rebuild(migration): validate local legacy cutover

next/backend/jobs/service.py

@@ -57,7 +57,7 @@ class JobService:
                     finished_at=finished,
                     duration_ms=_duration(started, finished),
                     error_code=type(exc).__name__,
-                    error_message=str(exc) or "任务执行失败",
+                    error_message=_exception_message(exc),
                 )
             raise
         finished = datetime.now(SHANGHAI)
@@ -120,3 +120,10 @@ class JobService:
 
 def _duration(started: datetime, finished: datetime) -> int:
     return max(0, round((finished - started).total_seconds() * 1000))
+
+
+def _exception_message(error: Exception) -> str:
+    message = getattr(error, "message", None)
+    if isinstance(message, str) and message.strip():
+        return message.strip()
+    return str(error).strip() or "任务执行失败"