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DatabaseConnection/Model/Author.cs

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+namespace DatabaseConnection.Model
+{
+    public class Author
+    {
+        public int Id { get; set; }
+        public string? Name { get; set; }
+        public string? Surname { get; set; }
+        public string? Birthdate { get; set; }
+    }
+}

DatabaseConnection/Model/Book.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DatabaseConnection.Model
+{
+    public class Book
+    {
+        public int Id { get; set; }
+        public string? Title {  get; set; }
+        public string? Author {  get; set; }
+        public string? Category { get; set; }
+        public string? Publisher { get; set; }
+        public string? PublishDate { get; set; }
+        public double Price { get; set; }
+        public int Amount { get; set; }
+    }
+}

DatabaseConnection/Model/Reader.cs

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+namespace DatabaseConnection.Model
+{
+    public class Reader
+    {
+        public int Id { get; set; }
+        public string? Name { get; set; }
+        public string? Surname { get; set; }
+        public string? Address { get; set; }
+        public string? Birthdate { get; set; }
+        public long Number { get; set; }
+        public string? EmailAddress { get; set; }
+        public Book[] RentedBooks { get; set; }
+
+        public Reader()
+        {
+            RentedBooks = [];
+        }
+    }
+}

DatabaseConnection/Model/Worker.cs

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+namespace DatabaseConnection.Model
+{
+    public class Worker
+    {
+        public int Id { get; set; }
+        public string? Name { get; set; }
+        public string? Surname {  get; set; }
+        public string? StartOfWorking {  get; set; }
+        public string? Position {  get; set; }
+        public double HourlyRate { get; set; }
+        public string? EndOfWorking { get; set; }
+    }
+}