creating endpoint WareHouseProduct

PyroFetes/Endpoints/WareHouseProduct/PatchWareHouseProductQuantityEndpoint.cs

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+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using PyroFetes.DTO.QuotationProduct.Request;
+using PyroFetes.DTO.QuotationProduct.Response;
+using PyroFetes.DTO.WareHouseProduct.Request;
+using PyroFetes.DTO.WareHouseProduct.Response;
+
+namespace PyroFetes.Endpoints.WareHouseProduct;
+
+public class PatchWareHouseProductQuantityEndpoint(PyroFetesDbContext database) : Endpoint<PatchWareHouseProductQuantityDto, GetWareHouseProductDto>
+{
+    public override void Configure()
+    {
+        Patch("/api/wareHouseProduct/{ProductId}/{WareHouseId}/Quantity", x => new { x.ProductId, x.WareHouseId });
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(PatchWareHouseProductQuantityDto req, CancellationToken ct)
+    {
+        var wareHouseProduct = await database.WarehouseProducts.SingleOrDefaultAsync(wp => wp.ProductId == req.ProductId && wp.WarehouseId == req.WareHouseId, ct);
+        if (wareHouseProduct == null)
+        {
+            await Send.NotFoundAsync(ct);
+            return;
+        }
+        
+        wareHouseProduct.Quantity = req.Quantity;
+        await database.SaveChangesAsync(ct);
+
+        GetWareHouseProductDto responseDto = new()
+        {
+            ProductId = wareHouseProduct.ProductId,
+            WareHouseId = wareHouseProduct.WarehouseId,
+            Quantity = wareHouseProduct.Quantity
+        };
+        await Send.OkAsync(responseDto, ct);
+    }
+}