fix(tasks): 增加自动标题本地兜底

core/task_title.py

@@ -101,6 +101,10 @@ def generate_task_title(
             f"{type(e).__name__}: {e}",
             flush=True,
         )
+        # 标题是一次性闸：若模型瞬时失败后仍只消费 pending，任务会永久停在
+        # “新对话”。直接用首条消息的第一行作本地兜底，保证有效首发总能完成
+        # 命名；不保留 pending 给后续消息重试，避免拿第二条消息误命名整段对话。
+        title = clean_generated_title("", user_message)
 
     # 一次性消费 pending。WHERE pending=true 是与人工 PATCH name 的竞态闸：
     # 用户先改名时 PATCH 已清 false，此处 rowcount=0，不覆盖。

tests/test_task_title.py

@@ -2,8 +2,15 @@
 from __future__ import annotations
 
 import unittest
+from types import SimpleNamespace
+from unittest.mock import MagicMock, patch
+from uuid import uuid4
 
-from core.task_title import clean_generated_title, is_attachment_only_message
+from core.task_title import (
+    clean_generated_title,
+    generate_task_title,
+    is_attachment_only_message,
+)
 
 
 class TaskTitleTests(unittest.TestCase):
@@ -32,6 +39,46 @@ class TaskTitleTests(unittest.TestCase):
         ))
         self.assertFalse(is_attachment_only_message(""))
 
+    def test_model_failure_applies_local_fallback_title(self):
+        task_id = uuid4()
+        user_id = uuid4()
+        read_session = MagicMock()
+        read_session.execute.return_value.first.return_value = SimpleNamespace(
+            auto_title_pending=True,
+            auto_title_version=3,
+        )
+        write_session = MagicMock()
+        write_session.execute.return_value.rowcount = 1
+
+        read_ctx = MagicMock()
+        read_ctx.__enter__.return_value = read_session
+        write_ctx = MagicMock()
+        write_ctx.__enter__.return_value = write_session
+
+        with (
+            patch("core.task_title.session_scope", side_effect=[read_ctx, write_ctx]),
+            patch(
+                "core.task_title.load_config",
+                return_value={
+                    "default_model": "deepseek_v4.flash",
+                    "models_dir": "config/models",
+                },
+            ),
+            patch("core.task_title.ModelCapabilities.load", return_value=MagicMock()),
+            patch("core.task_title.LLM", side_effect=RuntimeError("provider unavailable")),
+        ):
+            title = generate_task_title(
+                task_id=task_id,
+                user_id=user_id,
+                user_message="分析手机端自动命名失败\n补充说明",
+                model_profile="deepseek_v4.flash",
+            )
+
+        self.assertEqual(title, "分析手机端自动命名失败")
+        values = write_session.execute.call_args.args[0].compile().params
+        self.assertEqual(values["name"], "分析手机端自动命名失败")
+        self.assertFalse(values["auto_title_pending"])
+
 
 if __name__ == "__main__":
     unittest.main()