♻️ Better delivery service for AP

DysonNetwork.Shared/Models/ActivityPubDelivery.cs

@@ -0,0 +1,35 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using NodaTime;
+
+namespace DysonNetwork.Shared.Models;
+
+public class SnActivityPubDelivery : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [MaxLength(2048)] public string ActivityId { get; set; } = null!;
+    [MaxLength(128)] public string ActivityType { get; set; } = null!;
+    [MaxLength(2048)] public string InboxUri { get; set; } = null!;
+    [MaxLength(2048)] public string ActorUri { get; set; } = null!;
+    
+    public DeliveryStatus Status { get; set; } = DeliveryStatus.Pending;
+    public int RetryCount { get; set; } = 0;
+    
+    [MaxLength(4096)] public string? ErrorMessage { get; set; }
+    
+    public Instant? LastAttemptAt { get; set; }
+    public Instant? NextRetryAt { get; set; }
+    public Instant? SentAt { get; set; }
+    
+    [MaxLength(2048)] public string? ResponseStatusCode { get; set; }
+}
+
+public enum DeliveryStatus
+{
+    Pending,
+    Processing,
+    Sent,
+    Failed,
+    ExhaustedRetries
+}