diff --git a/app/src/main/java/com/yovinchen/bookkeeping/ui/screen/CategoryDetailScreen.kt b/app/src/main/java/com/yovinchen/bookkeeping/ui/screen/CategoryDetailScreen.kt
index da17a00..24ea722 100644
--- a/app/src/main/java/com/yovinchen/bookkeeping/ui/screen/CategoryDetailScreen.kt
+++ b/app/src/main/java/com/yovinchen/bookkeeping/ui/screen/CategoryDetailScreen.kt
@@ -26,7 +26,6 @@ import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
diff --git a/app/src/main/java/com/yovinchen/bookkeeping/viewmodel/CategoryDetailViewModel.kt b/app/src/main/java/com/yovinchen/bookkeeping/viewmodel/CategoryDetailViewModel.kt
index 295f113..3ddd877 100644
--- a/app/src/main/java/com/yovinchen/bookkeeping/viewmodel/CategoryDetailViewModel.kt
+++ b/app/src/main/java/com/yovinchen/bookkeeping/viewmodel/CategoryDetailViewModel.kt
@@ -1,21 +1,27 @@
 package com.yovinchen.bookkeeping.viewmodel
 
 import androidx.lifecycle.ViewModel
-import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.MemberStat
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.stateIn
 import java.time.YearMonth
 import java.time.ZoneId
 import java.util.Date
 
 class CategoryDetailViewModel(
-    private val database: BookkeepingDatabase,
-    private val category: String,
-    private val startMonth: YearMonth,
-    private val endMonth: YearMonth
+    database: BookkeepingDatabase,
+    category: String,
+    startMonth: YearMonth,
+    endMonth: YearMonth
 ) : ViewModel() {
     private val recordDao = database.bookkeepingDao()