first commit

BookHive/Models/Author.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BookHive.Models;
+
+public class Author
+{
+    [Key]public int Id { get; set; }
+    [Required, MaxLength(100)] public string? FirstName { get; set; }
+    [Required, MaxLength(100)] public string? LastName { get; set; }
+    [MaxLength(2000)] public string? Biography { get; set; }
+    [Required] public DateOnly BirthDate { get; set; }
+    [Required, MaxLength(60)] public string? Nationality { get; set; }
+    
+    public List<Book>? Books { get; set; }
+}

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; }
+}

BookHive/Models/Loan.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BookHive.Models;
+
+public class Loan
+{
+    [Key] public int Id { get; set; }
+    
+    public Book? Book { get; set; }
+    [Required] public int BookId { get; set; }
+    
+    public Member? Member { get; set; }
+    [Required] public int MemberId { get; set; }
+    
+    [Required] public DateOnly LoanDate { get; set; }
+    [Required] public DateOnly DueDate { get; set; }
+    public DateOnly? ReturnDate { get; set; }
+}

BookHive/Models/Member.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BookHive.Models;
+
+public class Member
+{
+    [Key] public int Id { get; set; }
+    [Required, EmailAddress] public string? Email { get; set; }
+    [Required, MaxLength(100)] public string? FirstName { get; set; }
+    [Required, MaxLength(100)] public string? LastName { get; set; }
+    [Required] public DateOnly MembershipDate { get; set; }
+    [Required] public bool IsActive { get; set; } = true; 
+    
+    public List<Loan>? Loans { get; set; }
+    public List<Review>? Reviews { get; set; }
+}

BookHive/Models/Review.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BookHive.Models;
+
+public class Review
+{
+    [Key] public int Id { get; set; }
+    
+    public Book? Book { get; set; }
+    [Required] public int BookId { get; set; }
+    
+    public Member? Member { get; set; }
+    [Required] public int MemberId { get; set; }
+    
+    [Required] public int Rating { get; set; }
+    [MaxLength(1000)] public string? Comment { get; set; }
+    [Required] public DateTime? CreatedAt { get; set; } =  DateTime.Now;
+}