fix: migrate to IDbContextFactory and remove direct AppDbContext from DI

src/NexusReader.Infrastructure/Identity/TokenLimitHandler.cs

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using NexusReader.Domain.Entities;
 using NexusReader.Infrastructure.Persistence;
+using Microsoft.EntityFrameworkCore;
 
 namespace NexusReader.Infrastructure.Identity;
 
@@ -11,12 +12,12 @@ namespace NexusReader.Infrastructure.Identity;
 /// </summary>
 public class TokenLimitHandler : AuthorizationHandler<TokenLimitRequirement>
 {
-    private readonly AppDbContext _dbContext;
+    private readonly IDbContextFactory<AppDbContext> _dbContextFactory;
     private readonly UserManager<NexusUser> _userManager;
 
-    public TokenLimitHandler(AppDbContext dbContext, UserManager<NexusUser> userManager)
+    public TokenLimitHandler(IDbContextFactory<AppDbContext> dbContextFactory, UserManager<NexusUser> userManager)
     {
-        _dbContext = dbContext;
+        _dbContextFactory = dbContextFactory;
         _userManager = userManager;
     }
 

src/NexusReader.Web.New/Program.cs

@@ -135,7 +135,8 @@ using (var scope = app.Services.CreateScope())
 {
     var services = scope.ServiceProvider;
     var logger = services.GetRequiredService<ILogger<Program>>();
-    var dbContext = services.GetRequiredService<NexusReader.Infrastructure.Persistence.AppDbContext>();
+    var dbContextFactory = services.GetRequiredService<IDbContextFactory<NexusReader.Infrastructure.Persistence.AppDbContext>>();
+    using var dbContext = await dbContextFactory.CreateDbContextAsync();
     
     int maxRetries = 5;
     int delayMs = 2000;