⚡ Optimize push notification saving by introducing the flush buffer

DysonNetwork.Pusher/Notification/NotificationFlushHandler.cs

@@ -0,0 +1,28 @@
+using DysonNetwork.Shared.Cache;
+using EFCore.BulkExtensions;
+using NodaTime;
+using Quartz;
+
+namespace DysonNetwork.Pusher.Notification;
+
+public class NotificationFlushHandler(AppDatabase db, Logger<NotificationFlushHandler> logger) : IFlushHandler<Notification>
+{
+    public async Task FlushAsync(IReadOnlyList<Notification> items)
+    {
+        await db.BulkInsertAsync(items.Select(x =>
+        {
+            x.CreatedAt = SystemClock.Instance.GetCurrentInstant();
+            x.UpdatedAt = x.CreatedAt;
+            return x;
+        }), config => config.ConflictOption = ConflictOption.Ignore);
+        logger.LogInformation("Stored {Count} notifications", items.Count);
+    }
+}
+
+public class NotificationFlushJob(FlushBufferService fbs, NotificationFlushHandler hdl) : IJob
+{
+    public async Task Execute(IJobExecutionContext context)
+    {
+        await fbs.FlushAsync(hdl);
+    }
+}