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* fix: change postal_code column from integer to string Allows non-numeric postal codes such as UK format (e.g. SW1A 2AA). The integer column was silently dropping any alphanumeric input. The migration is marked irreversible — once alphanumeric postal codes exist, they cannot be safely cast back to integer. * fix: update schema.rb, quote fixture postal_code, and add alphanumeric test * fix: use conventional migration timestamp