prevent deletion or suspension of system accounts

packages/backend/src/misc/is-system-account.ts

@@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * Checks if the given user represents a system account, such as instance.actor.
+ */
+export function isSystemAccount(user: { readonly username: string }): boolean {
+	return user.username.includes('.');
+}