feat: shard status update, delete old messages when they expire

Catalogger.Backend/Services/BackgroundTasksService.cs

@@ -0,0 +1,35 @@
+using Catalogger.Backend.Database;
+using Catalogger.Backend.Database.Queries;
+
+namespace Catalogger.Backend.Services;
+
+public class BackgroundTasksService(ILogger logger, IServiceProvider services) : BackgroundService
+{
+    private readonly ILogger _logger = logger.ForContext<BackgroundTasksService>();
+
+    protected override async Task ExecuteAsync(CancellationToken ct)
+    {
+        using var timer = new PeriodicTimer(TimeSpan.FromMinutes(1));
+        while (await timer.WaitForNextTickAsync(ct))
+            await HandlePeriodicTasksAsync(ct);
+    }
+
+    private async Task HandlePeriodicTasksAsync(CancellationToken ct = default)
+    {
+        _logger.Information("Running once per minute periodic tasks");
+
+        await using var scope = services.CreateAsyncScope();
+        var messageRepository = scope.ServiceProvider.GetRequiredService<MessageRepository>();
+
+        var (msgCount, ignoredCount) = await messageRepository.DeleteExpiredMessagesAsync();
+        if (msgCount != 0 || ignoredCount != 0)
+        {
+            _logger.Information(
+                "Deleted {Count} messages and {IgnoredCount} ignored message IDs older than {MaxDays} days old",
+                msgCount,
+                ignoredCount,
+                MessageRepository.MaxMessageAgeDays
+            );
+        }
+    }
+}