Entities: Use 'required' and '= null!' to get rid of warnings

Elwig/Models/Entities/WineCult.cs

@@ -6,21 +6,14 @@ namespace Elwig.Models.Entities {
     [Table("wine_cultivation"), PrimaryKey("CultId"), Index("Name", IsUnique = true)]
     public class WineCult {
         [Column("cultid")]
-        public string CultId { get; set; }
+        public required string CultId { get; set; }
 
         [Column("name")]
-        public string Name { get; set; }
+        public required string Name { get; set; }
 
         [Column("description")]
         public string? Description { get; set; }
 
-        public WineCult() { }
-
-        public WineCult(string cultId, string name) {
-            CultId = cultId;
-            Name = name;
-        }
-
         public override string ToString() {
             return Name;
         }