diff --git a/src/entity/trx_maintenance_groups.ts b/src/entity/trx_maintenance_groups.ts
index 4c149cd..0ba8eb8 100644
--- a/src/entity/trx_maintenance_groups.ts
+++ b/src/entity/trx_maintenance_groups.ts
@@ -36,6 +36,9 @@ export class TrxMaintenanceGroup {
 	})
 	status: TrxMaintenanceGroupStatus;
 
+	@Column({ nullable: true })
+	start_at: Date;
+
 	@Column()
 	@CreateDateColumn()
 	created_at: Date;
diff --git a/src/entity/trx_maintenances.ts b/src/entity/trx_maintenances.ts
index 4c7c551..af7bfbc 100644
--- a/src/entity/trx_maintenances.ts
+++ b/src/entity/trx_maintenances.ts
@@ -59,9 +59,6 @@ export class TrxMaintenance {
 	@Column({ nullable: true })
 	request_at: Date;
 
-	@Column({ nullable: true })
-	start_at: Date;
-
 	@Column()
 	@CreateDateColumn()
 	created_at: Date;