* Extended functionalities

* Added different UIs

MealPlan.Api/Services/DbRefreshTokenStore.cs

@@ -0,0 +1,68 @@
+using MealPlan.Api.Data;
+using MealPlan.Api.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace MealPlan.Api.Services;
+
+/// <summary>Persists refresh tokens in PostgreSQL (survives API restarts).</summary>
+public class DbRefreshTokenStore : IRefreshTokenStore
+{
+    private readonly IServiceScopeFactory _scopeFactory;
+
+    public DbRefreshTokenStore(IServiceScopeFactory scopeFactory) => _scopeFactory = scopeFactory;
+
+    public void Add(RefreshToken token)
+    {
+        using var scope = _scopeFactory.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        db.RefreshTokens.Add(new RefreshTokenEntity
+        {
+            Token = token.Token,
+            UserId = Guid.Parse(token.UserId),
+            ExpiresAtUtc = token.ExpiresAtUtc,
+            CreatedAtUtc = token.CreatedAtUtc,
+            IsRevoked = false,
+        });
+        db.SaveChanges();
+    }
+
+    public RefreshToken? Get(string token)
+    {
+        using var scope = _scopeFactory.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        var entity = db.RefreshTokens.AsNoTracking().FirstOrDefault(t => t.Token == token);
+        return entity is null ? null : Map(entity);
+    }
+
+    public RefreshToken? Revoke(string token)
+    {
+        using var scope = _scopeFactory.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        var entity = db.RefreshTokens.FirstOrDefault(t => t.Token == token);
+        if (entity is null) return null;
+        var wasActive = entity.IsActive;
+        entity.IsRevoked = true;
+        db.SaveChanges();
+        return wasActive ? Map(entity) : null;
+    }
+
+    public void RemoveExpired()
+    {
+        using var scope = _scopeFactory.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        var cutoff = DateTime.UtcNow;
+        db.RefreshTokens
+            .Where(t => t.IsRevoked || t.ExpiresAtUtc <= cutoff)
+            .ExecuteDelete();
+    }
+
+    private static RefreshToken Map(RefreshTokenEntity entity) => new()
+    {
+        Token = entity.Token,
+        UserId = entity.UserId.ToString(),
+        ExpiresAtUtc = entity.ExpiresAtUtc,
+        CreatedAtUtc = entity.CreatedAtUtc,
+        IsRevoked = entity.IsRevoked,
+    };
+}