add timestamp to entity

src/draw/coordinate.entity.ts

@@ -4,6 +4,7 @@ import {
   PrimaryGeneratedColumn,
   ManyToOne,
   CreateDateColumn,
+  OneToMany,
 } from 'typeorm';
 
 import { GameEntity } from '../game/game.entity';
@@ -38,7 +39,7 @@ export class MapDrawingEntity {
 @Entity('MapDrawingHistory')
 export class MapDrawingHistoryEntity {
   @PrimaryGeneratedColumn('uuid') mapDrawingHistoryId: string;
-  @CreateDateColumn() timestamp: Date;
+  @Column('float') timestamp: number;
   @Column('bool') drawingIsActive: boolean;
   @Column('json') data: JSON;