Added support for database maintenance. Added core plugin.

core/service.h

@@ -3,6 +3,7 @@
 
 #include <QList>
 #include <QSharedPointer>
+#include <QString>
 
 #include <odb/core.hxx>
 #include <odb/transaction.hxx>
@@ -39,6 +40,9 @@ public:
 
     void save(QSharedPointer<T> entity) {
         odb::database *db = Context::instance().db();
+
+        Q_ASSERT(db);
+
         Transaction tx;
         db->persist(entity);
         tx.commit();
@@ -46,11 +50,21 @@ public:
 
     QSharedPointer<T> loadById(int id) {
         odb::database *db = Context::instance().db();
+
+        Q_ASSERT(db);
+
         Transaction tx;
         QSharedPointer<T> entity = db->template load<T>(id);
         tx.commit();
         return entity;
     }
+
+    void setPluginId(const QString &pluginId) {
+        m_pluginId = pluginId;
+    }
+
+private:
+    QString m_pluginId;
 };
 
 #endif // SERVICE_H