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a62ab824e6
schema_extension allows making invisible changes to system_schema that evade upgrade rollback tests. They appear in system_schema as an encoded blob which reduces serviceability, as they cannot be read. Deprecate it and point users to adding explicit columns in scylla_tables. We could probably make use of the data structure, after we teach it to encode its payload into proper named and typed columns instead of using IDL. Closes scylladb/scylladb#23151