.samples === samples) return false;
+    canon = { routeId, samples, detail };
+    return true;
+  };
+  /** 저장 노선 계획고 편집(세션 초안 → 저장분) — 노선 초안을 버리면 이것으로 돌아옴. */
+  const savedEdits = (): AlignmentEdits => {
+    const routeId = canon?.routeId;
+    const longitudinal = canon?.detail?.longitudinal;
+    return (
+      (typeof routeId === "number" ? readAlignmentDraft(routeId) : null) ??
+      (longitudinal && readAlignment(longitudinal)?.edits) ??
+      emptyEdits()
+    );
+  };
   const crossNow = (): PipelineCrossSource | null => {
-    const detail = link.pipelineSource().detail ?? null;
+    const detail = canon?.detail ?? null;
     if (!detail) return null;
     if (crossSource?.detail !== detail || !crossSource.source)
       crossSource = { detail, source: pipelineCrossSource(projectId, detail, savedStations) };
@@ -204,7 +229,14 @@ function createPagePipeline(
         minRadiusM: () => plan?.min_radius_m ?? 0,
         savedLine: () => plan && { line: savedLine()!, curves: savedCurves() },
       }),
-      follow: createFollowStage({ savedLine }),
+      follow: createFollowStage({
+        savedLine,
+        saved: () => ({
+          pipes: store.get("pipes") ?? savedPipes,
+          structures: store.get("structures") ?? savedStructures,
+          alignment: savedEdits(),
+        }),
+      }),
       stations: createStationsStage({ intervalM: options.stationIntervalM, types: () => types }),
       ground: createGroundStage(groundStageDeps(projectId)),
       planline: createPlanlineStage({ savedBase: () => link.pipelineSource().base, savedLine }),
@@ -231,7 +263,11 @@ function createPagePipeline(
       },
     },
   });
-  pipe.subscribe(publishToStore(store));
+  const publish = publishToStore(store);
+  pipe.subscribe((event) => {
+    const saved = event.kind === "stage" && (event.stage === "ground" || event.stage === "profile");
+    if (!(saved && event.generation === openGeneration)) publish(event);
+  });
   pipe.subscribe((event) => {
     if (event.kind !== "stage" || (event.stage !== "profile" && event.stage !== "cross")) return;
     const draft = pipe.input("route") !== null;
@@ -270,8 +306,10 @@ function createPagePipeline(
   };
   const start = (): void => {
     if (disposed || !ready || !link.pipelineSource().base) return;
+    canonChanged();
     started = true;
     void pipe.start(inputsNow());
+    openGeneration = pipe.generation;
   };
 
   /** 저장 노선(그린 선 · 곡선표 · 기본 반경) · 그 측점 열쇠 — [저장] 뒤 다시 받음(`restart`). */
@@ -343,7 +381,7 @@ function createPagePipeline(
     },
     restart() {
       if (!started) return start();
-      void loadPlan().then(start);
+      if (canonChanged()) void loadPlan().then(start); // 갈아끼움 · 같은 상세 다시 그림은 안 셈
     },
     earthwork(context) {
       earthwork = context;
diff --git a/A00_Common/design/design_profile.ts b/A00_Common/design/design_profile.ts
index 05787a867..f49124127 100644
--- a/A00_Common/design/design_profile.ts
+++ b/A00_Common/design/design_profile.ts
@@ -494,13 +494,13 @@ export function createDesignProfile(ctx: DesignProfileContext) {
       const routeChanged = nextRouteId !== routeId;
       const carried = routeChanged && store.edited() ? store.edits() : null;
       // 서버 저장분을 기준으로 삼되, 남아 있는 세션 초안이 있으면 그쪽을 우선한다.
-      if (routeChanged || !store.dirty()) {
+      if (routeChanged || (store !== preview && !store.dirty())) {
         routeId = nextRouteId ?? routeId;
         savedEdits = stored?.edits ?? emptyEdits();
         store = createProfileEditStore(routeId, savedEdits, () => rebuild());
       }
       storedBase = stored ? toAlignmentBase(stored) : null;
-      base = listed();
+      if (store !== preview) base = listed(); // 노선 초안 그림은 그대로(갈아끼운 상세)
       // 이월분은 base 설정 후 미저장 초안으로 커밋한다(확정 시 전송·재탐색 후 새로고침에도 유지).
       if (carried) store.replace(carried);
       alignment = base ? buildAlignment(base, store.edits()) : null;
@@ -580,7 +580,7 @@ export function createDesignProfile(ctx: DesignProfileContext) {
     /** 비정규 측점 목록을 반영해 그래프(세로선+라벨)·테이블(주석)을 다시 그린다. */
     setIrregularStations(stations: IrregularStation[]) {
       irregularStations = stations;
-      base = listed();
+      if (store !== preview) base = listed();
       if (base) alignment = buildAlignment(base, store.edits());
       pagePipeline.restartPagePipeline(projectId);
       draw();
diff --git a/B05_Profile/logic/B05_Profile_Pipeline_Grade.ts b/B05_Profile/logic/B05_Profile_Pipeline_Grade.ts
index cbefd29f0..250a66416 100644
--- a/B05_Profile/logic/B05_Profile_Pipeline_Grade.ts
+++ b/B05_Profile/logic/B05_Profile_Pipeline_Grade.ts
@@ -75,10 +75,15 @@ export function gradeRange(
 /**
  * follow — 노선이 바뀐 차례에 한 번 · 관 · 구조물 좌표 따라감 · 계획고 편집 옮김. 첫 계산(옛 노선 없음)은
  * 저장 노선(`savedLine`)을 옛 노선으로 보고 좌표만 따라감(투영은 몇 번 해도 같음 · 계획고 옮김은 안 함 —
- * 열 때의 계획고 초안은 이미 그 노선 기준).
+ * 열 때의 계획고 초안은 이미 그 노선 기준). 노선 초안이 없으면(열 때 · 초안 버림) `saved` 를 그대로 —
+ * 저장 노선의 관 · 구조물 누가거리 · 계획고는 정본이라 다시 투영하지 않음(투영 오차 = 측점 목록 어긋남).
  */
-export function createFollowStage(deps: { savedLine(): Vertex[] | null }): StageFn<"follow"> {
+export function createFollowStage(deps: {
+  savedLine(): Vertex[] | null;
+  saved?(): FollowPatch;
+}): StageFn<"follow"> {
   return (ctx) => {
+    if (!ctx.inputs.route && deps.saved) return deps.saved();
     const before = ctx.before.route?.line ?? deps.savedLine();
     const now = ctx.out.route;
     if (!before || !now) return {};
diff --git a/resources/tester/helper_349_pipeline_once.cjs b/resources/tester/helper_349_pipeline_once.cjs
new file mode 100644
index 000000000..88d747be7
--- /dev/null
+++ b/resources/tester/helper_349_pipeline_once.cjs
@@ -0,0 +1,255 @@
+/* PLAN 349 sub7 헬퍼 — 페이지 계산 묶음이 조작 하나에 한 번만 도는지 · 열기만 하면 저장 측점 목록 그대로인지.
+ * 진짜 TS(`design_pipeline_page` · 단계 파일 전부)를 트랜스파일해 Node 로 돌림 · 서버 창구만 가짜.
+ * 종단 보기 고리(가게 stations → 상세 갈아끼움 → 종단도 render · 비정규 측점 · 유토곡선 설정)를 흉내 냄 —
+ * `design_view_profile_sections.followSwap` · `design_profile.render` 가 부르는 그대로.
+ * 입력 argv[2] JSON · argv[3] 격자 이진. 결과 = 표준출력 JSON. 짝 = `test_349_pipeline_once.py`. */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+const CATALOG = require("./helper_322_catalog_module.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+const job = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
+
+function memoryStorage() {
+  const map = new Map();
+  return {
+    getItem: (key) => (map.has(key) ? map.get(key) : null),
+    setItem: (key, value) => map.set(key, String(value)),
+    removeItem: (key) => map.delete(key),
+    key: (index) => [...map.keys()][index] ?? null,
+    get length() {
+      return map.size;
+    },
+  };
+}
+globalThis.window = {
+  sessionStorage: memoryStorage(),
+  localStorage: memoryStorage(),
+  setTimeout,
+  clearTimeout,
+};
+
+// 흙 배분 서버 — 늦게 답함 · 끊기면 버림
+globalThis.fetch = (url, init) =>
+  new Promise((resolve, reject) => {
+    const timer = setTimeout(
+      () => resolve({ ok: true, json: async () => ({ haul_plan: { blocks: [], url } }) }),
+      20,
+    );
+    init.signal.addEventListener("abort", () => {
+      clearTimeout(timer);
+      reject(new Error("aborted"));
+    });
+  });
+
+const STUBS = {};
+const cache = new Map();
+function loadTs(full) {
+  if (cache.has(full)) return cache.get(full);
+  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2020 },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(full, box.exports);
+  const localRequire = (request) => {
+    if (CATALOG.isCatalogRequest(request)) return CATALOG;
+    const key = Object.keys(STUBS).find((name) => request.endsWith(name));
+    if (key) return STUBS[key];
+    if (request.startsWith("@config/")) return { API_BASE_URL: "http://fake" };
+    if (request.startsWith("@util/"))
+      return loadTs(path.join(ROOT, "common_util", `${request.slice(6)}.ts`));
+    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
+    return require(request);
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  return box.exports;
+}
+const load = (...parts) => loadTs(path.join(ROOT, ...parts));
+
+const sampler = load("common_util", "common_util_surface_sampler.ts");
+const bytes = fs.readFileSync(process.argv[3]);
+const grid = sampler.parseDtmGrid(
+  bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.length),
+);
+const local = { grid, design: "las" };
+
+STUBS["B05_Profile_Api_Replan"] = {
+  analysisTerrain: () => "las",
+  fetchRoutePlan: async () => ({
+    planned: job.line,
+    curves: job.curves,
+    min_radius_m: job.minRadius,
+    station_snap: job.stationSnap,
+  }),
+};
+STUBS["B05_Profile_Api_Structures"] = {
+  fetchStructures: async () => ({ structures: [] }),
+  fetchStructureTypes: async () => job.types,
+};
+STUBS["B05_Profile_Api_TerrainGrid"] = {
+  loadDesignTerrainGrid: async () => local,
+  groundStageDeps: () => ({ grid: () => local, remote: async () => [] }),
+};
+STUBS["B04_PreProcess_Api_Fetch"] = {
+  fetchDetailPipePoints: async () => ({
+    pipe_points: job.pipes.map((pipe) => ({ ...pipe, lonlat: [0, 0] })),
+  }),
+};
+STUBS["B06_Section_UI_Standard_Panel"] = { effectiveStandardCross: () => job.standard };
+
+const pageMod = load("A00_Common", "design", "design_pipeline_page.ts");
+const storeMod = load("A00_Common", "design", "design_store.ts");
+const alignment = load("B05_Profile", "logic", "B05_Profile_UI_Profile_Alignment.ts");
+const page = load("A00_Common", "b_page_state.ts");
+
+const tick = (ms = 0) => new Promise((resolve) => setTimeout(resolve, ms));
+const runs = () => globalThis.__aisloPipeline?.runs ?? [];
+/** 묶음이 조용해질 때까지 — 마지막 기록이 끝나고 새 기록이 더 안 생김(고리면 계속 생김). */
+async function quiet() {
+  let seen = -1;
+  for (let i = 0; i < 400; i += 1) {
+    await tick(15);
+    const last = runs()[runs().length - 1];
+    const count = runs().length;
+    if (count === seen && (!last || last.outcome !== "running")) return;
+    seen = count;
+  }
+  throw new Error("묶음이 조용해지지 않음");
+}
+const n = job.nodes.length;
+const draftOf = (nodes) => ({
+  nodes,
+  curveOn: Array(n).fill(true),
+  curveRadius: Array(n).fill(null),
+  curveLock: Array(n).fill(null),
+  curveArc: Array(n).fill(null),
+  stationSnap: job.stationSnap,
+});
+const shift = (index, dx, dy) =>
+  job.nodes.map((node, i) => (i === index ? [node[0] + dx, node[1] + dy] : node));
+const chainagesOf = (stations) => (stations ?? []).map((s) => s.chainageM);
+
+async function openOnce(P) {
+  window.localStorage.setItem("frd_current_project_id", P);
+  const savedAlignment = job.detail.longitudinal.profile_alignment;
+  const savedBase = alignment.toAlignmentBase(savedAlignment);
+  let detail = job.detail;
+  const swaps = [];
+  const grades = [];
+  const link = {
+    pipelineSource: () => ({ base: savedBase, edits: savedAlignment.edits, detail, routeId: 7 }),
+    // 종단도 adoptPipeline → rebuild → pipelineGrade(지금 가게 편집)
+    adoptPipeline: (base, edits, draft) => {
+      const now = draft ? edits : savedAlignment.edits;
+      grades.push(draft);
+      pageMod.pipelineGrade(P, now);
+    },
+    redraw: () => undefined,
+    side: null,
+  };
+  const before = runs().length;
+  pageMod.routeDraftBridge(P, link, { stationIntervalM: job.interval });
+  // 종단 보기 · 횡단 보기 고리 — 측점 목록이 다르면 상세를 갈아끼우고(지반 표본 배열은 그대로) render
+  const stop = storeMod.useDesignStore(P, null).subscribe("stations", (stations) => {
+    if (!stations?.length) return;
+    const now = detail.cross_sections.map((s) => s.chainage_m);
+    const same =
+      now.length === stations.length &&
+      stations.every((s, i) => Math.abs(s.chainageM - now[i]) < 1e-6);
+    if (same) return;
+    swaps.push(stations.length);
+    void Promise.resolve().then(() => {
+      detail = {
+        ...detail,
+        longitudinal: {
+          ...detail.longitudinal,
+          stations: stations.map((s) => ({ chainage_m: s.chainageM, kind: s.kind })),
+        },
+        cross_sections: stations.map((s) => ({
+          ...(detail.cross_sections.find((c) => Math.abs(c.chainage_m - s.chainageM) < 0.01) ?? {}),
+          chainage_m: s.chainageM,
+        })),
+      };
+      pageMod.restartPagePipeline(P); // profilePanel.render
+      pageMod.restartPagePipeline(P); // setIrregularStations
+      pageMod.pipelineEarthwork(P, { conversion: job.conversion }); // B06 render
+    });
+  });
+  pageMod.pipelineEarthwork(P, { conversion: job.conversion });
+  pageMod.restartPagePipeline(P); // 첫 render(묶음 준비 전)
+  await quiet();
+  const pipe = pageMod.pagePipeline(P);
+  return { link, pipe, before, swaps, grades, stop, savedAlignment };
+}
+
+async function run() {
+  const P = "proj-349";
+  const ctx = await openOnce(P);
+  const { pipe, swaps } = ctx;
+  const openRuns = runs().slice(ctx.before);
+  const stations = pipe.output("ground")?.stations ?? [];
+  const open = {
+    runs: openRuns.map((r) => ({ sources: r.sources, outcome: r.outcome })),
+    swaps: swaps.length,
+    stations: chainagesOf(stations),
+    saved: job.detail.cross_sections.map((s) => s.chainage_m),
+    pipeChainages: (pipe.input("pipes") ?? []).map((p) => p.chainage_m),
+    final: pipe.output("masshaul")?.haulInput?.final_cumulative_m3 ?? null,
+    footprint: pipe.output("footprint")?.records.length ?? 0,
+  };
+
+  // 노선 꼭짓점 한 번 끌어 놓기
+  let mark = runs().length;
+  const dragMark = swaps.length;
+  const bridge = pageMod.routeDraftBridge(P, ctx.link);
+  bridge.edited(draftOf(shift(1, 6, -4)));
+  await quiet();
+  const drag = {
+    runs: runs()
+      .slice(mark)
+      .map((r) => ({ sources: r.sources, outcome: r.outcome })),
+    swaps: swaps.length - dragMark,
+  };
+
+  // 되돌리기 한 번(열 때로)
+  mark = runs().length;
+  const swapMark = swaps.length;
+  bridge.edited(null);
+  await quiet();
+  const undo = {
+    runs: runs()
+      .slice(mark)
+      .map((r) => ({ sources: r.sources, outcome: r.outcome })),
+    pipeChainages: (pipe.input("pipes") ?? []).map((p) => p.chainage_m),
+    alignmentSaved:
+      JSON.stringify(pipe.input("alignment")) === JSON.stringify(ctx.savedAlignment.edits),
+    stations: chainagesOf(pipe.output("ground")?.stations),
+    swapsAfter: swaps.length - swapMark,
+  };
+  const blocked = pipe.blockedWrites;
+  ctx.stop();
+  pageMod.disposePagePipeline(P);
+  page.clearDrafts(P);
+
+  // 다시 열기 — 같은 입력이면 같은 값
+  const again = await openOnce("proj-349b");
+  const reopen = {
+    runs: runs().slice(again.before).length,
+    final: again.pipe.output("masshaul")?.haulInput?.final_cumulative_m3 ?? null,
+    stations: chainagesOf(again.pipe.output("ground")?.stations),
+  };
+  again.stop();
+  pageMod.disposePagePipeline("proj-349b");
+  return { open, drag, undo, reopen, blocked };
+}
+
+run()
+  .then((out) => {
+    process.stdout.write(JSON.stringify(out));
+    process.exit(0);
+  })
+  .catch((error) => {
+    process.stderr.write(String(error && error.stack ? error.stack : error));
+    process.exit(1);
+  });
diff --git a/resources/tester/test_349_pipeline_once.py b/resources/tester/test_349_pipeline_once.py
new file mode 100644
index 000000000..f46ce494a
--- /dev/null
+++ b/resources/tester/test_349_pipeline_once.py
@@ -0,0 +1,133 @@
+"""PLAN 349 sub7 — 조작 하나 = 묶음 한 번 · 열기만 하면 저장 정본 그대로.
+
+· 열 때 묶음 한 번 · 측점 목록 = 저장 측점(갈아끼움 없음 · 관 누가거리 = 저장값)
+· 노선 꼭짓점 한 번 끌기 = 한 번(sources [route]) — 갈아끼운 상세 다시 그림이 처음부터 다시 안 부름
+· 되돌리기 한 번(열 때로) = 한 번 · 관 · 계획고 = 저장값 · 측점 = 저장 측점
+· 다시 열면 같은 값 · 계산 · 알림 안 입력 쓰기 0
+짝: `helper_349_pipeline_once.cjs`(실제 TS 를 Node 로 · 서버 창구만 가짜 · 종단 보기 고리 흉내).
+"""
+
+from __future__ import annotations
+
+import csv
+import json
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parents[1]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+from B05_Profile.B05_Profile_Structures_Schema import structure_type_map  # noqa: E402
+from common_util.common_util_surface_sampler import dtm_grid_bytes  # noqa: E402
+from config.config_system_design import STANDARD_CROSS_SECTION  # noqa: E402
+
+pytestmark = pytest.mark.skipif(
+    not (ROOT / "config" / "node_modules" / "typescript").is_dir(),
+    reason="프론트엔드 의존성 미설치",
+)
+
+PROJECT = ROOT / "storage/1/3/6d3b2812-6d5a-4168-a932-40e4ae303d5a"  # 검증_sub7
+ROUTE = PROJECT / "B05_Profile/route"
+SECTION = PROJECT / "B06_Section"
+GRID = PROJECT / "B04_PreProcess/models/dtm_classification_smooth.npz"
+ONES = {g: {"loose": 1.0, "compacted": 1.0} for g in ("soil", "ripping_rock", "blasting_rock")}
+
+
+def _csv(path: Path) -> list[list[float]]:
+    with path.open(encoding="utf-8") as handle:
+        return [[float(r["x"]), float(r["y"])] for r in csv.DictReader(handle)]
+
+
+def _json(path: Path):
+    return json.loads(path.read_text(encoding="utf-8"))
+
+
+@pytest.fixture(scope="module")
+def r() -> dict:
+    if not (GRID.is_file() and (SECTION / "longitudinal/longitudinal.json").is_file()):
+        pytest.skip("검증_sub7 없음")
+    curves = _json(ROUTE / "planned_route_curves.json")
+    sections = sorted(
+        (_json(p) for p in (SECTION / "cross_sections").glob("cross_*.json")),
+        key=lambda s: s["chainage_m"],
+    )
+    pipes = _json(PROJECT / "B04_PreProcess/drainage/edits/pipe_points.json")["points"]
+    job = {
+        "line": _csv(ROUTE / "planned_route.csv"),
+        "nodes": _csv(ROUTE / "planned_route_nodes.csv"),
+        "curves": [
+            {k: c[k] for k in ("start", "apex", "end", "radius_m")} for c in curves["curves"]
+        ],
+        "stationSnap": bool(curves.get("station_snap")),
+        "minRadius": curves["min_radius_m"],
+        "interval": 20.0,
+        "types": [
+            {"type_id": t.type_id, "group": t.group, "placement": t.placement}
+            for t in structure_type_map().values()
+        ],
+        "pipes": pipes,
+        "standard": STANDARD_CROSS_SECTION,
+        "conversion": ONES,
+        "detail": {
+            "longitudinal": _json(SECTION / "longitudinal/longitudinal.json"),
+            "cross_sections": sections,
+        },
+    }
+    with tempfile.TemporaryDirectory() as folder:
+        path = Path(folder) / "job.json"
+        path.write_text(json.dumps(job), encoding="utf-8")
+        grid = Path(folder) / "grid.bin"
+        grid.write_bytes(dtm_grid_bytes(GRID))
+        proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
+            ["node", str(HERE / "helper_349_pipeline_once.cjs"), str(path), str(grid)],
+            capture_output=True,
+            text=True,
+            encoding="utf-8",
+            timeout=300,
+        )
+    assert proc.returncode == 0, proc.stderr
+    out = json.loads(proc.stdout)
+    out["savedPipes"] = [p["chainage_m"] for p in pipes]
+    return out
+
+
+def _same(a: list[float], b: list[float]) -> bool:
+    return len(a) == len(b) and all(abs(x - y) < 1e-6 for x, y in zip(a, b))
+
+
+def test_열_때_한_번_저장_측점_그대로(r):
+    o = r["open"]
+    assert [x["outcome"] for x in o["runs"]] == ["done"], o["runs"]
+    assert o["swaps"] == 0  # 열 때 측점을 가게에 안 냄 — 상세 = 저장 정본 그대로
+    # 묶음 측점 ≈ 저장 측점 — 끝점만 저장 노선 csv 자릿수(0.1 mm)만큼 다를 수 있음(그래서 안 냄)
+    assert len(o["stations"]) == len(o["saved"])
+    assert all(abs(x - y) < 0.001 for x, y in zip(o["stations"], o["saved"]))
+    assert o["pipeChainages"] == r["savedPipes"]
+    assert o["footprint"] > 0
+
+
+def test_꼭짓점_끌기_한_번(r):
+    d = r["drag"]
+    assert [x["sources"] for x in d["runs"]] == [["route"]], d["runs"]
+    assert d["swaps"] == 1  # 새 노선 측점으로 갈아끼움은 한 번(고리 아님)
+
+
+def test_되돌리기_한_번_저장값으로(r):
+    u = r["undo"]
+    assert [x["sources"] for x in u["runs"]] == [["route"]], u["runs"]
+    assert u["pipeChainages"] == r["savedPipes"]
+    assert u["alignmentSaved"]
+    assert _same(u["stations"], r["open"]["stations"])
+
+
+def test_다시_열면_같은_값_고리_없음(r):
+    assert r["reopen"]["runs"] == 1
+    assert r["reopen"]["final"] == r["open"]["final"]
+    assert r["reopen"]["stations"] == r["open"]["stations"]
+    assert r["blocked"] == 0