perf: 优化代码

src/modules/share/entities/share-level-progress.entity.ts

@@ -2,7 +2,6 @@ import {
   Entity,
   PrimaryGeneratedColumn,
   Column,
-  CreateDateColumn,
   ManyToOne,
   JoinColumn,
   Index,
@@ -39,6 +38,6 @@ export class ShareLevelProgress {
   @Column({ type: 'int', default: 0, name: 'time_spent' })
   timeSpent!: number;
 
-  @CreateDateColumn({ name: 'completed_at' })
-  completedAt!: Date;
+  @Column({ type: 'timestamp', name: 'completed_at', nullable: true, default: null })
+  completedAt!: Date | null;
 }