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using Microsoft.AspNetCore.Identity.EntityFrameworkCore; // 追記
using Microsoft.EntityFrameworkCore;                     // 追記

namespace T8b.Data
{
    public class T8bIdentityContext : IdentityDbContext
    {
        public T8bIdentityContext(DbContextOptions<T8bIdentityContext> contextOptions)
            : base(contextOptions)
        { }
    }
}

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using KnzwTech.AspNetCore.ResourceBasedLocalization;
using Microsoft.AspNetCore.Identity; // 追加
using Microsoft.EntityFrameworkCore;
using T8b.Data;

AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews(opt => opt.EnableDefaultErrorMessagesFromResource());

builder.Services.AddDbContext<T8bContext>(opt
    => opt.UseNpgsql(builder.Configuration.GetConnectionString(nameof(T8bContext))));

// Identity 用のデータコンテキストを追加する．
builder.Services.AddDbContext<T8bIdentityContext>(
    opt => opt.UseNpgsql(builder.Configuration.GetConnectionString(nameof(T8bIdentityContext))));

// ASP.NET Core Identity のセットアップ
builder.Services.AddIdentity<IdentityUser, IdentityRole>()
    .AddRoleManager<RoleManager<IdentityRole>>()
    .AddDefaultTokenProviders()
    .AddEntityFrameworkStores<T8bIdentityContext>();

// 認証にCookieを使用するための設定
builder.Services.ConfigureApplicationCookie(opt => {
    opt.LoginPath = "/Admin/Login";
    opt.LogoutPath = "/Admin/Logout";
    opt.AccessDeniedPath = "/Admin/AccessDenied";
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();

app.UseStatusCodePagesWithReExecute("/Home/AccessError/{0}");

app.UseRouting();

app.UseAuthentication(); // 認証を有効化する
app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();

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{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ConnectionStrings": {
    "T8bContext": "Host=localhost;Port=5432;Username=t8b_user;Database=t8b_db;Password=bX89#TaNNH", // ←ここカンマを追記するの忘れないように！
    "T8bIdentityContext": "Host=localhost;Port=5432;Username=t8b_user;Database=t8b_db;Password=bX89#TaNNH"
  }
}