data integrity checks

https://future-wiki.win/index.php/Why_End-to-End_Testing_Is_the_Safety_Net_Your_Web_App_Needs

Data integrity checks are like those routine health screenings for your data—catching inconsistencies or corruption before they cause bigger problems. I usually run them after importing a large dataset or before a critical analysis, making sure row counts match, values fall within expected ranges, and no duplicates slipped in. It's a dull but essential step that saves me from embarrassing errors later.