Add project files

T120B165-ImgBoard/Models/File.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace T120B165_ImgBoard.Models;
+
+public class File
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+    // The physical path where the file is stored
+    public required string FilePath { get; set; }
+    // Original file name uploaded by the user
+    public required string OriginalFileName { get; set; }
+    // The size of the file in bytes
+    public required long Size { get; set; }
+    // The MIME type, will be validated at the end of the upload
+    public required string ContentType { get; set; }
+    // Tracks when the file metadata was created/upload process started
+    public required DateTime CreatedDate { get; set; } 
+    // Tracks when the file was successfully finalized
+    // Null until the final PATCH request completes
+    public DateTime? FinishedDate { get; set; }
+}