refactoring

Resolve #7779

packages/backend/src/misc/identifiable-error.ts

@@ -0,0 +1,13 @@
+/**
+ * ID付きエラー
+ */
+export class IdentifiableError extends Error {
+	public message: string;
+	public id: string;
+
+	constructor(id: string, message?: string) {
+		super(message);
+		this.message = message || '';
+		this.id = id;
+	}
+}