diff --git a/backend/app/database.py b/backend/app/database.py
index ae18562..73d151d 100644
--- a/backend/app/database.py
+++ b/backend/app/database.py
@@ -150,6 +150,10 @@ def _migrate_upstream_generated_keys():
             conn.execute(text("UPDATE upstream_generated_keys SET updated_at = created_at WHERE updated_at IS NULL"))
         if "managed_prefix" not in columns:
             conn.execute(text("ALTER TABLE upstream_generated_keys ADD COLUMN managed_prefix VARCHAR(64)"))
+        if "imported_target_group_id" not in columns:
+            conn.execute(text("ALTER TABLE upstream_generated_keys ADD COLUMN imported_target_group_id VARCHAR(255)"))
+        if "imported_target_group_name" not in columns:
+            conn.execute(text("ALTER TABLE upstream_generated_keys ADD COLUMN imported_target_group_name VARCHAR(255)"))
 
     # ——— 历史数据迁移：回填 managed_prefix + 清理重复 ———
     with engine.begin() as conn:
diff --git a/backend/app/models/upstream_key.py b/backend/app/models/upstream_key.py
index 2d414a2..6e47cb9 100644
--- a/backend/app/models/upstream_key.py
+++ b/backend/app/models/upstream_key.py
@@ -25,6 +25,8 @@ class UpstreamGeneratedKey(Base):
     imported_website_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("websites.id", ondelete="SET NULL"), nullable=True, index=True)
     imported_account_id: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
     imported_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
+    imported_target_group_id: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    imported_target_group_name: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc))
     updated_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
 
diff --git a/backend/app/routers/websites.py b/backend/app/routers/websites.py
index f186fe6..de5234e 100644
--- a/backend/app/routers/websites.py
+++ b/backend/app/routers/websites.py
@@ -558,16 +558,6 @@ def import_upstream_keys_as_accounts(
                 old_account_id = row.imported_account_id
                 exists = c.account_exists(row.imported_account_id)
                 if exists is True:
-                    # 自动更新已有账号的 priority（分步导入时全局倍率排序可能已变）
-                    new_priority = rate_priority_map.get(f"{row.upstream_id}:{row.group_id}") if body.auto_priority_by_rate else None
-                    priority_msg = "已导入过，已跳过"
-                    if new_priority is not None:
-                        try:
-                            c.update_account(old_account_id, {"priority": new_priority})
-                            priority_msg = f"已导入过，优先级已更新为 {new_priority}"
-                        except Exception as exc:
-                            logger.warning("update priority failed account=%s: %s", old_account_id, exc)
-                            priority_msg = f"已导入过，优先级更新失败: {exc}"
                     items.append(ImportAccountItem(
                         upstream_key_id=row.id,
                         source_group_id=row.group_id,
@@ -578,7 +568,7 @@ def import_upstream_keys_as_accounts(
                         platform=platform,
                         upstream_base_url=upstream_base_url,
                         status="exists",
-                        message=priority_msg,
+                        message="已导入过，已跳过",
                     ))
                     continue
                 elif exists is False:
@@ -639,6 +629,8 @@ def import_upstream_keys_as_accounts(
                 row.imported_website_id = wid
                 row.imported_account_id = account_id or None
                 row.imported_at = datetime.now(timezone.utc)
+                row.imported_target_group_id = target_group_id or None
+                row.imported_target_group_name = None  # target_group_map 只存 ID，name 展示用可留 NULL
                 row.status = "imported"
                 row.error = None
                 db.commit()
diff --git a/backend/app/services/website_sync.py b/backend/app/services/website_sync.py
index b066610..a02320f 100644
--- a/backend/app/services/website_sync.py
+++ b/backend/app/services/website_sync.py
@@ -288,12 +288,13 @@ def _try_send_priority_webhook(
 def sync_account_priorities_for_upstream(db: Session, upstream_id: int) -> list[dict]:
     """上游倍率变化后，自动更新已导入下游账号的 priority。
 
-    查询该上游下所有已导入（非 orphaned）的 Key，按目标网站分组后重新计算全局优先级，
-    并通过 update_account API 推送到下游网站。返回详细结果列表。
-
-    同时写入 WebsiteSyncLog 持久化审计日志，并通过 webhook 发送通知。
+    只处理同一目标分组内有多个账号（存在竞争）的情况：
+    - 竞争分组键：imported_target_group_id（老数据 fallback 到 group_id）
+    - 同一竞争分组内按倍率升序排序，priority 从 1 开始（相同倍率共享）
+    - 单账号分组：完全跳过，不调用 update_account，不发通知
+    - 无竞争分组：直接返回，不写日志，不发通知
     """
-    from app.services.website_client import Sub2ApiWebsiteClient as Client
+    from collections import defaultdict
 
     key_rows = (
         db.query(UpstreamGeneratedKey)
@@ -314,9 +315,7 @@ def sync_account_priorities_for_upstream(db: Session, upstream_id: int) -> list[
     website_groups: dict[int, list[UpstreamGeneratedKey]] = {}
     for row in key_rows:
         wid = row.imported_website_id
-        if wid not in website_groups:
-            website_groups[wid] = []
-        website_groups[wid].append(row)
+        website_groups.setdefault(wid, []).append(row)
 
     all_results: list[dict] = []
 
@@ -324,16 +323,10 @@ def sync_account_priorities_for_upstream(db: Session, upstream_id: int) -> list[
         website = db.query(Website).filter(Website.id == wid).first()
         if not website or not website.enabled:
             logger.info("skip account priority sync: website %s not found or disabled", wid)
-            site_results = []
-            for row in rows:
-                r = _priority_result(row, None, "failed", "网站不可用")
-                site_results.append(r)
-                all_results.append(r)
-            _write_priority_sync_log_with_map(db, wid, upstream_name, site_results, {})
-            _try_send_priority_webhook(db, wid, "", upstream_id, upstream_name, site_results)
+            # 不写日志、不发通知：网站不可用时账号无法更新，沉默跳过
             continue
 
-        # 查询该网站所有已导入 Key（跨上游），实现全局优先级排序
+        # 查询该网站所有已导入 Key（跨上游），用于倍率查询
         all_website_keys = (
             db.query(UpstreamGeneratedKey)
             .filter(
@@ -343,81 +336,114 @@ def sync_account_priorities_for_upstream(db: Session, upstream_id: int) -> list[
             )
             .all()
         )
+
+        # ── 按竞争分组分桶 ──────────────────────────────────────────────────
+        # 竞争分组键：imported_target_group_id（老数据为 NULL 时 fallback 到 group_id）
+        buckets: dict[str, list[UpstreamGeneratedKey]] = defaultdict(list)
+        for row in all_website_keys:
+            comp_key = row.imported_target_group_id or row.group_id
+            buckets[comp_key].append(row)
+
+        # 只保留账号数 > 1 的分组（有竞争才需要排序）
+        competitive_buckets = {k: v for k, v in buckets.items() if len(v) > 1}
+
+        if not competitive_buckets:
+            logger.info(
+                "skip account priority sync for website %s: no competitive groups (all single-account)",
+                wid,
+            )
+            continue  # 不写日志，不发通知
+
+        # ── 预取快照倍率 ────────────────────────────────────────────────────
         all_upstream_ids = {k.upstream_id for k in all_website_keys}
         try:
-            priority_map = build_rate_priority_map(db, all_upstream_ids)
+            # 构建 "{upstream_id}:{group_id}" → rate 查询表
+            raw_rate_map: dict[str, float] = {}
+            for uid in all_upstream_ids:
+                groups = latest_rate_map(db, uid)
+                for gid, g in groups.items():
+                    if isinstance(g, dict):
+                        raw_rate_map[f"{uid}:{gid}"] = _snapshot_group_rate(g)
         except Exception as exc:
-            logger.warning("build_rate_priority_map failed for website %s: %s", wid, exc)
-            site_results = []
-            for row in all_website_keys:
-                r = _priority_result(row, None, "failed", f"构建优先级映射失败: {exc}")
-                site_results.append(r)
-                all_results.append(r)
-            _write_priority_sync_log_with_map(db, wid, upstream_name, site_results, {})
-            _try_send_priority_webhook(db, wid, "", upstream_id, upstream_name, site_results)
-            continue
+            logger.warning("build rate map failed for website %s: %s", wid, exc)
+            raw_rate_map = {}
 
-        if not priority_map:
-            logger.info("skip account priority sync for website %s: empty priority map", wid)
-            site_results = []
-            for row in all_website_keys:
-                r = _priority_result(row, None, "skipped", "无上游倍率数据")
-                site_results.append(r)
-                all_results.append(r)
-            _write_priority_sync_log_with_map(db, wid, upstream_name, site_results, {})
-            _try_send_priority_webhook(db, wid, "", upstream_id, upstream_name, site_results)
-            continue
+        # ── 每个竞争分组内独立计算 priority ────────────────────────────────
+        # priority_assignment: account_id → new_priority
+        priority_assignment: dict[str, int] = {}
+        for comp_key, comp_rows in competitive_buckets.items():
+            # 取每行的倍率（查不到则 fallback 1.0）
+            rated = [
+                (row, raw_rate_map.get(f"{row.upstream_id}:{row.group_id}", 1.0))
+                for row in comp_rows
+            ]
+            # 组内按倍率升序排序（倍率低 → priority 小 → 优先）
+            unique_rates = sorted(set(r for _, r in rated))
+            rate_to_prio = {rate: idx + 1 for idx, rate in enumerate(unique_rates)}
+            for row, rate in rated:
+                priority_assignment[row.imported_account_id] = rate_to_prio[rate]
 
+        # ── 调用 update_account（仅竞争分组的账号）───────────────────────
         site_results: list[dict] = []
         try:
-            with Client(
+            with Sub2ApiWebsiteClient(
                 base_url=website.base_url,
                 api_prefix=website.api_prefix,
                 auth_type=website.auth_type,
                 auth_config=json.loads(website.auth_config_json or "{}"),
                 timeout=float(website.timeout_seconds),
             ) as client:
-                for row in all_website_keys:
-                    account_id = row.imported_account_id
-                    if not account_id:
-                        continue
-                    new_priority = priority_map.get(f"{row.upstream_id}:{row.group_id}")
-                    if new_priority is None:
-                        site_results.append(
-                            _priority_result(row, None, "skipped", "无倍率数据，跳过")
-                        )
-                        continue
-                    try:
-                        client.update_account(account_id, {"priority": new_priority})
-                        logger.info(
-                            "updated priority for account %s (website=%s, upstream=%s, group=%s): %s",
-                            account_id, wid, row.upstream_id, row.group_id, new_priority,
-                        )
-                        site_results.append(
-                            _priority_result(row, new_priority, "success", f"优先级已更新为 {new_priority}")
-                        )
-                    except Exception as exc:
-                        logger.warning(
-                            "failed to update priority for account %s (website=%s): %s",
-                            account_id, wid, exc,
-                        )
-                        site_results.append(
-                            _priority_result(row, new_priority, "failed", str(exc))
-                        )
+                for comp_rows in competitive_buckets.values():
+                    for row in comp_rows:
+                        account_id = row.imported_account_id
+                        new_priority = priority_assignment.get(account_id)
+                        if new_priority is None:
+                            continue
+                        try:
+                            client.update_account(account_id, {"priority": new_priority})
+                            logger.info(
+                                "updated priority for account %s (website=%s, upstream=%s, group=%s"
+                                ", comp_group=%s): %s",
+                                account_id, wid, row.upstream_id, row.group_id,
+                                row.imported_target_group_id or row.group_id, new_priority,
+                            )
+                            site_results.append(
+                                _priority_result(row, new_priority, "success", f"优先级已更新为 {new_priority}")
+                            )
+                        except Exception as exc:
+                            logger.warning(
+                                "failed to update priority for account %s (website=%s): %s",
+                                account_id, wid, exc,
+                            )
+                            site_results.append(
+                                _priority_result(row, new_priority, "failed", str(exc))
+                            )
         except Exception as exc:
             logger.warning("failed to connect website %s for account priority sync: %s", wid, exc)
-            for row in all_website_keys:
-                site_results.append(
-                    _priority_result(row, None, "failed", f"连接网站失败: {exc}")
-                )
+            for comp_rows in competitive_buckets.values():
+                for row in comp_rows:
+                    site_results.append(
+                        _priority_result(row, None, "failed", f"连接网站失败: {exc}")
+                    )
+
+        # 只发送有实际成功/失败的通知（不包含单账号跳过项）
+        notify_updates = [r for r in site_results if r["status"] in ("success", "failed")]
+        if notify_updates:
+            # 构建简化的 priority_map 供日志参考（只包含竞争分组的账号）
+            priority_map_snapshot = {
+                f"{row.upstream_id}:{row.group_id}": priority_assignment.get(row.imported_account_id)
+                for comp_rows in competitive_buckets.values()
+                for row in comp_rows
+            }
+            _write_priority_sync_log_with_map(db, wid, upstream_name, site_results, priority_map_snapshot)
+            _try_send_priority_webhook(db, wid, website.name, upstream_id, upstream_name, notify_updates)
 
         all_results.extend(site_results)
-        _write_priority_sync_log_with_map(db, wid, upstream_name, site_results, priority_map)
-        _try_send_priority_webhook(db, wid, website.name, upstream_id, upstream_name, site_results)
 
     return all_results
 
 
+
 def _fetch_remote_managed_prefixes(db: Session, upstream_id: int) -> list[str]:
     """查询本地 distinct managed_prefix。
 
diff --git a/backend/test_priority_sync.py b/backend/test_priority_sync.py
index 833a573..931133f 100644
--- a/backend/test_priority_sync.py
+++ b/backend/test_priority_sync.py
@@ -1,3 +1,14 @@
+"""
+优先级同步测试套件 — 分组内竞争逻辑
+
+核心规则（测试覆盖）：
+- 竞争分组键 = imported_target_group_id or group_id（老数据 fallback）
+- 只有同一竞争分组内账号数 > 1 时才更新 priority / 发通知
+- 不同分组各 1 个账号：不调用 update_account，不发通知
+- 同一目标分组多账号：组内按倍率升序独立排序，priority 从 1 开始
+- 两个目标分组各有多账号：彼此独立，每组内 priority 都从 1 开始
+- 老数据 imported_target_group_id=NULL：fallback group_id，不报错
+"""
 import json
 from datetime import datetime, timezone
 import pytest
@@ -12,10 +23,11 @@ from app.models.upstream_key import UpstreamGeneratedKey
 from app.models.snapshot import UpstreamRateSnapshot
 from app.services.website_sync import (
     build_rate_priority_map,
-    sync_account_priorities_for_upstream
+    sync_account_priorities_for_upstream,
 )
 from app.services.website_client import Sub2ApiWebsiteClient
 
+
 @pytest.fixture()
 def db_session():
     engine = create_engine(
@@ -32,28 +44,293 @@ def db_session():
         db.close()
         Base.metadata.drop_all(bind=engine)
 
+
+# ── 辅助 ─────────────────────────────────────────────────────────────────────
+
+def _make_snapshot(db, upstream_id: int, groups: dict):
+    """插入快照 groups = {group_id: rate}。"""
+    snap = {
+        "groups": {
+            gid: {"group_name": gid, "rate": rate}
+            for gid, rate in groups.items()
+        }
+    }
+    db.add(UpstreamRateSnapshot(
+        upstream_id=upstream_id,
+        snapshot_json=json.dumps(snap),
+        captured_at=datetime.now(timezone.utc),
+    ))
+    db.commit()
+
+
+def _make_key(db, upstream_id, group_id, key_name, key_value,
+              website_id, account_id, imported_target_group_id=None):
+    k = UpstreamGeneratedKey(
+        upstream_id=upstream_id,
+        group_id=group_id,
+        group_name=group_id,
+        key_name=key_name,
+        key_value=key_value,
+        imported_website_id=website_id,
+        imported_account_id=account_id,
+        imported_target_group_id=imported_target_group_id,
+    )
+    db.add(k)
+    db.commit()
+    return k
+
+
+class MockClient:
+    """可注入的 update_account 记录器。"""
+    _calls: list  # 由子类/工厂绑定
+
+    def __init__(self, **kwargs):
+        pass  # calls 由工厂方法注入
+
+    def __enter__(self): return self
+    def __exit__(self, *a): pass
+
+    def update_account(self, account_id, data):
+        type(self)._shared_calls.append((account_id, data))
+
+
+def make_mock_client(calls: list):
+    """返回一个与 calls 列表绑定的 MockClient 类。"""
+    class _Client(MockClient):
+        _shared_calls = calls
+    return _Client
+
+
+# ── 用例 ─────────────────────────────────────────────────────────────────────
+
+def test_no_update_when_different_groups_single_account_each(db_session, monkeypatch):
+    """不同分组各 1 个账号 → 无竞争 → 不调用 update_account，不发通知。"""
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    u2 = Upstream(name="U2", base_url="http://u2")
+    db_session.add_all([w, u1, u2])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1); db_session.refresh(u2)
+
+    _make_snapshot(db_session, u1.id, {"G1": 1.0})
+    _make_snapshot(db_session, u2.id, {"G2": 2.0})
+
+    # 不同分组，各 1 个账号，imported_target_group_id=None (fallback group_id)
+    _make_key(db_session, u1.id, "G1", "K1", "V1", w.id, "A1")
+    _make_key(db_session, u2.id, "G2", "K2", "V2", w.id, "A2")
+
+    update_calls = []
+    monkeypatch.setattr(
+        "app.services.website_sync.Sub2ApiWebsiteClient",
+        make_mock_client(update_calls),
+    )
+
+    results = sync_account_priorities_for_upstream(db_session, u1.id)
+
+    # 无竞争分组 → 直接返回空列表，不调用 update_account
+    assert update_calls == [], f"不应有更新调用，实际：{update_calls}"
+    assert results == []
+
+    # 不写日志
+    logs = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).all()
+    assert logs == []
+
+
+def test_same_target_group_two_accounts_updated(db_session, monkeypatch):
+    """同一目标分组 2 个账号 → 有竞争 → 按倍率更新 priority。"""
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    u2 = Upstream(name="U2", base_url="http://u2")
+    db_session.add_all([w, u1, u2])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1); db_session.refresh(u2)
+
+    _make_snapshot(db_session, u1.id, {"G1": 1.0})
+    _make_snapshot(db_session, u2.id, {"G2": 2.0})
+
+    # 两个账号都属于目标分组 "TG1"
+    _make_key(db_session, u1.id, "G1", "K1", "V1", w.id, "A1", imported_target_group_id="TG1")
+    _make_key(db_session, u2.id, "G2", "K2", "V2", w.id, "A2", imported_target_group_id="TG1")
+
+    update_calls = []
+    monkeypatch.setattr(
+        "app.services.website_sync.Sub2ApiWebsiteClient",
+        make_mock_client(update_calls),
+    )
+
+    results = sync_account_priorities_for_upstream(db_session, u1.id)
+
+    assert len(update_calls) == 2
+    priority_map = {aid: data["priority"] for aid, data in update_calls}
+    # G1 rate=1.0 → priority=1（低倍率优先）；G2 rate=2.0 → priority=2
+    assert priority_map["A1"] == 1
+    assert priority_map["A2"] == 2
+
+    # 写了日志
+    log = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).first()
+    assert log is not None
+    assert log.algorithm == "priority_sync"
+
+
+def test_two_target_groups_independent_priority(db_session, monkeypatch):
+    """两个目标分组各有多账号 → 每组内独立从 1 开始排序，不互相影响。"""
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    db_session.add_all([w, u1])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1)
+
+    _make_snapshot(db_session, u1.id, {
+        "G1": 1.0,   # → TG1 中排 priority=1
+        "G2": 2.0,   # → TG1 中排 priority=2
+        "G3": 0.5,   # → TG2 中排 priority=1
+        "G4": 3.0,   # → TG2 中排 priority=2
+    })
+
+    # TG1: G1(1.0), G2(2.0)
+    _make_key(db_session, u1.id, "G1", "K1", "V1", w.id, "A1", imported_target_group_id="TG1")
+    _make_key(db_session, u1.id, "G2", "K2", "V2", w.id, "A2", imported_target_group_id="TG1")
+    # TG2: G3(0.5), G4(3.0)
+    _make_key(db_session, u1.id, "G3", "K3", "V3", w.id, "A3", imported_target_group_id="TG2")
+    _make_key(db_session, u1.id, "G4", "K4", "V4", w.id, "A4", imported_target_group_id="TG2")
+
+    update_calls = []
+    monkeypatch.setattr(
+        "app.services.website_sync.Sub2ApiWebsiteClient",
+        make_mock_client(update_calls),
+    )
+
+    sync_account_priorities_for_upstream(db_session, u1.id)
+
+    priority_map = {aid: data["priority"] for aid, data in update_calls}
+    assert len(update_calls) == 4
+
+    # TG1 内部：G1(1.0)→p1, G2(2.0)→p2
+    assert priority_map["A1"] == 1
+    assert priority_map["A2"] == 2
+    # TG2 内部：G3(0.5)→p1, G4(3.0)→p2（独立从 1 开始）
+    assert priority_map["A3"] == 1
+    assert priority_map["A4"] == 2
+
+
+def test_old_data_null_target_group_fallback(db_session, monkeypatch):
+    """老数据 imported_target_group_id=NULL → fallback group_id，不报错。
+
+    两个账号同 group_id（极端边界），视为同一竞争分组 → 有竞争 → 更新。
+    """
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    u2 = Upstream(name="U2", base_url="http://u2")
+    db_session.add_all([w, u1, u2])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1); db_session.refresh(u2)
+
+    _make_snapshot(db_session, u1.id, {"GSHARED": 1.0})
+    _make_snapshot(db_session, u2.id, {"GSHARED": 2.0})
+
+    # 老数据：imported_target_group_id=None，两账号 group_id 相同
+    _make_key(db_session, u1.id, "GSHARED", "K1", "V1", w.id, "A1", imported_target_group_id=None)
+    _make_key(db_session, u2.id, "GSHARED", "K2", "V2", w.id, "A2", imported_target_group_id=None)
+
+    update_calls = []
+    monkeypatch.setattr(
+        "app.services.website_sync.Sub2ApiWebsiteClient",
+        make_mock_client(update_calls),
+    )
+
+    # 不应抛异常
+    results = sync_account_priorities_for_upstream(db_session, u1.id)
+
+    # 同 group_id="GSHARED" → 竞争分组，两账号都更新
+    assert len(update_calls) == 2
+
+
+def test_single_account_in_mixed_website(db_session, monkeypatch):
+    """同一网站：一个目标分组有 2 账号（竞争），另一个目标分组只有 1 账号（不参与）。
+
+    只有竞争分组的 2 个账号被更新，单账号分组不调用 update_account。
+    """
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    db_session.add_all([w, u1])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1)
+
+    _make_snapshot(db_session, u1.id, {"G1": 1.0, "G2": 2.0, "G3": 3.0})
+
+    # TG1: G1 + G2 → 竞争
+    _make_key(db_session, u1.id, "G1", "K1", "V1", w.id, "A1", imported_target_group_id="TG1")
+    _make_key(db_session, u1.id, "G2", "K2", "V2", w.id, "A2", imported_target_group_id="TG1")
+    # TG2: 只有 G3 → 单账号，跳过
+    _make_key(db_session, u1.id, "G3", "K3", "V3", w.id, "A3", imported_target_group_id="TG2")
+
+    update_calls = []
+    monkeypatch.setattr(
+        "app.services.website_sync.Sub2ApiWebsiteClient",
+        make_mock_client(update_calls),
+    )
+
+    sync_account_priorities_for_upstream(db_session, u1.id)
+
+    updated_ids = {c[0] for c in update_calls}
+    assert "A3" not in updated_ids, "单账号分组不应被更新"
+    assert updated_ids == {"A1", "A2"}
+
+
+def test_priority_sync_log_structure(db_session, monkeypatch):
+    """日志写入格式验证（需要竞争分组才会写日志）。"""
+    w = Website(name="W1", base_url="http://w1", enabled=True,
+                auth_config_json="{}", timeout_seconds=30)
+    u1 = Upstream(name="U1", base_url="http://u1")
+    db_session.add_all([w, u1])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u1)
+
+    _make_snapshot(db_session, u1.id, {"G1": 1.0, "G2": 2.0})
+
+    # 同一目标分组 2 账号 → 有日志
+    _make_key(db_session, u1.id, "G1", "K1", "V1", w.id, "A1", imported_target_group_id="TG1")
+    _make_key(db_session, u1.id, "G2", "K2", "V2", w.id, "A2", imported_target_group_id="TG1")
+
+    class LoggingMockClient:
+        def __init__(self, **kwargs): pass
+        def __enter__(self): return self
+        def __exit__(self, *a): pass
+        def update_account(self, account_id, data): pass
+
+    monkeypatch.setattr("app.services.website_sync.Sub2ApiWebsiteClient", LoggingMockClient)
+
+    sync_account_priorities_for_upstream(db_session, u1.id)
+
+    log = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).first()
+    assert log is not None
+    assert log.algorithm == "priority_sync"
+
+    data = json.loads(log.source_rates_json)
+    # 第一项是 priority_map 元数据
+    assert data[0]["_meta"] == "priority_map"
+    # 后续项是账号结果
+    account_ids = {item["account_id"] for item in data[1:] if "account_id" in item}
+    assert {"A1", "A2"} == account_ids
+
+
+# ── 保留：build_rate_priority_map 单元测试（供初始导入使用）────────────────
+
 def test_priority_sync_cross_upstream_group(db_session):
-    # Setup 2 upstreams
+    """build_rate_priority_map：相同 group_id 不同上游不互相覆盖。"""
     u1 = Upstream(name="U1", base_url="http://u1")
     u2 = Upstream(name="U2", base_url="http://u2")
     db_session.add_all([u1, u2])
     db_session.commit()
-    db_session.refresh(u1)
-    db_session.refresh(u2)
+    db_session.refresh(u1); db_session.refresh(u2)
 
-    # Setup snapshots for both with same group ID "VIP" but different rates
-    s1 = UpstreamRateSnapshot(
-        upstream_id=u1.id,
-        snapshot_json=json.dumps({"groups": {"VIP": {"group_name": "VIP", "rate": 1.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    )
-    s2 = UpstreamRateSnapshot(
-        upstream_id=u2.id,
-        snapshot_json=json.dumps({"groups": {"VIP": {"group_name": "VIP", "rate": 2.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    )
-    db_session.add_all([s1, s2])
-    db_session.commit()
+    _make_snapshot(db_session, u1.id, {"VIP": 1.0})
+    _make_snapshot(db_session, u2.id, {"VIP": 2.0})
 
     priority_map = build_rate_priority_map(db_session, {u1.id, u2.id})
 
@@ -61,145 +338,44 @@ def test_priority_sync_cross_upstream_group(db_session):
     assert priority_map[f"{u2.id}:VIP"] == 2
     assert len(priority_map) == 2
 
-def test_priority_sync_full_website_update(db_session, monkeypatch):
-    # Setup website and upstreams
-    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}", timeout_seconds=30)
-    u1 = Upstream(name="U1", base_url="http://u1")
-    u2 = Upstream(name="U2", base_url="http://u2")
-    db_session.add_all([w, u1, u2])
-    db_session.commit()
-    db_session.refresh(w)
-    db_session.refresh(u1)
-    db_session.refresh(u2)
-
-    # Setup snapshots
-    db_session.add(UpstreamRateSnapshot(
-        upstream_id=u1.id,
-        snapshot_json=json.dumps({"groups": {"G1": {"rate": 1.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    ))
-    db_session.add(UpstreamRateSnapshot(
-        upstream_id=u2.id,
-        snapshot_json=json.dumps({"groups": {"G2": {"rate": 2.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    ))
-    db_session.commit()
-
-    # Setup keys imported to website
-    k1 = UpstreamGeneratedKey(upstream_id=u1.id, group_id="G1", key_name="K1", key_value="V1",
-                              imported_website_id=w.id, imported_account_id="A1")
-    k2 = UpstreamGeneratedKey(upstream_id=u2.id, group_id="G2", key_name="K2", key_value="V2",
-                              imported_website_id=w.id, imported_account_id="A2")
-    db_session.add_all([k1, k2])
-    db_session.commit()
-
-    # Mock Sub2ApiWebsiteClient
-    update_calls = []
-    class MockClient:
-        def __init__(self, **kwargs): pass
-        def __enter__(self): return self
-        def __exit__(self, *args): pass
-        def update_account(self, account_id, data):
-            update_calls.append((account_id, data))
-
-    monkeypatch.setattr("app.services.website_sync.Sub2ApiWebsiteClient", MockClient)
-    monkeypatch.setattr("app.services.website_client.Sub2ApiWebsiteClient", MockClient)
-
-    # Trigger sync for U1
-    sync_account_priorities_for_upstream(db_session, u1.id)
-
-    # Verify BOTH A1 and A2 were updated because they belong to the same website
-    assert len(update_calls) == 2
-    account_ids = {c[0] for c in update_calls}
-    assert account_ids == {"A1", "A2"}
-    
-    # Priority check: G1(1.0) -> 1, G2(2.0) -> 2
-    for aid, data in update_calls:
-        if aid == "A1": assert data["priority"] == 1
-        if aid == "A2": assert data["priority"] == 2
-
-def test_priority_sync_log_structure(db_session, monkeypatch):
-    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}", timeout_seconds=30)
-    u1 = Upstream(name="U1", base_url="http://u1")
-    db_session.add_all([w, u1])
-    db_session.commit()
-    db_session.refresh(w)
-    db_session.refresh(u1)
-
-    db_session.add(UpstreamRateSnapshot(
-        upstream_id=u1.id,
-        snapshot_json=json.dumps({"groups": {"G1": {"rate": 1.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    ))
-    db_session.add(UpstreamGeneratedKey(upstream_id=u1.id, group_id="G1", key_name="K1", key_value="V1",
-                              imported_website_id=w.id, imported_account_id="A1"))
-    db_session.commit()
-
-    class MockClient:
-        def __init__(self, **kwargs): pass
-        def __enter__(self): return self
-        def __exit__(self, *args): pass
-        def update_account(self, account_id, data): pass
-
-    monkeypatch.setattr("app.services.website_sync.Sub2ApiWebsiteClient", MockClient)
-    monkeypatch.setattr("app.services.website_client.Sub2ApiWebsiteClient", MockClient)
-
-    sync_account_priorities_for_upstream(db_session, u1.id)
-
-    log = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).first()
-    assert log is not None
-    assert log.algorithm == "priority_sync"
-    
-    data = json.loads(log.source_rates_json)
-    # The first item should be the priority map metadata
-    assert data[0]["_meta"] == "priority_map"
-    assert f"{u1.id}:G1" in data[0]["data"]
-    # The second item should be the account result
-    assert data[1]["account_id"] == "A1"
 
 def test_import_auto_priority_by_rate(db_session, monkeypatch):
+    """初始导入时 auto_priority_by_rate=True 按全局倍率分配 priority。"""
     from app.routers.websites import import_upstream_keys_as_accounts
     from app.schemas.website import ImportAccountsRequest
 
-    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}", 
+    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}",
                 groups_endpoint="/groups", group_update_endpoint="/groups/{id}", timeout_seconds=30)
     u1 = Upstream(name="U1", base_url="http://u1")
     u2 = Upstream(name="U2", base_url="http://u2")
     db_session.add_all([w, u1, u2])
     db_session.commit()
-    db_session.refresh(w)
-    db_session.refresh(u1)
-    db_session.refresh(u2)
+    db_session.refresh(w); db_session.refresh(u1); db_session.refresh(u2)
 
-    db_session.add(UpstreamRateSnapshot(
-        upstream_id=u1.id,
-        snapshot_json=json.dumps({"groups": {"G1": {"rate": 2.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    ))
-    db_session.add(UpstreamRateSnapshot(
-        upstream_id=u2.id,
-        snapshot_json=json.dumps({"groups": {"G2": {"rate": 1.0}}}),
-        captured_at=datetime.now(timezone.utc)
-    ))
+    _make_snapshot(db_session, u1.id, {"G1": 2.0})
+    _make_snapshot(db_session, u2.id, {"G2": 1.0})
 
-    k1 = UpstreamGeneratedKey(upstream_id=u1.id, group_id="G1", group_name="G1", key_name="K1", key_value="V1")
-    k2 = UpstreamGeneratedKey(upstream_id=u2.id, group_id="G2", group_name="G2", key_name="K2", key_value="V2")
+    k1 = UpstreamGeneratedKey(upstream_id=u1.id, group_id="G1", group_name="G1",
+                              key_name="K1", key_value="V1")
+    k2 = UpstreamGeneratedKey(upstream_id=u2.id, group_id="G2", group_name="G2",
+                              key_name="K2", key_value="V2")
     db_session.add_all([k1, k2])
     db_session.commit()
 
     created_accounts = []
-    class MockClient:
+
+    class MockImportClient:
         def __init__(self, **kwargs): pass
         def __enter__(self): return self
-        def __exit__(self, *args): pass
+        def __exit__(self, *a): pass
         def create_account(self, body):
             created_accounts.append(body)
             return {"id": f"remote-{len(created_accounts)}", "name": body["name"]}
         def extract_id(self, data): return data["id"]
         def account_exists(self, aid): return False
 
-    monkeypatch.setattr("app.routers.websites._client", lambda website: MockClient())
-    monkeypatch.setattr("app.services.website_client.Sub2ApiWebsiteClient", MockClient)
+    monkeypatch.setattr("app.routers.websites._client", lambda website: MockImportClient())
+    monkeypatch.setattr("app.services.website_client.Sub2ApiWebsiteClient", MockImportClient)
 
     req = ImportAccountsRequest(
         upstream_key_ids=[k1.id, k2.id],
@@ -207,14 +383,13 @@ def test_import_auto_priority_by_rate(db_session, monkeypatch):
         auto_priority_by_rate=True,
         priority=10,
         account_name_prefix="test",
-        default_platform="openai"
+        default_platform="openai",
     )
 
     import_upstream_keys_as_accounts(w.id, req, db_session)
 
     assert len(created_accounts) == 2
-    # G2 has rate 1.0 -> priority 1
-    # G1 has rate 2.0 -> priority 2
+    # G2 rate=1.0 → priority 1；G1 rate=2.0 → priority 2
     p1 = next(a["priority"] for a in created_accounts if "G1" in a["name"])
     p2 = next(a["priority"] for a in created_accounts if "G2" in a["name"])
     assert p2 == 1