Meta を二重にデータベースに保存できないように

src/misc/fetch-meta.ts

 import { Meta } from '../models/entities/meta';
 import { Metas } from '../models';
-import { genId } from './gen-id';
 
 export default async function(): Promise<Meta> {
 	const meta = await Metas.findOne();
@@ -8,7 +7,7 @@ export default async function(): Promise<Meta> {
 		return meta;
 	} else {
 		return Metas.save({
-			id: genId(),
+			id: 'x'
 		} as Meta);
 	}
 }

src/models/entities/meta.ts

 import { Entity, Column, PrimaryColumn } from 'typeorm';
-import { id } from '../id';
 
 @Entity()
 export class Meta {
-	@PrimaryColumn(id())
+	@PrimaryColumn({
+		type: 'varchar',
+		length: 32
+	})
 	public id: string;
 
 	@Column('varchar', {