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diff --git a/meshmc/launcher/meta/Index.h b/meshmc/launcher/meta/Index.h
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * Copyright 2015-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QAbstractListModel>
+#include <memory>
+
+#include "BaseEntity.h"
+
+class Task;
+
+namespace Meta
+{
+	using VersionListPtr = std::shared_ptr<class VersionList>;
+	using VersionPtr = std::shared_ptr<class Version>;
+
+	class Index : public QAbstractListModel, public BaseEntity
+	{
+		Q_OBJECT
+	  public:
+		explicit Index(QObject* parent = nullptr);
+		explicit Index(const QVector<VersionListPtr>& lists,
+					   QObject* parent = nullptr);
+
+		enum { UidRole = Qt::UserRole, NameRole, ListPtrRole };
+
+		QVariant data(const QModelIndex& index, int role) const override;
+		int rowCount(const QModelIndex& parent) const override;
+		int columnCount(const QModelIndex& parent) const override;
+		QVariant headerData(int section, Qt::Orientation orientation,
+							int role) const override;
+
+		QString localFilename() const override
+		{
+			return "index.json";
+		}
+
+		// queries
+		VersionListPtr get(const QString& uid);
+		VersionPtr get(const QString& uid, const QString& version);
+		bool hasUid(const QString& uid) const;
+
+		QVector<VersionListPtr> lists() const
+		{
+			return m_lists;
+		}
+
+	  public: // for usage by parsers only
+		void merge(const std::shared_ptr<Index>& other);
+		void parse(const QJsonObject& obj) override;
+
+	  private:
+		QVector<VersionListPtr> m_lists;
+		QHash<QString, VersionListPtr> m_uids;
+
+		void connectVersionList(const int row, const VersionListPtr& list);
+	};
+} // namespace Meta