public BirthClinicPlanningService()
        {
            var client   = new MongoClient(ConnectionString);
            var database = client.GetDatabase(BirthClinicPlanningDb);

            Births       = database.GetCollection <Birth>(BirthCollection);
            Reservations = database.GetCollection <Reservation>(ReservationCollection);
            Rooms        = database.GetCollection <Room>(RoomCollection);
            Employees    = database.GetCollection <Employee>(EmployeeCollection);

            var  filterRoom    = Builders <Room> .Filter.Empty;
            long numberOfRooms = Rooms.CountDocuments(filterRoom);

            if (numberOfRooms == 0)
            {
                SeedRooms(Rooms);
            }

            var  filterEmployees   = Builders <Employee> .Filter.Empty;
            long numberOfEmployees = Employees.CountDocuments(filterEmployees);

            if (numberOfEmployees == 0)
            {
                SeedEmployees(Employees);
            }
        }