Add PObjectStateHist class for state history tracking

Introduces the `PObjectStateHist` class in the `WorkFlow.Domain.Entities` namespace, mapped to the `TBMWF_PROFILE_OBJ_STATE_HISTORY` table. The class includes properties with data annotations for validation and schema mapping, addressing nullable fields treated as required in application logic. A `ToList()` method is added to return state-related strings, enhancing functionality.

src/WorkFlow.Domain/Entities/PObjectStateHist.cs

@@ -0,0 +1,72 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace WorkFlow.Domain.Entities;
+
+[Table("TBMWF_PROFILE_OBJ_STATE_HISTORY", Schema = "dbo")]
+public class PObjectStateHist
+{
+    [Key]
+    [Column("GUID", TypeName = "bigint")]
+    public long Id { get; set; }
+
+    /// <summary>
+    /// Although this field is marked as <c>nullable</c> in the database schema to allow 
+    /// for greater flexibility during database-level operations or migrations, it is 
+    /// treated as <c>required</c> and <c>not null</c> within the application logic. 
+    /// Validation should be enforced at the application level to ensure a value is provided.
+    /// </summary>
+    [Column("MWF_PROFILE_ID", TypeName = "int")]
+    public int? ProfileId { get; set; }
+
+    /// <summary>
+    /// Although this field is marked as <c>nullable</c> in the database schema to allow 
+    /// for greater flexibility during database-level operations or migrations, it is 
+    /// treated as <c>required</c> and <c>not null</c> within the application logic. 
+    /// Validation should be enforced at the application level to ensure a value is provided.
+    /// </summary>
+    [Column("USR_ID", TypeName = "int")]
+    public int? UserId { get; set; }
+
+    /// <summary>
+    /// Although this field is marked as <c>nullable</c> in the database schema to allow 
+    /// for greater flexibility during database-level operations or migrations, it is 
+    /// treated as <c>required</c> and <c>not null</c> within the application logic. 
+    /// Validation should be enforced at the application level to ensure a value is provided.
+    /// </summary>
+    [Column("OBJ_ID", TypeName = "bigint")]
+    public long? ObjectId { get; set; }
+
+    [Required]
+    [Column("STATE_ID", TypeName = "int")]
+    public int StateId { get; set; }
+
+    [Column("STATE2", TypeName = "nvarchar(100)")]
+    [StringLength(100)]
+    public string? State2 { get; set; }
+
+    [Column("STATE3", TypeName = "nvarchar(100)")]
+    [StringLength(100)]
+    public string? State3 { get; set; }
+
+    [Column("STATE4", TypeName = "nvarchar(100)")]
+    [StringLength(100)]
+    public string? State4 { get; set; }
+
+    [Column("CHANGED_WHO", TypeName = "nvarchar(100)")]
+    [StringLength(100)]
+    public string? ChangedWho { get; set; }
+
+    [Column("CHANGED_WHEN", TypeName = "datetime")]
+    public DateTime? ChangedWhen { get; set; }
+
+    [ForeignKey("StateId")]
+    public virtual State? State1 { get; set; }
+
+    public virtual IEnumerable<PControlsTF>? TFControls { get; set; }
+
+    public IEnumerable<string?> ToList() => new List<string?>
+    {
+        State1?.IntlState, State2, State3, State4
+    };
+}