Remember the Schema-Drift Warning Signs
Recall practical signs that a spreadsheet automation source contract has drifted.
What is schema drift? A source structure changes after automation was built. Column renamed, removed, reordered, added, or type-changed; file naming and sheet names can drift too. Stable reference Structured reference or cell coordinate? Tables and named fields are easier to validate than coordinates. Common request The export owner says column names may change without notice. Your line Then the workbook needs a required-field check and an exception message before outputs refresh. Accepting unpredictable source changes without a stop rule. It makes source instability visible before bad numbers ship. DRIFT What does DRIFT remind you to inspect?
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