feat(maps): 战略地图按 objective 粒度合并（granular 通道），不同 objective 并发不再互相 409

backend/app/api/maps.py

@@ -9,6 +9,7 @@ from app.auth_middleware import require_auth, require_role
 from app.models import StrategicMap, OperationLog, MapObjective, Objective, KR, KPIDefinition, ReviewRecord, User
 from app.utils.kr_name import sanitize_kr_name
 from app.utils.kpi_value_scope import actual_only_clause
+import copy
 import json
 import logging
 
@@ -151,16 +152,8 @@ def _norm_stamp(raw) -> Optional[datetime]:
     return dt.replace(microsecond=0)
 
 
-def assert_map_not_stale(m: StrategicMap, data: dict):
-    """覆写 dimensions/canvas_data 前的前置校验
-
-    - 不涉及护栏字段（或值为 None ⇒ 不会被赋值）→ 直接放行（如 MapList 只改 title/version）；
-    - 缺基准 / 基准不可解析 / 基准与服务端现值不符 → 409（fail-closed：宁拒不覆写）；
-    - 409 响应体带 detail 文案，响应头带 X-CMA-Concurrency-Code 与 X-CMA-Map-Updated-At。
-    """
-    overwriting = [k for k in CONCURRENCY_GUARDED_FIELDS if k in data and data.get(k) is not None]
-    if not overwriting:
-        return
+def _require_base_stamp(m: StrategicMap, data: dict) -> datetime:
+    """并发基准唯一取值口：缺失 / 不可解析 → 409 fail-closed（调用方据此保证「一行都不改」）"""
     base_raw = None
     for k in CONCURRENCY_BASE_KEYS:
         if data.get(k) is not None:
@@ -172,20 +165,244 @@ def assert_map_not_stale(m: StrategicMap, data: dict):
         detail = "缺少并发基准(base_updated_at)：覆写战略地图内容须携带载入时的 updated_at"
     else:
         base = _norm_stamp(base_raw)
-        if base is None:
+        if base is not None:
+            return base
         code = "concurrency_base_invalid"
         detail = "并发基准(base_updated_at)格式无法解析"
-        elif base != _norm_stamp(m.updated_at):
-            code = "stale_map"
-            detail = "地图已被修改，刷新后重试"
-        else:
-            return
     raise HTTPException(409, detail, headers={
         "X-CMA-Concurrency-Code": code,
         "X-CMA-Map-Updated-At": current or "",
     })
 
 
+def assert_map_not_stale(m: StrategicMap, data: dict, fields=CONCURRENCY_GUARDED_FIELDS):
+    """覆写 <fields> 前的前置校验（A 兜底 —— 本单不得移除）
+
+    - 不涉及护栏字段（或值为 None ⇒ 不会被赋值）→ 直接放行（如 MapList 只改 title/version）；
+    - 缺基准 / 基准不可解析 / 基准与服务端现值不符 → 409（fail-closed：宁拒不覆写）；
+    - 409 响应体带 detail 文案，响应头带 X-CMA-Concurrency-Code 与 X-CMA-Map-Updated-At。
+    - fields 参数供 P2 的按 objective 粒度通道复用（该通道只对 canvas_data 沿用本粒度）。
+    """
+    overwriting = [k for k in fields if k in data and data.get(k) is not None]
+    if not overwriting:
+        return
+    base = _require_base_stamp(m, data)
+    if base != _norm_stamp(m.updated_at):
+        raise HTTPException(409, "地图已被修改，刷新后重试", headers={
+            "X-CMA-Concurrency-Code": "stale_map",
+            "X-CMA-Map-Updated-At": _stamp(m.updated_at) or "",
+        })
+
+
+# ── 按 objective 粒度合并（P2 cma-strategy-map-objective-merge, 2026-10-12）──────
+# 残留面（A 落地后）：dimensions 仍是整表提交与覆写 ⇒ 两个会话编辑同一地图的**不同** objective 时，
+# 后到者带过期基准被 409 拒绝：安全，但用户被迫整页刷新重做，且 409 语义被稀释
+# （真冲突与「互不相干的并发」同码）。
+#
+# 本层把写通道从「整表覆写」收敛为「按 objective 粒度合并」：服务端保留未被本地改动的节点
+# （含他方新增/删除的节点），仅对本地脏项做增/改/删；校验仍在任何写之前完成。
+#
+# 请求契约（全部沿用既有列，不新增表/列）：
+#   dimensions         本地快照（结构/顺序；未标脏的节点内容服务端一律不采纳）
+#   dirty_objectives   [{"dim_key": "finance", "objective_id": 12|null, "name": "目标A",
+#                        "base": {...}(客户端载入时该目标的服务端原文)|null(本地新增),
+#                        "value": {...}(新值)|null(本地删除)}]
+#   canvas_data        与库内现值一致 ⇒ 视为未改动（不覆写）；有实质差异 ⇒ 退回 A 的 map 级校验
+#   base_updated_at    仍必需（缺失/不可解析 → 409，与 A 同）
+#
+# 冲突判定：脏项 base 与服务端现值不一致 ⇒ **同一 objective** 被并发改 ⇒ 409
+#   X-CMA-Concurrency-Code: stale_objective（内容冲突）/ stale_objective_missing（已被他人删除）
+DIRTY_OBJECTIVES_KEY = "dirty_objectives"
+
+
+def _is_granular_payload(data: dict) -> bool:
+    """按 objective 粒度通道的开关：请求携带 dirty_objectives 列表（旧调用方不带 ⇒ 旧整表语义）"""
+    return isinstance(data.get(DIRTY_OBJECTIVES_KEY), list)
+
+
+def _dims_list(raw) -> list:
+    """dimensions 容错读：str / None / 非 list → []；只保留 dict 元素"""
+    if isinstance(raw, str):
+        try:
+            raw = json.loads(raw)
+        except ValueError:
+            raw = []
+    if not isinstance(raw, list):
+        return []
+    return [d for d in raw if isinstance(d, dict)]
+
+
+def _obj_tag(o) -> Optional[int]:
+    """objective 的服务端行 id（_objective_id / objective_id），无则 None"""
+    if not isinstance(o, dict):
+        return None
+    raw = o.get("_objective_id")
+    if raw is None:
+        raw = o.get("objective_id")
+    if raw is None:
+        return None
+    try:
+        return int(raw)
+    except (TypeError, ValueError):
+        return None
+
+
+def _obj_key(dim_key: str, o) -> tuple:
+    """objective 稳定标识：优先行 id，退化到 (维度, 名称)"""
+    tag = _obj_tag(o)
+    if tag is not None:
+        return (dim_key, "id", tag)
+    return (dim_key, "name", str((o or {}).get("name") or "").strip())
+
+
+def _obj_name_key(dim_key: str, o) -> tuple:
+    return (dim_key, "name", str((o or {}).get("name") or "").strip())
+
+
+def _canon_obj(o) -> str:
+    """objective 内容归一化（并发冲突比对）：丢 _ 前缀簿记键 / None / 空串，稳定序列化"""
+    def clean(v):
+        if isinstance(v, dict):
+            return {k: clean(x) for k, x in v.items()
+                    if not str(k).startswith("_") and x is not None and x != ""}
+        if isinstance(v, list):
+            return [clean(x) for x in v]
+        return v
+    return json.dumps(clean(o or {}), ensure_ascii=False, sort_keys=True)
+
+
+def _canon_json(v) -> str:
+    return json.dumps(v, ensure_ascii=False, sort_keys=True, default=str)
+
+
+def _canon_canvas(v) -> str:
+    """canvas_data 归一化：None / {} / {'connections': []} 等价 ⇒ 视为「无改动」"""
+    if not isinstance(v, dict):
+        return _canon_json({"connections": []})
+    conns = v.get("connections")
+    return _canon_json({"connections": conns if isinstance(conns, list) else []})
+
+
+def _find_objective(dim: dict, probe, dim_key: str) -> Optional[int]:
+    """在 dim.objectives 中定位（先按行 id，退化按名称）；返回下标，未命中 None"""
+    objs = dim.get("objectives") or []
+    key = _obj_key(dim_key, probe)
+    name_key = _obj_name_key(dim_key, probe)
+    for i, o in enumerate(objs):
+        if _obj_key(dim_key, o) == key:
+            return i
+    for i, o in enumerate(objs):
+        if _obj_key(dim_key, o) == name_key:
+            return i
+    return None
+
+
+def _raise_stale_objective(m: StrategicMap, name: str, why: str):
+    raise HTTPException(409, f"目标「{name}」{why}，刷新后重试", headers={
+        "X-CMA-Concurrency-Code": "stale_objective",
+        "X-CMA-Map-Updated-At": _stamp(m.updated_at) or "",
+    })
+
+
+def _merge_dimensions_by_objective(m: StrategicMap, data: dict):
+    """按 objective 粒度合并 dimensions；与库内现值等价时返回 None（调用方不写该字段）
+
+    顺序：
+      ① 冲突校验（全部脏项，任何写之前）：脏项 base（客户端载入时原文）≠ 服务端现值 ⇒ 409；
+      ② 合并：仅对脏项增/改/删，服务端其余节点（含他方新增）原样保留；
+      ③ 顺序：本地脏过的维度按提交快照顺序重排（服务端独有节点稳定排末尾）；
+      ④ 维度层元数据不在本粒度内（无编辑入口）⇒ 服务端保留现值，新维度取提交元数据。
+    """
+    dims_in = _dims_list(data.get("dimensions"))
+    dirty = [e for e in (data.get(DIRTY_OBJECTIVES_KEY) or []) if isinstance(e, dict)]
+    current = copy.deepcopy(_dims_list(m.dimensions))
+    submitted_by_key = {d.get("key") or "": d for d in dims_in}
+    server_by_key = {d.get("key") or "": d for d in current}
+
+    # ── ① 冲突校验（fail-closed：任一脏项冲突即整体 409，此处尚未动任何数据）──
+    for e in dirty:
+        base = e.get("base")
+        if base is None:
+            continue                                   # 本地新增：无基准可比
+        dk = e.get("dim_key") or ""
+        srv_dim = server_by_key.get(dk)
+        srv_obj = None
+        if srv_dim is not None:
+            pos = _find_objective(srv_dim, e, dk)
+            if pos is not None:
+                srv_obj = (srv_dim.get("objectives") or [])[pos]
+        name = str(e.get("name") or (base or {}).get("name") or "")
+        if srv_obj is None:
+            _raise_stale_objective(m, name, "已被他人删除")
+        if _canon_obj(srv_obj) != _canon_obj(base):
+            _raise_stale_objective(m, name, "已被他人修改")
+
+    # ── ② 合并 ──
+    merged = copy.deepcopy(current)
+    merged_by_key = {d.get("key") or "": d for d in merged}
+    touched = []
+    for e in dirty:
+        dk = e.get("dim_key") or ""
+        dim = merged_by_key.get(dk)
+        if dim is None:
+            sub = submitted_by_key.get(dk) or {"key": dk}
+            dim = {"key": dk, "name": sub.get("name") or sub.get("label") or dk,
+                   "icon": sub.get("icon"), "color": sub.get("color"), "objectives": []}
+            merged.append(dim)
+            merged_by_key[dk] = dim
+        if dk not in touched:
+            touched.append(dk)
+        value = e.get("value")
+        if value is None:                              # 本地删除：定位不到 ⇒ 已被他人删除（幂等）
+            pos = _find_objective(dim, e, dk)
+            if pos is not None:
+                dim.setdefault("objectives", []).pop(pos)
+            continue
+        if e.get("base") is None:                      # 本地新增：追加（绝不覆盖服务端既有同名节点）
+            dim.setdefault("objectives", []).append(copy.deepcopy(value))
+            continue
+        pos = _find_objective(dim, e, dk)
+        if pos is None:
+            dim.setdefault("objectives", []).append(copy.deepcopy(value))
+        else:
+            dim["objectives"][pos] = copy.deepcopy(value)
+
+    # ── ③ 顺序：本地脏过的维度按提交快照重排 ──
+    for dk in touched:
+        dim = merged_by_key[dk]
+        sub_objs = (submitted_by_key.get(dk) or {}).get("objectives") or []
+        ranks = []
+        for o in sub_objs:
+            ranks.append(_obj_key(dk, o))
+            ranks.append(_obj_name_key(dk, o))
+
+        def _rank(o, ranks=ranks, dk=dk):
+            for cand in (_obj_key(dk, o), _obj_name_key(dk, o)):
+                if cand in ranks:
+                    return ranks.index(cand)
+            return len(ranks)
+
+        dim["objectives"] = sorted(dim.get("objectives") or [], key=_rank)
+
+    if _canon_json(merged) == _canon_json(current):
+        return None
+    return merged
+
+
+def _guard_canvas_data_granular(m: StrategicMap, data: dict):
+    """granular 通道下 canvas_data 的护栏：
+    与库内现值一致（含 None / {} / {'connections': []} 等价）⇒ 视为未改动，剔除该字段不覆写；
+    有实质差异 ⇒ 退回 A 的 map 级基准校验（过期 ⇒ 409 stale_map）。
+    """
+    if data.get("canvas_data") is None:
+        data.pop("canvas_data", None)
+        return
+    if _canon_canvas(data["canvas_data"]) == _canon_canvas(m.canvas_data):
+        data.pop("canvas_data", None)
+        return
+    assert_map_not_stale(m, data, fields=("canvas_data",))
+
+
 @router.put("/{map_id}")
 def update_map(map_id: int, data: dict, db: Session = Depends(get_db), entity_id: int = Depends(get_entity_id)):
     m = db.query(StrategicMap).filter(StrategicMap.id == map_id).first()
@@ -195,11 +412,24 @@ def update_map(map_id: int, data: dict, db: Session = Depends(get_db), entity_id
     if m.entity_id != entity_id:
         raise HTTPException(404, "战略地图不存在")
 
-    # 并发保护（2026-10-12）: 覆写 dimensions/canvas_data 前校验客户端基准，过期快照 → 409，
-    # 不得静默覆写；校验不过时后续任何 setattr/删行/同步都不执行。
+    # 并发保护（A 兜底 2026-10-12 + 按 objective 粒度合并 P2 2026-10-12）:
+    # - 旧调用方（不带 dirty_objectives）⇒ 整表语义不变：覆写 dimensions/canvas_data 前校验基准；
+    # - 带 dirty_objectives ⇒ 按 objective 粒度合并：基准仍必需（fail-closed），但只有「同一 objective」
+    #   被并发改才 409（stale_objective）；他方在其它 objective 上的改动被保留而非拒绝。
+    # 校验全部在任何 setattr/删行/同步之前完成 ⇒ 校验不过时一行都不改。
+    if _is_granular_payload(data):
+        _require_base_stamp(m, data)
+        _guard_canvas_data_granular(m, data)
+        merged_dims = _merge_dimensions_by_objective(m, data)
+        if merged_dims is None:
+            data.pop("dimensions", None)      # 合并结果与库内现值等价 ⇒ 不写该字段
+        else:
+            data["dimensions"] = merged_dims
+    else:
         assert_map_not_stale(m, data)
-    # 基准字段不是业务字段，剔除后不参与赋值
-    data = {k: v for k, v in data.items() if k not in CONCURRENCY_BASE_KEYS}
+    # 基准字段/脏项明细不是业务字段，剔除后不参与赋值
+    data = {k: v for k, v in data.items()
+            if k not in CONCURRENCY_BASE_KEYS and k != DIRTY_OBJECTIVES_KEY}
 
     old_status = m.status
     # 安全白名单: 只允许编辑业务字段, 禁止 entity_id 等敏感字段被请求体篡改 (OpenCode审查#7)

backend/tests/test_map_objective_merge_20261012.py

@@ -0,0 +1,355 @@
+"""按 objective 粒度合并（P2 cma-strategy-map-objective-merge, 2026-10-12）
+
+残留面（A 上线后）：dimensions 仍是整表提交与覆写 ⇒ 两个会话编辑同一地图的**不同** objective 时，
+后到者带过期基准被 409 拒绝（安全，但体验有税；409 语义被稀释）。
+
+本文件断言 P2 落地后的语义：
+  - 不同 objective 并发改 ⇒ 两个会话都 200，双方改动都在（他方新增/删除的节点被保留，不被整表回置）；
+  - 同一 objective 并发改 ⇒ 后者 409（X-CMA-Concurrency-Code: stale_objective），且一行都不改；
+  - 无脏项 ⇒ 不写（即使基准已过期也不 409、也不覆写）；
+  - canvas_data：与库内现值一致 ⇒ 不参与覆写；有实质差异 ⇒ 退回 A 的 map 级校验（过期 409 stale_map）；
+  - granular 通道仍要求基准（缺/不可解析 → 409）；A 的整表兜底不得移除（对照用例逐条验证）。
+
+时间戳说明：库内 updated_at 由 SQLite 的 func.now()（秒级）产生，用例内的连续写无法自然拉开时刻，
+故用 `_advance()` 显式推进 updated_at 若干秒，模拟「他方写已落库、本地基准已过期」的生产时刻差。
+它只改时间戳，不改任何业务列，也不改断言目标。
+
+用内存 SQLite（conftest），零生产库/零生产 Redis。
+"""
+import copy
+from datetime import timedelta
+
+from app.models import MapObjective, StrategicMap
+from tests.conftest import auth_header, create_test_user, get_token_for_user
+
+BASE = "2026-10-12T09:36:02"
+
+
+def _dims(tag, names=("目标A", "目标B")):
+    """两层维度结构：finance 带 objectives（名称可控），customer 空"""
+    return [
+        {"key": "finance", "name": "财务层", "icon": "💰", "color": "#F56C6C",
+         "objectives": [{"name": n, "description": f"{tag}-{n}"} for n in names]},
+        {"key": "customer", "name": "客户层", "icon": "👥", "color": "#409EFF", "objectives": []},
+    ]
+
+
+def _mk_user_and_token(client, db):
+    create_test_user(db, username="mapadmin", role="ceo")
+    return get_token_for_user(client, username="mapadmin")
+
+
+def _create_map(client, headers, title="MERGE-P2", names=("目标A", "目标B")):
+    resp = client.post("/api/cma/maps", headers=headers, json={
+        "title": title, "dimensions": _dims("初始", names), "canvas_data": {"connections": []},
+    })
+    assert resp.status_code == 200, resp.text
+    return resp.json()
+
+
+def _snapshot(client, headers, map_id):
+    """会话载入：GET /maps 取该地图（含 updated_at 基准 + dimensions 原文）"""
+    return next(x for x in client.get("/api/cma/maps", headers=headers).json()["data"] if x["id"] == map_id)
+
+
+def _advance(db, map_id, seconds=30):
+    """显式推进服务端 updated_at：模拟「他方写落库后本地基准已过期」的时刻差（只动时间戳）"""
+    db.expire_all()
+    m = db.query(StrategicMap).filter(StrategicMap.id == map_id).first()
+    m.updated_at = (m.updated_at or m.created_at) + timedelta(seconds=seconds)
+    db.commit()
+    db.expire_all()
+
+
+def _map_dims(db, map_id):
+    db.expire_all()
+    m = db.query(StrategicMap).filter(StrategicMap.id == map_id).first()
+    return copy.deepcopy(m.dimensions)
+
+
+def _fin_objs(db, map_id):
+    """finance 层 objectives（存库顺序）"""
+    for d in _map_dims(db, map_id):
+        if d.get("key") == "finance":
+            return d.get("objectives") or []
+    return []
+
+
+def _obj_rows(db, map_id):
+    """map_objectives 行（id, name, sort_order）：用于证明 409 时一行都不改"""
+    db.expire_all()
+    return [(o.id, o.name, o.sort_order) for o in
+            db.query(MapObjective).filter(MapObjective.map_id == map_id)
+            .order_by(MapObjective.sort_order, MapObjective.id).all()]
+
+
+def _dirty(dim_key, name, base, value):
+    return {"dim_key": dim_key, "objective_id": None, "name": name, "base": base, "value": value}
+
+
+def _put(client, headers, map_id, dims, dirty, base, canvas=None):
+    payload = {"dimensions": dims, "dirty_objectives": dirty, "base_updated_at": base}
+    if canvas is not None:
+        payload["canvas_data"] = canvas
+    return client.put(f"/api/cma/maps/{map_id}", headers=headers, json=payload)
+
+
+# ── ① 不同 objective 并发 ⇒ 均成功且双方改动都在 ────────────────────────
+
+def test_two_sessions_edit_different_objectives_both_land(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap_a = _snapshot(client, h, m["id"])
+    snap_b = _snapshot(client, h, m["id"])
+    base = snap_a["updated_at"]
+
+    # 会话A：改 目标A
+    dims_a = copy.deepcopy(snap_a["dimensions"])
+    dims_a[0]["objectives"][0]["description"] = "A改"
+    r1 = _put(client, h, m["id"], dims_a,
+              [_dirty("finance", "目标A", snap_a["dimensions"][0]["objectives"][0],
+                      dims_a[0]["objectives"][0])],
+              base, canvas=snap_a["canvas_data"])
+    assert r1.status_code == 200, r1.text
+
+    _advance(db, m["id"], 30)          # 时钟推进 ⇒ 会话B 的基准确定过期
+
+    # 会话B：改 目标B（改的是**不同** objective ⇒ 不应被 409 拒）
+    dims_b = copy.deepcopy(snap_b["dimensions"])
+    dims_b[0]["objectives"][1]["description"] = "B改"
+    r2 = _put(client, h, m["id"], dims_b,
+              [_dirty("finance", "目标B", snap_b["dimensions"][0]["objectives"][1],
+                      dims_b[0]["objectives"][1])],
+              base, canvas=snap_b["canvas_data"])
+    assert r2.status_code == 200, r2.text
+
+    fin = _fin_objs(db, m["id"])
+    assert [o["name"] for o in fin] == ["目标A", "目标B"]
+    assert fin[0]["description"] == "A改"      # 会话A 的改动保留
+    assert fin[1]["description"] == "B改"      # 会话B 的改动落库
+    assert len(_obj_rows(db, m["id"])) == 2
+
+    # 对照（A 的整表兜底不得移除）：同一份过期快照走旧通道（去掉 dirty_objectives）⇒ 409
+    # 注：服务端每次写都会把 updated_at 刷成真实 now（SQLite func.now()，秒级），
+    #    故对照前需再推进一次时刻，才能真正落到「基准过期」的生产形态。
+    _advance(db, m["id"], 90)
+    legacy = client.put(f"/api/cma/maps/{m['id']}", headers=h, json={
+        "dimensions": dims_b, "canvas_data": snap_b["canvas_data"], "base_updated_at": base,
+    })
+    assert legacy.status_code == 409, legacy.text
+    assert legacy.headers["X-CMA-Concurrency-Code"] == "stale_map"
+
+
+# ── ② 同一 objective 并发 ⇒ 后者 409，且一行都不改 ───────────────────────
+
+def test_same_objective_concurrent_second_is_409_and_nothing_changes(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap_a = _snapshot(client, h, m["id"])
+    snap_b = _snapshot(client, h, m["id"])
+    base = snap_a["updated_at"]
+
+    dims_a = copy.deepcopy(snap_a["dimensions"])
+    dims_a[0]["objectives"][0]["description"] = "A改"
+    assert _put(client, h, m["id"], dims_a,
+                [_dirty("finance", "目标A", snap_a["dimensions"][0]["objectives"][0],
+                        dims_a[0]["objectives"][0])], base).status_code == 200
+
+    _advance(db, m["id"], 30)
+    rows_before = _obj_rows(db, m["id"])
+
+    dims_b = copy.deepcopy(snap_b["dimensions"])
+    dims_b[0]["objectives"][0]["description"] = "B改"
+    r = _put(client, h, m["id"], dims_b,
+             [_dirty("finance", "目标A", snap_b["dimensions"][0]["objectives"][0],
+                     dims_b[0]["objectives"][0])], base)
+    assert r.status_code == 409, r.text
+    assert r.headers["X-CMA-Concurrency-Code"] == "stale_objective"
+    assert "目标A" in r.json()["detail"]
+    assert r.headers["X-CMA-Map-Updated-At"]
+
+    assert _obj_rows(db, m["id"]) == rows_before                  # 行一行不动（含 id）
+    assert _fin_objs(db, m["id"])[0]["description"] == "A改"        # 内容不被回置
+
+
+# ── ③ 他方新增的节点被保留（残留缺陷面：不再被整表覆写删掉）────────────
+
+def test_granular_merge_preserves_objective_added_by_other_session(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap_a = _snapshot(client, h, m["id"])
+    snap_b = _snapshot(client, h, m["id"])
+
+    # 会话A：新增 目标C（base=None ⇒ 本地新增）
+    dims_a = copy.deepcopy(snap_a["dimensions"])
+    dims_a[0]["objectives"].append({"name": "目标C", "description": "A新增"})
+    r1 = _put(client, h, m["id"], dims_a,
+              [_dirty("finance", "目标C", None, dims_a[0]["objectives"][2])],
+              snap_a["updated_at"])
+    assert r1.status_code == 200, r1.text
+    assert [o["name"] for o in _fin_objs(db, m["id"])] == ["目标A", "目标B", "目标C"]
+
+    _advance(db, m["id"], 30)
+
+    # 会话B（快照里没有 目标C）：改 目标B ⇒ 200，且 目标C 必须还在
+    dims_b = copy.deepcopy(snap_b["dimensions"])
+    dims_b[0]["objectives"][1]["description"] = "B改"
+    r2 = _put(client, h, m["id"], dims_b,
+              [_dirty("finance", "目标B", snap_b["dimensions"][0]["objectives"][1],
+                      dims_b[0]["objectives"][1])],
+              snap_b["updated_at"])
+    assert r2.status_code == 200, r2.text
+
+    fin = _fin_objs(db, m["id"])
+    assert [o["name"] for o in fin] == ["目标A", "目标B", "目标C"]
+    assert fin[1]["description"] == "B改"
+    assert fin[2]["description"] == "A新增"          # 他方新增节点未被本地过期快照删掉
+    assert len(_obj_rows(db, m["id"])) == 3           # map_objectives 行同样未被删
+
+
+# ── ④ 本地删除只删本地目标；未标脏的本地快照不回置服务端 ────────────────
+
+def test_granular_delete_removes_only_local_target(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap_a = _snapshot(client, h, m["id"])
+    snap_b = _snapshot(client, h, m["id"])
+
+    # 会话A：删除 目标A（value=None）
+    dims_a = copy.deepcopy(snap_a["dimensions"])
+    dims_a[0]["objectives"] = [o for o in dims_a[0]["objectives"] if o["name"] != "目标A"]
+    r1 = _put(client, h, m["id"], dims_a,
+              [_dirty("finance", "目标A", snap_a["dimensions"][0]["objectives"][0], None)],
+              snap_a["updated_at"])
+    assert r1.status_code == 200, r1.text
+    assert [o["name"] for o in _fin_objs(db, m["id"])] == ["目标B"]
+
+    _advance(db, m["id"], 30)
+
+    # 会话B（快照里仍有 目标A，但没有标脏它）：改 目标B ⇒ 200，且不得把 目标A 复活
+    dims_b = copy.deepcopy(snap_b["dimensions"])
+    dims_b[0]["objectives"][1]["description"] = "B改"
+    r2 = _put(client, h, m["id"], dims_b,
+              [_dirty("finance", "目标B", snap_b["dimensions"][0]["objectives"][1],
+                      dims_b[0]["objectives"][1])],
+              snap_b["updated_at"])
+    assert r2.status_code == 200, r2.text
+
+    fin = _fin_objs(db, m["id"])
+    assert [o["name"] for o in fin] == ["目标B"]
+    assert fin[0]["description"] == "B改"
+
+
+# ── ⑤ 无脏项 ⇒ 不写（过期基准也不 409、也不覆写）──────────────────────
+
+def test_granular_noop_payload_does_not_write_nor_409(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap = _snapshot(client, h, m["id"])
+
+    dims = copy.deepcopy(snap["dimensions"])
+    dims[0]["objectives"][0]["description"] = "A改"
+    assert _put(client, h, m["id"], dims,
+                [_dirty("finance", "目标A", snap["dimensions"][0]["objectives"][0],
+                        dims[0]["objectives"][0])], snap["updated_at"]).status_code == 200
+    after = _snapshot(client, h, m["id"])
+    rows_after = _obj_rows(db, m["id"])
+
+    _advance(db, m["id"], 30)
+
+    # 会话B：全量快照仍是载入时的旧内容、无脏项、连线一致 ⇒ 未改动 ⇒ 不写、不 409
+    r = _put(client, h, m["id"], snap["dimensions"], [], snap["updated_at"],
+             canvas=snap["canvas_data"])
+    assert r.status_code == 200, r.text
+
+    now = _snapshot(client, h, m["id"])
+    assert now["updated_at"] == after["updated_at"]          # 无写 ⇒ 基准未被推进
+    assert _fin_objs(db, m["id"])[0]["description"] == "A改"    # 且未被本地过期快照回置
+    assert _obj_rows(db, m["id"]) == rows_after
+
+
+# ── ⑥ granular 通道仍 fail-closed：基准必需 ────────────────────────────
+
+def test_granular_still_requires_base(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap = _snapshot(client, h, m["id"])
+    dims = copy.deepcopy(snap["dimensions"])
+    dirty = [_dirty("finance", "目标A", snap["dimensions"][0]["objectives"][0],
+                    dims[0]["objectives"][0])]
+
+    missing = client.put(f"/api/cma/maps/{m['id']}", headers=h,
+                         json={"dimensions": dims, "dirty_objectives": dirty})
+    assert missing.status_code == 409, missing.text
+    assert missing.headers["X-CMA-Concurrency-Code"] == "concurrency_base_required"
+
+    bad = client.put(f"/api/cma/maps/{m['id']}", headers=h,
+                     json={"dimensions": dims, "dirty_objectives": dirty,
+                           "base_updated_at": "not-a-timestamp"})
+    assert bad.status_code == 409, bad.text
+    assert bad.headers["X-CMA-Concurrency-Code"] == "concurrency_base_invalid"
+    assert len(_obj_rows(db, m["id"])) == 2
+
+
+# ── ⑦ canvas_data：一致 ⇒ 不覆写；有差异 + 过期基准 ⇒ 409 stale_map ─────
+
+def test_granular_canvas_data_rules(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap = _snapshot(client, h, m["id"])
+    dims = copy.deepcopy(snap["dimensions"])
+    dims[0]["objectives"][0]["description"] = "A改"
+    assert _put(client, h, m["id"], dims,
+                [_dirty("finance", "目标A", snap["dimensions"][0]["objectives"][0],
+                        dims[0]["objectives"][0])], snap["updated_at"]).status_code == 200
+
+    _advance(db, m["id"], 30)
+
+    dirty_b = [_dirty("finance", "目标B", snap["dimensions"][0]["objectives"][1],
+                      snap["dimensions"][0]["objectives"][1])]
+
+    # 连线有实质差异（新增一条）+ 过期基准 ⇒ 退回 A 的 map 级校验 → 409
+    stale_canvas = _put(client, h, m["id"], snap["dimensions"], dirty_b, snap["updated_at"],
+                        canvas={"connections": [{"from": "finance-0", "to": "customer-0"}]})
+    assert stale_canvas.status_code == 409, stale_canvas.text
+    assert stale_canvas.headers["X-CMA-Concurrency-Code"] == "stale_map"
+
+    # 连线与库内现值一致 ⇒ 不参与覆写 ⇒ 只有脏 objective 走合并 → 200
+    ok = _put(client, h, m["id"], snap["dimensions"], dirty_b, snap["updated_at"],
+              canvas=snap["canvas_data"])
+    assert ok.status_code == 200, ok.text
+    db.expire_all()
+    cur = db.query(StrategicMap).filter(StrategicMap.id == m["id"]).first()
+    assert cur.canvas_data.get("connections") in ([], None)      # 连线未被本地旧快照覆写
+    assert [o["name"] for o in _fin_objs(db, m["id"])] == ["目标A", "目标B"]
+
+
+# ── ⑧ 本地重排（全部标脏、内容不变）⇒ 顺序被采纳，他方节点稳定排末尾 ────
+
+def test_granular_reorder_adopted_and_foreign_node_kept_last(client, db):
+    h = auth_header(_mk_user_and_token(client, db))
+    m = _create_map(client, h)
+    snap_a = _snapshot(client, h, m["id"])
+    snap_b = _snapshot(client, h, m["id"])
+
+    dims_a = copy.deepcopy(snap_a["dimensions"])
+    dims_a[0]["objectives"].append({"name": "目标C", "description": "A新增"})
+    assert _put(client, h, m["id"], dims_a,
+                [_dirty("finance", "目标C", None, dims_a[0]["objectives"][2])],
+                snap_a["updated_at"]).status_code == 200
+
+    _advance(db, m["id"], 30)
+
+    # 会话B：本地重排 [目标B, 目标A]（内容不变 ⇒ base 与服务端一致）
+    dims_b = copy.deepcopy(snap_b["dimensions"])
+    dims_b[0]["objectives"] = [dims_b[0]["objectives"][1], dims_b[0]["objectives"][0]]
+    dirty_b = [
+        _dirty("finance", "目标B", snap_b["dimensions"][0]["objectives"][1], dims_b[0]["objectives"][0]),
+        _dirty("finance", "目标A", snap_b["dimensions"][0]["objectives"][0], dims_b[0]["objectives"][1]),
+    ]
+    r = _put(client, h, m["id"], dims_b, dirty_b, snap_b["updated_at"])
+    assert r.status_code == 200, r.text
+
+    fin = _fin_objs(db, m["id"])
+    assert [o["name"] for o in fin] == ["目标B", "目标A", "目标C"]   # 本地顺序采纳；他方节点排末尾
+    assert [row[2] for row in _obj_rows(db, m["id"])] == [0, 1, 2]

frontend/src/views/MapCanvas.vue

@@ -222,6 +222,15 @@ const { markDirty, markClean } = useFormGuard(isDirty)
 const baseUpdatedAt = ref<string | null>(null)
 // 收到 409（服务端已被他人修改）后置位：停止自动保存，绝不重试覆写
 const autoSaveBlocked = ref(false)
+// ── 按 objective 粒度合并的基线（P2 2026-10-12）────────────────────────
+// 写通道从「整表覆写」收敛为「只提交本地脏的 objective」：
+//   baseServerDims = /maps 返回的 dimensions 原始副本（补层/迁移之前）⇒ 脏项的 base（并发基准）取自此处，
+//                    与服务端库内现值同源，故「同一 objective 并发改」判据不会因本地修补而误报；
+//   loadedDims     = 载入 + 本地修补（ensureFourLayers / 旧格式迁移）后的副本 ⇒ 脏判据基线；
+//   loadedCanvas   = 载入时连线快照 ⇒ 连线是否本地改动的判据（未改则不提交 canvas_data）。
+let baseServerDims: any[] = []
+let loadedDims: any[] = []
+let loadedCanvas: any[] = []
 const allKpis = ref<any[]>([])
 const kpiNameMap = reactive<Record<string, string>>({})
 
@@ -496,6 +505,9 @@ function loadCanvas() {
     // 并发基准：本地快照对应服务端 updated_at（后续保存须带此基准）
     baseUpdatedAt.value = map?.updated_at || null
     autoSaveBlocked.value = false
+    // 服务端原文快照（补层/迁移之前）⇒ 脏项的 base 与服务端库内现值同源（P2 按 objective 粒度合并）
+    baseServerDims = deepClone(map?.dimensions || [])
+    loadedCanvas = deepClone(map?.canvas_data?.connections || [])
     if (map?.dimensions) {
       for (const dim of map.dimensions) {
         dimensions.push({
@@ -511,6 +523,8 @@ function loadCanvas() {
     ensureFourLayers()
     // 数据迁移：旧格式 kpis[] → krs[]
     migrateOldKpiFormat()
+    // 载入基线（本地修补后）⇒ 脏判据基线（迁移新增的 krs 不算本地改动）
+    loadedDims = deepClone(dimensions)
     connections.value = map?.canvas_data?.connections || []
     loading.value = false
     nextTick(() => {
@@ -522,6 +536,9 @@ function loadCanvas() {
   }).catch(() => {
     ensureFourLayers()
     baseUpdatedAt.value = null   // 载入失败 ⇒ 无基准（服务端 fail-closed）
+    baseServerDims = []
+    loadedDims = deepClone(dimensions)
+    loadedCanvas = []
     loading.value = false
   })
 }
@@ -1076,6 +1093,131 @@ function migrateOldKpiFormat() {
   }
 }
 
+// ── 按 objective 粒度提交（P2 2026-10-12）──────────────────────────────
+function deepClone<T>(v: T): T { return JSON.parse(JSON.stringify(v ?? null)) as T }
+
+/** objective 的服务端行 id（回写件 _objective_id / objective_id）；无则 null */
+function objIdOf(o: any): number | null {
+  const raw = o?._objective_id ?? o?.objective_id
+  const n = Number(raw)
+  return Number.isFinite(n) && n > 0 ? n : null
+}
+
+/** 归一化序列化：丢 _ 前缀簿记键 / null / 空串（与服务端 _canon_obj 同口径） */
+function canonJson(v: any): string {
+  const clean = (x: any): any => {
+    if (Array.isArray(x)) return x.map(clean)
+    if (x && typeof x === 'object') {
+      const out: Record<string, any> = {}
+      for (const k of Object.keys(x).sort()) {
+        if (k.startsWith('_') || x[k] === null || x[k] === undefined || x[k] === '') continue
+        out[k] = clean(x[k])
+      }
+      return out
+    }
+    return x
+  }
+  return JSON.stringify(clean(v))
+}
+
+/** 在目标列表里按行 id → 名称定位（与服务端 _find_objective 同序） */
+function findObjective(list: any[], probe: any): any | null {
+  const objs = list || []
+  const id = objIdOf(probe)
+  if (id !== null) {
+    const hit = objs.find((o: any) => objIdOf(o) === id)
+    if (hit) return hit
+  }
+  const name = String(probe?.name ?? '')
+  return objs.find((o: any) => String(o?.name ?? '') === name) || null
+}
+
+/** 层内目标身份序列（顺序变化也须能识别 ⇒ 该层整层标脏以采纳重排） */
+function dimIdentitySeq(objs: any[]): string {
+  return (objs || []).map((o: any) => String(objIdOf(o) ?? `name:${o?.name ?? ''}`)).join('|')
+}
+
+function dimsIndex(dims: any[]): Record<string, any[]> {
+  const out: Record<string, any[]> = {}
+  for (const d of dims || []) out[d.key] = d.objectives || []
+  return out
+}
+
+/**
+ * 本地脏 objective 明细（服务端只采纳这些条目，其余节点保留服务端现值）：
+ *   内容与载入基线不同 ⇒ 增/改；载入基线有而当前没有 ⇒ 删（value=null）；有行 id 但服务端基线无 ⇒ 本地新增（base=null）。
+ *   仅顺序变化（内容不变）⇒ 该层全部条目入明细（base=服务端原文，服务端据提交顺序采纳重排）。
+ */
+function buildDirtyObjectives(): any[] {
+  const out: any[] = []
+  const loaded = dimsIndex(loadedDims)
+  const serverRaw = dimsIndex(baseServerDims)
+  for (const dim of dimensions) {
+    const dk = dim.key
+    const cur: any[] = dim.objectives || []
+    const baseLoaded: any[] = loaded[dk] || []
+    const baseSrv: any[] = serverRaw[dk] || []
+    // 重排判据只看「增删之外仍然两边都在」的目标子序列：单纯新增/删除不算重排
+    // （否则删一个目标会把同层其余目标一并标脏 ⇒ 他方对这些目标的并发改会误报 409）
+    const sharedLocal = cur.filter((o: any) => findObjective(baseLoaded, o))
+    const sharedLoaded = baseLoaded.filter((l: any) => findObjective(cur, l))
+    const reordered = dimIdentitySeq(sharedLocal) !== dimIdentitySeq(sharedLoaded)
+    for (const obj of cur) {
+      const seen = findObjective(baseLoaded, obj)
+      const changed = !seen || canonJson(obj) !== canonJson(seen)
+      if (!changed && !reordered) continue
+      const srv = findObjective(baseSrv, obj)
+      out.push({
+        dim_key: dk,
+        objective_id: objIdOf(obj),
+        name: obj?.name ?? '',
+        base: srv ? deepClone(srv) : null,      // null ⇒ 本地新增（服务端不应已有同 id 节点）
+        value: deepClone(obj),
+      })
+    }
+    for (const l of baseLoaded) {
+      if (findObjective(cur, l)) continue
+      const srv = findObjective(baseSrv, l)
+      out.push({
+        dim_key: dk, objective_id: objIdOf(l), name: l?.name ?? '',
+        base: srv ? deepClone(srv) : null, value: null,
+      })
+    }
+  }
+  return out
+}
+
+/** 连线是否本地改动（未改 ⇒ 不提交 canvas_data，避免整段覆写他方连线） */
+function connectionsDirty(): boolean {
+  const norm = (v: any) => canonJson({ connections: Array.isArray(v) ? v : [] })
+  return norm(connections.value) !== norm(loadedCanvas)
+}
+
+/** 采纳服务端回写的行 id（本地新增节点落库后由服务端分配 ⇒ 下次编辑仍按 id 定位） */
+function adoptServerIds(serverDims: any[]) {
+  if (!Array.isArray(serverDims)) return
+  const byKey = dimsIndex(serverDims)
+  for (const dim of dimensions) {
+    const list: any[] = byKey[dim.key] || []
+    for (const obj of dim.objectives || []) {
+      const hit = objIdOf(obj) !== null
+        ? list.find((o: any) => objIdOf(o) === objIdOf(obj))
+        : findObjective(list, obj)
+      if (!hit) continue
+      if (objIdOf(hit) !== null) obj._objective_id = objIdOf(hit)
+      if (hit._kr_id) obj._kr_id = hit._kr_id
+    }
+  }
+}
+
+/** 保存成功后刷新基线：脏判据回到本地现值；并发基准回到服务端现值（响应体 dimensions 为权威口径） */
+function refreshBaselines(serverDims: any[]) {
+  adoptServerIds(serverDims)
+  loadedDims = deepClone(dimensions)
+  loadedCanvas = deepClone(connections.value)
+  baseServerDims = deepClone(Array.isArray(serverDims) && serverDims.length ? serverDims : dimensions)
+}
+
 // ── 保存 ──
 let saveTimer: ReturnType<typeof setTimeout> | null = null
 let autoSaveTimer: ReturnType<typeof setInterval> | null = null
@@ -1109,21 +1251,29 @@ async function saveCanvas(silent?: boolean) {
     objectives: d.objectives,
   }))
   try {
-    const res: any = await mapApi.update(selectedMap.value, {
+    // 只提交本地脏的 objective（服务端按 objective 粒度合并，他方未冲突改动一律保留）；
+    // 连线未改动则不提交 canvas_data（避免整段覆写他方连线）
+    const payload: any = {
       dimensions: mapData,
-      canvas_data: { connections: connections.value },
+      dirty_objectives: buildDirtyObjectives(),
       version: currentMap.value?.version,
-      base_updated_at: currentBaseStamp(),   // 并发基准：过期则由服务端 409 拒绝覆写
-    })
+      base_updated_at: currentBaseStamp(),   // 并发基准（缺 ⇒ 服务端 fail-closed 409）
+    }
+    if (connectionsDirty()) payload.canvas_data = { connections: connections.value }
+    const res: any = await mapApi.update(selectedMap.value, payload)
     if (res?.updated_at) baseUpdatedAt.value = res.updated_at   // 采纳服务端新基准
+    refreshBaselines(res?.dimensions)                           // 基线回到服务端现值（响应体为权威）
     markClean()
     if (!silent) ElMessage.success("已保存")
   } catch (e: any) {
     if (e?.response?.status === 409) {
-      // 服务端已被他人修改：停止自动保存且不重试覆写（防过期快照整表覆写）
+      // 服务端已被他人修改（同一 objective 并发改 / 整段覆写冲突）：停止自动保存且不重试覆写
       autoSaveBlocked.value = true
       stopAutoSave()
-      ElMessage.warning("地图已被他人修改，自动保存已停止，请刷新页面后重试")
+      const detail = e?.response?.data?.detail
+      ElMessage.warning(detail
+        ? `地图已被他人修改，自动保存已停止，请刷新页面后重试（${detail}）`
+        : "地图已被他人修改，自动保存已停止，请刷新页面后重试")
     } else {
       console.error("saveCanvas error:", e)
     }