🚨 Fix complier warnings

DysonNetwork.Pusher/AppDatabase.cs

@@ -16,7 +16,7 @@ public class AppDatabase(
 ) : DbContext(options)
 {
     public DbSet<Notification.Notification> Notifications { get; set; } = null!;
-    public DbSet<PushSubscription> PushSubscriptions { get; set; }
+    public DbSet<PushSubscription> PushSubscriptions { get; set; } = null!;
 
     protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
     {
@@ -175,4 +175,4 @@ public static class OptionalQueryExtensions
     {
         return condition ? transform(source) : source;
     }
-}
+}

DysonNetwork.Pusher/Notification/NotificationController.cs

@@ -127,7 +127,7 @@ public class NotificationController(
         [Required][MaxLength(1024)] public string Title { get; set; } = null!;
         [MaxLength(2048)] public string? Subtitle { get; set; }
         [Required][MaxLength(4096)] public string Content { get; set; } = null!;
-        public Dictionary<string, object>? Meta { get; set; }
+        public Dictionary<string, object?>? Meta { get; set; }
         public int Priority { get; set; } = 10;
     }
 
@@ -153,7 +153,7 @@ public class NotificationController(
                 Title = request.Title,
                 Subtitle = request.Subtitle,
                 Content = request.Content,
-                Meta = request.Meta,
+                Meta = request.Meta ?? [],
             },
             request.AccountId,
             save