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Gate fuzz oracles on documented SQLite3MC findings - #28
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ClusterFuzzLite batch fuzzing has failed every day because the backup and shared_cache oracles fire on known SQLite3MC defects.
The backup oracle now asserts only for pairs laid out identically, since sqlite3mcIsBackupSupported still lets pairs with different reserved bytes through. It also exempts a destination whose page 1 is encrypted whole and whose pages are below 4096 bytes, which SQLite3MC cannot reopen at all because mcIoRead skips decryption on a short read. That one is a new finding, not yet reported upstream.
shared_cache now keys siblings either like main or with their own configuration, asserts main's reads only when every sibling keys like main, and skips the file check once a sibling writes after another sibling replaced the shared codec (utelle/SQLite3MultipleCiphers#281, closed as not planned). Its pre-created table now matches the workload schema, which fixes a harness bug where Index ops failed on a missing column. With the oracle fixed, the shared_cache seed generator keeps six more seeds.