refactoring

Resolve #7779

packages/backend/src/misc/keypair-store.ts

@@ -0,0 +1,10 @@
+import { UserKeypairs } from '@/models/index';
+import { User } from '@/models/entities/user';
+import { UserKeypair } from '@/models/entities/user-keypair';
+import { Cache } from './cache';
+
+const cache = new Cache<UserKeypair>(Infinity);
+
+export async function getUserKeypair(userId: User['id']): Promise<UserKeypair> {
+	return await cache.fetch(userId, () => UserKeypairs.findOneOrFail(userId));
+}