diff --git a/src/constants/project.ts b/src/constants/project.ts
index e0359e1..b69aa62 100644
--- a/src/constants/project.ts
+++ b/src/constants/project.ts
@@ -83,12 +83,23 @@ export const TASK_STATUS_CLASS: Record<string, string> = {
   cancelled: 'status-abandoned',
 }
 
+// D-260616-01 删旧 5 态前的老 DB 数据兼容映射(老 DB 可能存 completed/review_ready/merged/abandoned)
+// 新 DB 经 TaskStatus::is_valid 拦截不会有,但老 DB 未迁移清理时兜底显示而非 $t() 报错
+const LEGACY_STATUS_MAP: Record<string, string> = {
+  completed: 'done',
+  review_ready: 'in_review',
+  merged: 'done',
+  abandoned: 'cancelled',
+}
+
 export function taskStatusLabel(status: string): string {
-  return TASK_STATUS_LABELS[status] ?? status
+  const mapped = LEGACY_STATUS_MAP[status] ?? status
+  return TASK_STATUS_LABELS[mapped] ?? 'tasks.status.todo'
 }
 
 export function taskStatusClass(status: string): string {
-  return TASK_STATUS_CLASS[status] ?? 'status-todo'
+  const mapped = LEGACY_STATUS_MAP[status] ?? status
+  return TASK_STATUS_CLASS[mapped] ?? 'status-todo'
 }
 
 // ── 任务优先级 ──