cherrypick/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();
	if (meta) {
		return meta;
	} else {
		return Metas.save({
			id: genId(),
		} as Meta);
	}
}