diff --git a/resources/tester/test_346_3_route_save.py b/resources/tester/test_346_3_route_save.py
index 50aa79fef..3a0618cb5 100644
--- a/resources/tester/test_346_3_route_save.py
+++ b/resources/tester/test_346_3_route_save.py
@@ -1,108 +1,561 @@
-"""346-3 화면 — [노선 반영] 없앰 · [저장]이 노선부터 · 추천 [적용] = as_initial 저장 · 저장 뒤 초안 넘김.
+# -*- coding: utf-8 -*-
+"""346-3 노선 저장 서버 길 — 차례 · 관 지킴 · 새 교차점 기본 관 · 오목 보충 · 이월 열쇠 ·
+초기값 규칙 ·
+배수유역 낡음 · 실패 때 옛 노선 되살림.
 
-노선 이음(`B05_Profile_UI_RouteEdit_Apply`)은 Node 헬퍼 `helper_346_3_route_save.cjs` 가 서버 · 화면 창구만
-가짜로 두고 돌림 · 저장 차례(노선 먼저 · 안 바뀌면 안 보냄 · 실패 때 초안 남음)는 `test_design_store_save.py`.
+순수 부품(`B05_Profile_Route_Save_Parts`)은 값으로 · 체인(`run_route_save_chain`)과 API
+(`replan_route`)는 DB · 엔진을 가짜로 바꿔 차례 · 되살림 · 초기값만 잰다.
 """
 
 from __future__ import annotations
 
+import asyncio
 import json
-import subprocess
+import sys
 from pathlib import Path
+from types import SimpleNamespace
+from uuid import uuid4
 
+import numpy as np
 import pytest
 
-HERE = Path(__file__).resolve().parent
-ROOT = HERE.parents[1]
+ROOT = Path(__file__).resolve().parents[2]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+from fastapi.responses import JSONResponse  # noqa: E402
+
+import B03_FileInput.B03_FileInput_Service_Chain as chain  # noqa: E402
+import B04_PreProcess.B04_PreProcess_Router_Watershed as watershed  # noqa: E402
+import B05_Profile.B05_Profile_Route_Save as save  # noqa: E402
+import B05_Profile.B05_Profile_Router as b05_router  # noqa: E402
+import B05_Profile.B05_Profile_Router_Replan as replan  # noqa: E402
+import B05_Profile.B05_Profile_Router_RouteInitial as route_initial  # noqa: E402
+import B05_Profile.B05_Profile_Structures_Router as structures_router  # noqa: E402
+import B06_Section.B06_Section_Repository as b06_repo  # noqa: E402
+import B06_Section.B06_Section_Router as b06_router  # noqa: E402
+import B06_Section.B06_Section_Router_Confirm as b06_confirm  # noqa: E402
+import common_util.common_util_drainage_pipes as drainage_pipes  # noqa: E402
+import common_util.common_util_initial_snapshot as snapshot  # noqa: E402
+import common_util.common_util_workflow_state as workflow  # noqa: E402
+from B05_Profile.B05_Profile_Route_Save_Parts import (  # noqa: E402
+    add_crossing_pipes,
+    carry_cross_inputs,
+    concave_chainages,
+    fill_concave_pipes,
+    follow_pipes,
+    station_keys,
+    vertices_of,
+)
+from common_util.common_util_drainage_pipes import (  # noqa: E402
+    PIPE_SOURCE_SPACING,
+    PIPE_SOURCE_STREAM,
+    PipePoint,
+    analysis_route_signature,
+    route_signature,
+)
+
+OLD = [(0.0, 0.0), (100.0, 0.0), (200.0, 0.0), (300.0, 0.0), (400.0, 0.0)]
+# 새 노선 = 100 ~ 300 m 를 북으로 휘게(앞 · 뒤는 옛 노선 위)
+NEW = [(0.0, 0.0), (100.0, 0.0), (200.0, 60.0), (300.0, 0.0), (400.0, 0.0)]
 
 
-def _read(rel: str) -> str:
-    return (ROOT / rel).read_text(encoding="utf-8")
+# ── 관 따라감 · 교차점 · 오목 보충 ─────────────────────────────────────────────
 
 
-@pytest.fixture(scope="module")
-def out() -> dict:
-    run = subprocess.run(
-        ["node", str(HERE / "helper_346_3_route_save.cjs")],
-        capture_output=True,
-        text=True,
-        encoding="utf-8",
-        check=True,
+def test_관은_지우지_않고_좌표를_따라감():
+    old = [
+        PipePoint(chainage_m=50.0, x=50.0, y=0.0, options={"pipe_kind": "흄관"}),
+        PipePoint(chainage_m=350.0, x=350.0, y=0.0, start_m=345.0, end_m=355.0),
+    ]
+    pairs = follow_pipes(old, vertices_of(NEW))
+    assert [pipe_id for pipe_id, _ in pairs] == [0, 1]
+    assert pairs[0][1].options == {"pipe_kind": "흄관"}  # 사용자 관 속성 그대로
+    shift = pairs[1][1].chainage_m - 350.0  # 새 노선이 길어진 만큼 뒤 관이 밀림
+    assert shift > 30 and pairs[1][1].start_m == pytest.approx(345.0 + shift)
+    assert old[1].chainage_m == 350.0  # 옛 목록은 안 고침
+
+
+def test_새_교차점에만_기본_관():
+    pairs = follow_pipes([PipePoint(chainage_m=50.0, x=50.0, y=0.0)], vertices_of(NEW))
+    crossings = [
+        SimpleNamespace(chainage_m=20.0, x=20.0, y=0.0),  # 옛 노선 위 — 사용자가 지운 관 안 되살림
+        SimpleNamespace(chainage_m=150.4, x=150.0, y=30.0),  # 새 자리 · 관 없음 → 더함
+        SimpleNamespace(chainage_m=52.0, x=52.0, y=0.0),  # 옛 자리
+    ]
+    added = add_crossing_pipes(pairs, crossings, OLD, 456.0)
+    assert added == 1
+    new = [pipe for pipe_id, pipe in pairs if pipe_id < 0]
+    assert new[0].chainage_m == 150.0 and new[0].source == PIPE_SOURCE_STREAM
+    # 같은 자리 다시 = 이미 관이 있음
+    assert add_crossing_pipes(pairs, crossings, OLD, 456.0) == 0
+
+
+def test_오목_지점_보충은_새_자리의_오목만():
+    vertices = vertices_of(NEW)
+    total = vertices[-1].chainage_m
+    chainage = np.arange(0.0, total, 2.0)
+    ground = 100.0 + np.abs(chainage - 220.0) * 0.05  # 220 m 에 골(새 자리)
+    ground[chainage < 60] = (
+        100.0 + np.abs(chainage[chainage < 60] - 30.0) * 0.05
+    )  # 30 m 골(옛 자리)
+    concave = concave_chainages(chainage, ground)
+    assert any(abs(at - 220.0) < 3 for at, _ in concave)
+    pairs: list = []
+    added = fill_concave_pipes(pairs, concave, vertices, OLD)
+    places = [pipe.chainage_m for _, pipe in pairs]
+    assert added >= 1 and all(pipe.source == PIPE_SOURCE_SPACING for _, pipe in pairs)
+    assert any(abs(at - 220.0) <= 3 for at in places)
+    assert not any(at < 60 for at in places)  # 옛 노선 위 오목엔 안 둠
+
+
+def test_간격이_좁으면_보충_없음():
+    vertices = vertices_of(NEW)
+    pairs = [(0, PipePoint(chainage_m=at)) for at in (0.0, 90.0, 180.0, 270.0, 360.0, 450.0)]
+    concave = [(220.0, 99.0)]
+    assert fill_concave_pipes(pairs, concave, vertices, OLD) == 0
+
+
+# ── 측점 열쇠 · 횡단 이월 ──────────────────────────────────────────────────────
+
+
+def _structure(sid, type_id, anchor, start=None, end=None):
+    return SimpleNamespace(
+        structure_id=sid,
+        type_id=type_id,
+        chainage_m=anchor,
+        start_m=start,
+        end_m=end,
+        options={},
     )
-    return json.loads(run.stdout)
 
 
-def test_노선_안_바뀜_안_보냄(out):
-    assert out["noneAtAll"] is None
-    assert out["unchanged"] is None  # 편집기가 정함 — 가게에 초안이 남아 있어도
-    assert out["storeOnly"]["draft"]["rev"] == 3  # 편집기 없으면 가게 routeDraft
-
-
-def test_초안은_계약_RouteDraft_꼴(out):
-    draft = out["body"]["draft"]
-    assert set(draft) == {
-        "rev",
-        "nodes",
-        "curveOn",
-        "curveRadius",
-        "curveLock",
-        "curveArc",
-        "stationSnap",
-        "terrain",
+def test_측점_열쇠_규칙():
+    stations = [{"chainage_m": s} for s in (0.0, 20.0, 40.0, 50.0, 60.0, 77.0, 80.0, 95.5)]
+    pipes = [(3, PipePoint(chainage_m=50.0))]
+    structures = [_structure("w1", "retaining_wall", 77.0, 60.0, 80.0)]
+    keys = station_keys(stations, pipes, structures, 20.0)
+    assert keys == {
+        "end:BP": 0.0,
+        "grid:1": 20.0,
+        "grid:2": 40.0,
+        "pipe:3": 50.0,
+        "structure:w1:start": 60.0,
+        "structure:w1": 77.0,
+        "structure:w1:end": 80.0,
+        "end:EP": 95.5,
     }
-    n = len(draft["nodes"])
-    assert all(
-        len(draft[name]) == n for name in ("curveOn", "curveRadius", "curveLock", "curveArc")
+
+
+def test_이월은_열쇠로_누가거리가_밀려도():
+    old_keys = {
+        "end:BP": 0.0,
+        "grid:1": 20.0,
+        "pipe:0": 50.0,
+        "structure:w1": 77.0,
+        "grid:5": 100.0,
+    }
+    new_keys = {"end:BP": 0.0, "grid:1": 20.0, "pipe:0": 57.0, "structure:w1": 84.0}
+    designs = {
+        0.0: {"ground_type": "soil"},
+        20.0: {"ground_type": "rock", "berm": {"on": True}, "cut_area_m2": 9.0},
+        50.0: {"ditch_type": "u", "inlet_structure": "basin", "basin_adjust": {"d": 1}},
+        77.0: {"rock_boundary_offset_m": 0.8, "revet_adjust": {"h": 2}},
+        100.0: {"ground_type": "soil"},
+    }
+    inputs, adjusts, dropped = carry_cross_inputs(
+        old_keys,
+        new_keys,
+        designs,
+        ("ground_type", "ditch_type", "berm", "rock_boundary_offset_m"),
+        ("inlet_structure", "basin_adjust", "revet_adjust"),
     )
-    assert draft["curveOn"] == [True, False, True] and draft["curveRadius"] == [None, 25, None]
-    assert draft["stationSnap"] is True and draft["terrain"] == "sheet"
-    assert out["body"]["initial"] == {"mode": "follow"} and out["body"]["balanced_profile"] is True
-    assert "as_initial" not in out["body"]  # 손으로 고친 노선 = 초기값 그대로
+    assert inputs == {
+        0.0: {"ground_type": "soil"},
+        20.0: {"ground_type": "rock", "berm": {"on": True}},  # 결과 칸(면적)은 안 넘김
+        57.0: {"ditch_type": "u"},
+        84.0: {"rock_boundary_offset_m": 0.8},
+    }
+    # 구조물 조정은 관 · 구조물 열쇠만 따라감
+    assert adjusts == {
+        57.0: {"inlet_structure": "basin", "basin_adjust": {"d": 1}},
+        84.0: {"revet_adjust": {"h": 2}},
+    }
+    assert dropped == 1  # grid:5 — 새 노선에 없음(노선 밖 고침)
 
 
-def test_저장_뒤_가게_초안_비움_결과_한_줄(out):
-    assert out["savedRouteId"] == 9
-    assert out["storeAfterSave"] is None
-    assert out["keptAfterSave"] == 1
-    assert out["summary"] == (
-        "노선 저장 — 관 지킴 3 · 새 교차 관 1 · 오목 보충 관 2 · 구조물 옮김 1 · 멀어짐 0 · "
-        "노선 밖 고침 3 건 · 배수유역 낡음"
-    )  # 서버 cross_dropped 1 + 화면 넘김 밖 2 = 한 줄
+# ── 노선 초안 요청 ────────────────────────────────────────────────────────────
 
 
-def test_초안_넘김_차례(out):
-    assert out["carryCalls"] == ["invalidate:9", "load:9", "keys:9:9", "carry:7->9", "crossSave:9"]
-    assert out["outside"] == 2
+def test_초안_모양을_옛_칸으로():
+    body = save.RouteSaveRequest(
+        draft={
+            "rev": 3,
+            "nodes": [[0, 0], [10, 5], [20, 0]],
+            "curveOn": [True, False, True],
+            "curveRadius": [None, 30.0, None],
+            "curveLock": [None, "radius", None],
+            "curveArc": [None, None, None],
+            "stationSnap": True,
+            "terrain": "sheet",
+        }
+    )
+    request = body.resolved()
+    assert [(v.x, v.y, v.curve, v.radius_m) for v in request.vertices] == [
+        (0, 0, True, None),
+        (10, 5, False, 30.0),
+        (20, 0, True, None),
+    ]
+    assert request.station_snap is True and request.terrain == "sheet"
+    with pytest.raises(ValueError):
+        save.RouteSaveRequest(draft={"nodes": [[0, 0], [1, 1]], "curveOn": [True]}).resolved()
 
 
-def test_추천_적용은_as_initial_저장_뒤_다시_세움(out):
-    assert out["recommendOk"] is True
-    body = out["recommendBody"]
-    assert body["as_initial"] is True and body["initial"] == {"mode": "earthwork"}
-    assert body["draft"]["nodes"] == [[1, 1], [9, 9]]
-    assert out["recommendCalls"] == ["overlay:on", "replan", "overlay:off"]  # 잠금 막 하나
-    assert out["recommendDraftsLeft"] == {"route": None, "pipes": None}  # 새 초기값에서 다시
-    assert out["rebuilt"] == 1
+# ── 체인 차례 · 되살림 · 배수유역 낡음 ─────────────────────────────────────────
 
 
-def test_추천_저장_실패는_한_줄_다시_안_세움(out):
-    assert out["recommendFail"] is False
-    errors = [c for c in out["recommendFailCalls"] if c.startswith("toast:error:")]
-    assert len(errors) == 1 and "체인 실패" in errors[0]
-    assert out["rebuiltAfterFail"] == 1
+class _Cursor:
+    def __init__(self, log):
+        self.log = log
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, *exc):
+        return False
+
+    async def execute(self, sql, params=None):
+        self.log.append(" ".join(sql.split()))
 
 
-def test_노선_반영_단추_없앰_배선():
-    chrome = _read("B05_Profile/B05_Profile_UI_RouteEdit_Chrome.ts")
-    assert 'data-act="apply"' not in chrome and "노선 반영</button>" not in chrome
-    apply = _read("B05_Profile/B05_Profile_UI_RouteEdit_Apply.ts")
-    assert "addEventListener" not in apply  # 단추 듣기 없음 — [저장]이 부름
-    save = _read("A00_Common/design/design_save.ts")
-    assert save.index('"route",') < save.index('"pipes",')
-    assert "await pendingRouteSave(ctx.projectId)" in save
-    assert "carryAfterRouteSave(ctx.projectId, fromRouteId, routeId)" in save
-    initial = _read("B05_Profile/B05_Profile_UI_RouteEdit_Initial.ts")
-    at = initial.index("onApply: (picked) => {")
-    assert "saveRecommendedRoute(" in initial[at : at + 900]
-    replan = _read("B05_Profile/B05_Profile_Api_Replan.ts")
-    assert "body: JSON.stringify(body)" in replan and "as_initial?: boolean;" in replan
+class _Connection:
+    def __init__(self, log):
+        self.log = log
+
+    def cursor(self, *args):
+        return _Cursor(self.log)
+
+    async def begin(self):
+        return None
+
+    async def commit(self):
+        return None
+
+    async def rollback(self):
+        return None
+
+
+class _Pool:
+    def __init__(self, log):
+        self.log = log
+
+    def acquire(self):
+        connection = _Connection(self.log)
+
+        class _Acquire:
+            async def __aenter__(self):
+                return connection
+
+            async def __aexit__(self, *exc):
+                return False
+
+        return _Acquire()
+
+
+def _async(value, order=None, name=None):
+    async def fake(*args, **kwargs):
+        if order is not None:
+            order.append(name)
+        return value
+
+    return fake
+
+
+@pytest.fixture
+def chain_world(monkeypatch, tmp_path):
+    order: list[str] = []
+    sql: list[str] = []
+    root = tmp_path
+    route_file = root / "B05_Profile" / "route" / "route_main.geojson"
+    route_file.parent.mkdir(parents=True)
+    route_file.write_text(
+        json.dumps({"geometry": {"coordinates": [[*p, 0] for p in OLD]}}), "utf-8"
+    )
+    long_dir = root / "B06_Section" / "longitudinal"
+    long_dir.mkdir(parents=True)
+    (long_dir / "longitudinal.json").write_text(json.dumps({"stations": [], "old": True}), "utf-8")
+    drain = root / "drain"
+    pipes_file = drain / "edits" / "pipe_points.json"
+    pipes_file.parent.mkdir(parents=True)
+    pipes_file.write_text(
+        json.dumps(
+            {"route_signature": "old", "points": [{"chainage_m": 50.0, "x": 50.0, "y": 0.0}]}
+        ),
+        "utf-8",
+    )
+    (drain / "00_watershed_response.json").write_text(
+        json.dumps({"route_signature": "old"}), "utf-8"
+    )
+    state = {"stages": [{"stage_no": 2, "params": {"points": {}, "options": {}}}]}
+
+    def solve(project_id, request, *, generate_sections=True):
+        order.append("solve")
+        assert generate_sections is False
+        route_file.write_text(
+            json.dumps({"geometry": {"coordinates": [[*p, 0] for p in NEW]}}), "utf-8"
+        )
+        return _async(
+            SimpleNamespace(
+                route_id=8,
+                total_length_m=456.0,
+                route_data_path="B05_Profile/route/route_main.geojson",
+            )
+        )()
+
+    async def regenerate(*args, **kwargs):
+        order.append("sections")
+        (long_dir / "longitudinal.json").write_text(
+            json.dumps({"stations": [], "new": True}), "utf-8"
+        )
+        return SimpleNamespace()
+
+    async def watershed_must_not_run(*args, **kwargs):
+        raise AssertionError("배수유역은 체인에서 뗌")
+
+    async def prepare(project_id):
+        order.append("pipes")
+        return {"vertices": vertices_of(NEW), "streams": []}
+
+    monkeypatch.setattr(save, "get_db_pool", lambda: _Pool(sql))
+    monkeypatch.setattr(workflow, "get_workflow_state", _async(state))
+    monkeypatch.setattr(workflow, "start_stage", _async(None, order, "restore_params"))
+    monkeypatch.setattr(
+        b06_repo,
+        "get_longitudinal_section",
+        _async(
+            {"data": {}, "longitudinal_file_path": "B06_Section/longitudinal/longitudinal.json"}
+        ),
+    )
+    monkeypatch.setattr(b06_repo, "get_cross_section_designs", _async([]))
+    monkeypatch.setattr(b06_repo, "get_latest_section_options", _async({}))
+    monkeypatch.setattr(
+        structures_router,
+        "follow_structures_to_route",
+        lambda *a: order.append("structures") or {"moved": 0, "far": 0},
+    )
+    monkeypatch.setattr(
+        chain,
+        "redesign_solve_request",
+        lambda *a: b05_router.RouteSolveRequest(
+            filter_key="csf",
+            method="dtm",
+            smooth=False,
+            algorithm="as_planned",
+            bp={"x": 0, "y": 0},
+            ep={"x": 400, "y": 0},
+        ),
+    )
+    monkeypatch.setattr(b05_router, "solve_route_record", solve)
+    monkeypatch.setattr(b05_router, "confirm_latest_route", _async({}))
+    monkeypatch.setattr(watershed, "get_primary_region", watershed_must_not_run)
+    monkeypatch.setattr(watershed, "_prepare", prepare)
+    monkeypatch.setattr(drainage_pipes, "clear_pipe_points", watershed_must_not_run)
+    monkeypatch.setattr(drainage_pipes, "drainage_dir", lambda stored: drain)
+    monkeypatch.setattr(save, "_ground_along", lambda *a: (np.zeros(0), np.zeros(0)))
+    monkeypatch.setattr(b06_router, "regenerate_route_sections", regenerate)
+    monkeypatch.setattr(save, "_carry_profile", _async(None, order, "profile"))
+    monkeypatch.setattr(save, "_carry_cross", _async(2, order, "cross"))
+    monkeypatch.setattr(
+        b06_confirm, "confirm_sections", _async(SimpleNamespace(), order, "confirm")
+    )
+    monkeypatch.setattr(snapshot, "mark_designing", lambda root: None)
+    monkeypatch.setattr(snapshot, "clear_designing", lambda root: None)
+    return SimpleNamespace(
+        order=order,
+        sql=sql,
+        root=root,
+        route_file=route_file,
+        pipes_file=pipes_file,
+        long_dir=long_dir,
+        drain=drain,
+    )
+
+
+def _run(world, **kwargs):
+    old_route = {"id": 7, "route_data_path": "B05_Profile/route/route_main.geojson"}
+    return asyncio.run(
+        save.run_route_save_chain(
+            uuid4(),
+            world.root,
+            "p",
+            1,
+            {},
+            old_route,
+            [{"x": x, "y": y} for x, y in NEW],
+            {"old": 1},
+            **kwargs,
+        )
+    )
+
+
+def test_차례와_배수유역_뗌(chain_world):
+    result = _run(chain_world)
+    assert "error" not in result, result
+    assert chain_world.order == [
+        "structures",
+        "solve",
+        "pipes",
+        "sections",
+        "profile",
+        "cross",
+        "confirm",
+    ]
+    assert result["cross_dropped"] == 2 and result["drainage_stale"] is True
+    assert result["pipes"] == {"kept": 1, "crossing": 0, "concave": 0}
+    # 관 정본 = 새 노선 지문 · 배수유역 분석 지문(옛) 과 달라 B04 가 「낡음」
+    saved = json.loads(chain_world.pipes_file.read_text("utf-8"))
+    assert saved["route_signature"] == route_signature(vertices_of(NEW))
+    assert analysis_route_signature("p") != saved["route_signature"]
+    assert len(saved["points"]) == 1  # 사용자 관 그대로(지우지 않음)
+
+
+def test_실패하면_옛_노선을_되살림(chain_world, monkeypatch):
+    monkeypatch.setattr(
+        b06_confirm, "confirm_sections", _async(JSONResponse(status_code=500, content={}))
+    )
+    before_pipes = chain_world.pipes_file.read_text("utf-8")
+    result = _run(chain_world)
+    assert result["error"].startswith("종횡단 확정 실패")
+    assert json.loads(chain_world.route_file.read_text("utf-8"))["geometry"]["coordinates"] == [
+        [*p, 0] for p in OLD
+    ]
+    assert chain_world.pipes_file.read_text("utf-8") == before_pipes
+    assert json.loads((chain_world.long_dir / "longitudinal.json").read_text("utf-8")) == {
+        "stations": [],
+        "old": True,
+    }
+    assert any(
+        sql.startswith("DELETE FROM routes WHERE project_id = %s AND id > %s")
+        for sql in chain_world.sql
+    )
+    assert chain_world.order[-1] == "restore_params"
+    assert not list(chain_world.root.glob("route_save_*"))  # 손에 쥔 사본 치움
+
+
+def test_추천_종단_반영이면_균형_종단(chain_world, monkeypatch):
+    monkeypatch.setattr(
+        route_initial, "apply_profile_target", _async(None, chain_world.order, "balanced")
+    )
+    _run(chain_world, profile_target=([0.0, 456.0], [100.0, 110.0]))
+    assert "balanced" in chain_world.order and "profile" not in chain_world.order
+
+
+# ── 초기값 규칙 ───────────────────────────────────────────────────────────────
+
+
+@pytest.fixture
+def api_world(monkeypatch, tmp_path):
+    calls: list = []
+    monkeypatch.setattr(replan, "_project_paths", _async((tmp_path, "p")))
+    monkeypatch.setattr(replan, "_ensure_expected_route", lambda root: None)
+    monkeypatch.setattr(replan, "_plan_criteria", _async((20.0, 0.0, 0.0)))
+    monkeypatch.setattr(replan, "_ensure_planned_initial", lambda *a: None)
+    monkeypatch.setattr(
+        replan,
+        "_write_planned_polyline",
+        lambda *a, **k: {"vertices": 3, "curves": 0, "violations": 0},
+    )
+    monkeypatch.setattr(replan, "_recompute", _async({"route_id": 9, "total_length_m": 10.0}))
+    monkeypatch.setattr(replan, "read_initial_choice", lambda root: None)
+    monkeypatch.setattr(
+        route_initial, "refresh_initial_snapshot", lambda *a: calls.append(a) or _async(None)()
+    )
+    return calls
+
+
+def _body(**kwargs):
+    return save.RouteSaveRequest(vertices=[{"x": 0, "y": 0}, {"x": 5, "y": 5}], **kwargs)
+
+
+def test_손으로_고친_노선_저장은_초기값_그대로(api_world):
+    result = asyncio.run(replan.replan_route(uuid4(), _body()))
+    assert result["initial_refreshed"] is False and api_world == []
+
+
+def test_추천_적용은_초기값_다시(api_world):
+    result = asyncio.run(replan.replan_route(uuid4(), _body(as_initial=True)))
+    assert result["initial_refreshed"] is True and len(api_world) == 1
+
+
+def test_초안_칸이_어긋나면_400(api_world):
+    body = save.RouteSaveRequest(draft={"nodes": [[0, 0], [1, 1]], "curveOn": [True]})
+    response = asyncio.run(replan.replan_route(uuid4(), body))
+    assert response.status_code == 400
+
+
+def _longitudinal(total: float) -> dict:
+    from B05_Profile.B05_Profile_Engine_Grade import resolve_grade_options
+    from B05_Profile.B05_Profile_Engine_Grade_Profile import design_ground_following_profile
+
+    samples = [
+        {"chainage_m": float(s), "elevation_m": 100.0 + 0.05 * s + 2.0 * np.sin(s / 17.0)}
+        for s in range(int(total) + 1)
+    ]
+    stations = [{"chainage_m": float(s)} for s in range(0, int(total) + 1, 20)]
+    longitudinal = {"samples": samples, "stations": stations}
+    alignment, profile = design_ground_following_profile(
+        longitudinal, resolve_grade_options("trunk")
+    )
+    return {**longitudinal, "profile_alignment": alignment, "design_profiles": [profile]}
+
+
+def test_계획고_옮김은_앞_그대로_뒤_밂(tmp_path, monkeypatch):
+    new_xy = [list(p) for p in NEW]
+    total = float(vertices_of(NEW)[-1].chainage_m)
+    old = _longitudinal(400.0)
+    old["profile_alignment"]["edits"] = {
+        "station_offsets": {"40.000": 0.7, "200.000": -0.4, "380.000": 0.3},
+        "curve_radii": {},
+    }
+    path = tmp_path / "B06_Section" / "longitudinal" / "longitudinal.json"
+    path.parent.mkdir(parents=True)
+    path.write_text(json.dumps(_longitudinal(total)), "utf-8")
+    import B05_Profile.B05_Profile_Repository as b05_repo
+
+    monkeypatch.setattr(save, "get_db_pool", lambda: _Pool([]))
+    monkeypatch.setattr(b05_repo, "update_longitudinal_grade_summary", _async(None))
+    asyncio.run(
+        save._carry_profile(
+            tmp_path,
+            "B06_Section/longitudinal/longitudinal.json",
+            8,
+            old["profile_alignment"],
+            [list(p) for p in OLD],
+            new_xy,
+        )
+    )
+    edits = json.loads(path.read_text("utf-8"))["profile_alignment"]["edits"]["station_offsets"]
+    delta = total - 400.0
+    assert edits["40.000"] == 0.7  # 바뀐 구간 앞 — 그대로
+    assert "200.000" not in edits  # 바뀐 구간 안 — 새 지반
+    assert edits[f"{380.0 + delta:.3f}"] == 0.3  # 뒤 — 길이 차만큼 밂
+
+
+def test_저장_확정이_옛_횡단_파일을_지움(tmp_path):
+    from B05_Profile.B05_Profile_Engine_Sections import cross_filename
+
+    long_path = tmp_path / "B06_Section" / "longitudinal" / "longitudinal.json"
+    cross_dir = tmp_path / "B06_Section" / "cross_sections"
+    long_path.parent.mkdir(parents=True)
+    cross_dir.mkdir(parents=True)
+    long_path.write_text(json.dumps({"stations": [{"chainage_m": 0.0}, {"chainage_m": 20.0}]}))
+    for at in (0.0, 20.0, 37.0):
+        (cross_dir / cross_filename(at)).write_text("{}")
+    b06_confirm._prune_cross_files(tmp_path, "B06_Section/longitudinal/longitudinal.json")
+    assert sorted(p.name for p in cross_dir.glob("cross_*.json")) == sorted(
+        cross_filename(at) for at in (0.0, 20.0)
+    )
+    source = (ROOT / "B06_Section" / "B06_Section_Router_Confirm.py").read_text("utf-8")
+    for name in ("async def save_sections(", "async def confirm_sections("):
+        body = source[source.index(name) :]
+        assert body.index("_stand_patch_stations(") < body.index("_prune_cross_files,")
diff --git a/resources/tester/test_346_3_route_save_screen.py b/resources/tester/test_346_3_route_save_screen.py
new file mode 100644
index 000000000..154d25cb4
--- /dev/null
+++ b/resources/tester/test_346_3_route_save_screen.py
@@ -0,0 +1,109 @@
+"""346-3 화면 — [노선 반영] 없앰 · [저장]이 노선부터 · 추천 [적용] = as_initial 저장 · 저장 뒤 초안 넘김.
+
+노선 이음(`B05_Profile_UI_RouteEdit_Apply`)은 Node 헬퍼 `helper_346_3_route_save.cjs` 가 서버 · 화면
+창구만 가짜로 두고 돌림 · 서버 길 시험은 `test_346_3_route_save.py` · 저장 차례(노선 먼저 · 안 바뀌면
+안 보냄 · 실패 때 초안 남음)는 `test_design_store_save.py`.
+"""
+
+from __future__ import annotations
+
+import json
+import subprocess
+from pathlib import Path
+
+import pytest
+
+HERE = Path(__file__).resolve().parent
+ROOT = HERE.parents[1]
+
+
+def _read(rel: str) -> str:
+    return (ROOT / rel).read_text(encoding="utf-8")
+
+
+@pytest.fixture(scope="module")
+def out() -> dict:
+    run = subprocess.run(
+        ["node", str(HERE / "helper_346_3_route_save.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        check=True,
+    )
+    return json.loads(run.stdout)
+
+
+def test_노선_안_바뀜_안_보냄(out):
+    assert out["noneAtAll"] is None
+    assert out["unchanged"] is None  # 편집기가 정함 — 가게에 초안이 남아 있어도
+    assert out["storeOnly"]["draft"]["rev"] == 3  # 편집기 없으면 가게 routeDraft
+
+
+def test_초안은_계약_RouteDraft_꼴(out):
+    draft = out["body"]["draft"]
+    assert set(draft) == {
+        "rev",
+        "nodes",
+        "curveOn",
+        "curveRadius",
+        "curveLock",
+        "curveArc",
+        "stationSnap",
+        "terrain",
+    }
+    n = len(draft["nodes"])
+    assert all(
+        len(draft[name]) == n for name in ("curveOn", "curveRadius", "curveLock", "curveArc")
+    )
+    assert draft["curveOn"] == [True, False, True] and draft["curveRadius"] == [None, 25, None]
+    assert draft["stationSnap"] is True and draft["terrain"] == "sheet"
+    assert out["body"]["initial"] == {"mode": "follow"} and out["body"]["balanced_profile"] is True
+    assert "as_initial" not in out["body"]  # 손으로 고친 노선 = 초기값 그대로
+
+
+def test_저장_뒤_가게_초안_비움_결과_한_줄(out):
+    assert out["savedRouteId"] == 9
+    assert out["storeAfterSave"] is None
+    assert out["keptAfterSave"] == 1
+    assert out["summary"] == (
+        "노선 저장 — 관 지킴 3 · 새 교차 관 1 · 오목 보충 관 2 · 구조물 옮김 1 · 멀어짐 0 · "
+        "노선 밖 고침 3 건 · 배수유역 낡음"
+    )  # 서버 cross_dropped 1 + 화면 넘김 밖 2 = 한 줄
+
+
+def test_초안_넘김_차례(out):
+    assert out["carryCalls"] == ["invalidate:9", "load:9", "keys:9:9", "carry:7->9", "crossSave:9"]
+    assert out["outside"] == 2
+
+
+def test_추천_적용은_as_initial_저장_뒤_다시_세움(out):
+    assert out["recommendOk"] is True
+    body = out["recommendBody"]
+    assert body["as_initial"] is True and body["initial"] == {"mode": "earthwork"}
+    assert body["draft"]["nodes"] == [[1, 1], [9, 9]]
+    assert out["recommendCalls"] == ["overlay:on", "replan", "overlay:off"]  # 잠금 막 하나
+    assert out["recommendDraftsLeft"] == {"route": None, "pipes": None}  # 새 초기값에서 다시
+    assert out["rebuilt"] == 1
+
+
+def test_추천_저장_실패는_한_줄_다시_안_세움(out):
+    assert out["recommendFail"] is False
+    errors = [c for c in out["recommendFailCalls"] if c.startswith("toast:error:")]
+    assert len(errors) == 1 and "체인 실패" in errors[0]
+    assert out["rebuiltAfterFail"] == 1
+
+
+def test_노선_반영_단추_없앰_배선():
+    chrome = _read("B05_Profile/B05_Profile_UI_RouteEdit_Chrome.ts")
+    assert 'data-act="apply"' not in chrome and "노선 반영</button>" not in chrome
+    apply = _read("B05_Profile/B05_Profile_UI_RouteEdit_Apply.ts")
+    assert "addEventListener" not in apply  # 단추 듣기 없음 — [저장]이 부름
+    save = _read("A00_Common/design/design_save.ts")
+    assert save.index('"route",') < save.index('"pipes",')
+    assert "await pendingRouteSave(ctx.projectId)" in save
+    assert "carryAfterRouteSave(ctx.projectId, fromRouteId, routeId)" in save
+    initial = _read("B05_Profile/B05_Profile_UI_RouteEdit_Initial.ts")
+    at = initial.index("onApply: (picked) => {")
+    assert "saveRecommendedRoute(" in initial[at : at + 900]
+    replan = _read("B05_Profile/B05_Profile_Api_Replan.ts")
+    assert "body: JSON.stringify(body)" in replan and "as_initial?: boolean;" in replan