fix: 无本地同地区基准时自相关通过并记为零

backend/app/jobs.py

@@ -515,7 +515,7 @@ class Runner:
     async def check_correlations(self, job_id, alpha_ids):
         """Check fixed targets against same-region submitted caches, with per-target recovery.
 
-        Missing references are reported as incomplete coverage. Authentication,
+        An empty same-region reference set passes locally with correlation zero. Authentication,
         transient upstream errors and cancellation retain the task for retry.
         """
         await self.checkpoint(job_id, {"total": len(alpha_ids)})
@@ -564,7 +564,12 @@ class Runner:
                     result["reason"] = "平台未提供目标 Alpha 的地区"
                 elif not reference_ids:
                     result = calculate_correlation([], [])
-                    result["reason"] = "没有同地区已提交 Alpha 可供比较，请先同步已提交 Alpha"
+                    # A local policy default, not a measured Pearson coefficient.
+                    result.update(
+                        status="low",
+                        max_correlation=0.0,
+                        reason="没有同地区已提交 Alpha 可供比较，按本地规则视为通过，自相关值记为 0",
+                    )
                 else:
                     target = await self.correlation_pnl(job_id, alpha_id)
                     references = []