upd: ready to write the database and engine

backend/include/database.h

@@ -0,0 +1,28 @@
+#ifndef PROTECTOR_DATABASE_HPP
+#define PROTECTOR_DATABASE_HPP
+#include <string>
+#include <vector>
+
+#include "bs-utility.h"
+#include "drivearray.hpp"
+#include "key2index.hpp"
+
+class UserDataBase {
+  DriveArray<UserItemClass> full_user_data;
+  String2Index user_name2index;
+
+ public:
+  UserDataBase() = default;
+  void Open(std::string file_name);
+  bool PAM(const std::string &user_id, const std::string &password);
+};
+class BookDataBase {
+  ;
+};
+class FinanceDataBase {
+  ;
+};
+class OperationLogDataBase {
+  ;
+};
+#endif  // PROTECTOR_DATABASE_HPP