fix: keep one douyu cookie per account

web/backend/services/login_service.py

@@ -300,8 +300,17 @@ class LoginBatchRunner:
                     task.ck_checked_at = None
                     _append_task_info(task, acc)
             else:
+                seen_account_ids = set()
                 for aid in self.account_ids:
-                    acc = self.db.query(AccountModel).filter(AccountModel.id == aid).first()
+                    if aid in seen_account_ids:
+                        continue
+                    seen_account_ids.add(aid)
+                    acc = (
+                        self.db.query(AccountModel)
+                        .filter(AccountModel.id == aid)
+                        .with_for_update()
+                        .first()
+                    )
                     if not acc:
                         continue
                     # 权限检查：客服只能跑分配给自己的
@@ -310,24 +319,45 @@ class LoginBatchRunner:
                             self._push_log("warning", f"跳过无权账号: {acc.username}")
                             continue
 
-                    # 复用该账号最近一条失败任务记录，避免重复产生多条
-                    existing_task = (
+                    # 一个斗鱼账号只保留一条成功 CK：再次普通登录时更新最新成功记录。
+                    latest_success_task = (
                         self.db.query(LoginTask)
-                        .filter(LoginTask.account_id == aid, LoginTask.status.in_(["failed", "error"]))
-                        .order_by(LoginTask.id.desc())
+                        .filter(LoginTask.account_id == aid, LoginTask.status == "success")
+                        .order_by(LoginTask.finished_at.desc(), LoginTask.id.desc())
                         .first()
                     )
-                    if existing_task:
-                        existing_task.cookie = ""
-                        task = existing_task
-                    else:
-                        task = LoginTask(
-                            batch_id=batch_id,
-                            account_id=aid,
-                            status="pending",
-                            created_by=self.created_by,
+                    if latest_success_task:
+                        duplicate_success_tasks = (
+                            self.db.query(LoginTask)
+                            .filter(
+                                LoginTask.account_id == aid,
+                                LoginTask.status == "success",
+                                LoginTask.id != latest_success_task.id,
+                            )
+                            .all()
                         )
-                        self.db.add(task)
+                        for duplicate_task in duplicate_success_tasks:
+                            self.db.delete(duplicate_task)
+                        task = latest_success_task
+                    else:
+                        # 复用该账号最近一条失败任务记录，避免重复产生多条失败历史。
+                        existing_task = (
+                            self.db.query(LoginTask)
+                            .filter(LoginTask.account_id == aid, LoginTask.status.in_(["failed", "error"]))
+                            .order_by(LoginTask.id.desc())
+                            .first()
+                        )
+                        if existing_task:
+                            existing_task.cookie = ""
+                            task = existing_task
+                        else:
+                            task = LoginTask(
+                                batch_id=batch_id,
+                                account_id=aid,
+                                status="pending",
+                                created_by=self.created_by,
+                            )
+                            self.db.add(task)
 
                     _append_task_info(task, acc)