Removed the database lib from services as it is still not a service

src/libs/database/impl/Migration.hpp

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <Wt/Dbo/Dbo.h>
+
+namespace Database
+{
+    class Session;
+
+    using Version = std::size_t;
+    static constexpr Version LMS_DATABASE_VERSION{ 47 };
+    class VersionInfo
+    {
+    public:
+        using pointer = Wt::Dbo::ptr<VersionInfo>;
+
+        static VersionInfo::pointer getOrCreate(Session& session);
+        static VersionInfo::pointer get(Session& session);
+
+        Version getVersion() const { return _version; }
+        void setVersion(Version version) { _version = static_cast<int>(version); }
+
+        template<class Action>
+        void persist(Action& a)
+        {
+            Wt::Dbo::field(a, _version, "db_version");
+        }
+
+    private:
+        int _version{ LMS_DATABASE_VERSION };
+    };
+
+    namespace Migration
+    {
+        void doDbMigration(Session& session);
+    }
+}