feat: add database worker with timer for building database at start up and refreshing once every hour.

src/SanctionsSearch.Worker/Workers/DatabaseWorker.cs

@@ -0,0 +1,63 @@
+namespace SanctionsSearch.Worker.Workers;
+
+public class DatabaseWorker(
+  ILogger<DatabaseWorker> logger,
+  TimeProvider timeProvider,
+  IServiceScopeFactory serviceScopeFactory
+) : IHostedService, IDisposable
+{
+  private readonly TimeProvider _timeProvider = timeProvider;
+  private readonly ILogger<DatabaseWorker> _logger = logger;
+  private readonly IServiceScopeFactory _serviceScopeFactory = serviceScopeFactory;
+  private ITimer? _timer;
+
+  public async Task StartAsync(CancellationToken cancellationToken)
+  {
+    _logger.LogInformation("Database worker started");
+
+    await UpdateDatabase();
+
+    _timer = _timeProvider.CreateTimer(
+      callback: async _ => await UpdateDatabase(),
+      state: null,
+      dueTime: TimeSpan.FromHours(1),
+      period: TimeSpan.FromHours(1)
+    );
+  }
+
+  public Task StopAsync(CancellationToken cancellationToken)
+  {
+    _logger.LogInformation("Database worker stopped");
+
+    _timer?.Change(Timeout.InfiniteTimeSpan, TimeSpan.Zero);
+
+    return Task.CompletedTask;
+  }
+
+  public void Dispose()
+  {
+    _timer?.Dispose();
+  }
+
+  private async Task UpdateDatabase()
+  {
+    _logger.LogInformation("Updating database");
+
+    try
+    {
+      using var scope = _serviceScopeFactory.CreateAsyncScope();
+      var databaseMaintainer = scope.ServiceProvider.GetRequiredService<IDatabaseMaintainer>();
+
+      await databaseMaintainer.BuildSdnTableAsync();
+      await databaseMaintainer.BuildAddressTableAsync();
+      await databaseMaintainer.BuiltAliasTableAsync();
+      await databaseMaintainer.BuildCommentTableAsync();
+
+      _logger.LogInformation("Database updated");
+    }
+    catch (Exception ex)
+    {
+      _logger.LogError(ex, "Error updating database");
+    }
+  }
+}