✨ Notification service

DysonNetwork.Sphere/Account/Notification.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json.Serialization;
+using Microsoft.EntityFrameworkCore;
+using NodaTime;
+
+namespace DysonNetwork.Sphere.Account;
+
+public class Notification : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    [MaxLength(1024)] public string? Title { get; set; }
+    [MaxLength(2048)] public string? Subtitle { get; set; }
+    [MaxLength(4096)] public string? Content { get; set; }
+    [Column(TypeName = "jsonb")] public Dictionary<string, object>? Meta { get; set; }
+    public int Priority { get; set; } = 10;
+    public Instant? ViewedAt { get; set; }
+
+    public long AccountId { get; set; }
+    [JsonIgnore] public Account Account { get; set; } = null!;
+}
+
+public enum NotificationPushProvider
+{
+    Apple,
+    Google
+}
+
+[Index(nameof(DeviceId), IsUnique = true)]
+[Index(nameof(DeviceToken), IsUnique = true)]
+public class NotificationPushSubscription : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    [MaxLength(4096)] public string DeviceId { get; set; } = null!;
+    [MaxLength(4096)] public string DeviceToken { get; set; } = null!;
+    public NotificationPushProvider Provider { get; set; }
+    public Instant? LastUsedAt { get; set; }
+
+    public long AccountId { get; set; }
+    [JsonIgnore] public Account Account { get; set; } = null!;
+}