diff --git a/extensions/sync_ehr_leaves_to_oa/job.py b/extensions/sync_ehr_leaves_to_oa/job.py
index 2339798..257d486 100644
--- a/extensions/sync_ehr_leaves_to_oa/job.py
+++ b/extensions/sync_ehr_leaves_to_oa/job.py
@@ -189,6 +189,7 @@ class SyncEhrLeavesToOaMonthJob(BaseJob):
         max_pages_per_day = int(params.get("max_pages_per_day") or 500)
         if max_pages_per_day <= 0:
             max_pages_per_day = 500
+        debug_trace = str(params.get("debug_trace") or "").strip().lower() in ("1", "true", "yes", "y", "on")
 
         approved_statuses_param = params.get("approved_statuses")
         if approved_statuses_param is None:
@@ -332,6 +333,15 @@ class SyncEhrLeavesToOaMonthJob(BaseJob):
                 # 姓名按工号+日期保留一个非空值（用于 OA 展示）
                 if staff_name and key not in name_map:
                     name_map[key] = staff_name
+                if debug_trace and len(agg) <= 20:
+                    logger.info(
+                        "EHR 请假汇总样本：staff_id=%s job_no=%s date=%s day_value=%s approve_status=%s",
+                        sid,
+                        job_no,
+                        leave_date,
+                        _decimal_to_str(day_value),
+                        approve_status,
+                    )
 
             existing_row_map_by_export: dict[tuple[str, str], dict[str, str]] = {}
             for row in rows:
@@ -357,6 +367,16 @@ class SyncEhrLeavesToOaMonthJob(BaseJob):
                 month_end.isoformat(),
                 len(existing_row_map_by_export),
             )
+            if debug_trace:
+                for (k_job, k_date), rv in list(existing_row_map_by_export.items())[:20]:
+                    logger.info(
+                        "OA export 索引样本：job_no=%s date=%s row_id=%s leave_days=%s name=%s",
+                        k_job,
+                        k_date,
+                        rv.get("id"),
+                        rv.get("leave_days"),
+                        rv.get("name"),
+                    )
 
             existing_row_map_by_sql = ehr.get_oa_rows_by_job_and_date(
                 table_name=_OA_SQLSERVER_TABLE,
@@ -471,6 +491,53 @@ class SyncEhrLeavesToOaMonthJob(BaseJob):
                     for k, v in fd.items():
                         if str(k) not in failed_data:
                             failed_data[str(k)] = str(v)
+                logger.info(
+                    "OA batch-update chunk done: index=%s size=%s success=%s failed=%s message=%s",
+                    i // batch_size + 1,
+                    len(chunk),
+                    chunk_success,
+                    chunk_failed,
+                    str(rj.get("message") or ""),
+                )
+                if debug_trace and isinstance(fd, dict) and fd:
+                    logger.warning(
+                        "OA batch-update failedData sample: chunk=%s sample=%s",
+                        i // batch_size + 1,
+                        list(fd.items())[:20],
+                    )
+
+            # 写入后复核：重新 export，核对本次 key 实际存在数量
+            verify_resp = seeyon.export_cap4_form_soap(
+                templateCode=oa_template_code,
+                senderLoginName=sender_login_name,
+                rightId=oa_right_id,
+            )
+            verify_raw = verify_resp.text or ""
+            verify_payload = json.loads(verify_raw) if verify_raw else {}
+            verify_form = ((verify_payload.get("data") or {}).get("data") or {}) if isinstance(verify_payload, dict) else {}
+            verify_rows = verify_form.get("data") or []
+            if not isinstance(verify_rows, list):
+                verify_rows = []
+            verify_key_set: set[tuple[str, str]] = set()
+            for row in verify_rows:
+                if not isinstance(row, dict):
+                    continue
+                _, field_map = _extract_oa_row_id_and_fields(row)
+                job_no = _cell_value(field_map.get(field_job_no))
+                leave_date = _cell_show_value(field_map.get(field_leave_date)) or _date_only(_cell_value(field_map.get(field_leave_date)))
+                if job_no and leave_date:
+                    verify_key_set.add((job_no, leave_date))
+            aggregated_keys = set(agg.keys())
+            matched_after_write = len(aggregated_keys & verify_key_set)
+            missing_after_write = sorted(list(aggregated_keys - verify_key_set))[:50]
+            logger.info(
+                "OA 写入后复核：aggregated_keys=%s matched_after_write=%s missing_after_write=%s",
+                len(aggregated_keys),
+                matched_after_write,
+                len(aggregated_keys - verify_key_set),
+            )
+            if debug_trace and missing_after_write:
+                logger.warning("OA 写入后缺失样本（job_no,date）=%s", missing_after_write[:20])
 
             logger.info(
                 "EHR 请假月度同步完成：month=%s~%s vacations=%s aggregated=%s to_update=%s to_insert=%s skipped_unchanged=%s success=%s failed=%s",
@@ -499,6 +566,9 @@ class SyncEhrLeavesToOaMonthJob(BaseJob):
                 "skipped_not_approved": skipped_not_approved,
                 "skipped_non_positive": skipped_non_positive,
                 "failed_data": dict(list(failed_data.items())[:100]),
+                "matched_after_write": matched_after_write,
+                "missing_after_write": len(aggregated_keys - verify_key_set),
+                "missing_after_write_sample": missing_after_write,
             }
         finally:
             ehr.close()