diff --git a/jituan/services/club_user.py b/jituan/services/club_user.py
index 9c2ffcd..34db884 100644
--- a/jituan/services/club_user.py
+++ b/jituan/services/club_user.py
@@ -1,5 +1,5 @@
 """用户所属俱乐部解析。"""
-from django.db import IntegrityError
+from django.db import IntegrityError, transaction
 
 from jituan.constants import CLUB_ID_DEFAULT
 from jituan.models import UserWxOpenid
@@ -41,27 +41,52 @@ def resolve_invite_party_club(user, request_club_id=None):
     return None
 
 
-def find_user_by_wx_openid(club_id, openid):
-    """按俱乐部 openid 绑定或 legacy OpenID/UserName 定位用户。"""
+def _user_querysets():
+    """兼容 gvsdsdk User.query 与 Django User.objects。"""
     from users.business_models import User
 
-    if club_id and openid:
+    seen = set()
+    for qs in (getattr(User, 'objects', None), getattr(User, 'query', None)):
+        if qs is None or id(qs) in seen:
+            continue
+        seen.add(id(qs))
+        yield qs
+
+
+def find_user_by_wx_openid(club_id, openid):
+    """按俱乐部 openid 绑定或 legacy UserName/OpenID 定位用户。"""
+    from users.business_models import User
+
+    openid = (openid or '').strip()
+    if not openid:
+        return None
+
+    if club_id:
         binding = UserWxOpenid.query.filter(club_id=club_id, openid=openid).first()
         if binding:
-            user = User.query.filter(UserUID=binding.yonghuid).first()
+            user = User.objects.filter(UserUID=binding.yonghuid).first()
             if not user:
-                user = User.objects.filter(UserUID=binding.yonghuid).first()
+                user = User.query.filter(UserUID=binding.yonghuid).first()
             if user:
                 return user
 
-    user = User.query.filter(OpenID=openid).first()
-    if not user:
-        user = User.objects.filter(OpenID=openid).first()
-    if not user:
-        user = User.query.filter(UserName=openid).first()
-    if not user:
-        user = User.objects.filter(UserName=openid).first()
-    return user
+    binding_any = UserWxOpenid.query.filter(openid=openid).order_by('id').first()
+    if binding_any:
+        user = User.objects.filter(UserUID=binding_any.yonghuid).first()
+        if not user:
+            user = User.query.filter(UserUID=binding_any.yonghuid).first()
+        if user:
+            return user
+
+    # 星之界等用户常 UserName=openid 且 OpenID 为空，优先按 UserName 查
+    for manager in _user_querysets():
+        user = manager.filter(UserName=openid).first()
+        if user:
+            return user
+        user = manager.filter(OpenID=openid).first()
+        if user:
+            return user
+    return None
 
 
 def ensure_wx_openid_binding(club_id, openid, user, unionid=''):
@@ -95,23 +120,29 @@ def resolve_or_create_wx_user(club_id, openid, generate_uid, unionid=''):
     import uuid
     from users.business_models import User
 
+    openid = (openid or '').strip()
+    if not openid:
+        raise ValueError('openid 不能为空')
+
     user = find_user_by_wx_openid(club_id, openid)
     if user:
         ensure_wx_openid_binding(club_id, openid, user, unionid)
         return user, False
 
     try:
-        user = User(
-            UserUUID=uuid.uuid4().bytes,
-            UserUID=generate_uid(),
-            UserName=openid,
-            OpenID=openid if club_id == CLUB_ID_DEFAULT else None,
-            UnionID=unionid or None,
-            ClubID='',
-        )
-        user.save()
-        ensure_wx_openid_binding(club_id, openid, user, unionid)
-        return user, True
+        # 嵌套 savepoint：并发注册撞唯一键时只回滚创建，不污染外层 atomic
+        with transaction.atomic():
+            user = User(
+                UserUUID=uuid.uuid4().bytes,
+                UserUID=generate_uid(),
+                UserName=openid,
+                OpenID=openid if club_id == CLUB_ID_DEFAULT else None,
+                UnionID=unionid or None,
+                ClubID='',
+            )
+            user.save()
+            ensure_wx_openid_binding(club_id, openid, user, unionid)
+            return user, True
     except IntegrityError:
         user = find_user_by_wx_openid(club_id, openid)
         if not user: