first commit

BookHive/Models/Book.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BookHive.Models;
+
+public class Book
+{
+    [Key] public int Id { get; set; }
+    [Required, MaxLength(200)] public string? Title { get; set; }
+    [Required] public string? Isbn { get; set; }
+    [MaxLength(3000)] public string? Summary { get; set; }
+    [Required] public int PageCount { get; set; }
+    [Required] public DateOnly PublishedDate { get; set; }
+    [Required, MaxLength(50)] public string? Genre { get; set; }
+
+    public Author? Author { get; set; }
+    [Required] public int AuthorId { get; set; }
+    
+    public List<Loan>? Loans { get; set; }
+    public List<Review>? Reviews { get; set; }
+}