diff --git a/libs/prompt/domain/daily-prompt-record-entity/src/lib/daily-prompt-record-entity.ts b/libs/prompt/domain/daily-prompt-record-entity/src/lib/daily-prompt-record-entity.ts
index 09abbc5..9470e4d 100644
--- a/libs/prompt/domain/daily-prompt-record-entity/src/lib/daily-prompt-record-entity.ts
+++ b/libs/prompt/domain/daily-prompt-record-entity/src/lib/daily-prompt-record-entity.ts
@@ -3,5 +3,5 @@ export interface DailyPromptRecordEntity {
   promptId: string;
   userId: string;
   createdAt: Date;
-  completedAt: Date;
+  completedAt?: Date;
 }
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