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In case you're using PHP-MySQL Bridge to work with your store database, you'll find the data that hasn't been posted to your store yet in "Pending (Bridge) Data".
You can check logs of the changes you've made since last time you've posted changes to the live store.
On the "Edit Pending Data" page you can make changes to the future data modifications. So when you post data, it will be posted with the changes you've made.
Please note that any modifications done using the "Pending Data" section won't be displayed at your current (local) database till the time you get data from the web again.