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Adds atomic configuration reload capability for DNS zones and records.
Key changes:
replace()
method for bothDNSStore
andDNSZone
classes to atomically update configurationsDNSZone
constructor to accept initial records_is_valid_record
tocheck_record
for better clarityMapping
type for better zone name uniquenessAll changes covered by comprehensive test suite including edge cases like empty replacements and invalid records.
The main goal is to support safe configuration reloads from external sources (files, databases, etc.) while maintaining data consistency.