diff --git a/src/main/java/com/techsor/datacenter/sender/dao/DashboardAlertDao.java b/src/main/java/com/techsor/datacenter/sender/dao/DashboardAlertDao.java
index f385adb..32cd108 100644
--- a/src/main/java/com/techsor/datacenter/sender/dao/DashboardAlertDao.java
+++ b/src/main/java/com/techsor/datacenter/sender/dao/DashboardAlertDao.java
@@ -74,58 +74,73 @@ public class DashboardAlertDao {
 				.filter(e -> e.getEntity() != null && e.getEntity().getCompanyId() != null)
 				.collect(Collectors.groupingBy(e -> e.getEntity().getCompanyId()));
 
-		grouped.forEach((companyId, subList) -> {
+		grouped.forEach((companyId, companyList) -> {
 			long topCompanyId = companyInfoDao.getTopCompanyId(String.valueOf(companyId));
 			String dsKey = "dataSourceForCompany_" + topCompanyId;
 			try {
 				DataSourceContextHolder.setCurrentDataSourceKey(dsKey);
 
-				// 批量执行 upsert
-				StringBuilder sql = new StringBuilder(
-						"INSERT INTO device_rawdata_realtime (" +
-								"device_id, building_id, status, dashboard_status, receive_ts, " +
-								"alert_title, alert_content, alert_cancel_title, alert_cancel_content, " +
-								"raw_data, upload_year, upload_month, upload_day) VALUES "
-				);
-				List<Object> params = new ArrayList<>();
-				for (int i = 0; i < subList.size(); i++) {
-					DynamodbEntity entity = subList.get(i).getEntity();
-
-					sql.append("(?,?,?,?,?,?,?,?,?,?,?,?,?)");
-					if (i < subList.size() - 1) {
-						sql.append(",");
+				// 再按 retainAlert 分组（关键）
+				Map<Integer, List<AlertEvent>> retainGroup =
+						companyList.stream()
+								.collect(Collectors.groupingBy(
+										e -> e.getEntity().getRetainAlert()
+								));
+
+				// 每个 retainAlert 执行一次 batch upsert
+				retainGroup.forEach((retainAlert, subList) -> {
+					if (subList.isEmpty()) {
+						return;
 					}
 
-					params.add(entity.getDeviceId());
-					params.add(entity.getDbBuildingId());
-					params.add(entity.getStatus());
-					params.add(entity.getStatus());
-					params.add(entity.getReceive_ts());
-					params.add(entity.getAlertTitle());
-					params.add(entity.getAlertContent());
-					params.add(entity.getAlertCancelTitle());
-					params.add(entity.getAlertCancelContent());
-					params.add(entity.getRawData());
-					params.add(Integer.parseInt(entity.getYearKey()));
-					params.add(Integer.parseInt(entity.getMonthKey()));
-					params.add(Integer.parseInt(entity.getDayKey()));
-					//给下面dashboard_status = IF(? = 1 里的?用
-					params.add(entity.getRetainAlert());
-				}
-				sql.append(" ON DUPLICATE KEY UPDATE ")
-						.append("building_id = VALUES(building_id), ")
-						.append("status = VALUES(status), ")
-						.append("receive_ts = VALUES(receive_ts), ")
-						.append("alert_title = VALUES(alert_title), ")
-						.append("alert_content = VALUES(alert_content), ")
-						.append("alert_cancel_title = VALUES(alert_cancel_title), ")
-						.append("alert_cancel_content = VALUES(alert_cancel_content), ")
-						.append("raw_data = VALUES(raw_data), ")
-						.append("upload_year = VALUES(upload_year), ")
-						.append("upload_month = VALUES(upload_month), ")
-						.append("upload_day = VALUES(upload_day), ")
-						.append("dashboard_status = IF(? = 1 AND VALUES(status) = 'alert_cancel' AND dashboard_status = 'alert', dashboard_status, VALUES(status))");
-				jdbcTemplate.update(sql.toString(), params.toArray());
+					// 批量执行 upsert
+					StringBuilder sql = new StringBuilder(
+							"INSERT INTO device_rawdata_realtime (" +
+									"device_id, building_id, status, dashboard_status, receive_ts, " +
+									"alert_title, alert_content, alert_cancel_title, alert_cancel_content, " +
+									"raw_data, upload_year, upload_month, upload_day) VALUES "
+					);
+					List<Object> params = new ArrayList<>();
+					for (int i = 0; i < subList.size(); i++) {
+						DynamodbEntity entity = subList.get(i).getEntity();
+
+						sql.append("(?,?,?,?,?,?,?,?,?,?,?,?,?)");
+						if (i < subList.size() - 1) {
+							sql.append(",");
+						}
+
+						params.add(entity.getDeviceId());
+						params.add(entity.getDbBuildingId());
+						params.add(entity.getStatus());
+						params.add(entity.getStatus());
+						params.add(entity.getReceive_ts());
+						params.add(entity.getAlertTitle());
+						params.add(entity.getAlertContent());
+						params.add(entity.getAlertCancelTitle());
+						params.add(entity.getAlertCancelContent());
+						params.add(entity.getRawData());
+						params.add(Integer.parseInt(entity.getYearKey()));
+						params.add(Integer.parseInt(entity.getMonthKey()));
+						params.add(Integer.parseInt(entity.getDayKey()));
+					}
+                    // ON DUPLICATE KEY UPDATE（retainAlert 只绑定一次）
+					sql.append(" ON DUPLICATE KEY UPDATE ")
+							.append("building_id = VALUES(building_id), ")
+							.append("status = VALUES(status), ")
+							.append("receive_ts = VALUES(receive_ts), ")
+							.append("alert_title = VALUES(alert_title), ")
+							.append("alert_content = VALUES(alert_content), ")
+							.append("alert_cancel_title = VALUES(alert_cancel_title), ")
+							.append("alert_cancel_content = VALUES(alert_cancel_content), ")
+							.append("raw_data = VALUES(raw_data), ")
+							.append("upload_year = VALUES(upload_year), ")
+							.append("upload_month = VALUES(upload_month), ")
+							.append("upload_day = VALUES(upload_day), ")
+							.append("dashboard_status = IF(? = 1 AND VALUES(status) = 'alert_cancel' AND dashboard_status = 'alert', dashboard_status, VALUES(status))");
+					//retainAlert 分组了，只加一次
+					params.add(retainAlert);
+					jdbcTemplate.update(sql.toString(), params.toArray());
+				});
 
 			} finally {
 				DataSourceContextHolder.clearCurrentDataSourceKey();