Hi, I have developed an app for this use case Inventory History Guardian allows you to track inventory adjustments, store them for more than 90 days, add notes and export them, whilst still using Shopify’s native Inventory so you don’t get out of sync. You can then see all of your adjustments across your store in one table and export it to CSV.
It’s still new so it would be great if you would check it out and let me know what you think and if it meets your needs
https://apps.shopify.com/inventory-history-guardian
Thanks