diff --git a/ruoyi-ems/src/main/java/org/dromara/ems/record/domain/RecordIotenvInstant.java b/ruoyi-ems/src/main/java/org/dromara/ems/record/domain/RecordIotenvInstant.java
index 82fcec7..7b63b64 100644
--- a/ruoyi-ems/src/main/java/org/dromara/ems/record/domain/RecordIotenvInstant.java
+++ b/ruoyi-ems/src/main/java/org/dromara/ems/record/domain/RecordIotenvInstant.java
@@ -101,6 +101,12 @@ public class RecordIotenvInstant extends BaseEntity
     /** 采样间隔（分钟），用于数据抽稀 */
     private Integer samplingInterval;
 
+    /**
+     * 抽样粒度（SECOND / MINUTE / HOUR）。
+     * 这里显式把粒度透传下来，是为了让秒级回溯不再被分钟抽样逻辑“偷换口径”。
+     */
+    private String samplingGranularity;
+
     /** 振动参数选择（用于查询过滤）：vibrationSpeed/vibrationDisplacement/vibrationAcceleration/vibrationTemp */
     private String vibrationParam;