diff --git a/composeApp/src/commonMain/kotlin/com/tt/honeyDue/viewmodel/ResidenceViewModel.kt b/composeApp/src/commonMain/kotlin/com/tt/honeyDue/viewmodel/ResidenceViewModel.kt
index 8e1db03..9a3a850 100644
--- a/composeApp/src/commonMain/kotlin/com/tt/honeyDue/viewmodel/ResidenceViewModel.kt
+++ b/composeApp/src/commonMain/kotlin/com/tt/honeyDue/viewmodel/ResidenceViewModel.kt
@@ -70,15 +70,26 @@ class ResidenceViewModel(
     /** Drives the residence-scoped projections. */
     private val _selectedResidenceId = MutableStateFlow<Int?>(null)
 
+    /// Residence-scoped kanban derived from `DataManager.allTasks` filtered
+    /// by `_selectedResidenceId`. Single source of truth — eliminates the
+    /// gitea#2 race window where the per-residence cache slot could be
+    /// empty while `_allTasks` was populated. The per-residence cache
+    /// (`tasksByResidence`) was deleted in cec521b.
     val residenceTasksState: StateFlow<ApiResult<TaskColumnsResponse>> =
-        combine(_selectedResidenceId, dataManager.tasksByResidence) { id, map ->
-            if (id == null) ApiResult.Idle
-            else map[id]?.let { ApiResult.Success(it) } ?: ApiResult.Idle
+        combine(_selectedResidenceId, DataManager.allTasks) { id, all ->
+            when {
+                id == null -> ApiResult.Idle
+                all == null -> ApiResult.Loading
+                else -> {
+                    val filtered = DataManager.getTasksForResidence(id)
+                    if (filtered != null) ApiResult.Success(filtered) else ApiResult.Loading
+                }
+            }
         }.stateIn(
             viewModelScope,
             SharingStarted.Eagerly,
             _selectedResidenceId.value?.let { id ->
-                dataManager.tasksByResidence.value[id]?.let { ApiResult.Success(it) }
+                DataManager.getTasksForResidence(id)?.let { ApiResult.Success(it) }
             } ?: ApiResult.Idle,
         )