i would like to suggest having batch delete option for all tabs.
this would be helpful for users in many ways. following are what came up in my mind.
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when a business would like to start fresh for a new financial year, they can just create a copy of the business file, import it and delete all the transactions. this would help keep all their settings and COA.
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most tabs which do not affect the financial status of a business can be cleared of old junk every financial year. an example would be the sales quote tab.