♻️ Centralized data models (wip)

DysonNetwork.Shared/Models/Activity.cs

@@ -0,0 +1,37 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using NodaTime;
+
+namespace DysonNetwork.Shared.Models;
+
+public interface IActivity
+{
+    public SnActivity ToActivity();
+}
+
+[NotMapped]
+public class SnActivity : ModelBase
+{
+    public Guid Id { get; set; }
+    [MaxLength(1024)] public string Type { get; set; } = null!;
+    [MaxLength(4096)] public string ResourceIdentifier { get; set; } = null!;
+    [Column(TypeName = "jsonb")] public Dictionary<string, object> Meta { get; set; } = new();
+
+    public object? Data { get; set; }
+
+    // Outdated fields, for backward compability
+    public int Visibility => 0;
+
+    public static SnActivity Empty()
+    {
+        var now = SystemClock.Instance.GetCurrentInstant();
+        return new SnActivity
+        {
+            CreatedAt = now,
+            UpdatedAt = now,
+            Id = Guid.NewGuid(),
+            Type = "empty",
+            ResourceIdentifier = "none"
+        };
+    }
+}