feat(wbs-ux): implement real-world CRUD templates and refactor QuantDataGrid to AG Grid

src/dotnet/QuantEngine.Web/Endpoints/UpdateFactorThresholdEndpoint.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using FastEndpoints;
+using Dapper;
+using Npgsql;
+using Microsoft.Extensions.Configuration;
+
+namespace QuantEngine.Web.Endpoints;
+
+public record UpdateThresholdRequest(string FactorId, string CalibrationState, string ThresholdParamsJson);
+public record UpdateThresholdResponse(bool Success, string Message);
+
+/// <summary>
+/// BFF FastEndpoints for updating factor threshold parameter logic.
+/// SOLID: Single Responsibility for updating factor settings.
+/// </summary>
+public class UpdateFactorThresholdEndpoint : Endpoint<UpdateThresholdRequest, UpdateThresholdResponse>
+{
+    private readonly string _connectionString;
+
+    public UpdateFactorThresholdEndpoint(IConfiguration config)
+    {
+        _connectionString = config.GetConnectionString("DefaultConnection") 
+            ?? throw new ArgumentNullException("ConnectionStrings__DefaultConnection");
+    }
+
+    public override void Configure()
+    {
+        Post("/api/admin/factors/update-threshold");
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(UpdateThresholdRequest req, CancellationToken ct)
+    {
+        using var conn = new NpgsqlConnection(_connectionString);
+        await conn.OpenAsync(ct);
+
+        const string sql = @"
+            UPDATE quantengine.factor_version_history 
+            SET calibration_state = @CalibrationState, 
+                threshold_params = @ThresholdParams::jsonb,
+                updated_at = NOW()
+            WHERE factor_id = @FactorId;";
+
+        int affectedRows = await conn.ExecuteAsync(sql, new {
+            req.FactorId,
+            req.CalibrationState,
+            ThresholdParams = req.ThresholdParamsJson
+        });
+
+        if (affectedRows > 0)
+        {
+            await SendAsync(new UpdateThresholdResponse(true, "성공적으로 반영되었습니다."), cancellation: ct);
+        }
+        else
+        {
+            await SendAsync(new UpdateThresholdResponse(false, "해당 Factor ID를 찾을 수 없습니다."), statusCode: 404, cancellation: ct);
+        }
+    }
+}