diff --git a/backend/services/falukantService.js b/backend/services/falukantService.js
index 790d52d..6cb1a7f 100644
--- a/backend/services/falukantService.js
+++ b/backend/services/falukantService.js
@@ -1547,46 +1547,62 @@ class FalukantService extends BaseService {
     }
 
     async getInventory(hashedUserId, branchId) {
+        // PERFORMANCE: Diese Route war langsam wegen doppelter/verschachtelter Includes (Branch->Stocks->Region + Inventory->Stock->Branch->Region).
+        // Wir holen stattdessen genau die benötigten Felder in EINER aggregierenden SQL-Query.
         const u = await getFalukantUserOrFail(hashedUserId);
-        const f = branchId ? { id: branchId, falukantUserId: u.id } : { falukantUserId: u.id };
-        const br = await Branch.findAll({
-            where: f,
-            include: [
-                { model: FalukantStock, as: 'stocks', include: [{ model: FalukantStockType, as: 'stockType' }] },
-                { model: RegionData, as: 'region', include: [{ model: RegionType, as: 'regionType' }] }
-            ]
-        });
-        const stockIds = br.flatMap(b => b.stocks.map(s => s.id));
-        const inv = await Inventory.findAll({
-            where: { stockId: stockIds },
-            include: [
-                {
-                    model: FalukantStock,
-                    as: 'stock',
-                    include: [
-                        {
-                            model: Branch,
-                            as: 'branch',
-                            include: [{ model: RegionData, as: 'region', include: [{ model: RegionType, as: 'regionType' }] }]
-                        },
-                        { model: FalukantStockType, as: 'stockType' }
-                    ]
-                },
-                { model: ProductType, as: 'productType' }
-            ]
-        });
-        const grouped = inv.reduce((acc, i) => {
-            const r = i.stock.branch.region;
-            const k = `${r.id}-${i.productType.id}-${i.quality}`;
-            acc[k] = acc[k] || { region: r, product: i.productType, quality: i.quality, totalQuantity: 0 };
-            acc[k].totalQuantity += i.quantity;
-            return acc;
-        }, {});
-        return Object.values(grouped).sort((a, b) => {
-            if (a.region.id !== b.region.id) return a.region.id - b.region.id;
-            if (a.product.id !== b.product.id) return a.product.id - b.product.id;
-            return a.quality - b.quality;
-        });
+        const branchIdInt = branchId == null ? null : parseInt(branchId, 10);
+        if (branchId != null && Number.isNaN(branchIdInt)) {
+            throw new Error('Invalid branchId');
+        }
+
+        const rows = await sequelize.query(
+            `
+            SELECT
+              r.id        AS region_id,
+              r.name      AS region_name,
+              rt.id       AS region_type_id,
+              rt.label_tr AS region_type_label_tr,
+              p.id        AS product_id,
+              p.label_tr  AS product_label_tr,
+              p.sell_cost AS product_sell_cost,
+              i.quality   AS quality,
+              SUM(i.quantity)::int AS total_quantity
+            FROM falukant_data.inventory i
+            JOIN falukant_data.stock s ON s.id = i.stock_id
+            JOIN falukant_data.branch b ON b.id = s.branch_id
+            JOIN falukant_data.region r ON r.id = b.region_id
+            LEFT JOIN falukant_type.region rt ON rt.id = r.region_type_id
+            JOIN falukant_type.product p ON p.id = i.product_id
+            WHERE b.falukant_user_id = :falukantUserId
+              AND (:branchId::int IS NULL OR b.id = :branchId::int)
+            GROUP BY
+              r.id, r.name, rt.id, rt.label_tr,
+              p.id, p.label_tr, p.sell_cost,
+              i.quality
+            ORDER BY r.id, p.id, i.quality
+            `,
+            {
+                replacements: { falukantUserId: u.id, branchId: branchIdInt },
+                type: sequelize.QueryTypes.SELECT
+            }
+        );
+
+        return (rows || []).map(r => ({
+            region: {
+                id: r.region_id,
+                name: r.region_name,
+                regionType: r.region_type_id
+                    ? { id: r.region_type_id, labelTr: r.region_type_label_tr }
+                    : null
+            },
+            product: {
+                id: r.product_id,
+                labelTr: r.product_label_tr,
+                sellCost: r.product_sell_cost
+            },
+            quality: r.quality,
+            totalQuantity: r.total_quantity
+        }));
     }
 
     async sellProduct(hashedUserId, branchId, productId, quality, quantity) {