Pls help me found all request 's lost after import workorder

Pls help me found all request 's lost after import workorder

Pls help me about found all request 's lost after import workorder
- I export workorder to xls file for repair field "timespent" and then I deleted all record and import in same Table "workorder" after that I look in ServiceDesk and can't see all request, i don't know what's wrong? and i look in mysql then have data in this table(workoder), Pls Help me

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