Memperbaiki logika alur sistem

database/recipes_schema.sql

@@ -42,6 +42,22 @@ CREATE TABLE IF NOT EXISTS products (
   KEY idx_category (category)
 );
 
+-- 4. TABLE: stock_usage_history
+-- Menyimpan riwayat pemakaian stok saat produksi
+CREATE TABLE IF NOT EXISTS stock_usage_history (
+  id INT PRIMARY KEY AUTO_INCREMENT,
+  recipe_name VARCHAR(100),
+  production_quantity INT,
+  product_id INT NOT NULL,
+  product_name VARCHAR(100) NOT NULL,
+  quantity_used FLOAT NOT NULL,
+  unit VARCHAR(20),
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (product_id) REFERENCES products(id) ON DELETE CASCADE,
+  KEY idx_product_id (product_id),
+  KEY idx_recipe_name (recipe_name)
+);
+
 -- =====================================================
 -- INSERT DATA: RESEP
 -- =====================================================

lib/screens/prediction/prediction_controller.dart

@@ -6,12 +6,13 @@ class PredictionController extends ChangeNotifier {
   int productionQuantity = 0;
   bool isCalculated = false;
   bool isLoading = true;
+  bool isSubmitting = false;
 
   List<Map<String, dynamic>> recipes = [];
   Map<String, Map<String, dynamic>> recipeIngredients = {};
   Map<String, bool> ingredientSelections = {};
 
-  final Map<String, int> currentStock = {
+  final Map<String, double> currentStock = {
     'Tepung Terigu 1kg': 45000,
     'Telur 1kg': 12,
     'Gula Pasir 1kg': 28000,
@@ -21,6 +22,10 @@ class PredictionController extends ChangeNotifier {
     'Keju Parut 250gr': 3000,
     'Baking Powder': 60000,
   };
+  final Map<String, int> productIds = {};
+  final Map<String, String> productUnits = {};
+
+  static const double eggGramPerButir = 50;
 
   Future<String?> loadRecipes() async {
     isLoading = true;
@@ -28,6 +33,7 @@ class PredictionController extends ChangeNotifier {
 
     try {
       final fetchedRecipes = await MLService.getRecipes();
+      final fetchedProducts = await MLService.getProducts();
       recipes = fetchedRecipes;
       recipeIngredients = {};
 
@@ -47,6 +53,7 @@ class PredictionController extends ChangeNotifier {
         }
       }
 
+      _applyProductStocks(fetchedProducts);
       _initializeIngredientSelections();
 
       return null;
@@ -58,6 +65,44 @@ class PredictionController extends ChangeNotifier {
     }
   }
 
+  Future<void> refreshStock() async {
+    try {
+      final fetchedProducts = await MLService.getProducts();
+      _applyProductStocks(fetchedProducts);
+    } catch (_) {
+      // Ignore refresh errors; keep existing stock
+    } finally {
+      notifyListeners();
+    }
+  }
+
+  void _applyProductStocks(List<Map<String, dynamic>> products) {
+    if (products.isEmpty) return;
+
+    currentStock.clear();
+    productIds.clear();
+    productUnits.clear();
+
+    for (final product in products) {
+      final name =
+          (product['name'] ?? product['product_name'] ?? '').toString();
+      if (name.isEmpty) continue;
+
+      final id = product['id'] ?? 0;
+      final unit = (product['unit'] ?? '').toString();
+      final stockRaw = product['current_stock'] ?? 0;
+      final stock = stockRaw is num ? stockRaw.toDouble() : 0.0;
+
+      currentStock[name] = stock;
+      if (id is int) {
+        productIds[name] = id;
+      }
+      if (unit.isNotEmpty) {
+        productUnits[name] = unit;
+      }
+    }
+  }
+
   void setSelectedRecipe(String? value) {
     selectedRecipe = value;
     isCalculated = false;
@@ -107,31 +152,36 @@ class PredictionController extends ChangeNotifier {
     };
   }
 
-  Map<String, int> get requiredIngredients {
+  Map<String, double> get requiredIngredients {
     if (selectedRecipe == null || productionQuantity == 0) {
       return {};
     }
 
     final ingredients = recipeIngredients[selectedRecipe] ?? {};
-    final required = <String, int>{};
+    final required = <String, double>{};
 
     ingredients.forEach((productName, details) {
       if (!isIngredientSelected(productName)) return;
-      final quantity = (details['quantity'] as num).toInt();
+      final quantity = (details['quantity'] as num).toDouble();
       required[productName] = quantity * productionQuantity;
     });
 
     return required;
   }
 
-  Map<String, int> get insufficientStock {
+  Map<String, double> get insufficientStock {
     final required = requiredIngredients;
-    final insufficient = <String, int>{};
+    final insufficient = <String, double>{};
 
     required.forEach((ingredient, neededAmount) {
+      final requiredInStockUnit = _convertToStockUnit(
+        ingredient: ingredient,
+        amount: neededAmount,
+        fromUnit: getIngredientUnit(ingredient),
+      );
       final available = currentStock[ingredient] ?? 0;
-      if (available < neededAmount) {
+      if (available < requiredInStockUnit) {
-        insufficient[ingredient] = neededAmount - available;
+        insufficient[ingredient] = requiredInStockUnit - available;
       }
     });
 
@@ -149,8 +199,27 @@ class PredictionController extends ChangeNotifier {
     return ingData['unit'] as String? ?? 'gr';
   }
 
-  Color getStatusColor(String ingredient) {
+  String getStockUnit(String ingredient) {
+    final unit = productUnits[ingredient];
+    if (unit != null && unit.isNotEmpty) return unit;
+    return getIngredientUnit(ingredient);
+  }
+
+  double getRequiredInStockUnit(String ingredient) {
     final required = requiredIngredients[ingredient] ?? 0;
+    return _convertToStockUnit(
+      ingredient: ingredient,
+      amount: required,
+      fromUnit: getIngredientUnit(ingredient),
+    );
+  }
+
+  Color getStatusColor(String ingredient) {
+    final required = _convertToStockUnit(
+      ingredient: ingredient,
+      amount: requiredIngredients[ingredient] ?? 0,
+      fromUnit: getIngredientUnit(ingredient),
+    );
     final available = currentStock[ingredient] ?? 0;
     return available >= required
         ? const Color(0xFF10B981)
@@ -160,4 +229,144 @@ class PredictionController extends ChangeNotifier {
   String cleanIngredientName(String ingredient) {
     return ingredient.replaceAll(RegExp(r' \d+(kg|gr)'), '').trim();
   }
+
+  String formatQuantity(double value) {
+    if (value % 1 == 0) {
+      return value.toInt().toString();
+    }
+    return value
+        .toStringAsFixed(2)
+        .replaceAll(RegExp(r'0+$'), '')
+        .replaceAll(RegExp(r'\.$'), '');
+  }
+
+  double _convertToStockUnit({
+    required String ingredient,
+    required double amount,
+    required String fromUnit,
+  }) {
+    final stockUnit = getStockUnit(ingredient).toLowerCase();
+    final unit = fromUnit.toLowerCase();
+
+    if (unit == stockUnit) return amount;
+
+    if (unit == 'gr' && stockUnit == 'kg') return amount / 1000;
+    if (unit == 'kg' && stockUnit == 'gr') return amount * 1000;
+
+    if (unit == 'butir' && stockUnit == 'kg') {
+      return (amount * eggGramPerButir) / 1000;
+    }
+    if (unit == 'butir' && stockUnit == 'gr') {
+      return amount * eggGramPerButir;
+    }
+    if (unit == 'kg' && stockUnit == 'butir') {
+      return (amount * 1000) / eggGramPerButir;
+    }
+    if (unit == 'gr' && stockUnit == 'butir') {
+      return amount / eggGramPerButir;
+    }
+
+    return amount;
+  }
+
+  double _applyRoundingForStock(double amountInStockUnit, String stockUnit) {
+    final unit = stockUnit.toLowerCase();
+    if (unit != 'kg' && unit != 'gr') return amountInStockUnit;
+
+    final grams = unit == 'kg' ? amountInStockUnit * 1000 : amountInStockUnit;
+    if (grams <= 0) return 0;
+
+    double roundedKg;
+    if (grams < 500) {
+      roundedKg = 0.5;
+    } else if (grams <= 1000) {
+      roundedKg = 1.0;
+    } else {
+      roundedKg = (grams / 1000).ceilToDouble();
+    }
+
+    return unit == 'kg' ? roundedKg : roundedKg * 1000;
+  }
+
+  Map<String, double> get roundedUsage {
+    final required = requiredIngredients;
+    final rounded = <String, double>{};
+
+    required.forEach((ingredient, neededAmount) {
+      if (!isIngredientSelected(ingredient)) return;
+      final stockUnit = getStockUnit(ingredient);
+      final requiredInStockUnit = _convertToStockUnit(
+        ingredient: ingredient,
+        amount: neededAmount,
+        fromUnit: getIngredientUnit(ingredient),
+      );
+      rounded[ingredient] = _applyRoundingForStock(
+        requiredInStockUnit,
+        stockUnit,
+      );
+    });
+
+    return rounded;
+  }
+
+  Future<Map<String, dynamic>> submitProduction() async {
+    if (selectedRecipe == null || !isCalculated) {
+      return {'status': 'error', 'message': 'Hitung kebutuhan terlebih dahulu'};
+    }
+
+    await refreshStock();
+    if (insufficientStock.isNotEmpty) {
+      return {
+        'status': 'error',
+        'message': 'Stok masih kurang, silakan update stok dulu',
+      };
+    }
+
+    final rounded = roundedUsage;
+    if (rounded.isEmpty) {
+      return {'status': 'error', 'message': 'Tidak ada bahan yang dipilih'};
+    }
+
+    isSubmitting = true;
+    notifyListeners();
+
+    try {
+      final items =
+          rounded.entries.map((entry) {
+            final ingredient = entry.key;
+            final quantity = entry.value;
+            return {
+              'product_id': productIds[ingredient],
+              'product_name': ingredient,
+              'quantity': quantity,
+              'unit': getStockUnit(ingredient),
+            };
+          }).toList();
+
+      final result = await MLService.consumeStock(
+        items: items,
+        recipeName: selectedRecipe,
+        productionQuantity: productionQuantity,
+      );
+
+      if (result['status'] == 'success') {
+        for (final entry in rounded.entries) {
+          final ingredient = entry.key;
+          final quantity = entry.value;
+          final available = currentStock[ingredient] ?? 0;
+          currentStock[ingredient] = (available - quantity).clamp(
+            0,
+            double.infinity,
+          );
+        }
+      }
+
+      return result;
+    } catch (e) {
+      return {'status': 'error', 'message': 'Gagal submit: $e'};
+    } finally {
+      isSubmitting = false;
+      notifyListeners();
+    }
+  }
 }

lib/screens/prediction/prediction_page.dart

@@ -26,6 +26,21 @@ class _PredictionScreenState extends State<PredictionScreen> {
     ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(error)));
   }
 
+  Future<void> _submitProduction() async {
+    final result = await _controller.submitProduction();
+    if (!mounted) return;
+
+    if (result['status'] == 'success') {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('✅ Stok berhasil diperbarui')),
+      );
+    } else {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(result['message'] ?? 'Gagal submit')),
+      );
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return AnimatedBuilder(
@@ -368,7 +383,11 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                           child: ElevatedButton.icon(
                                             onPressed:
                                                 _controller.canCalculate
-                                                    ? _controller.calculate
+                                                    ? () async {
+                                                      await _controller
+                                                          .refreshStock();
+                                                      _controller.calculate();
+                                                    }
                                                     : null,
                                             icon: const Icon(
                                               Icons.calculate,
@@ -587,21 +606,29 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                                 _controller.getIngredientUnit(
                                                   ingredient,
                                                 );
+                                            final stockUnit = _controller
+                                                .getStockUnit(ingredient);
                                             final quantityPerUnit =
                                                 (details['quantity'] as num)
-                                                    .toInt();
+                                                    .toDouble();
                                             final neededAmount =
                                                 isSelected
                                                     ? quantityPerUnit *
                                                         _controller
                                                             .productionQuantity
-                                                    : 0;
+                                                    : 0.0;
                                             final availableAmount =
                                                 _controller
                                                     .currentStock[ingredient] ??
-                                                0;
+                                                0.0;
+                                            final requiredInStockUnit =
+                                                _controller
+                                                    .getRequiredInStockUnit(
+                                                      ingredient,
+                                                    );
                                             final isSufficient =
-                                                availableAmount >= neededAmount;
+                                                availableAmount >=
+                                                requiredInStockUnit;
                                             final statusColor =
                                                 isSelected
                                                     ? (isSufficient
@@ -693,7 +720,7 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                                                             ),
                                                                           ),
                                                                           Text(
-                                                                            '$neededAmount $unit',
+                                                                            '${_controller.formatQuantity(neededAmount)} $unit',
                                                                             style: const TextStyle(
                                                                               fontSize:
                                                                                   12,
@@ -723,7 +750,7 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                                                             ),
                                                                           ),
                                                                           Text(
-                                                                            '$availableAmount $unit',
+                                                                            '${_controller.formatQuantity(availableAmount)} $stockUnit',
                                                                             style: const TextStyle(
                                                                               fontSize:
                                                                                   12,
@@ -799,6 +826,128 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                     ),
                                   ),
                                 const SizedBox(height: 16),
+                                if (_controller.roundedUsage.isNotEmpty) ...[
+                                  const Text(
+                                    'Ringkasan Pengurangan Stok',
+                                    style: TextStyle(
+                                      fontSize: 14,
+                                      fontWeight: FontWeight.w700,
+                                      color: Color(0xFF1F2937),
+                                    ),
+                                  ),
+                                  const SizedBox(height: 12),
+                                  Container(
+                                    padding: const EdgeInsets.all(16),
+                                    decoration: BoxDecoration(
+                                      color: Colors.white,
+                                      borderRadius: BorderRadius.circular(12),
+                                      boxShadow: [
+                                        BoxShadow(
+                                          color: Colors.black.withOpacity(0.05),
+                                          blurRadius: 10,
+                                          offset: const Offset(0, 2),
+                                        ),
+                                      ],
+                                    ),
+                                    child: Column(
+                                      children:
+                                          _controller.roundedUsage.entries.map((
+                                            entry,
+                                          ) {
+                                            final ingredient = entry.key;
+                                            final amount = entry.value;
+                                            final stockUnit = _controller
+                                                .getStockUnit(ingredient);
+                                            return Padding(
+                                              padding:
+                                                  const EdgeInsets.symmetric(
+                                                    vertical: 6,
+                                                  ),
+                                              child: Row(
+                                                mainAxisAlignment:
+                                                    MainAxisAlignment
+                                                        .spaceBetween,
+                                                children: [
+                                                  Expanded(
+                                                    child: Text(
+                                                      _controller
+                                                          .cleanIngredientName(
+                                                            ingredient,
+                                                          ),
+                                                      style: const TextStyle(
+                                                        fontSize: 12,
+                                                        fontWeight:
+                                                            FontWeight.w600,
+                                                        color: Color(
+                                                          0xFF1F2937,
+                                                        ),
+                                                      ),
+                                                    ),
+                                                  ),
+                                                  Text(
+                                                    '-${_controller.formatQuantity(amount)} $stockUnit',
+                                                    style: const TextStyle(
+                                                      fontSize: 12,
+                                                      fontWeight:
+                                                          FontWeight.w700,
+                                                      color: Color(0xFFDC2626),
+                                                    ),
+                                                  ),
+                                                ],
+                                              ),
+                                            );
+                                          }).toList(),
+                                    ),
+                                  ),
+                                  const SizedBox(height: 16),
+                                  SizedBox(
+                                    width: double.infinity,
+                                    child: ElevatedButton.icon(
+                                      onPressed:
+                                          _controller.isSubmitting
+                                              ? null
+                                              : _submitProduction,
+                                      icon:
+                                          _controller.isSubmitting
+                                              ? const SizedBox(
+                                                width: 18,
+                                                height: 18,
+                                                child: CircularProgressIndicator(
+                                                  strokeWidth: 2,
+                                                  valueColor:
+                                                      AlwaysStoppedAnimation<
+                                                        Color
+                                                      >(Colors.white),
+                                                ),
+                                              )
+                                              : const Icon(Icons.check_circle),
+                                      label: Text(
+                                        _controller.isSubmitting
+                                            ? 'Memproses...'
+                                            : 'Submit Produksi',
+                                        style: const TextStyle(
+                                          fontSize: 13,
+                                          fontWeight: FontWeight.w600,
+                                        ),
+                                      ),
+                                      style: ElevatedButton.styleFrom(
+                                        backgroundColor: const Color(
+                                          0xFF10B981,
+                                        ),
+                                        foregroundColor: Colors.white,
+                                        padding: const EdgeInsets.symmetric(
+                                          vertical: 12,
+                                        ),
+                                        shape: RoundedRectangleBorder(
+                                          borderRadius: BorderRadius.circular(
+                                            10,
+                                          ),
+                                        ),
+                                      ),
+                                    ),
+                                  ),
+                                  const SizedBox(height: 16),
+                                ],
                                 if (!_controller.isStockSufficient) ...[
                                   const Text(
                                     'Rekomendasi Penambahan Stok',
@@ -833,7 +982,7 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                             final ingredient = entry.key;
                                             final deficitAmount = entry.value;
                                             final unit = _controller
-                                                .getIngredientUnit(ingredient);
+                                                .getStockUnit(ingredient);
 
                                             return Padding(
                                               padding:
@@ -877,7 +1026,7 @@ class _PredictionScreenState extends State<PredictionScreen> {
                                                           ),
                                                     ),
                                                     child: Text(
-                                                      '+$deficitAmount $unit',
+                                                      '+${_controller.formatQuantity(deficitAmount)} $unit',
                                                       style: const TextStyle(
                                                         fontSize: 12,
                                                         fontWeight:

lib/services/ml_service.dart

@@ -189,6 +189,42 @@ class MLService {
   // DATABASE ENDPOINTS - PRODUCTS & TRANSACTIONS
   // ========================================================================
 
+  /// Consume stock (batch) after production
+  static Future<Map<String, dynamic>> consumeStock({
+    required List<Map<String, dynamic>> items,
+    String? recipeName,
+    int? productionQuantity,
+  }) async {
+    try {
+      final data = {
+        'items': items,
+        if (recipeName != null) 'recipe_name': recipeName,
+        if (productionQuantity != null)
+          'production_quantity': productionQuantity,
+      };
+
+      final response = await http
+          .post(
+            Uri.parse('$baseUrl/stock/consume'),
+            headers: {'Content-Type': 'application/json'},
+            body: jsonEncode(data),
+          )
+          .timeout(Duration(seconds: timeoutSeconds));
+
+      if (response.statusCode == 200) {
+        return jsonDecode(response.body);
+      } else {
+        return {
+          'status': 'error',
+          'message': 'Server error: ${response.statusCode}',
+        };
+      }
+    } catch (e) {
+      print('Consume stock error: $e');
+      return {'status': 'error', 'message': 'Connection error: $e'};
+    }
+  }
+
   /// Get all products from database
   static Future<List<Map<String, dynamic>>> getProducts() async {
     try {

ml_model/app.py

@@ -42,6 +42,23 @@ def get_db_connection():
         logger.error(f"Database connection error: {e}")
         return None
 
+def table_exists(connection, table_name: str) -> bool:
+    try:
+        cursor = connection.cursor()
+        cursor.execute("SHOW TABLES LIKE %s", (table_name,))
+        exists = cursor.fetchone() is not None
+        cursor.close()
+        return exists
+    except Error:
+        return False
+
+def get_product_name_column(connection) -> str:
+    cursor = connection.cursor()
+    cursor.execute("SHOW COLUMNS FROM products LIKE 'name'")
+    has_name = cursor.fetchone() is not None
+    cursor.close()
+    return 'name' if has_name else 'product_name'
+
 # ============================================================================
 # LOAD MODELS AT STARTUP
 # ============================================================================
@@ -238,7 +255,8 @@ def info():
             'GET /products': 'Get all products',
             'POST /transactions': 'Save transaction (legacy)',
             'GET /transactions': 'Get transaction history',
-            'POST /transaksi': 'Save transaction and update stock automatically'
+            'POST /transaksi': 'Save transaction and update stock automatically',
+            'POST /stock/consume': 'Consume stock after production'
         },
         'required_features': feature_columns
     }), 200
@@ -418,6 +436,147 @@ def create_product():
         return jsonify({'status': 'error', 'message': str(e)}), 500
 
 
+@app.route('/stock/consume', methods=['POST'])
+def consume_stock():
+    """
+    Consume stock after production.
+    Body: {
+        "recipe_name": "Donat",
+        "production_quantity": 10,
+        "items": [
+            {"product_id": 1, "product_name": "Tepung Terigu 1kg", "quantity": 1, "unit": "kg"}
+        ],
+        "allow_partial": false
+    }
+    """
+    try:
+        data = request.json or {}
+        items = data.get('items', [])
+        allow_partial = bool(data.get('allow_partial', False))
+
+        if not isinstance(items, list) or not items:
+            return jsonify({
+                'status': 'error',
+                'message': 'Items wajib diisi'
+            }), 400
+
+        connection = get_db_connection()
+        if not connection:
+            return jsonify({'status': 'error', 'message': 'Database connection failed'}), 500
+
+        name_column = get_product_name_column(connection)
+        history_enabled = table_exists(connection, 'stock_usage_history')
+
+        cursor = connection.cursor(dictionary=True)
+        connection.start_transaction()
+
+        errors = []
+        valid_items = []
+
+        for item in items:
+            product_id = item.get('product_id')
+            product_name = item.get('product_name')
+            quantity = item.get('quantity')
+
+            if not isinstance(quantity, (int, float)) or quantity <= 0:
+                errors.append({
+                    'item': item,
+                    'message': 'Quantity harus lebih dari 0'
+                })
+                continue
+
+            if product_id:
+                cursor.execute(
+                    f"SELECT id, {name_column} as name, current_stock, unit FROM products WHERE id = %s",
+                    (product_id,)
+                )
+            else:
+                cursor.execute(
+                    f"SELECT id, {name_column} as name, current_stock, unit FROM products WHERE {name_column} = %s",
+                    (product_name,)
+                )
+
+            product = cursor.fetchone()
+            if not product:
+                errors.append({
+                    'item': item,
+                    'message': 'Produk tidak ditemukan'
+                })
+                continue
+
+            if product['current_stock'] < quantity:
+                errors.append({
+                    'item': item,
+                    'message': 'Stok tidak cukup',
+                    'available': product['current_stock']
+                })
+                continue
+
+            valid_items.append({
+                'product': product,
+                'quantity': quantity,
+                'unit': item.get('unit') or product.get('unit'),
+            })
+
+        if errors and not allow_partial:
+            connection.rollback()
+            cursor.close()
+            connection.close()
+            return jsonify({
+                'status': 'error',
+                'message': 'Ada item gagal diproses',
+                'errors': errors
+            }), 400
+
+        results = []
+        for entry in valid_items:
+            product = entry['product']
+            quantity = entry['quantity']
+            cursor.execute(
+                "UPDATE products SET current_stock = current_stock - %s WHERE id = %s",
+                (quantity, product['id'])
+            )
+
+            if history_enabled:
+                cursor.execute(
+                    """
+                    INSERT INTO stock_usage_history
+                    (recipe_name, production_quantity, product_id, product_name, quantity_used, unit)
+                    VALUES (%s, %s, %s, %s, %s, %s)
+                    """,
+                    (
+                        data.get('recipe_name'),
+                        data.get('production_quantity'),
+                        product['id'],
+                        product['name'],
+                        quantity,
+                        entry['unit']
+                    )
+                )
+
+            results.append({
+                'product_id': product['id'],
+                'product_name': product['name'],
+                'quantity_used': quantity,
+                'unit': entry['unit']
+            })
+
+        connection.commit()
+        cursor.close()
+        connection.close()
+
+        return jsonify({
+            'status': 'success',
+            'processed': len(results),
+            'results': results,
+            'errors': errors if allow_partial else []
+        }), 200
+
+    except Exception as e:
+        logger.error(f"Consume stock error: {str(e)}")
+        return jsonify({'status': 'error', 'message': str(e)}), 500
+
+
 @app.route('/transactions', methods=['POST'])
 def save_transaction():
     """

ml_model/setup_database.sql

@@ -30,6 +30,19 @@ CREATE TABLE IF NOT EXISTS transactions (
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
+-- Create Stock Usage History Table
+CREATE TABLE IF NOT EXISTS stock_usage_history (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    recipe_name VARCHAR(255),
+    production_quantity INT,
+    product_id INT NOT NULL,
+    product_name VARCHAR(255) NOT NULL,
+    quantity_used FLOAT NOT NULL,
+    unit VARCHAR(50),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (product_id) REFERENCES products(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
 -- Create Predictions Table
 CREATE TABLE IF NOT EXISTS predictions (
     id INT AUTO_INCREMENT PRIMARY KEY,