Add calendar integrations and collaboration updates

backend/src/Socialize.Api/Modules/CalendarIntegrations/Services/CalendarImportBackgroundService.cs

@@ -0,0 +1,34 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Services;
+
+public sealed class CalendarImportBackgroundService(
+    IServiceScopeFactory scopeFactory,
+    ILogger<CalendarImportBackgroundService> logger)
+    : BackgroundService
+{
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        using PeriodicTimer timer = new(TimeSpan.FromHours(6));
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            await RefreshDueSourcesAsync(stoppingToken);
+            await timer.WaitForNextTickAsync(stoppingToken);
+        }
+    }
+
+    private async Task RefreshDueSourcesAsync(CancellationToken stoppingToken)
+    {
+        try
+        {
+            using IServiceScope scope = scopeFactory.CreateScope();
+            CalendarImportSyncService syncService = scope.ServiceProvider.GetRequiredService<CalendarImportSyncService>();
+            await syncService.RefreshDueSourcesAsync(stoppingToken);
+        }
+        catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+        {
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Calendar import background sync failed.");
+        }
+    }
+}