fix(HEL-461): 后台整组切换异常统一为 FAILED_PRECONDITION

管理后台补数在切换事务中断时不再抛出原始异常，
统一映射为 ApiError FAILED_PRECONDITION，并保留旧完整版本。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

xiaobai-datahub/datahub/admin_api.py

@@ -145,10 +145,18 @@ class AdminAPI:
                 result = self.pipeline.ingest_reference(day)
             elif dataset in OFFICIAL_DATASETS or dataset == STOCKS_DATASET:
                 # Manual same-day republish must rebuild the full A/B boundary.
-                result = self.pipeline.force_republish_boundary(dataset, day)
-                failures = self.pipeline.eod_failures(result)
-                if failures:
-                    raise ApiError("FAILED_PRECONDITION", "; ".join(failures))
+                # Gate failures and mid-switch exceptions both surface as
+                # FAILED_PRECONDITION so the admin API never leaks raw
+                # transaction errors to the client.
+                try:
+                    result = self.pipeline.force_republish_boundary(dataset, day)
+                    failures = self.pipeline.eod_failures(result)
+                    if failures:
+                        raise ApiError("FAILED_PRECONDITION", "; ".join(failures))
+                except ApiError:
+                    raise
+                except Exception as exc:
+                    raise ApiError("FAILED_PRECONDITION", str(exc)) from exc
             else:
                 raise ApiError("INVALID_ARGUMENT", f"unsupported backfill dataset: {dataset}")
         self.pipeline.audit(actor, "backfill", f"{dataset}:{day}", json.dumps({"ok": True}))