Initial commit

MealPlan.Api/Services/RefreshTokenCleanupService.cs

@@ -0,0 +1,35 @@
+namespace MealPlan.Api.Services;
+
+/// <summary>
+/// Periodically purges expired and revoked refresh tokens from the in-memory store.
+/// </summary>
+public class RefreshTokenCleanupService : BackgroundService
+{
+    private readonly IRefreshTokenStore _store;
+    private readonly ILogger<RefreshTokenCleanupService> _logger;
+
+    public RefreshTokenCleanupService(
+        IRefreshTokenStore store,
+        ILogger<RefreshTokenCleanupService> logger)
+    {
+        _store = store;
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            try
+            {
+                _store.RemoveExpired();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Refresh token cleanup failed");
+            }
+
+            await Task.Delay(TimeSpan.FromHours(1), stoppingToken);
+        }
+    }
+}