diff --git a/src/draw/coordinate.entity.ts b/src/draw/coordinate.entity.ts
index e9fa35a222c8670171b8b1c4971a70334d34e193..75502e80c6633bd6e3cf8a03c2079bdc0b96fa47 100644
--- a/src/draw/coordinate.entity.ts
+++ b/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;