WIP page leaf

src/isnd/Data/Packages/PackageVersion.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using isn.abst;
+using isnd.Data.Packages;
+using isnd.Data.Packages.Catalog;
+using Newtonsoft.Json;
+
+namespace isnd.Data
+{
+    public class PackageVersion
+    {
+        [Required]
+        [ForeignKey("Package")]
+        [StringLength(1024)]
+        public string PackageId { get; set; }
+
+        [Required]
+        public int Major { get; set; }
+        
+        [Required]
+        public int Minor { get; set; }
+        
+        [Required]
+        public int Patch { get; set; }
+
+        [StringLength(256)]
+        [Required][Key]
+        public string FullString { get; set; }
+        public bool IsPrerelease { get; set; }
+
+        [StringLength(256)]
+        public string Type { get; set; }
+
+        [JsonIgnore]
+        public virtual Package Package { get; set; }
+
+        [Required][JsonIgnore]
+        [ForeignKey("LatestCommit")]
+        public long CommitNId { get; set; }
+
+        [NotMapped]
+
+        public string CommitId { get => CommitNId.ToString(); }
+
+        public virtual Commit LatestCommit{ get; set; }
+        public string NugetLink => $"/{Constants.PaquetFileEstension}/{PackageId}/{FullString}/{PackageId}-{FullString}."
+         + Constants.PaquetFileEstension;
+        public string NuspecLink => $"/{Constants.SpecFileEstension}/{PackageId}/{FullString}/{PackageId}-{FullString}."
+         + Constants.SpecFileEstension;
+
+    }
+}