I managed to create a module to update the product set to in stock when an import is done.

The only problem I see now is that the cache is invalidated afterwards and I also need to update the cache after reindexing the site.

This is my code for the modules app/etc/modules/Myweb_Stockin.xml

    <?xml version="1.0"?>
    <config>
        <modules>
            <Myweb_Stockin>
    			<active>true</active>
    			<codePool>local</codePool>
            </Myweb_Stockin>
        </modules>
    </config>

This is my code for the config app/code/local/Myweb/Stockin/etc/config.xml

    <?xml version="1.0"?>
    <config>
    	<modules>
    		<Myweb_Stockin>
    			<version>0.0.1</version>
    		</Myweb_Stockin>
    	</modules>
    	<adminhtml>
    		<models>
                <mywebstockin>
                    <class>Stockin_Model</class>
                </mywebstockin>
            </models>
    		<events>
    			<catalog_product_import_finish_before>
    				<observers>
    					<stockin>
    						<type>model</type>
    						<class>Myweb_Stockin_Model_Observer</class>
    						<method>product_save_after</method>
    					</stockin>
    				</observers>
    			</catalog_product_import_finish_before>
    		</events>
    	</adminhtml>
    </config>

This is my code for the observer app/code/local/Myweb/Stockin/Model/Observer.php which is from this page: https://stackoverflow.com/questions/7168295/magento-auto-changing-the-stock-availability-from-out-of-stock-to-in-stock

    <?php
    	class Myweb_Stockin_Model_Observer {
    		public function product_save_after($observer) {
    			$collection = Mage::getResourceModel('cataloginventory/stock_item_collection');
    			$outQty = Mage::getStoreConfig('cataloginventory/item/options_min_qty');
    			$collection->addFieldToFilter('qty', array('gt' => $outQty));
    			$collection->addFieldToFilter('is_in_stock', 0);
    			foreach($collection as $item) {
    				$item->setData('is_in_stock', 1);
    			}
    			$collection->save();
    		}
    	}
    ?>

I need to know if there is something wrong with this code.

I am at a loss trying to find out where the invalidated cache is coming from.