Fix: Import concurrency errors + Add sales data cleanup

- Fix optimistic concurrency errors in product import by using ExecuteSqlRaw instead of EF tracking
- Add DeleteAllOrdersAndSalesDataAsync() method to clear orders, payments, customers, and messages
- Add DeleteAllSalesData endpoint to ProductsController for admin access
- Proper deletion order to avoid foreign key violations
- Enhanced logging for troubleshooting data cleanup operations

Resolves: Import errors with 'database operation expected to affect 1 row(s)'

LittleShop/Areas/Admin/Controllers/ProductsController.cs

@@ -306,4 +306,21 @@ public class ProductsController : Controller
         }
         return Json(collection);
     }
+
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public async Task<IActionResult> DeleteAllSalesData()
+    {
+        try
+        {
+            var deletedCount = await _importService.DeleteAllOrdersAndSalesDataAsync();
+            TempData["SuccessMessage"] = $"✅ Successfully deleted {deletedCount} sales records (orders, payments, customers, messages)";
+            return RedirectToAction(nameof(Index));
+        }
+        catch (Exception ex)
+        {
+            TempData["ErrorMessage"] = $"Failed to delete sales data: {ex.Message}";
+            return RedirectToAction(nameof(Index));
+        }
+    }
 }

LittleShop/Services/ProductImportService.cs

@@ -14,6 +14,7 @@ public interface IProductImportService
     Task<ProductImportResultDto> ImportFromTextAsync(string csvText, bool replaceAll = false);
     Task<ProductImportResultDto> ImportFromHumanTextAsync(string textContent, bool replaceAll = false);
     Task<int> DeleteAllProductsAndCategoriesAsync();
+    Task<int> DeleteAllOrdersAndSalesDataAsync();
     string GenerateTemplateAsCsv();
     string GenerateTemplateAsHumanText();
     Task<string> ExportProductsAsCsvAsync();
@@ -731,33 +732,113 @@ stock: 75
     {
         var deletedCount = 0;
 
-        // Delete all product photos
-        var photos = await _context.ProductPhotos.ToListAsync();
-        _context.ProductPhotos.RemoveRange(photos);
-        deletedCount += photos.Count;
+        try
+        {
+            // Use ExecuteSqlRaw to avoid EF tracking issues and optimistic concurrency errors
+            // Order matters: delete child records first, then parents
 
-        // Delete all product variants
-        var variants = await _context.ProductVariants.ToListAsync();
-        _context.ProductVariants.RemoveRange(variants);
-        deletedCount += variants.Count;
+            // Delete order items (references products)
+            var orderItemsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM OrderItems");
+            deletedCount += orderItemsDeleted;
+            _logger.LogInformation("Deleted {Count} order items", orderItemsDeleted);
 
-        // Delete all product multi-buys
-        var multiBuys = await _context.ProductMultiBuys.ToListAsync();
-        _context.ProductMultiBuys.RemoveRange(multiBuys);
-        deletedCount += multiBuys.Count;
+            // Delete product photos
+            var photosDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM ProductPhotos");
+            deletedCount += photosDeleted;
+            _logger.LogInformation("Deleted {Count} product photos", photosDeleted);
 
-        // Delete all products
-        var products = await _context.Products.ToListAsync();
-        _context.Products.RemoveRange(products);
-        deletedCount += products.Count;
+            // Delete product variants
+            var variantsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM ProductVariants");
+            deletedCount += variantsDeleted;
+            _logger.LogInformation("Deleted {Count} product variants", variantsDeleted);
 
-        // Delete all categories
-        var categories = await _context.Categories.ToListAsync();
-        _context.Categories.RemoveRange(categories);
-        deletedCount += categories.Count;
+            // Delete product multi-buys
+            var multiBuysDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM ProductMultiBuys");
+            deletedCount += multiBuysDeleted;
+            _logger.LogInformation("Deleted {Count} product multi-buys", multiBuysDeleted);
 
-        await _context.SaveChangesAsync();
+            // Delete products
+            var productsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM Products");
+            deletedCount += productsDeleted;
+            _logger.LogInformation("Deleted {Count} products", productsDeleted);
 
+            // Delete categories
+            var categoriesDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM Categories");
+            deletedCount += categoriesDeleted;
+            _logger.LogInformation("Deleted {Count} categories", categoriesDeleted);
+
+            _logger.LogInformation("Successfully deleted {TotalCount} total records", deletedCount);
             return deletedCount;
         }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to delete products and categories");
+            throw new InvalidOperationException($"Failed to delete data: {ex.Message}", ex);
+        }
+    }
+
+    public async Task<int> DeleteAllOrdersAndSalesDataAsync()
+    {
+        var deletedCount = 0;
+
+        try
+        {
+            _logger.LogWarning("DELETING ALL ORDERS AND SALES DATA - This action is irreversible");
+
+            // Delete in proper order (child tables first)
+
+            // Delete customer messages (references customers and orders)
+            var messagesDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM CustomerMessages");
+            deletedCount += messagesDeleted;
+            _logger.LogInformation("Deleted {Count} customer messages", messagesDeleted);
+
+            // Delete crypto payments (references orders)
+            var paymentsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM CryptoPayments");
+            deletedCount += paymentsDeleted;
+            _logger.LogInformation("Deleted {Count} crypto payments", paymentsDeleted);
+
+            // Delete order items (references orders and products)
+            var orderItemsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM OrderItems");
+            deletedCount += orderItemsDeleted;
+            _logger.LogInformation("Deleted {Count} order items", orderItemsDeleted);
+
+            // Delete orders (parent table)
+            var ordersDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM Orders");
+            deletedCount += ordersDeleted;
+            _logger.LogInformation("Deleted {Count} orders", ordersDeleted);
+
+            // Delete reviews (sales feedback data)
+            var reviewsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM Reviews");
+            deletedCount += reviewsDeleted;
+            _logger.LogInformation("Deleted {Count} reviews", reviewsDeleted);
+
+            // Delete push subscriptions (user notification data)
+            var subscriptionsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM PushSubscriptions");
+            deletedCount += subscriptionsDeleted;
+            _logger.LogInformation("Deleted {Count} push subscriptions", subscriptionsDeleted);
+
+            // Delete bot contacts (telegram bot interaction data)
+            var contactsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM BotContacts");
+            deletedCount += contactsDeleted;
+            _logger.LogInformation("Deleted {Count} bot contacts", contactsDeleted);
+
+            // Delete bot metrics (analytics data)
+            var metricsDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM BotMetrics");
+            deletedCount += metricsDeleted;
+            _logger.LogInformation("Deleted {Count} bot metrics", metricsDeleted);
+
+            // Delete customers (will cascade any remaining references)
+            var customersDeleted = await _context.Database.ExecuteSqlRawAsync("DELETE FROM Customers");
+            deletedCount += customersDeleted;
+            _logger.LogInformation("Deleted {Count} customers", customersDeleted);
+
+            _logger.LogInformation("✅ Successfully deleted {TotalCount} total sales records", deletedCount);
+            return deletedCount;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to delete orders and sales data");
+            throw new InvalidOperationException($"Failed to delete sales data: {ex.Message}", ex);
+        }
+    }
 }