diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
index b268ef3..00829ac 100644
--- a/.idea/deploymentTargetSelector.xml
+++ b/.idea/deploymentTargetSelector.xml
@@ -4,6 +4,14 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-12-23T05:39:49.548656200Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=41311FDJH002F7" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
       </SelectionState>
     </selectionStates>
   </component>
diff --git a/app/src/main/java/com/example/tampopo_client/models/Activity.java b/app/src/main/java/com/example/tampopo_client/models/Activity.java
index 6dcf984..fd54d94 100644
--- a/app/src/main/java/com/example/tampopo_client/models/Activity.java
+++ b/app/src/main/java/com/example/tampopo_client/models/Activity.java
@@ -1,9 +1,16 @@
 package com.example.tampopo_client.models;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 public class Activity {
     private String userId;
+    
+    @JsonProperty("activity-id")
     private String activityId;
+    
     private String text;
+    
+    @JsonProperty("updated-time")
     private String updateTime;
 
     public Activity(String userId, String activityId, String text, String updateTime) {