When DTO structures change over time, cached data can outlive the code that created it, causing delayed crashes when the app reads outdated cached data with mismatched field mappings; the solution is to version the decoding paths so that both old and new data structures can be handled cleanly without causing runtime errors.
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You’ve scaled apps over time. What broke when DTO structures changed without migrationthinking?Added:
Field names changed, mapping adjusted fast. Old cached data state, app read both shapes, random crashes appear. The mistake was ignoring stored DTO versions. It happened because cache outlived code. What fixed it was versioned the decoding paths. Old and new handled cleanly. I explain it in the link in the caption.
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