ドメインは常にPunycodeで保存するように

src/services/register-or-fetch-instance-doc.ts

@@ -2,10 +2,13 @@ import { Instance } from '../models/entities/instance';
 import { Instances } from '../models';
 import { federationChart } from './chart';
 import { genId } from '../misc/gen-id';
+import { toPuny } from '../misc/convert-host';
 
 export async function registerOrFetchInstanceDoc(host: string): Promise<Instance> {
 	if (host == null) return null;
 
+	host = toPuny(host);
+
 	const index = await Instances.findOne({ host });
 
 	if (index == null) {