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Invoice system migration ate 3 full weeks of my life

Switched us from spreadsheets to a new billing platform last month. Thought it would take a weekend. Imported 400 customer records and suddenly all the payment terms were wrong. Every single invoice needed manual review. Spent 3 weeks fixing data that was supposedly clean. Has anyone else dealt with a migration where the old system's data was way messier than expected?
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elizabeth_king
Stop blaming the old system, you skipped validating the data before importing it.
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