Refactor code structure for improved readability and maintainability

Models/DeploymentJobModel.cs

@@ -0,0 +1,46 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Microsoft.SelfService.Portal.Core.API.Models
+{
+    public class QueueJobModel : BaseModel
+    {
+        [Column(Order = 1)]
+        public string Type { get; set; }
+
+        [Column(Order = 2)]
+        public string Status { get; set; } = QueueJobStatus.Pending;
+
+        [Column(Order = 3)]
+        public string PayloadJson { get; set; }
+
+        [Column(Order = 4)]
+        public int Attempts { get; set; }
+
+        [Column(Order = 5)]
+        public int MaxAttempts { get; set; } = 3;
+
+        [Column(Order = 6)]
+        public DateTime? Started { get; set; }
+
+        [Column(Order = 7)]
+        public DateTime? Finished { get; set; }
+
+        [Column(Order = 8)]
+        public DateTime? LockedUntil { get; set; }
+
+        [Column(Order = 9)]
+        public string? LockedBy { get; set; }
+
+        [Column(Order = 10)]
+        public string? ErrorMessage { get; set; }
+
+        [Column(Order = 11)]
+        public string? MetadataJson { get; set; }
+
+        [Column(Order = 12)]
+        public string? RuleSnapshotJson { get; set; }
+
+        public ICollection<QueueJobTargetModel> Targets { get; set; } = new List<QueueJobTargetModel>();
+        public ICollection<QueueJobStepModel> Steps { get; set; } = new List<QueueJobStepModel>();
+    }
+}