ReC/src/ReC.API/Program.cs

using Microsoft.AspNetCore.Rewrite;
using Microsoft.EntityFrameworkCore;
using ReC.API.Middleware;
using ReC.Application;
using ReC.Infrastructure;
using Serilog;
using Serilog.Ui.Core.Extensions;
using Serilog.Ui.SqliteDataProvider.Extensions;
using Serilog.Ui.Web.Extensions;
using System.Reflection;
using LogLevel = Microsoft.Extensions.Logging.LogLevel;

// Enable Serilog self-diagnostics
Serilog.Debugging.SelfLog.Enable(msg => Console.WriteLine($"[SERILOG] {msg}"));

// Build temporary configuration to read log directory from appsettings.Logging.json
var tempConfig = new ConfigurationBuilder()
    .SetBasePath(Directory.GetCurrentDirectory())
    .AddJsonFile("appsettings.json", optional: false)
    .AddJsonFile("appsettings.Logging.json", optional: false)
    .AddEnvironmentVariables()
    .Build();

var isDevelopment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") == "Development";

var logDirectory = tempConfig.GetValue<string>("Serilog:LogDirectory")
    ?? Path.Combine(AppContext.BaseDirectory, "logs");
var retainedFileCountLimit = tempConfig.GetValue("Serilog:RetainedFileCountLimit", 30);

Directory.CreateDirectory(logDirectory);

var sqliteDbPath = Path.Combine(logDirectory, "logs.db");
var logFilePathTemplate = Path.Combine(logDirectory, ".Rec.API-.log");

Console.WriteLine($"[INFO] Log Directory: {logDirectory}");

// Configure Serilog based on environment:
//   Development : Console + SQLite (+ Web UI)
//   Production  : File (per-level) + SQLite (+ Web UI)
var loggerConfig = new LoggerConfiguration()
    .MinimumLevel.Information()
    .MinimumLevel.Override("Microsoft.AspNetCore", Serilog.Events.LogEventLevel.Warning)
    .MinimumLevel.Override("Microsoft.EntityFrameworkCore", Serilog.Events.LogEventLevel.Warning)
    .Enrich.FromLogContext();

if (isDevelopment)
{
    loggerConfig.WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}");
}
else
{
    loggerConfig
        .WriteTo.File(
            Path.Combine(logDirectory, ".Rec.API-Info.log"),
            rollingInterval: RollingInterval.Day,
            retainedFileCountLimit: retainedFileCountLimit,
            restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Information,
            outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
        .WriteTo.File(
            Path.Combine(logDirectory, ".Rec.API-Warning.log"),
            rollingInterval: RollingInterval.Day,
            retainedFileCountLimit: retainedFileCountLimit,
            restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Warning,
            outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
        .WriteTo.File(
            Path.Combine(logDirectory, ".Rec.API-Error.log"),
            rollingInterval: RollingInterval.Day,
            retainedFileCountLimit: retainedFileCountLimit,
            restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Error,
            outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
        .WriteTo.File(
            Path.Combine(logDirectory, ".Rec.API-Critical.log"),
            rollingInterval: RollingInterval.Day,
            retainedFileCountLimit: retainedFileCountLimit,
            restrictedToMinimumLevel: Serilog.Events.LogEventLevel.Fatal,
            outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}");
}

// SQLite sink is always active (used by Serilog Web UI)
loggerConfig.WriteTo.SQLite(sqliteDbPath, storeTimestampInUtc: true);

Log.Logger = loggerConfig.CreateLogger();

Log.Information("Logging initialized!");

try
{
    Log.Information("Starting ReC.API application");

    var builder = WebApplication.CreateBuilder(args);

    // Use Serilog for logging
    builder.Host.UseSerilog();

    var config = builder.Configuration;

    Directory
        .GetFiles(builder.Environment.ContentRootPath, "appsettings.*.json", SearchOption.TopDirectoryOnly)
        .Where(file => Path.GetFileName(file) != $"appsettings.Development.json")
        .Where(file => Path.GetFileName(file) != $"appsettings.migration.json")
        .ToList()
        .ForEach(file => config.AddJsonFile(file, true, true));

    // Add services to the container.
    builder.Services.AddRecServices(options =>
    {
        options.LuckyPennySoftwareLicenseKey = builder.Configuration["LuckyPennySoftwareLicenseKey"];
        options.ConfigureRecActions(config.GetSection("RecAction"));
        options.ConfigureSqlException(config.GetSection("SqlException"));
    });

    builder.Services.AddRecInfrastructure(options =>
    {
        options.ConfigureDbContext((provider, opt) =>
        {
            var cnnStr = builder.Configuration.GetConnectionString("Default")
                                   ?? throw new InvalidOperationException("Connection string is not found.");

            var logger = provider.GetRequiredService<ILogger<RecDbContext>>();
            var enableSensitiveDataLogging = config.GetValue("EfCore:EnableSensitiveDataLogging", true);
            var enableDetailedErrors = config.GetValue("EfCore:EnableDetailedErrors", false);

            opt.UseSqlServer(cnnStr)
                    .LogTo(log => logger.LogInformation("{log}", log), LogLevel.Trace)
                    .EnableSensitiveDataLogging(enableSensitiveDataLogging)
                    .EnableDetailedErrors(enableDetailedErrors);
        });
    });

    builder.Services.AddControllers(options =>
    {
        options.Filters.Add<AuthScopedFilter>();
    });
    // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
    builder.Services.AddEndpointsApiExplorer();
    builder.Services.AddSwaggerGen(c =>
    {
        var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
        var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
        c.IncludeXmlComments(xmlPath);
    });

    // Serilog Web UI — SQLite provider, same path used by the SQLite sink above
    builder.Services.AddSerilogUi(logUIOpt =>
    {
        logUIOpt.UseSqliteServer(dbOpt =>
        {
            dbOpt.WithConnectionString($"Data Source={sqliteDbPath}");
            dbOpt.WithTable("Logs");
        });
    });

    var app = builder.Build();

    app.UseMiddleware<ExceptionHandlingMiddleware>();

    // Configure the HTTP request pipeline.
    if (app.Environment.IsDevelopment() || config.GetValue<bool>("UseSwagger"))
    {
        app.UseSwagger();
        app.UseSwaggerUI();

        var rewriteOptions = new RewriteOptions().AddRedirect("^$", "swagger");
        app.UseRewriter(rewriteOptions);
    }

    app.UseHttpsRedirection();

    app.UseAuthorization();

    // Serilog Web UI is always active (both Development and Production)
    app.UseSerilogUi();

    app.MapControllers();

    app.Run();
}
catch (Exception ex)
{
    Log.Fatal(ex, "Stopped program because of exception");
    throw;
}
finally
{
    Log.CloseAndFlush();
}

public partial class Program;