Fixing bugs in Event Sourcing is hard, for real?
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When bugs corrupt data in state-based systems, each corrective migration overwrites the evidence needed to verify the fix, creating a chain of cascading repairs. Event sourcing preserves the original inputs alongside every change, making it possible to identify exactly which events a broken build produced (via buildSha metadata), calculate correct values without reconstruction, and append corrective events rather than rewriting history. A practical hotel reservation scenario illustrates how to detect already-handled corrections, avoid overwriting deliberate manual adjustments, and treat data correction as a first-class domain operation built before incidents occur.
