✨ Pusher service basis

DysonNetwork.Pusher/Notification/PushSubscription.cs

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+using System.ComponentModel.DataAnnotations;
+using DysonNetwork.Shared.Data;
+using Microsoft.EntityFrameworkCore;
+using NodaTime;
+
+namespace DysonNetwork.Pusher.Notification;
+
+public enum PushProvider
+{
+    Apple,
+    Google
+}
+
+[Index(nameof(AccountId), nameof(DeviceId), nameof(DeletedAt), IsUnique = true)]
+public class PushSubscription : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid AccountId { get; set; }
+    [MaxLength(8192)] public string DeviceId { get; set; } = null!;
+    [MaxLength(8192)] public string DeviceToken { get; set; } = null!;
+    public PushProvider Provider { get; set; }
+    
+    public int CountDelivered { get; set; }
+    public Instant? LastUsedAt { get; set; }
+}