database: Add fetch() for SessionDao

database/sessiondaosqlite.h

@@ -6,11 +6,15 @@
 
 class SessionDaoSqlite : public SessionDao, protected SqliteDao
 {
+private:
+  void fillSession(int userid, Session &sess);
+
   public:
 	SessionDaoSqlite();
 	void save(const Session &session) override;
 	std::optional<Session> find(std::string token) override;
 	void deleteSession(std::string token) override;
+	std::vector<Session> fetch() override;
 	using SqliteDao::SqliteDao;
 };