feat: enhance inventory management features

- Update stock movement model with improved functionality
- Enhance inventory routes and API endpoints
- Improve inventory templates for movements, reports, and stock items
- Add better history tracking and valuation reporting

app/models/stock_movement.py

@@ -13,7 +13,7 @@ class StockMovement(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     movement_type = db.Column(
         db.String(20), nullable=False, index=True
-    )  # 'adjustment', 'transfer', 'sale', 'purchase', 'return', 'waste'
+    )  # 'adjustment', 'transfer', 'sale', 'rent', 'purchase', 'return', 'waste'
     stock_item_id = db.Column(db.Integer, db.ForeignKey("stock_items.id"), nullable=False, index=True)
     warehouse_id = db.Column(db.Integer, db.ForeignKey("warehouses.id"), nullable=False, index=True)
     quantity = db.Column(db.Numeric(10, 2), nullable=False)  # Positive for additions, negative for removals
@@ -307,6 +307,12 @@ class StockMovement(db.Model):
             return
 
         # Outbound: consume FIFO (oldest first). Prefer a specific lot if provided (used after devaluation).
+        # Special case: "rent" movements keep value in stock (don't consume from lots) for accounting purposes
+        if qty < 0 and movement.movement_type == "rent":
+            # For rent, we don't consume from lots - this keeps the value in inventory
+            # while removing physical quantity from warehouse
+            return
+        
         qty_to_consume = abs(qty)
         allow_negative = movement.movement_type == "adjustment"
 

app/routes/inventory.py

@@ -1906,7 +1906,12 @@ def reports_valuation():
             stock_item_id=item_detail["item_id"], warehouse_id=item_detail["warehouse_id"]
         ).first()
         if stock:
-            items_with_value.append({"stock": stock, "value": item_detail["value"]})
+            items_with_value.append({
+                "stock": stock, 
+                "value": item_detail["value"],
+                "quantity": item_detail.get("quantity"),
+                "cost": item_detail.get("cost")
+            })
 
     return render_template(
         "inventory/reports/valuation.html",

app/templates/inventory/movements/form.html

@@ -25,6 +25,7 @@
                     <option value="adjustment">{{ _('Adjustment') }}</option>
                     <option value="transfer">{{ _('Transfer') }}</option>
                     <option value="sale">{{ _('Sale') }}</option>
+                    <option value="rent">{{ _('Rent') }}</option>
                     <option value="purchase">{{ _('Purchase') }}</option>
                     <option value="return">{{ _('Return') }}</option>
                     <option value="waste">{{ _('Waste') }}</option>

app/templates/inventory/movements/list.html

@@ -24,6 +24,7 @@
                 <option value="adjustment" {% if movement_type == 'adjustment' %}selected{% endif %}>{{ _('Adjustment') }}</option>
                 <option value="transfer" {% if movement_type == 'transfer' %}selected{% endif %}>{{ _('Transfer') }}</option>
                 <option value="sale" {% if movement_type == 'sale' %}selected{% endif %}>{{ _('Sale') }}</option>
+                <option value="rent" {% if movement_type == 'rent' %}selected{% endif %}>{{ _('Rent') }}</option>
                 <option value="purchase" {% if movement_type == 'purchase' %}selected{% endif %}>{{ _('Purchase') }}</option>
                 <option value="return" {% if movement_type == 'return' %}selected{% endif %}>{{ _('Return') }}</option>
                 <option value="waste" {% if movement_type == 'waste' %}selected{% endif %}>{{ _('Waste') }}</option>

app/templates/inventory/reports/movement_history.html

@@ -42,6 +42,7 @@
                 <option value="adjustment" {% if selected_movement_type == 'adjustment' %}selected{% endif %}>{{ _('Adjustment') }}</option>
                 <option value="transfer" {% if selected_movement_type == 'transfer' %}selected{% endif %}>{{ _('Transfer') }}</option>
                 <option value="sale" {% if selected_movement_type == 'sale' %}selected{% endif %}>{{ _('Sale') }}</option>
+                <option value="rent" {% if selected_movement_type == 'rent' %}selected{% endif %}>{{ _('Rent') }}</option>
                 <option value="purchase" {% if selected_movement_type == 'purchase' %}selected{% endif %}>{{ _('Purchase') }}</option>
                 <option value="return" {% if selected_movement_type == 'return' %}selected{% endif %}>{{ _('Return') }}</option>
                 <option value="waste" {% if selected_movement_type == 'waste' %}selected{% endif %}>{{ _('Waste') }}</option>

app/templates/inventory/reports/valuation.html

@@ -78,8 +78,8 @@
                     </td>
                     <td class="p-4 font-mono text-sm">{{ item_data.stock.stock_item.sku }}</td>
                     <td class="p-4">{{ item_data.stock.stock_item.category or '—' }}</td>
-                    <td class="p-4">{{ item_data.stock.quantity_on_hand }}</td>
-                    <td class="p-4">{{ "%.2f"|format(item_data.stock.stock_item.default_cost or 0) }} EUR</td>
+                    <td class="p-4">{{ "%.2f"|format(item_data.quantity) if item_data.quantity is not none else item_data.stock.quantity_on_hand }}</td>
+                    <td class="p-4">{{ "%.2f"|format(item_data.cost) if item_data.cost is not none else (item_data.stock.stock_item.default_cost or 0) }} EUR</td>
                     <td class="p-4 font-semibold">{{ "%.2f"|format(item_data.value) }} EUR</td>
                 </tr>
                 {% else %}

app/templates/inventory/stock_items/history.html

@@ -34,6 +34,7 @@
                 <option value="adjustment" {% if selected_movement_type == 'adjustment' %}selected{% endif %}>{{ _('Adjustment') }}</option>
                 <option value="transfer" {% if selected_movement_type == 'transfer' %}selected{% endif %}>{{ _('Transfer') }}</option>
                 <option value="sale" {% if selected_movement_type == 'sale' %}selected{% endif %}>{{ _('Sale') }}</option>
+                <option value="rent" {% if selected_movement_type == 'rent' %}selected{% endif %}>{{ _('Rent') }}</option>
                 <option value="purchase" {% if selected_movement_type == 'purchase' %}selected{% endif %}>{{ _('Purchase') }}</option>
                 <option value="return" {% if selected_movement_type == 'return' %}selected{% endif %}>{{ _('Return') }}</option>
                 <option value="waste" {% if selected_movement_type == 'waste' %}selected{% endif %}>{{ _('Waste') }}</option>